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Austin Climate Data

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Natalie Ward

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UTSoA - Meadows Fellowship Seminar

Austin Climate Data

Natalie Ward

Basic Information

Latitude: +30.26694 (30°16’00.984”N)

Longitude: -97.74278 (97°44’34.008”W)

Time zone: UTC-6 hours

Country: Texas, United States

Continent: Americas

Sub-region: Northern America

Altitude: ~170 m (560 ft)

Climate Region

Austin is located in central Texas, on the border between a sub-tropical humid climate and a sub-tropical subhumid climate, as seen in Figure 02. Both climates are noted to have warm summers, while the sub-tropical subhumid climate also is noted to have dry winters. Within Texas, the variety of climate types is due to mountain ranges to the west, proximity to the Gulf of Mexico and the southern Great Plains, low latitudes, and shifts of elevation from high plains and mountains to the coastal plains. Due to the proximity to the Gulf of Mexico and terrain, Texas is inflicted with a lot of severe weather including hurricanes and cyclones. The shift of climate regions is apparent not only in the climate types, but also is evident in the correlating patterns reflected in related maps such as the precipitation map of Texas.1

Fig. 01 Austin location within Texas


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Precipitation

Due to Austin’s climate region, it reflects a moderate level of precipitation annually. As illustrated in Figure 3, the average annual precipitation values for Austin range from 32 to 36 inches per year. This is much lower to other cities such as New Orleans which get an average of 61.9 inches per year.2 In Figure 4, average monthly precipitation is charted, reflecting that there are two peaks that occur in April and September. These two months not only contain the highest average monthly precipitation levels, but also contain the highest daily record levels with values of 10 and 15 inches respectively. Although the average monthly and daily record charts are not identical curves, there is a strong correlation between months of high precipitation and steeper daily amounts of precipitation, as seen in the two charts of Figure 4.

Temperature

As a whole, Texas is known for warm weather. However, many parts of the state have more moderate winters that are dry rather than humid. Since Austin lies on the border between two climate zones, it has portions of the year which are extremely humid and others that are less humid. The average monthly temperatures seen in Figure 4 show a range of only 40 degrees between the lowest and highest months. However, the records high and low temperatures reflect extremes as low as -2°F in January and as high as 112°F in September. In addition to the extreme temperatures, one needs to factor in the humidity, which if high can begin to sway the human

Fig. 02 Regions of climate classification in Texas

Fig. 03 Annual precipitation (inches) in Texas from 1951 to 1980

0-1010-1212-1414-1616-1818-2020-2222-2424-2626-2828-3030-3232-3434-3636-3838-4040-4242-4444-4646-4848-5050-5252-5454-5656-5858-60

Austin Climate Data

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Fig. 04 Average temperature and precipitation for Austin, TX. (Data taken at Camp Mabry, see Appendix A)

January February March April May June July August September October November DecemberRecord High 90 99 98 99 104 108 109 110 112 100 91 90Year 1971 1996 1971 2006 1925 1998 1954 2003 2000 1938 2006 1955Record Low -2 -1 18 30 40 51 57 58 41 30 20 4Year 1949 1899 1948 1926 1925 1926 1924 1915 1942 1993 1976 1989Record Precipitation 4.41 3.05 3.26 10.00 6.16 5.81 8.56 5.68 15.00 7.39 7.55 6.34Year 1991 1958 2006 1915 1929 1941 1919 1994 1921 1923 2001 1913

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January February March April May June July August September October November DecemberAverage High 59.6 62.3 68.4 75.9 80.6 87.4 89.5 89.1 84.4 77.0 68.2 65.5

Average Low 36.6 42.3 51.4 59.2 66.9 71.4 78.6 77.9 70.3 60.3 46.0 40.9

Average Precipitation 9.21 9.41 7.54 19.82 14.10 14.96 12.80 10.88 20.78 12.63 14.10 16.14

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Fig. 06 Austin wind roses annually from 1984 to 1992

Fig. 06 Sun path diagram

Fig. 05 Sun rise and sun set times

perception of temperatures to higher extremes in the summer and cooler extremes in the winter.

Solar

Located at 30°N latitude, Austin resides in a part of the country that receives a large amount of sunlight. As seen in Figure 5, on average Austin maintains 15 hours of daytime in the summer and 11 hours of daytime in the winter. Since Austin lacks heavy cloud cover, there is a range of 50-75% of available sunlight throughout the year. This range is extremely important when considering methods such as solar energy, since the solar benefit has a lot of potential. Likewise, the large quantity of sun affects building designs due to possibilities of extreme solar heat gain and glare issues from large amounts of sunlight. All of these issues can be incorporated into building design to allow for optimization of the solar impact in Austin.

Wind

Within Austin, there is wind that is dominant on the North and South Axis, with some variety to the East. Overall, Austin mainly contains wind under 21 knots (35.4 f/s), with the majority of the winds ranging from 7 to 10 knots (11.8 f/s - 16.8 f/s). As a comparison, Chicago has an overall average of 9.25 knots (15.6 f/s) annually while Austin averages at 7.7 knots (13 f/s).3 In addition to the varying average wind speeds, Chicago allows for greater wind speeds than Austin while also creating larger percentages of time at these higher wind speeds. In addition to these factors, it also has a larger variety of wind directions than

Austin Climate Data

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Fig. 08 Austin annual wind roses

Fig. 07 Possible sunshine hours

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January February March April May June July August September October November DecemberPercentage of Available Hours 49 51 55 54 56 69 75 74 66 64 54 59

Austin, possibly due to the proximity to Lake Michigan and the varied built environment and terrain.

Austin Zero Energy Homes

In 2006, a bill was passed in Austin to propose Zero Energy Capable Homes Initiative. This type of home is defined as one that is “energy-efficient enough to be net zero energy homes with the addition of on-site or its equivalent, energy generation.”5 Within the bill, it devises a slow shift in codes throughout the years leading up to 2015 that will result in all new single-family home designs to be zero energy by 2015. This will result in increased energy efficiencies from today’s standards and allow for large reductions in energy bills for residents. With an assumption of 6,400 homes being built in Austin in the next year, there would be a carbon reduction from these homes amounting to 178,477 acres of forest or removing 22,814 cars from the road.4 In Figure 10, the chart defines various factors which are incorporated into the design of the zero energy homes, including temperature values and specific U-values and R-Factors to be used as minimum values for specific elements in the design process.


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Fig. 10 Zero Energy design guidelines

Fig. 09 Solar energy and surface meteorology

CALDWELL 2.2 HARRIS 2.2 MAVERICK 2.1 WALLER 2.2CALHOUN 2.1 HAYS 2.2 MCLENNAN 2.2 WASHINGTON 2.2CAMERON 2.1 HIDALGO 2.1 MCMULLEN 2.1 WEBB 2.1CHAMBERS 2.2 HILL 2.2 MEDINA 2.2 WHARTON 2.1CHEROKEE 2.2 HOUSTON 2.2 MILAM 2.2 WILLACY 2.1COLORADO 2.2 JACKSON 2.1 MONTGOMERY 2.2 WILLIAMSON 2.2COMAL 2.2 JASPER 2.2 NEWTON 2.2 WILSON 2.2CORYELL 2.2 JEFFERSON 2.2 NUECES 2.1 ZAPATA 2.1

302.2 Exterior Design Conditions. The design parameters in Table 302.2 shall be used for calculations under this code.

TABLE 302.2 CONDITION VALUEWintera, Design Dry-bulb (oF) 28 Summera, Design Dry-bulb (oF) 99 Summera, Design Wet-bulb (oF) 74 Degree days heatingb 1735 Degree days coolingb 2862 Climate Zonec 2.2 For SI: deg C=[(deg F)-32]/1.8.

a The outdoor design temperature shall be selected from the columns of 0.4 percent values for winter and 0.4 percent values for summer from tables in the Handbook of Fundamentals published by ASHRAE. Adjustments shall be permitted to reflect local climates, which differ from the tabulated temperatures, or local weather experience determined by the building official. b The degree-days heating (base 65OF) and cooling (base 65°F) shall be selected from the Energy Conservation Design Standards for New State Buildings, State Energy Conservation Office, State of Texas (effective June 1, 1989, as revised May 10, 1990 and February 1, 1993). c The climate zone shall be selected from Figure 302.1 of this Code.

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TABLE 402.1.1 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa

CLIMATE - SUB CLIMATE ZONE

MAXIMUM WINDOW TO WALL AREA RATIO

FENESTRATION U-FACTOR

SKYLIGHT U-FACTORb

GLAZED FENESTRATION SHGC

CEILING R-VALUE

WOOD FRAME WALL R-VALUE d

FLOOR R-VALUE

BASEMENT WALL R-VALUE

SLAB R-VALUE & DEPTHc

CRAWL SPACE WALL R-VALUE

15 0.80 0.80 0.35 19 11 11 0 0 5 20 0.75 0.75 0.35 30 13 11 0 0 5 25 0.65 0.65 0.35 30 13 11 0 0 5

2.1

30 0.51 0.51 0.35 38 13 11 0 0 5 15 0.65 0.65 0.40 30 13 11 5 0 6 20 0.55 0.55 0.40 38 13 11 6 0 6 25 0.51 0.51 0.35 38 13 19 8 0 10

2.2

30 0.46 0.46 0.35 38 16 19 8 0 10 15 0.65 0.65 0.40 30 13 19 5 0 6 20 0.55 0.55 0.40 38 13 19 6 0 6 25 0.51 0.51 0.35 38 13 19 8 0 10

3.1

30 0.46 0.46 0.35 38 16 19 8 0 10 15 0.60 0.60 0.40 30 13 19 6 0 7 20 0.51 0.51 0.40 38 13 19 6 0 7 25 0.45 0.45 0.40 38 16 19 6 0 7

3.2

30 0.40 0.40 0.35 38 16 19 6 0 7 15 0.51 0.51 0.40 30 13 19 7 0 8 20 0.45 0.45 0.40 38 13 19 7 0 8 25 0.40 0.40 0.40 38 16 19 7 0 8

3.3

30 0.40 0.40 0.40 38 19 19 7 0 8 15 0.45 0.45 NR 38 13 19 8 5, 2 ft 11 20 0.37 0.37 NR 38 13 19 8 6, 2 ft 13 25 0.37 0.37 NR 38 19 19 8 6, 2 ft 13

3.4

30 0.37 0.37 NR 38 19 30 13 6, 2 ft 20 15 0.45 0.45 NR 38 13 19 8 5, 2 ft 11 20 0.37 0.37 NR 38 13 19 8 6, 2 ft 13 25 0.37 0.37 NR 38 19 19 8 6, 2 ft 13

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30 0.37 0.37 NR 38 19 30 13 6, 2 ft 20

For SI: 1 foot = 304.8 mm. a. R-values are minimums. U-factors and SHGC are maximums. R-19 shall be permitted to be compressed into a 2 x 6

cavity. b. The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration.c. R-5 shall be added to the required slab edge R-values for heated slabs. d. The total R-value may be achieved with a combination of cavity and insulating sheathing that covers 100% of the exterior

wall. e. The wall insulation may be the sum of the two values where the first value is the cavity insulation and the second value is

insulting sheathing. The combination of cavity insulation plus insulating sheathing may be used where structural sheathing covers not more than 25% of the exterior wall area and insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25% of exterior wall area then the wall insulation requirement may only be satisfied with the single insulation value.

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TABLE 402.1.1 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa

CLIMATE - SUB CLIMATE ZONE

MAXIMUM WINDOW TO WALL AREA RATIO


SKYLIGHT U-FACTORb

GLAZED FENESTRATION SHGC

CEILING R-VALUE

WOOD FRAME WALL R-VALUE d

FLOOR R-VALUE

BASEMENT WALL R-VALUE

SLAB R-VALUE & DEPTHc

CRAWL SPACE WALL R-VALUE

15 0.80 0.80 0.35 19 11 11 0 0 5 20 0.75 0.75 0.35 30 13 11 0 0 5 25 0.65 0.65 0.35 30 13 11 0 0 5

2.1

30 0.51 0.51 0.35 38 13 11 0 0 5 15 0.65 0.65 0.40 30 13 11 5 0 6 20 0.55 0.55 0.40 38 13 11 6 0 6 25 0.51 0.51 0.35 38 13 19 8 0 10

2.2

30 0.46 0.46 0.35 38 16 19 8 0 10 15 0.65 0.65 0.40 30 13 19 5 0 6 20 0.55 0.55 0.40 38 13 19 6 0 6 25 0.51 0.51 0.35 38 13 19 8 0 10

3.1

30 0.46 0.46 0.35 38 16 19 8 0 10 15 0.60 0.60 0.40 30 13 19 6 0 7 20 0.51 0.51 0.40 38 13 19 6 0 7 25 0.45 0.45 0.40 38 16 19 6 0 7

3.2

30 0.40 0.40 0.35 38 16 19 6 0 7 15 0.51 0.51 0.40 30 13 19 7 0 8 20 0.45 0.45 0.40 38 13 19 7 0 8 25 0.40 0.40 0.40 38 16 19 7 0 8

3.3

30 0.40 0.40 0.40 38 19 19 7 0 8 15 0.45 0.45 NR 38 13 19 8 5, 2 ft 11 20 0.37 0.37 NR 38 13 19 8 6, 2 ft 13 25 0.37 0.37 NR 38 19 19 8 6, 2 ft 13

3.4

30 0.37 0.37 NR 38 19 30 13 6, 2 ft 20 15 0.45 0.45 NR 38 13 19 8 5, 2 ft 11 20 0.37 0.37 NR 38 13 19 8 6, 2 ft 13 25 0.37 0.37 NR 38 19 19 8 6, 2 ft 13

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30 0.37 0.37 NR 38 19 30 13 6, 2 ft 20

For SI: 1 foot = 304.8 mm. a. R-values are minimums. U-factors and SHGC are maximums. R-19 shall be permitted to be compressed into a 2 x 6

cavity. b. The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration.c. R-5 shall be added to the required slab edge R-values for heated slabs. d. The total R-value may be achieved with a combination of cavity and insulating sheathing that covers 100% of the exterior

wall. e. The wall insulation may be the sum of the two values where the first value is the cavity insulation and the second value is

insulting sheathing. The combination of cavity insulation plus insulating sheathing may be used where structural sheathing covers not more than 25% of the exterior wall area and insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25% of exterior wall area then the wall insulation requirement may only be satisfied with the single insulation value.

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TABLE 402.1.3 EQUIVALENT U-FACTORSa

CLIMATE - SUB

CLIMATE ZONE

MAX GLAZED AREA TO

WALL AREA RATIO

MAX GLAZED


MAX

SKYLIGHT U-FACTORb

MAX GLAZED FENESTRATION

SHGC

MIN CEILING R-VALUE

MIN WOOD FRAME WALL

R-VALUEd

MIN FLOOR

R-VALUE

MIN BASEMENT

WALL R-VALUE

15 0.80 0.75 0.055 0.086 0.069 0.360 0.135 20 0.75 0.75 0.035 0.082 0.069 0.360 0.135 25 0.65 0.75 0.035 0.082 0.069 0.360 0.135

2.1

30 0.51 0.75 0.030 0.082 0.069 0.360 0.135 15 0.65 0.75 0.035 0.082 0.069 0.122 0.106 20 0.55 0.75 0.030 0.082 0.069 0.096 0.106 25 0.51 0.75 0.030 0.082 0.047 0.087 0.075

2.2

30 0.46 0.75 0.030 0.071 0.047 0.087 0.075 15 0.65 0.65 0.035 0.082 0.069 0.122 0.106 20 0.55 0.55 0.030 0.082 0.069 0.096 0.106 25 0.51 0.51 0.030 0.082 0.047 0.087 0.075

3.1

30 0.46 0.46 0.030 0.071 0.047 0.087 0.075 15 0.60 0.65 0.035 0.082 0.047 0.096 0.101 20 0.51 0.65 0.030 0.082 0.047 0.096 0.101 25 0.45 0.65 0.030 0.071 0.047 0.096 0.101

3.2

30 0.40 0.65 0.030 0.071 0.047 0.096 0.101 15 0.51 0.65 0.035 0.082 0.047 0.092 0.096 20 0.45 0.65 0.030 0.082 0.047 0.092 0.096 25 0.40 0.65 0.030 0.071 0.047 0.092 0.096

3.3

30 0.40 0.65 0.030 0.060 0.047 0.092 0.096 15 0.45 0.60 0.030 0.082 0.047 0.087 0.075 20 0.37 0.60 0.030 0.082 0.047 0.087 0.065 25 0.37 0.60 0.030 0.060 0.047 0.087 0.065

3.4

30 0.37 0.60 0.030 0.060 0.034 0.059 0.058 15 0.45 0.60 0.030 0.082 0.047 0.087 0.075 20 0.37 0.60 0.030 0.082 0.047 0.087 0.065 25 0.37 0.60 0.030 0.060 0.047 0.087 0.065

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30 0.37 0.60 0.030 0.060 0.034 0.059 0.065

a. Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source.

402.4.4 Testing of the Building Thermal Envelope for Infiltration. Leakage of the building thermal envelope shall not exceed .50 Air Changes per Hour (ACH) as measured by the blower door test. The testing procedure shall be based on ASTM E779, Standard Test Method for Determining Air Leakage Rate by Fan Pressurization, or ANSI/ASHRAE 136, A Method of Determining Air Change Rates in Detached Dwellings. Testing shall be performed by an independent third-party technician approved by the building official. Batch testing shall be allowed per attachment 1. Documentation verifying thermal envelope air leakage equal to or less than .50 ACH shall be submitted with the final mechanical code compliance package on the jobsite and .include the following information:

a. Address of residence b. Name and company of technician performing testing

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TABLE 402.1.3 EQUIVALENT U-FACTORSa

CLIMATE - SUB

CLIMATE ZONE

MAX GLAZED AREA TO

WALL AREA RATIO

MAX GLAZED


MAX

SKYLIGHT U-FACTORb

MAX GLAZED FENESTRATION

SHGC

MIN CEILING R-VALUE

MIN WOOD FRAME WALL

R-VALUEd

MIN FLOOR

R-VALUE

MIN BASEMENT

WALL R-VALUE

15 0.80 0.75 0.055 0.086 0.069 0.360 0.135 20 0.75 0.75 0.035 0.082 0.069 0.360 0.135 25 0.65 0.75 0.035 0.082 0.069 0.360 0.135

2.1

30 0.51 0.75 0.030 0.082 0.069 0.360 0.135 15 0.65 0.75 0.035 0.082 0.069 0.122 0.106 20 0.55 0.75 0.030 0.082 0.069 0.096 0.106 25 0.51 0.75 0.030 0.082 0.047 0.087 0.075

2.2

30 0.46 0.75 0.030 0.071 0.047 0.087 0.075 15 0.65 0.65 0.035 0.082 0.069 0.122 0.106 20 0.55 0.55 0.030 0.082 0.069 0.096 0.106 25 0.51 0.51 0.030 0.082 0.047 0.087 0.075

3.1

30 0.46 0.46 0.030 0.071 0.047 0.087 0.075 15 0.60 0.65 0.035 0.082 0.047 0.096 0.101 20 0.51 0.65 0.030 0.082 0.047 0.096 0.101 25 0.45 0.65 0.030 0.071 0.047 0.096 0.101

3.2

30 0.40 0.65 0.030 0.071 0.047 0.096 0.101 15 0.51 0.65 0.035 0.082 0.047 0.092 0.096 20 0.45 0.65 0.030 0.082 0.047 0.092 0.096 25 0.40 0.65 0.030 0.071 0.047 0.092 0.096

3.3

30 0.40 0.65 0.030 0.060 0.047 0.092 0.096 15 0.45 0.60 0.030 0.082 0.047 0.087 0.075 20 0.37 0.60 0.030 0.082 0.047 0.087 0.065 25 0.37 0.60 0.030 0.060 0.047 0.087 0.065

3.4

30 0.37 0.60 0.030 0.060 0.034 0.059 0.058 15 0.45 0.60 0.030 0.082 0.047 0.087 0.075 20 0.37 0.60 0.030 0.082 0.047 0.087 0.065 25 0.37 0.60 0.030 0.060 0.047 0.087 0.065

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30 0.37 0.60 0.030 0.060 0.034 0.059 0.065

a. Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source.

402.4.4 Testing of the Building Thermal Envelope for Infiltration. Leakage of the building thermal envelope shall not exceed .50 Air Changes per Hour (ACH) as measured by the blower door test. The testing procedure shall be based on ASTM E779, Standard Test Method for Determining Air Leakage Rate by Fan Pressurization, or ANSI/ASHRAE 136, A Method of Determining Air Change Rates in Detached Dwellings. Testing shall be performed by an independent third-party technician approved by the building official. Batch testing shall be allowed per attachment 1. Documentation verifying thermal envelope air leakage equal to or less than .50 ACH shall be submitted with the final mechanical code compliance package on the jobsite and .include the following information:

a. Address of residence b. Name and company of technician performing testing

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Variable J F M A M J J A S O N DInsolation, kWh/m2/day 2.73 3.28 4.22 5.30 5.61 6.26 6.55 5.92 5.04 4.04 2.98 2.50Clearness, 0-1 0.47 0.46 0.48 0.52 0.51 0.55 0.59 0.57 0.54 0.53 0.48 0.46Temperature, °F 48.00 52.30 58.64 66.61 73.08 77.77 80.15 80.60 75.88 69.01 57.99 49.50Wind speed, mph 11.36 11.79 12.17 11.12 10.04 9.48 8.99 8.41 9.24 9.95 11.12 10.56Precipitation, in 1.72 2.42 1.87 2.74 4.50 3.52 1.67 2.04 3.53 3.44 2.24 2.10Wet days, d 7.30 6.80 7.30 6.90 9.20 6.80 4.90 5.20 7.70 6.70 7.20 7.30Relative humidity, % 70.50 69.50 69.00 71.00 76.00 74.50 71.50 70.00 72.00 71.00 72.00 71.00

Austin Climate Data

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Glossary

Subtropical Humid Climate: Characterized by hot, humid summers and cool winters.

Subtropical Subhumid Climate: Characterized by hot, humid summers and cool, dry winters.

Precipitation: Any or all of the forms of water droplets, whether liquid or solid, that fall from the atmosphere and reach the ground.

Temperature: Register of the amount of heat contained by the air at surface and is measured in degrees on the Fahrenheit temperature scale by alcohol or mercury thermometers.

Notes

1. http://www.twdb.state.tx.us/publications/reports/GroundWaterReports/LimitedPublications/LP192.pdf

2. http://www.climate-zone.com/climate/united-states/louisiana/new-orleans/

3. http://lwf.ncdc.noaa.gov/oa/climate/online/ccd/avgwind.html

4. http://www.ci.austin.tx.us/news/2007/downloads/zeh_fact_sheet.pdf

5. http://www.chicagomanualofstyle.org/tools_citationguide.html

Figures

Figure 01: http://en.wikipedia.org/wiki/Austin,_Texas

Figure 02: http://www.twdb.state.tx.us/publications/reports/GroundWaterReports/LimitedPublications/LP192.pdf

Figure 03: http://www.twdb.state.tx.us/mapping/gisdata.asp

Figure 04: http://www.srh.noaa.gov/ewx/?n=ausclidata.htm

Figure 05: http://www.gaisma.com/en/location/austin-texas.html


Figure 07: http://www.rssweather.com/climate/Texas/Austin%20City/

Figure 08: http://www.tceq.state.tx.us/assets/public/compliance/monops/air/windroses/ausall.gif


Figure 10: http://www.ci.austin.tx.us/council_meetings/wams_item_attach.cfm?recordID=7329

Appendix A: http://www.srh.noaa.gov/ewx/?n=ausclidata.htm

References

Reference 01: http://www.gaisma.com/en/location/austin-texas.html

Reference 02: http://www.rssweather.com/climate/Texas/Austin%20City/

Reference 03: http://www.srh.noaa.gov/ewx/?n=ausclidata.htm

Reference 04: http://www.tceq.state.tx.us/assets/public/compliance/monops/air/windroses/ausall.gif

Reference 05: http://www.srrb.noaa.gov/highlights/sunrise/azel.html

Reference 06: http://www.weather.gov/climate/xmacis.php?wfo=ewx


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Appendix A: Average temperature and precipitation for Austin, TX. (Data taken at Camp Mabry)

2006 1.80 0.89 7.54 2.89 5.28 3.18 0.48 0.22 3.00 3.93 1.29 4.20 34.70 20062007 6.92 0.14 5.95 2.25 7.01 5.41 9.84 2.50 3.97 1.13 1.16 0.67 46.95 20072008 0.82 0.51 2.86 3.52 1.70 0.74 0.38 2.39 0.02 2.01 0.72 0.40 16.07 20082009 0.74 1.47 3.04 2.84 1.77 1.35 0.25 0.77 6.86 2009

MONTHLY/ ANNUAL/AVERAGE PRECIPITATION AUSTIN TX (1856 - 2009)

ALL-TIME: JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL ALL-TIME:Maximum 9.21 9.41 7.54 19.82 14.10 14.96 12.80 10.88 20.78 12.63 14.10 16.14 64.68 MaximumAverage 2.07 2.34 2.32 3.25 4.33 3.07 2.14 2.23 3.45 3.23 2.51 2.47 33.36 AverageMedian 1.61 2.00 2.07 2.65 3.61 2.25 1.54 1.59 2.81 2.66 1.98 1.88 33.47 Median

Minimum 0.00 0.00 0.00 TRACETRACE 0.00 0.00 0.00 0.00 0.00 0.00 0.00 11.42 Minimum

30-YEAR 30-YEARNORMAL: JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL NORMAL: 1971-2000 1.89 1.99 2.15 2.51 5.09 3.81 1.95 2.31 2.91 3.97 2.68 2.44 33.70 1971-2000






SEASONAL Spring Summer Autumn Winter Annual SEASONAL TOTALS 9.75 8.07 9.56 6.32 33.70 TOTALS 1971-2000 1971-2000

*NOTE:DATA MAY CONTAIN MISSING/ESTIMATED VALUES

2005 54.4 55.8 60.7 67.6 74.5 83.5 85.1 85.6 84.4 70.8 64.8 52.1 69.9 2005 2006 58.6 54.6 65.7 74.9 77.2 82.7 86.1 88.5 80.2 71.7 63.9 54.8 71.6 20062007 47.5 54.5 65.5 65.7 75.5 80.9 81.0 85.0 81.3 74.0 62.9 54.7 69.0 20072008 50.4 59.4 63.3 69.7 79.7 87.4 86.6 86.2 80.6 71.0 62.7 53.5 70.9 20082009 53.5 60.9 63.8 68.8 78.4 86.6 89.5 89.1 78.2 2009

AVERAGE MONTHLY/ANNUAL TEMPERATURE AUSTIN TX (1854 - 2009)

ALL-TIME: JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL ALL-TIME:Record Hi 59.6 62.3 68.4 75.9 80.6 87.4 89.5 89.1 84.4 77.0 68.2 65.5 71.6 Record HiAverage 49.9 53.8 60.8 68.3 75.0 81.5 84.3 84.4 78.9 69.6 59.0 51.8 68.1 AverageMedian 49.9 54.3 60.8 68.1 74.7 81.6 84.4 84.5 79.2 69.9 58.9 52.4 68.1 MedianRecord Lo 36.6 42.3 51.4 59.2 66.9 71.4 78.6 77.9 70.3 60.3 46.0 40.9 64.2 Record Lo



SEASONAL Spring Summer Autumn Winter Annual SEASONALAVERAGES 68.4 83.2 69.9 52.3 68.5 AVERAGES 1971-2000 1971-2000

*NOTE:DATA MAYCONTAINMISSING/ESTIMATEDVALUES

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