San Antonio, Texas Records and Averages

       The city of San Antonio is located in the south–central portion of Texas on the Balcones escarpment. Temperatures range from 50 degrees in January to the middle 80s in July and August. While the summer is hot with daily temperatures above 90 degrees over 80 percent of the time, extremely high temperatures are rare. Mild weather prevails during much of the winter months, with below–freezing temperatures occurring on an average of about 20 days each year. 

Precipitation is fairly well-distributed throughout the year, with the heaviest amounts occurring during May and September. Precipitation from April through September usually occurs from thunderstorms and heavy precipitation may fall during short periods of time. Most of winter precipitation occurs as light rain or drizzle. Thunderstorms and heavy rains have occurred in all months of the year. Hail of damaging intensity seldom occurs, but small hail is frequent with the springtime thunderstorms. Measurable snow occurs only once in three or four years. Snowfall of 2 to 4 inches occurs about every ten years.

Temperature + Precipitation 

  Monthly Averages Daily Extremes Monthly Extremes
Temperatures
 in F
Max. Min. Avg High Date of 
daily extreme
 high
Low Date of
daily extreme
low
Highest
Avg
Year Lowest
Avg
Year
January 62.2 39.8 51.0 89 30/1971 0 31/1949 59.4 1952 43.3 1978
February 66.5 43.3 54.9 100 21/1996 6 02/1951 62.9 2009 46.4 1978
March 73.5 50.2 61.9 100 28/1971 19 02/1980 67.9 1974 54.9 1969
April 80.4 58.4 69.4 101 19/1996 31 03/1987 76.7 2006 63.9 1997
May 86.4 66.2 76.3 104 31/2004 43 09/1984 81.9 1996 71.3 1976
June 92.1 72.3 82.2 107 15/1998 53 02/1964 87.4 1990 78.8 1966
July 94.8 74.4 84.6 106 26/1954 62 16/1967 88.7 2009 79.8 1976
August 95.3 74.1 84.7 108 19/1986 61 25/1966 88.3 2009 81.1 1974
September 89.8 69.2 79.5 105 25/2005 46 19/1981 84.3 2005 72.3 1974
October 82.0 59.7 70.9 99 12/1991 27 31/1993 76.9 2004 61.0 1976
November 71.5 48.9 60.2 94 04/1988 21 29/1976 65.7 1973 52.1 1976
December 64.5 41.6 53.1 90 25/1955 6 23/1989 60.1 1970 43.0 1983
                     
Annual 79.9 58.2 69.1 108 1986/08/19 0 1949/01/31 72.1 2006 66.4 1976
Winter 64.4 41.6 53.0 100 1996/02/21 0 1949/01/31 57.8 1971 47.7 1978
Spring 80.1 58.3 69.2 104 2004/05/31 19 1980/03/02 74.3 2006 65.8 1969
Summer 94.1 73.6 83.8 108 1986/08/19 53 1964/06/02 87.8 2009 80.4 1976
Fall 81.1 59.3 70.2 105 2005/09/25 21 1976/11/29 73.4 2005 63.5 1976

Precipitation

    Total Snowfall
  Avg. High Year Low Year 1 Day Max. >=
0.01 in.
>=
0.10 in.
>=
0.50 in.
>=
1.00 in.
Mean High Year
  in. in. - in. - in. dd/yyyy
or
yyyymmdd
# Days # Days # Days # Days in. in. -
January 1.64 8.52 1968 0.00 1996 2.72 18/1968 8 3 1 0 0.4 15.9 1985
February 1.81 6.43 1965 0.01 1999 2.44 03/1986 7 4 1 0 0.2 3.5 1966
March 1.78 7.24 2007 0.03 1954 2.50 03/1992 8 3 1 1 0.0 0.0 -
April 2.48 9.32 1957 0.01 2005 3.60 26/1990 7 4 2 1 0.0 0.0 -
May 3.73 12.85 1987 0.12 2003 6.26 05/1993 8 5 2 1 0.0 0.0 -
June 3.56 11.95 1986 0.01 1967 6.18 03/1951 7 4 2 1 0.0 0.0 -
July 2.30 16.92 2002 0.00 1984 9.52 01/2002 5 3 1 1 0.0 0.0 -
August 2.52 11.14 1974 0.00 1952 5.73 16/2007 5 3 2 1 0.0 0.0 -
September 3.46 15.78 1946 0.05 1999 6.54 26/1973 7 5 2 1 0.0 0.0 -
October 3.46 18.07 1998 0.00 1952 11.26 17/1998 7 4 2 1 0.0 0.0 -
November 2.22 9.46 2004 0.00 1966 4.87 01/1977 7 3 1 1 0.0 0.3 1957
December 1.65 13.96 1991 0.03 1950 5.97 19/1991 7 3 1 0 0.0 0.2 1964
 
Annual 30.62 52.28 1973 13.70 1954 11.26 1998/10/17 82 45 18 9 0.6 15.9 1985
 
Winter 5.11 25.97 1992 0.44 1999 5.97 1991/12/19 22 10 3 1 0.6 15.9 1985
Spring 7.99 21.73 1957 0.52 1961 6.26 1993/05/05 23 12 5 2 - -  
Summer 8.38 25.00 2007 1.38 2009 9.52 2002/07/01 17 11 5 3 - -  
Fall 9.15 23.04 1998 0.73 2008 11.26 1998/10/17 20 12 5 3

-

0.3 1957
Texas averages and extremes in precipitation and temperature and Top 10 U.S climate extremes.
Winter = Dec, Jan, and Feb Spring = Mar, Apr, and May
Summer = Jun, Jul, and Aug. Fall = Sep, Oct, and Nov
Data period is 1946 - 2010, Source: Western Regional Climate Center