San Angelo:
Average annual number of 100 degree days (1981-2010): 18.2 days*
*Keep in mind that 2011 is not in the time period for the official normals.
Record annual and consecutive days with high temperatures of 100 degress or greater
Period of record 1907-present
| Rank | Greatest Annual Number of Days (Year) |
Most Consecutive Days and Dates (1907 - present) |
| 1 | 100 (2011) | 28 (July 2 - July 29, 2011) |
| 2 | 60 (1969) | 27 (July 7 - August 2, 1912) |
| 3 | 59 (1924)* | 26 (July 30 - August 24, 2010) |
| 4 | 56 (2012) | 24 (July 28 - August 20, 2019) |
| 5 | 55 (1917)* | 18 (June 18 - July 5, 1969) |
| 55 (1910)* | 18 (July 30 - August 17, 1943) | |
| 7 | 52 (1960) | 17 (August 15 - August 31, 2011) |
| 52 (1912)* | 17 (June 12 - June 28, 1911) | |
| 52 (1911)* | 16 (July 14 - July 29, 2018) | |
| 10 | 49 (1962) | 16 (July 28- August 12, 2012) # |
* Denotes missing data
# Sixteen consecutive days was also matched in 2011, 1929 and 1917
Years when Maximum Temperature did not reach 100 degrees:
1950
1976
2007
Earliest and Latest Dates of Occurrence:
Average calendar date of the first 100-degree high (1981-2010): June 5
Earliest calendar date (on record) of the first 100-degree high: April 6, 1972
Latest calendar date (on record) of the first 100-degree high (in years where 100-degree temperatures occurred): August 15, 1997
Latest calendar date (on record) of the last 100-degree high: October 13, 1926
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