Rockwall, TX climate
Rockwall has mild winters and hot summers. A typical July afternoon reaches 94°, a January night drops to 35°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Rockwall feels like
Winter
Spring
Summer
Fall
Rockwall weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 55° | 35° | 2.8" | 0.1" | 8 | 0 | 41° – 53° |
| February | 60° | 39° | 2.9" | 0.1" | 8 | 0 | 41° – 58° |
| March | 67° | 47° | 3.8" | 0 | 9 | 0 | 52° – 63° |
| April | 75° | 53° | 3.5" | 0 | 7 | 0 | 60° – 70° |
| May | 82° | 62° | 4.7" | 0 | 9 | 0 | 68° – 78° |
| June | 90° | 70° | 3.9" | 0 | 8 | 0 | 77° – 85° |
| July | 94° | 74° | 2.1" | 0 | 5 | 0 | 80° – 89° |
| August | 95° | 73° | 2.3" | 0 | 5 | 0 | 78° – 91° |
| September | 88° | 66° | 3.0" | 0 | 5 | 0 | 73° – 84° |
| October | 78° | 55° | 4.7" | 0 | 7 | 0 | 62° – 72° |
| November | 66° | 45° | 3.2" | 0 | 7 | 0 | 49° – 61° |
| December | 57° | 37° | 3.4" | 0 | 8 | 0 | 39° – 52° |
| Year | 76° | 55° | 40.3" | 0.2" | 85 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Rockwall
Rockwall gets 40 inches of rain and melted snow a year. May is the wettest month and July the driest. Rain or snow falls on about 85 days a year.
About 254 frost-free days a year
In half of years the last 32° night comes by March 10 and the first one by November 19. That leaves about 254 frost-free days for gardens, longer than 91% of U.S. towns.
Heating and cooling a home in Rockwall
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Rockwall, 53% of that work is heating and 47% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Rockwall and its neighbors
Rockwall borders 3 towns with climate data. January nights across them vary by 0.8°. Heath has the coldest January nights (35°) and Dallas the hottest July afternoons (95°). Rockwall’s January low is 35° and its July high 94°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Rockwall compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Rockwall averaged 0.9° warmer than the 1900s. The biggest change is in January (+2.0°). The shift is smaller than in 81% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Rockwall’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 41° to 58°. June is the most reliable, staying within 8°.
Common questions about Rockwall’s climate
What is the coldest month in Rockwall?
January, with a typical high of 55° and a low of 35°.
What is the hottest month in Rockwall?
August, with a typical high of 95° and a low of 73°. About 95 days a year reach 90°.
How much snow does Rockwall get?
Almost none. A normal year brings 0.2 inches.
When is the first frost in Rockwall?
In half of years the first 32° night comes by November 19, and the last spring frost by March 10.
What is the rainiest month in Rockwall?
May, with 4.7 inches of rain and melted snow. The year totals 40 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Rockwall itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Rockwall, TX (2 mi, snow) and Lavon Dam, TX (9 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.