Rockwall climate — normals and trends
Rockwall (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 18.3 °C and it receives 1,002 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (28.9 °C on average) and the coldest is January (6.8 °C). Rainfall peaks in May.
Rockwall averages 27 frost days, 108 hot days (≥ 30 °C) and 94 rainy days per year.
Rockwall has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 31 to 23 per year over the period.
The hottest day of the period reached 42.2 °C (on 25 August 2023) and the coldest -18.8 °C (on 23 December 1989).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
RockwallTexas
- coords
- 32.93°, -96.46°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.3°C
Average daily high
23.6°C
Average daily low
13.5°C
Annual rainfall
1,002mm
Sunshine / day
9.4h
Mean relative humidity
67%
Average peak wind
20.7km/h
Seasonal range
22.1°C
Frost days (< 0 °C)
27 d/yr
Hot days (≥ 30 °C)
108 d/yr
Rainy days (≥ 1 mm)
94 d/yr
Annual snowfall
5.5 cm
Average feels-like high
23.4 °C
Average feels-like low
12.2 °C
Average peak gust
37.6 km/h
Tropical nights (≥ 20 °C)
117 d/yr
Solar radiation
17.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.40 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
42.2 °C
25 August 2023
Coldest day
-18.8 °C
23 December 1989
Wettest day
135 mm
30 August 1944
Windiest day
52.4 km/h
14 December 1971
Strongest gust
102.2 km/h
12 September 1961
Hottest feels-like
45.3 °C
3 August 2011
Coldest feels-like
-24.5 °C
23 December 1989
Snowiest day
14.4 cm
1 March 1942
Sunniest day
13.6 h
10 June 2020
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 11.0 °C | -1.3 °C | 116 mm | +52 mm |
| Feb | 15.1 °C | +0.5 °C | 52 mm | -22 mm |
| Mar | 23.2 °C | +4.3 °C | 86 mm | -12 mm |
| Apr | 24.9 °C | +1.5 °C | 152 mm | +26 mm |
| May | 27.6 °C | +0.4 °C | 122 mm | -23 mm |
| Jun | 31.5 °C | +0.1 °C | 97 mm | +17 mm |
| Jul | 33.9 °C | +0.1 °C | 58 mm | +12 mm |
| Aug | 33.8 °C | -0.3 °C | 50 mm | +4 mm |
| Sep | 32.2 °C | +1.8 °C | 21 mm | -48 mm |
| Oct | 28.2 °C | +3.1 °C | 83 mm | -9 mm |
| Nov | 22.3 °C | +3.8 °C | 133 mm | +44 mm |
| Dec | 16.7 °C | +2.8 °C | 11 mm | -62 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Rockwall?
Rockwall has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 18.3 °C and it receives 1,002 mm of precipitation per year.
What is the hottest day ever recorded in Rockwall?
The hottest day measured in Rockwall between 1940 and 2025 was 25 August 2023, reaching 42.2 °C.
What is the coldest day in Rockwall?
The coldest day measured in Rockwall between 1940 and 2025 was 23 December 1989, at -18.8 °C.
Does it snow in Rockwall?
Yes. Rockwall gets on average 5.5 cm of snow per year and has around 27 frost days.
Has the climate of Rockwall warmed?
Yes: Rockwall warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rockwall?
The wettest day measured in Rockwall between 1940 and 2025 was 30 August 1944, with 135 mm of rain in 24 hours.
What was the windiest day in Rockwall?
The windiest day measured in Rockwall between 1940 and 2025 was 14 December 1971, with winds reaching 52.4 km/h.
What is the warmest month in Rockwall?
The warmest month in Rockwall is August (28.9 °C on average); the coldest is January (6.8 °C).
How much does it rain in Rockwall?
Rockwall receives on average 1,002 mm of precipitation per year, spread over about 94 rainy days.
Is it sunny in Rockwall?
Rockwall gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.
What is the biggest single-day snowfall in Rockwall?
The heaviest 24-hour snowfall measured in Rockwall between 1940 and 2025 was 1 March 1942, with 14.4 cm.
Are there tropical nights in Rockwall?
Yes: Rockwall has on average 117 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Rockwall?
In Rockwall, between 1940 and 2025, the highest apparent temperature reached 45.3 °C on 3 August 2011, and the lowest was -24.5 °C on 23 December 1989.
Compare Rockwall with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Rockwall