Rockwall weather in December
In December, Rockwall sees average daytime highs of 57°F and overnight lows near 39°F, with 3.8 in of precipitation across 7.5 wet days and about 9.9 hours of daylight. It is the 11th-warmest and 5th-wettest month of the year here.
Highs ease over the month, from about 60°F in the first days to 55°F by the end. The sky is clear or mostly clear about 45% of the time in December, and the air most often feels dry.
Daylight stretches from about 10 hours at the start of December to 9 h 54 min by month's end. Set against the rest of the year, December is Rockwall's 7th-clearest and 7th-windiest month. For the whole year in context, see Rockwall's year-round climate.
- Daytime high
- 57°
- 11th warmest
- Overnight low
- 39°
- 2nd coldest
- Precipitation
- 3.8 in
- 7.5 wet days
- Daylight
- 9 h 48 min
- 7:27 AM – 5:17 PM
- Cloud cover
- 51%
- 7th clearest
- Wind
- 9 mph
- 7th windiest
- Solar energy
- 2.53 kWh/m²
- Travel score
- 4.4
- out of 10
Rockwall is city in and county seat of Rockwall County, Texas, United States.
- Density
- 582/km²
- people per km²
- Founded
- 1854
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Highs ease over the month, from about 60°F in the first days to 55°F by the end.
A typical December day in Rockwall reaches about 57°F in the afternoon and slips back to 39°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 43°F and 71°F. Set against its neighbours, December runs about 8°F cooler than November and about 2°F warmer than January.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 61 | 60 | 60 | 60 | 59 | 59 | 59 | 58 | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 57 | 57 | 56 | 56 | 56 | 56 | 56 | 56 | 56 | 55 | 55 | 55 | 55 | 55 | 55 | 55 |
| Avg low (°F) | 42 | 42 | 42 | 42 | 41 | 41 | 41 | 40 | 40 | 40 | 40 | 40 | 40 | 39 | 39 | 39 | 39 | 39 | 39 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 61 | 42 |
| 2 | 60 | 42 |
| 3 | 60 | 42 |
| 4 | 60 | 42 |
| 5 | 59 | 41 |
| 6 | 59 | 41 |
| 7 | 59 | 41 |
| 8 | 58 | 40 |
| 9 | 58 | 40 |
| 10 | 58 | 40 |
| 11 | 58 | 40 |
| 12 | 58 | 40 |
| 13 | 57 | 40 |
| 14 | 57 | 39 |
| 15 | 57 | 39 |
| 16 | 57 | 39 |
| 17 | 57 | 39 |
| 18 | 56 | 39 |
| 19 | 56 | 39 |
| 20 | 56 | 38 |
| 21 | 56 | 38 |
| 22 | 56 | 38 |
| 23 | 56 | 38 |
| 24 | 56 | 38 |
| 25 | 55 | 38 |
| 26 | 55 | 38 |
| 27 | 55 | 38 |
| 28 | 55 | 38 |
| 29 | 55 | 38 |
| 30 | 55 | 38 |
| 31 | 55 | 38 |
How December really feels in Rockwall
Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 11 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
The story in December is cold — wind chill drags the overnight "feels like" below the raw low.
Rockwall weather by month
How December compares with the rest of the year at a glance. December is the 11th-warmest and 5th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 56° / 37° | 2.8 | 7.2 | 0.4 | 10.1 | 4.0 |
| Feb | 60° / 41° | 3.0 | 7.8 | 0.6 | 10.8 | 5.0 |
| Mar | 67° / 48° | 4.1 | 9.5 | 0.2 | 11.7 | 6.3 |
| Apr | 74° / 56° | 4.5 | 9.1 | 0 | 12.8 | 7.1 |
| May | 82° / 65° | 5.4 | 11.3 | 0 | 13.7 | 6.0 |
| Jun | 89° / 72° | 3.4 | 8.9 | 0 | 14.1 | 4.3 |
| Jul | 93° / 76° | 1.9 | 6.2 | 0 | 14 | 3.3 |
| Aug | 93° / 75° | 2.1 | 5.6 | 0 | 13.2 | 3.4 |
| Sep | 87° / 69° | 2.7 | 6.6 | 0 | 12.2 | 5.3 |
| Oct | 77° / 57° | 4.0 | 7.9 | 0 | 11.2 | 7.4 |
| Nov | 66° / 47° | 3.7 | 7.3 | 0.1 | 10.3 | 6.5 |
| Dec | 57° / 39° | 3.8 | 7.5 | 0.2 | 9.9 | 4.4 |
Cloud cover in December
The sky is clear or mostly clear about 45% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 45%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 59 | 58 | 58 | 58 | 57 | 56 | 55 | 55 | 55 | 54 | 54 | 55 | 55 | 55 | 55 | 55 | 54 | 55 | 55 | 55 | 55 | 55 | 55 | 54 | 54 | 54 | 54 | 55 | 54 | 54 | 54 |
| Cloudier (%) | 41 | 42 | 42 | 42 | 43 | 44 | 45 | 45 | 45 | 46 | 46 | 45 | 45 | 45 | 45 | 45 | 46 | 45 | 45 | 45 | 45 | 45 | 45 | 46 | 46 | 46 | 46 | 45 | 46 | 46 | 46 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 59 | 41 |
| 2 | 58 | 42 |
| 3 | 58 | 42 |
| 4 | 58 | 42 |
| 5 | 57 | 43 |
| 6 | 56 | 44 |
| 7 | 55 | 45 |
| 8 | 55 | 45 |
| 9 | 55 | 45 |
| 10 | 54 | 46 |
| 11 | 54 | 46 |
| 12 | 55 | 45 |
| 13 | 55 | 45 |
| 14 | 55 | 45 |
| 15 | 55 | 45 |
| 16 | 55 | 45 |
| 17 | 54 | 46 |
| 18 | 55 | 45 |
| 19 | 55 | 45 |
| 20 | 55 | 45 |
| 21 | 55 | 45 |
| 22 | 55 | 45 |
| 23 | 55 | 45 |
| 24 | 54 | 46 |
| 25 | 54 | 46 |
| 26 | 54 | 46 |
| 27 | 54 | 46 |
| 28 | 55 | 45 |
| 29 | 54 | 46 |
| 30 | 54 | 46 |
| 31 | 54 | 46 |
Chance of precipitation in December
Rockwall gets around 3.8 in of rain and snow over 7.5 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 24% and peaks near 26% on the wettest days, and about 0 day brings snow.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Snow chance (%) | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 24 | 1 |
| 2 | 24 | 1 |
| 3 | 24 | 1 |
| 4 | 24 | 1 |
| 5 | 25 | 0 |
| 6 | 25 | 0 |
| 7 | 25 | 0 |
| 8 | 26 | 0 |
| 9 | 26 | 0 |
| 10 | 26 | 0 |
| 11 | 26 | 0 |
| 12 | 26 | 0 |
| 13 | 25 | 0 |
| 14 | 25 | 0 |
| 15 | 25 | 0 |
| 16 | 25 | 0 |
| 17 | 25 | 1 |
| 18 | 25 | 1 |
| 19 | 24 | 1 |
| 20 | 24 | 1 |
| 21 | 24 | 1 |
| 22 | 23 | 1 |
| 23 | 23 | 1 |
| 24 | 23 | 1 |
| 25 | 22 | 2 |
| 26 | 22 | 2 |
| 27 | 22 | 2 |
| 28 | 22 | 2 |
| 29 | 22 | 2 |
| 30 | 22 | 2 |
| 31 | 22 | 2 |
Humidity in December
Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the dry band about 92% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 88 | 88 | 88 | 89 | 89 | 90 | 90 | 90 | 91 | 91 | 91 | 93 | 93 | 93 | 93 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 92 | 92 | 92 | 92 | 92 | 92 |
| Comfortable (%) | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 |
| Humid (%) | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 88 | 7 | 5 | 0 |
| 2 | 88 | 7 | 5 | 0 |
| 3 | 88 | 7 | 5 | 0 |
| 4 | 89 | 6 | 5 | 0 |
| 5 | 89 | 6 | 5 | 0 |
| 6 | 90 | 6 | 4 | 0 |
| 7 | 90 | 6 | 4 | 0 |
| 8 | 90 | 6 | 4 | 0 |
| 9 | 91 | 6 | 3 | 0 |
| 10 | 91 | 6 | 3 | 0 |
| 11 | 91 | 6 | 3 | 0 |
| 12 | 93 | 5 | 2 | 0 |
| 13 | 93 | 5 | 2 | 0 |
| 14 | 93 | 5 | 2 | 0 |
| 15 | 93 | 5 | 2 | 0 |
| 16 | 94 | 5 | 1 | 0 |
| 17 | 94 | 5 | 1 | 0 |
| 18 | 94 | 4 | 1 | 1 |
| 19 | 94 | 4 | 1 | 1 |
| 20 | 94 | 4 | 1 | 1 |
| 21 | 94 | 4 | 1 | 1 |
| 22 | 94 | 4 | 1 | 1 |
| 23 | 94 | 4 | 1 | 1 |
| 24 | 94 | 4 | 1 | 1 |
| 25 | 94 | 4 | 1 | 1 |
| 26 | 92 | 5 | 2 | 1 |
| 27 | 92 | 5 | 2 | 1 |
| 28 | 92 | 5 | 2 | 1 |
| 29 | 92 | 5 | 2 | 1 |
| 30 | 92 | 5 | 2 | 1 |
| 31 | 92 | 5 | 2 | 1 |
Wind in December
Winds average 9 mph in December.
Across December, daily wind ranges from about 9 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 9 | light breeze |
| 2 | 9 | light breeze |
| 3 | 9 | light breeze |
| 4 | 9 | light breeze |
| 5 | 9 | light breeze |
| 6 | 9 | light breeze |
| 7 | 9 | light breeze |
| 8 | 9 | light breeze |
| 9 | 9 | light breeze |
| 10 | 9 | light breeze |
| 11 | 9 | light breeze |
| 12 | 9 | light breeze |
| 13 | 9 | light breeze |
| 14 | 9 | light breeze |
| 15 | 9 | light breeze |
| 16 | 9 | light breeze |
| 17 | 9 | light breeze |
| 18 | 9 | light breeze |
| 19 | 9 | light breeze |
| 20 | 9 | light breeze |
| 21 | 9 | light breeze |
| 22 | 9 | light breeze |
| 23 | 9 | light breeze |
| 24 | 9 | light breeze |
| 25 | 9 | light breeze |
| 26 | 9 | light breeze |
| 27 | 9 | light breeze |
| 28 | 9 | light breeze |
| 29 | 9 | light breeze |
| 30 | 9 | light breeze |
| 31 | 9 | light breeze |
Sunrise & sunset in December
Daylight runs from about 10 hours at the start of December to 9 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 6 minutes over December. Sunrise moves from 7:16 AM to 7:33 AM, and sunset from 5:15 PM to 5:25 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.0 | 10.0 | 10.0 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.9 |
| Sunrise (AM) | 7:16 | 7:17 | 7:18 | 7:18 | 7:19 | 7:20 | 7:21 | 7:21 | 7:22 | 7:23 | 7:24 | 7:24 | 7:25 | 7:26 | 7:26 | 7:27 | 7:27 | 7:28 | 7:29 | 7:29 | 7:30 | 7:30 | 7:31 | 7:31 | 7:31 | 7:32 | 7:32 | 7:32 | 7:33 | 7:33 | 7:33 |
| Sunset (PM) | 5:15 | 5:15 | 5:15 | 5:15 | 5:15 | 5:15 | 5:15 | 5:15 | 5:15 | 5:16 | 5:16 | 5:16 | 5:16 | 5:17 | 5:17 | 5:17 | 5:18 | 5:18 | 5:18 | 5:19 | 5:19 | 5:20 | 5:20 | 5:21 | 5:21 | 5:22 | 5:22 | 5:23 | 5:23 | 5:24 | 5:25 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 10.0 | 7:16 | 5:15 |
| 2 | 10.0 | 7:17 | 5:15 |
| 3 | 10.0 | 7:18 | 5:15 |
| 4 | 9.9 | 7:18 | 5:15 |
| 5 | 9.9 | 7:19 | 5:15 |
| 6 | 9.9 | 7:20 | 5:15 |
| 7 | 9.9 | 7:21 | 5:15 |
| 8 | 9.9 | 7:21 | 5:15 |
| 9 | 9.9 | 7:22 | 5:15 |
| 10 | 9.9 | 7:23 | 5:16 |
| 11 | 9.9 | 7:24 | 5:16 |
| 12 | 9.9 | 7:24 | 5:16 |
| 13 | 9.9 | 7:25 | 5:16 |
| 14 | 9.8 | 7:26 | 5:17 |
| 15 | 9.8 | 7:26 | 5:17 |
| 16 | 9.8 | 7:27 | 5:17 |
| 17 | 9.8 | 7:27 | 5:18 |
| 18 | 9.8 | 7:28 | 5:18 |
| 19 | 9.8 | 7:29 | 5:18 |
| 20 | 9.8 | 7:29 | 5:19 |
| 21 | 9.8 | 7:30 | 5:19 |
| 22 | 9.8 | 7:30 | 5:20 |
| 23 | 9.8 | 7:31 | 5:20 |
| 24 | 9.8 | 7:31 | 5:21 |
| 25 | 9.8 | 7:31 | 5:21 |
| 26 | 9.8 | 7:32 | 5:22 |
| 27 | 9.8 | 7:32 | 5:22 |
| 28 | 9.8 | 7:32 | 5:23 |
| 29 | 9.8 | 7:33 | 5:23 |
| 30 | 9.8 | 7:33 | 5:24 |
| 31 | 9.9 | 7:33 | 5:25 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 2.53 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 2.53 kWh/m² to a high of 6.77 kWh/m² in July across the year — December's 2.53 kWh/m² sits near the bottom.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 2.7 | 2.7 | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.6 | 2.6 | 2.6 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 2.7 | Moderate |
| 2 | 2.7 | Moderate |
| 3 | 2.6 | Moderate |
| 4 | 2.6 | Moderate |
| 5 | 2.6 | Moderate |
| 6 | 2.6 | Moderate |
| 7 | 2.6 | Moderate |
| 8 | 2.6 | Moderate |
| 9 | 2.5 | Moderate |
| 10 | 2.5 | Moderate |
| 11 | 2.5 | Moderate |
| 12 | 2.5 | Moderate |
| 13 | 2.5 | Moderate |
| 14 | 2.5 | Moderate |
| 15 | 2.5 | Moderate |
| 16 | 2.5 | Moderate |
| 17 | 2.5 | Moderate |
| 18 | 2.5 | Moderate |
| 19 | 2.5 | Moderate |
| 20 | 2.5 | Moderate |
| 21 | 2.5 | Moderate |
| 22 | 2.5 | Moderate |
| 23 | 2.5 | Moderate |
| 24 | 2.5 | Moderate |
| 25 | 2.5 | Moderate |
| 26 | 2.5 | Moderate |
| 27 | 2.5 | Moderate |
| 28 | 2.5 | Moderate |
| 29 | 2.6 | Moderate |
| 30 | 2.6 | Moderate |
| 31 | 2.6 | Moderate |
Hazard calendar for Rockwall
None of Rockwall's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Rockwall sits in the Atlantic hurricane belt; the season peaks August–October.
Is December a good time to visit Rockwall?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a reasonable time to visit Rockwall for sightseeing.
What to pack for Rockwall in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Rockwall sees daytime highs around 57°F and nights near 39°F. Worth packing: a warm layer. About 8 days see rain.
UV index in Rockwall in December
Clear-sky midday UV in December peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Rockwall peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 5 | 6 | 10 | 10 | 10 | 10 | 10 | 8 | 6 | 5 | 3 |
| Level | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 5 | Moderate |
| Mar | 6 | High |
| Apr | 10 | Very high |
| May | 10 | Very high |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 5 | Moderate |
| Dec | 3 | Moderate |
Air quality in Rockwall in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in Rockwall is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (October, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 8 | 8 | 10 | 11 | 14 | 16 | 19 | 15 | 11 | 8 | 8 | 8 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 8 | Good |
| Mar | 10 | Good |
| Apr | 11 | Good |
| May | 14 | Moderate |
| Jun | 16 | Moderate |
| Jul | 19 | Moderate |
| Aug | 15 | Moderate |
| Sep | 11 | Good |
| Oct | 8 | Good |
| Nov | 8 | Good |
| Dec | 8 | Good |
Where is Rockwall?
Rockwall sits at 32.9°N, 96.5°W, 591 ft above sea level, in United States. The nearest listed city is Rowlett, 6.2 mi away.
Topography around Rockwall
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Rockwall.
Within 2 miles, the terrain around Rockwall has only modest variations in elevation — a maximum elevation change of 187 ft around an average of 509 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 279 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 617 ft.
The land around Rockwall is covered by artificial surfaces (32%), grassland (25%) and water (21%) within 2 miles, grassland (41%) within 10 miles, and grassland (47%) and trees (26%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Rockwall (32.9312°, -96.4597°, elevation 591 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).