Climate averages 1991–2020
Saint George weather
in December.
A cool, fairly dry month: the coolest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Saint George: daytime highs average 9.9°C and nights cool to about 0.2°C. By daytime temperature it is the coolest month of the year.
Expect about 28 mm of rain on roughly 5 days, which makes December a fairly dry month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 40 min on an average December day.
The nearest other city in this atlas is Henderson (172 km away). In December its highs average 13.7°C, 3.8°C warmer than Saint George, with 17 mm of rain.
Among the 498 cities listed in the United States, Saint George ranks joint 264th of 498 for the warmest December highs and joint 43rd of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Saint George is 0.6°C cooler than that mean.
From December to January, average highs rise by 0.5°C to 10.4°C, and monthly rainfall rises from 28 mm to 35 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Saint George climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 10.4°C0.1°C | 0.1°C | 35 | 5.1 | 9.910 h |
| February | 12.8°C1.9°C | 1.9°C | 42 | 6.2 | 10.811 h |
| March | 17.6°C5.8°C | 5.8°C | 34 | 5.6 | 11.912 h |
| April | 22.3°C9.9°C | 9.9°C | 18 | 3.0 | 13.113 h |
| May | 28.1°C15.7°C | 15.7°C | 8.5 | 2.1 | 14.114 h |
| June | 34.2°C21.7°C | 21.7°C | 3.2 | 0.5 | 14.715 h |
| July | 36.8°C25.9°C | 25.9°C | 9.7 | 2.1 | 14.414 h |
| August | 35.6°C24.8°C | 24.8°C | 14 | 2.8 | 13.614 h |
| September | 31.2°C19.2°C | 19.2°C | 20 | 2.7 | 12.512 h |
| October | 23.8°C11.8°C | 11.8°C | 25 | 3.4 | 11.311 h |
| November | 16.1°C4.9°C | 4.9°C | 22 | 3.2 | 10.210 h |
| December, selected | 9.9°C0.2°C | 0.2°C | 28 | 4.8 | 9.710 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Henderson in DecemberUnited States · 172 kmHigh 13.7°C · Low 5.2°C · 17 mm rain
- Las Vegas in DecemberUnited States · 173 kmHigh 12.8°C · Low 3.4°C · 21 mm rain
- Paradise in DecemberUnited States · 179 kmHigh 13.2°C · Low 4.1°C · 20 mm rain
- Spring Valley in DecemberUnited States · 185 kmHigh 12.4°C · Low 2.8°C · 20 mm rain
- Enterprise in DecemberUnited States · 191 kmHigh 12.2°C · Low 3.3°C · 20 mm rain
- Flagstaff in DecemberUnited States · 274 kmHigh 5.7°C · Low -3.6°C · 41 mm rain
- Provo in DecemberUnited States · 386 kmHigh 1.5°C · Low -8.3°C · 49 mm precipitation
- Orem in DecemberUnited States · 391 kmHigh 1.5°C · Low -8.6°C · 49 mm precipitation
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Saint George) is explained once on the Saint George year overview and on the Sources, method and limits page.