Climate averages 1991–2020
Dayton weather
in December.
A cold, moderately wet month: the joint 10th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Dayton: daytime highs average 4.6°C and nights cool to about -2.3°C. By daytime temperature it is the joint 10th warmest of the 12 months.
Expect about 85 mm of rain on roughly 10 days, which makes December a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 25 min on an average December day.
The nearest other city in this atlas is Cincinnati (76 km away). In December its highs average 5.6°C, 1.0°C warmer than Dayton, with 92 mm of rain.
Among the 498 cities listed in the United States, Dayton ranks joint 372nd of 498 for the warmest December highs and joint 298th of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Dayton is 6.0°C cooler than that mean.
From December to January, average highs fall by 2.2°C to 2.3°C, and monthly rainfall falls from 85 mm to 82 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
Dayton climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.3°C-5.5°C | -5.5°C | 82 | 9.8 | 9.710 h |
| February | 4.6°C-4.1°C | -4.1°C | 70 | 9.3 | 10.711 h |
| March | 10.0°C0.4°C | 0.4°C | 100 | 11.1 | 11.912 h |
| April | 16.8°C6.4°C | 6.4°C | 116 | 12.7 | 13.213 h |
| May | 22.0°C12.3°C | 12.3°C | 116 | 13.3 | 14.314 h |
| June | 26.5°C17.4°C | 17.4°C | 106 | 12.6 | 14.915 h |
| July | 28.4°C19.5°C | 19.5°C | 86 | 11.6 | 14.715 h |
| August | 27.9°C18.9°C | 18.9°C | 81 | 10.0 | 13.714 h |
| September | 24.4°C15.3°C | 15.3°C | 68 | 7.8 | 12.512 h |
| October | 17.6°C9.0°C | 9.0°C | 74 | 8.4 | 11.211 h |
| November | 10.4°C2.8°C | 2.8°C | 82 | 8.9 | 10.010 h |
| December, selected | 4.6°C-2.3°C | -2.3°C | 85 | 9.7 | 9.49 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
- Cincinnati in DecemberUnited States · 76 kmHigh 5.6°C · Low -1.9°C · 92 mm rain
- Columbus in DecemberUnited States · 104 kmHigh 4.5°C · Low -2.7°C · 86 mm rain
- Muncie in DecemberUnited States · 113 kmHigh 3.6°C · Low -3.7°C · 74 mm rain
- Fishers in DecemberUnited States · 157 kmHigh 4.0°C · Low -3.3°C · 76 mm rain
- Carmel in DecemberUnited States · 166 kmHigh 3.9°C · Low -3.3°C · 76 mm rain
- Indianapolis in DecemberUnited States · 168 kmHigh 4.2°C · Low -2.9°C · 78 mm rain
- Fort Wayne in DecemberUnited States · 172 kmHigh 2.9°C · Low -3.9°C · 64 mm rain
- Meads in DecemberUnited States · 197 kmHigh 7.7°C · Low 0.1°C · 95 mm rain
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 Dayton) is explained once on the Dayton year overview and on the Sources, method and limits page.