Climate averages 1991–2020
Sumy weather
in December.
A freezing month with moderate precipitation: the 10th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a freezing month in Sumy: daytime highs average -1.4°C and nights cool to about -5.6°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 40 mm of precipitation on roughly 9 days, which makes December a month with moderate precipitation (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 02 min on an average December day.
The nearest other city in this atlas is Konotop (117 km away). In December its highs average -1.1°C, about as warm as Sumy, with 41 mm of precipitation.
Among the 59 cities listed in Ukraine, Sumy ranks 58th of 59 for the warmest December highs and joint 23rd of 59 for the driest December (precipitation, lowest first). The mean December high of those 59 cities is 1.1°C; Sumy is 2.4°C cooler than that mean.
From December to January, average highs fall by 1.7°C to -3.0°C, and monthly precipitation rises from 40 mm to 42 mm.
The annual picture
December in context
Monthly precipitation
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
Sumy climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -3.0°C-7.5°C | -7.5°C | 42 | 9.9 | 8.58 h |
| February | -1.9°C-7.8°C | -7.8°C | 35 | 8.9 | 10.010 h |
| March | 4.0°C-3.7°C | -3.7°C | 42 | 9.6 | 11.812 h |
| April | 13.2°C3.3°C | 3.3°C | 43 | 9.3 | 13.814 h |
| May | 19.5°C9.5°C | 9.5°C | 61 | 11.3 | 15.516 h |
| June | 23.2°C13.7°C | 13.7°C | 67 | 11.0 | 16.416 h |
| July | 25.2°C15.9°C | 15.9°C | 73 | 11.2 | 16.016 h |
| August | 24.6°C15.0°C | 15.0°C | 47 | 7.6 | 14.615 h |
| September | 18.5°C10.1°C | 10.1°C | 51 | 8.2 | 12.713 h |
| October | 11.1°C4.4°C | 4.4°C | 50 | 8.8 | 10.811 h |
| November | 3.4°C-1.1°C | -1.1°C | 41 | 8.1 | 9.09 h |
| December, selected | -1.4°C-5.6°C | -5.6°C | 40 | 9.2 | 8.08 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
- Konotop in DecemberUkraine · 117 kmHigh -1.1°C · Low -5.1°C · 41 mm precipitation
- Belgorod in DecemberRussia · 130 kmHigh -1.6°C · Low -5.8°C · 43 mm precipitation
- Kursk in DecemberRussia · 132 kmHigh -2.1°C · Low -6.4°C · 39 mm precipitation
- Shostka in DecemberUkraine · 140 kmHigh -1.6°C · Low -5.5°C · 41 mm precipitation
- Kharkiv in DecemberUkraine · 146 kmHigh -0.8°C · Low -5.2°C · 43 mm precipitation
- Poltava in DecemberUkraine · 149 kmHigh -0.4°C · Low -4.7°C · 40 mm precipitation
- Zheleznogorsk (Kursk Oblast), Russia in DecemberRussia · 163 kmHigh -2.1°C · Low -6.2°C · 41 mm precipitation
- Gubkin in DecemberRussia · 195 kmHigh -2.0°C · Low -6.4°C · 41 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 Sumy) is explained once on the Sumy year overview and on the Sources, method and limits page.