Climate averages 1991–2020
Bolu weather
in December.
A cold, wet month: the 10th warmest and the joint 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Bolu: daytime highs average 6.7°C and nights cool to about -1.0°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 96 mm of rain on roughly 14 days, which makes December a wet month (the joint 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 19 min on an average December day.
The nearest other city in this atlas is Düzce (39 km away). In December its highs average 9.8°C, 3.1°C warmer than Bolu, with 105 mm of rain.
Among the 138 cities listed in Turkey, Bolu ranks joint 109th of 138 for the warmest December highs and joint 82nd of 138 for the driest December (rainfall, lowest first). The mean December high of those 138 cities is 9.3°C; Bolu is 2.6°C cooler than that mean.
From December to January, average highs fall by 2.0°C to 4.7°C, and monthly rainfall falls from 96 mm to 91 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
Bolu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.7°C-2.9°C | -2.9°C | 91 | 13.9 | 9.610 h |
| February | 6.0°C-2.5°C | -2.5°C | 89 | 13.8 | 10.611 h |
| March | 9.9°C0.3°C | 0.3°C | 107 | 14.9 | 11.912 h |
| April | 15.3°C4.4°C | 4.4°C | 99 | 14.4 | 13.313 h |
| May | 19.8°C9.2°C | 9.2°C | 110 | 15.7 | 14.414 h |
| June | 22.8°C12.9°C | 12.9°C | 96 | 13.2 | 15.015 h |
| July | 25.5°C15.0°C | 15.0°C | 50 | 8.7 | 14.815 h |
| August | 26.3°C15.7°C | 15.7°C | 52 | 8.4 | 13.814 h |
| September | 23.1°C12.4°C | 12.4°C | 66 | 8.7 | 12.513 h |
| October | 18.4°C8.5°C | 8.5°C | 90 | 10.9 | 11.211 h |
| November | 12.3°C2.8°C | 2.8°C | 75 | 10.2 | 10.010 h |
| December, selected | 6.7°C-1.0°C | -1.0°C | 96 | 13.7 | 9.39 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
- Düzce in DecemberTurkey · 39 kmHigh 9.8°C · Low 1.6°C · 105 mm rain
- Ereğli (Zonguldak Province), Turkey in DecemberTurkey · 63 kmHigh 10.4°C · Low 5.6°C · 108 mm rain
- Zonguldak in DecemberTurkey · 81 kmHigh 10.7°C · Low 4.7°C · 107 mm rain
- Karabük in DecemberTurkey · 100 kmHigh 9.1°C · Low 0.6°C · 79 mm rain
- Adapazarı in DecemberTurkey · 101 kmHigh 9.9°C · Low 2.0°C · 103 mm rain
- Bartın in DecemberTurkey · 117 kmHigh 10.4°C · Low 3.7°C · 90 mm rain
- Polatlı in DecemberTurkey · 137 kmHigh 7.1°C · Low -1.7°C · 43 mm rain
- Ankara in DecemberTurkey · 139 kmHigh 7.3°C · Low -0.3°C · 53 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 Bolu) is explained once on the Bolu year overview and on the Sources, method and limits page.