Climate averages 1991–2020
İzmit weather
in December.
A cool, wet month: the 10th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in İzmit: daytime highs average 10.5°C and nights cool to about 3.4°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 110 mm of rain on roughly 14 days, which makes December a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 9 h 19 min on an average December day.
The nearest other city in this atlas is Derince (10 km away). In December its highs average 10.5°C, about as warm as İzmit, with 103 mm of rain.
Among the 138 cities listed in Turkey, İzmit ranks joint 53rd of 138 for the warmest December highs and joint 113th of 138 for the driest December (rainfall, lowest first). The mean December high of those 138 cities is 9.3°C; İzmit is 1.2°C warmer than that mean.
From December to January, average highs fall by 1.7°C to 8.8°C, and monthly rainfall falls from 110 mm to 101 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
İzmit climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.8°C1.4°C | 1.4°C | 101 | 13.9 | 9.610 h |
| February | 10.2°C1.8°C | 1.8°C | 90 | 13.4 | 10.611 h |
| March | 13.2°C3.9°C | 3.9°C | 97 | 13.9 | 11.912 h |
| April | 17.9°C7.7°C | 7.7°C | 76 | 11.7 | 13.313 h |
| May | 22.3°C12.4°C | 12.4°C | 73 | 10.9 | 14.414 h |
| June | 25.9°C16.8°C | 16.8°C | 75 | 10.6 | 15.015 h |
| July | 28.0°C19.2°C | 19.2°C | 43 | 6.5 | 14.815 h |
| August | 28.2°C19.8°C | 19.8°C | 41 | 6.4 | 13.814 h |
| September | 25.0°C16.5°C | 16.5°C | 61 | 8.4 | 12.513 h |
| October | 20.4°C12.6°C | 12.6°C | 90 | 11.0 | 11.211 h |
| November | 15.5°C7.3°C | 7.3°C | 80 | 10.4 | 10.010 h |
| December, selected | 10.5°C3.4°C | 3.4°C | 110 | 13.5 | 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
- Derince in DecemberTurkey · 10 kmHigh 10.5°C · Low 3.7°C · 103 mm rain
- Adapazarı in DecemberTurkey · 40 kmHigh 9.9°C · Low 2.0°C · 103 mm rain
- Gebze in DecemberTurkey · 42 kmHigh 9.5°C · Low 4.2°C · 86 mm rain
- Yalova in DecemberTurkey · 56 kmHigh 10.6°C · Low 4.9°C · 100 mm rain
- Sultanbeyli in DecemberTurkey · 60 kmHigh 9.7°C · Low 5.3°C · 100 mm rain
- Sancaktepe in DecemberTurkey · 64 kmHigh 9.8°C · Low 5.8°C · 100 mm rain
- Bilecik in DecemberTurkey · 69 kmHigh 8.4°C · Low 0.1°C · 62 mm rain
- Ümraniye in DecemberTurkey · 73 kmHigh 9.6°C · Low 5.7°C · 99 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 İzmit) is explained once on the İzmit year overview and on the Sources, method and limits page.