Climate averages 1991–2020
Bolu weather
in April.
A mild, wet month: the 7th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Bolu: daytime highs average 15.3°C and nights cool to about 4.4°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 99 mm of rain on roughly 14 days, which makes April a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 16 min on an average April day.
The nearest other city in this atlas is Düzce (39 km away). In April its highs average 17.3°C, 2.0°C warmer than Bolu, with 104 mm of rain.
Among the 138 cities listed in Turkey, Bolu ranks joint 102nd of 138 for the warmest April highs and joint 123rd of 138 for the driest April (rainfall, lowest first). The mean April high of those 138 cities is 17.3°C; Bolu is 2.0°C cooler than that mean.
From April to May, average highs rise by 4.5°C to 19.8°C, and monthly rainfall rises from 99 mm to 110 mm.
The annual picture
April 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, selected | 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 | 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
April in nearby cities
- Düzce in AprilTurkey · 39 kmHigh 17.3°C · Low 6.5°C · 104 mm rain
- Ereğli (Zonguldak Province), Turkey in AprilTurkey · 63 kmHigh 14.3°C · Low 8.6°C · 57 mm rain
- Zonguldak in AprilTurkey · 81 kmHigh 15.7°C · Low 8.2°C · 47 mm rain
- Karabük in AprilTurkey · 100 kmHigh 17.7°C · Low 6.2°C · 80 mm rain
- Adapazarı in AprilTurkey · 101 kmHigh 17.3°C · Low 6.3°C · 74 mm rain
- Bartın in AprilTurkey · 117 kmHigh 16.1°C · Low 7.2°C · 45 mm rain
- Polatlı in AprilTurkey · 137 kmHigh 17.3°C · Low 4.7°C · 38 mm rain
- Ankara in AprilTurkey · 139 kmHigh 17.3°C · Low 5.9°C · 46 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.