Climate averages 1991–2020

Bolu weather
in January.

A cold, wet month: the coolest and the 7th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 4.7°C Daytime mean, January

Average low -2.9°C Night-time mean, January

Rainfall 91 mm 14 days with ≥1 mm

Daylight 10 h Sunrise to sunset, per day

January is a cold month in Bolu: daytime highs average 4.7°C and nights cool to about -2.9°C. By daytime temperature it is the coolest month of the year.

Expect about 91 mm of rain on roughly 14 days, which makes January a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 37 min on an average January day.

The nearest other city in this atlas is Düzce (39 km away). In January its highs average 7.9°C, 3.2°C warmer than Bolu, with 100 mm of rain.

Among the 138 cities listed in Turkey, Bolu ranks joint 111th of 138 for the warmest January highs and joint 84th of 138 for the driest January (rainfall, lowest first). The mean January high of those 138 cities is 7.4°C; Bolu is 2.7°C cooler than that mean.

From January to February, average highs rise by 1.3°C to 6.0°C, and monthly rainfall falls from 91 mm to 89 mm.

The annual picture

January in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages 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

1991–2020

Monthly climate averages for Bolu, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	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	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

January in nearby cities

Distance from Bolu

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 limits

How 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.