Bolu, Turkey climate
Cfb Oceanic / temperate
Bolu has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is August with an average daily high near 29°C, while the coldest is January averaging around −3°C at night. Around 571 mm of precipitation falls each year, peaking in June (69 mm) and easing off in August (21 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Bolu climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 8 | 12 | 17 | 22 | 25 | 28 | 29 | 25 | 20 | 14 | 7 |
| Avg temp (°C) | 1 | 3 | 6 | 11 | 15 | 19 | 21 | 21 | 18 | 14 | 8 | 3 |
| Avg low (°C) | −3 | −2 | 0 | 4 | 8 | 12 | 14 | 14 | 10 | 7 | 2 | −1 |
| Precipitation (mm) | 56 | 52 | 57 | 47 | 62 | 69 | 36 | 21 | 29 | 47 | 40 | 55 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 8 | 12 | 17 | 22 | 25 |
| Avg temp (°C) | 1 | 3 | 6 | 11 | 15 | 19 |
| Avg low (°C) | −3 | −2 | 0 | 4 | 8 | 12 |
| Precipitation (mm) | 56 | 52 | 57 | 47 | 62 | 69 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 29 | 25 | 20 | 14 | 7 |
| Avg temp (°C) | 21 | 21 | 18 | 14 | 8 | 3 |
| Avg low (°C) | 14 | 14 | 10 | 7 | 2 | −1 |
| Precipitation (mm) | 36 | 21 | 29 | 47 | 40 | 55 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 14 | 12 | 14 | 11 | 11 | 10 | 5 | 4 | 6 | 9 | 9 | 13 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.3 | 1 | 4 | 5 | 2 | 0.2 | — | — |
| Days with low ≤ 0°C (days) | 17 | 15 | 12 | 4 | 0.3 | — | — | — | — | 0.8 | 9 | 14 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 14 | 12 | 14 | 11 | 11 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.3 | 1 |
| Days with low ≤ 0°C (days) | 17 | 15 | 12 | 4 | 0.3 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 4 | 6 | 9 | 9 | 13 |
| Days with high ≥ 32°C (days) | 4 | 5 | 2 | 0.2 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.8 | 9 | 14 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 71 | 69 | 67 | 61 | 50 | 38 | 36 | 44 | 55 | 59 | 72 |
| Relative humidity (%) | 90 | 84 | 75 | 70 | 68 | 67 | 62 | 60 | 62 | 69 | 77 | 88 |
| Wind speed (km/h) | 8.5 | 9.4 | 9.5 | 8.4 | 7.3 | 7.7 | 8.4 | 8.2 | 7.2 | 6.8 | 7.3 | 8.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 71 | 69 | 67 | 61 | 50 |
| Relative humidity (%) | 90 | 84 | 75 | 70 | 68 | 67 |
| Wind speed (km/h) | 8.5 | 9.4 | 9.5 | 8.4 | 7.3 | 7.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 38 | 36 | 44 | 55 | 59 | 72 |
| Relative humidity (%) | 62 | 60 | 62 | 69 | 77 | 88 |
| Wind speed (km/h) | 8.4 | 8.2 | 7.2 | 6.8 | 7.3 | 8.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Bolu, a weather station, inside the city. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.