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 84°F, while the coldest is January averaging around 26°F at night. Around 22 inches of precipitation falls each year, peaking in June (2.7 inches) and easing off in August (0.8 inches).
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 (°F) | 42 | 46 | 53 | 63 | 72 | 78 | 83 | 84 | 77 | 68 | 56 | 45 |
| Avg temp (°F) | 34 | 38 | 44 | 51 | 60 | 66 | 70 | 71 | 65 | 57 | 46 | 38 |
| Avg low (°F) | 26 | 28 | 32 | 39 | 47 | 53 | 57 | 57 | 51 | 45 | 35 | 30 |
| Precipitation (in) | 2.2 | 2.0 | 2.3 | 1.9 | 2.4 | 2.7 | 1.4 | 0.8 | 1.1 | 1.8 | 1.6 | 2.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 42 | 46 | 53 | 63 | 72 | 78 |
| Avg temp (°F) | 34 | 38 | 44 | 51 | 60 | 66 |
| Avg low (°F) | 26 | 28 | 32 | 39 | 47 | 53 |
| Precipitation (in) | 2.2 | 2.0 | 2.3 | 1.9 | 2.4 | 2.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 84 | 77 | 68 | 56 | 45 |
| Avg temp (°F) | 70 | 71 | 65 | 57 | 46 | 38 |
| Avg low (°F) | 57 | 57 | 51 | 45 | 35 | 30 |
| Precipitation (in) | 1.4 | 0.8 | 1.1 | 1.8 | 1.6 | 2.2 |
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 ≥ 90°F (days) | — | — | — | — | 0.3 | 1 | 4 | 5 | 2 | 0.2 | — | — |
| Days with low ≤ 32°F (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 ≥ 90°F (days) | — | — | — | — | 0.3 | 1 |
| Days with low ≤ 32°F (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 ≥ 90°F (days) | 4 | 5 | 2 | 0.2 | — | — |
| Days with low ≤ 32°F (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 (mph) | 5.3 | 5.8 | 5.9 | 5.2 | 4.6 | 4.8 | 5.2 | 5.1 | 4.5 | 4.2 | 4.5 | 5.0 |
| 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 (mph) | 5.3 | 5.8 | 5.9 | 5.2 | 4.6 | 4.8 |
| 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 (mph) | 5.2 | 5.1 | 4.5 | 4.2 | 4.5 | 5.0 |
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.