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Saint-Brieuc, Brittany climate
Cfb Oceanic / temperate
Saint-Brieuc has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is August with an average daily high near 22°C, while the coldest is January averaging around 5°C at night. Around 710 mm of precipitation falls each year, peaking in November (86 mm) and easing off in July (42 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)Saint-Brieuc climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 10 | 12 | 14 | 16 | 19 | 21 | 22 | 20 | 17 | 13 | 10 |
| Avg temp (°C) | 7 | 7 | 9 | 11 | 13 | 16 | 18 | 18 | 17 | 14 | 10 | 8 |
| Avg low (°C) | 5 | 5 | 6 | 8 | 10 | 13 | 15 | 15 | 14 | 11 | 8 | 6 |
| Precipitation (mm) | 64 | 54 | 47 | 49 | 51 | 49 | 42 | 51 | 54 | 79 | 86 | 84 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 10 | 12 | 14 | 16 | 19 |
| Avg temp (°C) | 7 | 7 | 9 | 11 | 13 | 16 |
| Avg low (°C) | 5 | 5 | 6 | 8 | 10 | 13 |
| Precipitation (mm) | 64 | 54 | 47 | 49 | 51 | 49 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 22 | 20 | 17 | 13 | 10 |
| Avg temp (°C) | 18 | 18 | 17 | 14 | 10 | 8 |
| Avg low (°C) | 15 | 15 | 14 | 11 | 8 | 6 |
| Precipitation (mm) | 42 | 51 | 54 | 79 | 86 | 84 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 72 | 69 | 66 | 66 | 64 | 62 | 62 | 60 | 68 | 71 | 71 |
| Relative humidity (%) | 90 | 87 | 85 | 82 | 81 | 81 | 80 | 80 | 80 | 85 | 88 | 90 |
| Wind speed (m/s) | 4.6 | 4.4 | 4.1 | 3.8 | 3.5 | 3.3 | 3.2 | 3.2 | 3.5 | 4.0 | 4.3 | 4.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 72 | 69 | 66 | 66 | 64 |
| Relative humidity (%) | 90 | 87 | 85 | 82 | 81 | 81 |
| Wind speed (m/s) | 4.6 | 4.4 | 4.1 | 3.8 | 3.5 | 3.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 62 | 60 | 68 | 71 | 71 |
| Relative humidity (%) | 80 | 80 | 80 | 85 | 88 | 90 |
| Wind speed (m/s) | 3.2 | 3.2 | 3.5 | 4.0 | 4.3 | 4.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Saint-cast-le-g, a weather station, about 41 km from the city centre. 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.