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Forest Parish, Guernsey climate
Cfb Oceanic / temperate
Forest Parish has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is August with an average daily high near 68°F, while the coldest is February averaging around 41°F at night. Around 34 inches of precipitation falls each year, peaking in December (4.7 inches) and easing off in July (1.7 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)Forest Parish climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 48 | 48 | 51 | 54 | 59 | 64 | 67 | 68 | 65 | 59 | 54 | 50 |
| Avg temp (°F) | 45 | 44 | 47 | 50 | 54 | 59 | 62 | 63 | 60 | 56 | 50 | 47 |
| Avg low (°F) | 42 | 41 | 42 | 45 | 49 | 53 | 57 | 58 | 56 | 52 | 47 | 43 |
| Precipitation (in) | 3.6 | 3.0 | 2.5 | 2.1 | 1.9 | 1.9 | 1.7 | 2.2 | 2.2 | 3.9 | 4.2 | 4.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 48 | 48 | 51 | 54 | 59 | 64 |
| Avg temp (°F) | 45 | 44 | 47 | 50 | 54 | 59 |
| Avg low (°F) | 42 | 41 | 42 | 45 | 49 | 53 |
| Precipitation (in) | 3.6 | 3.0 | 2.5 | 2.1 | 1.9 | 1.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 67 | 68 | 65 | 59 | 54 | 50 |
| Avg temp (°F) | 62 | 63 | 60 | 56 | 50 | 47 |
| Avg low (°F) | 57 | 58 | 56 | 52 | 47 | 43 |
| Precipitation (in) | 1.7 | 2.2 | 2.2 | 3.9 | 4.2 | 4.7 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 19 | 16 | 15 | 13 | 11 | 11 | 11 | 12 | 12 | 18 | 20 | 19 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | — | 0.0 | 0.1 | — | — | — | — |
| Days with low ≤ 32°F (days) | 1 | 1 | 0.3 | 0.0 | — | — | — | 0.0 | — | — | 0.2 | 0.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 19 | 16 | 15 | 13 | 11 | 11 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | — |
| Days with low ≤ 32°F (days) | 1 | 1 | 0.3 | 0.0 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 12 | 12 | 18 | 20 | 19 |
| Days with high ≥ 90°F (days) | 0.0 | 0.1 | — | — | — | — |
| Days with low ≤ 32°F (days) | — | 0.0 | — | — | 0.2 | 0.7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 83 | 81 | 77 | 69 | 68 | 66 | 64 | 67 | 67 | 77 | 82 | 83 |
| Relative humidity (%) | 83 | 83 | 85 | 85 | 87 | 89 | 89 | 87 | 83 | 82 | 82 | 82 |
| Wind speed (mph) | 17.4 | 16.1 | 14.4 | 12.3 | 11.3 | 10.3 | 10.2 | 10.7 | 12.7 | 15.2 | 16.6 | 17.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 83 | 81 | 77 | 69 | 68 | 66 |
| Relative humidity (%) | 83 | 83 | 85 | 85 | 87 | 89 |
| Wind speed (mph) | 17.4 | 16.1 | 14.4 | 12.3 | 11.3 | 10.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 64 | 67 | 67 | 77 | 82 | 83 |
| Relative humidity (%) | 89 | 87 | 83 | 82 | 82 | 82 |
| Wind speed (mph) | 10.2 | 10.7 | 12.7 | 15.2 | 16.6 | 17.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Guernsey: Airport, 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.