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Chelmsford, England climate
Cfb Oceanic / temperate
Chelmsford has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 74°F, while the coldest is January averaging around 35°F at night. Precipitation is fairly even year-round, totalling about 23 inches. At latitude 52°N, day length swings from 7.6 hours in midwinter to 16.4 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsChelmsford climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 46 | 47 | 52 | 58 | 64 | 69 | 74 | 73 | 67 | 59 | 52 | 47 |
| Avg temp (°F) | 41 | 41 | 45 | 49 | 54 | 60 | 64 | 64 | 58 | 52 | 45 | 41 |
| Avg low (°F) | 35 | 35 | 37 | 40 | 45 | 50 | 54 | 54 | 50 | 45 | 39 | 35 |
| Precipitation (in) | 2.2 | 1.7 | 1.4 | 1.5 | 1.7 | 2.0 | 1.8 | 2.0 | 1.9 | 2.4 | 2.4 | 2.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 46 | 47 | 52 | 58 | 64 | 69 |
| Avg temp (°F) | 41 | 41 | 45 | 49 | 54 | 60 |
| Avg low (°F) | 35 | 35 | 37 | 40 | 45 | 50 |
| Precipitation (in) | 2.2 | 1.7 | 1.4 | 1.5 | 1.7 | 2.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 74 | 73 | 67 | 59 | 52 | 47 |
| Avg temp (°F) | 64 | 64 | 58 | 52 | 45 | 41 |
| Avg low (°F) | 54 | 54 | 50 | 45 | 39 | 35 |
| Precipitation (in) | 1.8 | 2.0 | 1.9 | 2.4 | 2.4 | 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) | 17 | 14 | 13 | 12 | 11 | 11 | 11 | 11 | 11 | 15 | 16 | 16 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | 0.0 | 0.3 | 0.5 | 0.0 | — | — | — |
| Days with low ≤ 32°F (days) | 10 | 10 | 7 | 5 | 1 | — | — | — | 0.1 | 2 | 6 | 11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 17 | 14 | 13 | 12 | 11 | 11 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | 0.0 |
| Days with low ≤ 32°F (days) | 10 | 10 | 7 | 5 | 1 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 11 | 11 | 15 | 16 | 16 |
| Days with high ≥ 90°F (days) | 0.3 | 0.5 | 0.0 | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 0.1 | 2 | 6 | 11 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 74 | 74 | 74 | 69 | 69 | 71 | 67 | 68 | 68 | 72 | 75 | 74 |
| Clear days (≤ 30% cloud) | 2 | 2 | 2 | 3 | 3 | 2 | 3 | 3 | 3 | 2 | 1 | 2 |
| Partly cloudy days (30–70%) | 9 | 9 | 9 | 10 | 10 | 10 | 12 | 12 | 12 | 10 | 9 | 10 |
| Cloudy days (≥ 70%) | 20 | 18 | 20 | 17 | 18 | 18 | 16 | 17 | 16 | 19 | 19 | 20 |
| Relative humidity (%) | 91 | 89 | 85 | 82 | 80 | 79 | 78 | 79 | 82 | 86 | 91 | 93 |
| Wind speed (mph) | 10.4 | 10.0 | 9.3 | 8.1 | 8.0 | 7.5 | 7.4 | 7.8 | 8.3 | 9.4 | 9.4 | 10.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 74 | 74 | 74 | 69 | 69 | 71 |
| Clear days (≤ 30% cloud) | 2 | 2 | 2 | 3 | 3 | 2 |
| Partly cloudy days (30–70%) | 9 | 9 | 9 | 10 | 10 | 10 |
| Cloudy days (≥ 70%) | 20 | 18 | 20 | 17 | 18 | 18 |
| Relative humidity (%) | 91 | 89 | 85 | 82 | 80 | 79 |
| Wind speed (mph) | 10.4 | 10.0 | 9.3 | 8.1 | 8.0 | 7.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 68 | 68 | 72 | 75 | 74 |
| Clear days (≤ 30% cloud) | 3 | 3 | 3 | 2 | 1 | 2 |
| Partly cloudy days (30–70%) | 12 | 12 | 12 | 10 | 9 | 10 |
| Cloudy days (≥ 70%) | 16 | 17 | 16 | 19 | 19 | 20 |
| Relative humidity (%) | 78 | 79 | 82 | 86 | 91 | 93 |
| Wind speed (mph) | 7.4 | 7.8 | 8.3 | 9.4 | 9.4 | 10.0 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Writtle, a weather station, about 3 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.