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Weather & Climate in Chelmsford, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Chelmsford experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 42°F in January while summers reach 64°F in July. The area gets 238 sunny days per year, above the national average. Annual precipitation totals 31.0 inches. The area receives 3.4 inches of snow annually. The city sits at an elevation of 108 feet.
Temperature
42°F Jan (5°C)
64°F Jul (18°C)
| Annual Average | 53.1°F |
| 2% below US avg | |
| January Average | 42°F (5°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 238 days/yr |
Geography
| Elevation | 108 ft (33 m) |
| Area | 9.9 sq mi (25.7 km²) |
| Population Density | 11,241/sq mi |
| Coordinates | 51.7358°N, 0.4696°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
34 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.6.
| Apr 28, 2007 | 1 km WNW of Lympne, United Kingdom | M4.6 | 82 km | 10 km |
| Feb 15, 1994 | 7 km ESE of Thetford, United Kingdom | M4.4 | 76 km | 10 km |
| Jan 23, 2007 | 57 km ENE of Broadstairs, United Kingdom | M4.1 | 115 km | 10 km |
| Sep 15, 1994 | 38 km NE of Broadstairs, United Kingdom | M3.9 | 92 km | 10 km |
| Jan 28, 2015 | 2 km WSW of Market Overton, United Kingdom | M3.8 | 137 km | 3 km |
| Jan 27, 1998 | 27 km W of Le Touquet-Paris-Plage, France | M3.8 | 147 km | 2 km |
| May 22, 2015 | 3 km SSE of Ramsgate, United Kingdom | M3.7 | 82 km | 12 km |
| May 12, 1994 | 4 km S of Shipston on Stour, United Kingdom | M3.7 | 148 km | 10 km |
| Mar 3, 2009 | 1 km ENE of Hawkinge, United Kingdom | M3.5 | 85 km | 4 km |
| Apr 18, 2014 | 3 km WSW of Market Overton, United Kingdom | M3.5 | 137 km | 2 km |
| Feb 17, 1992 | 1 km W of Warboys, United Kingdom | M3.4 | 84 km | 10 km |
| Sep 9, 1995 | 0 km WNW of East Wittering, United Kingdom | M3.3 | 143 km | 10 km |
| Feb 27, 2019 | 3 km SE of Dorking, United Kingdom | M3.3 | 79 km | 10 km |
| Jan 21, 1999 | 4 km ENE of Old Leake, United Kingdom | M3.3 | 147 km | 10 km |
| Feb 13, 1997 | 26 km W of Le Touquet-Paris-Plage, France | M3.2 | 145 km | 5 km |
| May 4, 1990 | 0 km NE of Coquelles, France | M3.1 | 128 km | 10 km |
| Mar 28, 1996 | 67 km ESE of Aldeburgh, United Kingdom | M3.0 | 139 km | 10 km |
| Nov 25, 1998 | 26 km N of Grand-Fort-Philippe, France | M3.0 | 125 km | 10 km |
| Nov 5, 1994 | 5 km N of Debenham, United Kingdom | M3.0 | 77 km | 5 km |
| Feb 15, 1994 | 4 km NNE of Banham, United Kingdom | M2.9 | 93 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 6.0 m (20 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1858 | NORTH SEA | Unknown | 6.0 m | — | 112 km |
| 1911 | FOLKSTONE, ENGLAND | Meteorological | 0.9 m | — | 89 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (5°C) | 2.2 in | |
| February | 39°F (4°C) | 1.4 in | Coldest, Driest |
| March | 43°F (6°C) | 1.8 in | |
| April | 46°F (8°C) | 1.7 in | |
| May | 52°F (11°C) | 1.7 in | |
| June | 58°F (14°C) | 2.1 in | |
| July | 64°F (18°C) | 1.6 in | Warmest |
| August | 62°F (17°C) | 2.0 in | |
| September | 57°F (14°C) | 2.1 in | |
| October | 51°F (10°C) | 2.2 in | |
| November | 44°F (7°C) | 2.3 in | Wettest |
| December | 40°F (5°C) | 2.1 in |
Chelmsford has a seasonal temperature swing of 25°F / from 39°F in February to 64°F in July. Total annual precipitation is 23.2 inches, with November being the wettest month (2.3") and February the driest (1.4").