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Weather & Climate in Welwyn, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Welwyn experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 40°F in January while summers reach 62°F in July. The area gets 225 sunny days per year, above the national average. Annual precipitation totals 30.7 inches. The area receives 4.5 inches of snow annually. The city sits at an elevation of 269 feet.
Temperature
40°F Jan (5°C)
62°F Jul (17°C)
| Annual Average | 51.8°F |
| 4% below US avg | |
| January Average | 40°F (5°C) |
| July Average | 62°F (17°C) |
| Sunny Days | 225 days/yr |
Geography
| Elevation | 269 ft (82 m) |
| Area | 4.0 sq mi (10.2 km²) |
| Population Density | 824/sq mi |
| Coordinates | 51.8331°N, 0.2136°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 | 119 km | 10 km |
| Feb 15, 1994 | 7 km ESE of Thetford, United Kingdom | M4.4 | 94 km | 10 km |
| Oct 28, 2001 | 5 km E of Long Clawson, United Kingdom | M4.2 | 121 km | 12 km |
| Sep 23, 2000 | 1 km WSW of Warwick, United Kingdom | M4.0 | 108 km | 13 km |
| Sep 15, 1994 | 38 km NE of Broadstairs, United Kingdom | M3.9 | 140 km | 10 km |
| Jan 28, 2015 | 2 km WSW of Market Overton, United Kingdom | M3.8 | 105 km | 3 km |
| May 22, 2015 | 3 km SSE of Ramsgate, United Kingdom | M3.7 | 128 km | 12 km |
| May 12, 1994 | 4 km S of Shipston on Stour, United Kingdom | M3.7 | 99 km | 10 km |
| Mar 3, 2009 | 1 km ENE of Hawkinge, United Kingdom | M3.5 | 125 km | 4 km |
| Apr 18, 2014 | 3 km WSW of Market Overton, United Kingdom | M3.5 | 105 km | 2 km |
| Feb 17, 1992 | 1 km W of Warboys, United Kingdom | M3.4 | 64 km | 10 km |
| Jan 21, 1999 | 4 km ENE of Old Leake, United Kingdom | M3.3 | 137 km | 10 km |
| Sep 9, 1995 | 0 km WNW of East Wittering, United Kingdom | M3.3 | 127 km | 10 km |
| Feb 27, 2019 | 3 km SE of Dorking, United Kingdom | M3.3 | 69 km | 10 km |
| Feb 21, 2022 | 5 km N of Hockley, United Kingdom | M3.2 | 141 km | 10 km |
| Nov 5, 1994 | 5 km N of Debenham, United Kingdom | M3.0 | 108 km | 5 km |
| Mar 18, 2001 | 8 km W of Marlborough, United Kingdom | M2.9 | 121 km | 10 km |
| Jul 16, 2005 | 3 km WSW of Southwater, United Kingdom | M2.9 | 93 km | 5 km |
| Jan 18, 2013 | 0 km NE of Hathern, United Kingdom | M2.9 | 129 km | 13 km |
| Jan 27, 2015 | 1 km ENE of Winchester, United Kingdom | M2.9 | 113 km | 3 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 0.9 m (3 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1911 | FOLKSTONE, ENGLAND | Meteorological | 0.9 m | — | 130 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (5°C) | 2.6 in | |
| February | 39°F (4°C) | 1.7 in | Coldest |
| March | 43°F (6°C) | 2.0 in | |
| April | 46°F (8°C) | 1.9 in | |
| May | 53°F (11°C) | 1.9 in | |
| June | 58°F (14°C) | 2.2 in | |
| July | 62°F (17°C) | 1.7 in | Warmest, Driest |
| August | 62°F (17°C) | 2.1 in | |
| September | 57°F (14°C) | 2.3 in | |
| October | 51°F (10°C) | 2.6 in | Wettest |
| November | 44°F (7°C) | 2.5 in | |
| December | 41°F (5°C) | 2.5 in |
Welwyn has a seasonal temperature swing of 23°F / from 39°F in February to 62°F in July. Total annual precipitation is 26.0 inches, with October being the wettest month (2.6") and July the driest (1.7").