Few UK towns have warmer summer afternoons than Dedham Heath
Winter’s chill peaks in January, at about 1.5°C (35°F) after dark. By rainfall alone, it ranks drier than 95% of UK towns. The gap between a January night and a July afternoon is 22°C. The heating season runs November to April: each of those months averages under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in Dedham Heath at a glance
Each month’s typical high and low, in °C.
What a year in Dedham Heath feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 585 mm of rain a year
November is the wettest month and March the driest. About 13 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
A frosty town: 53 air frosts and 20 days of 25°C a year
On about 53 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 20 days a year reach 25°C (77°F).
Day counts are 1991–2020 averages from the Met Office’s 2 km grid. The Met Office calls a day of 25°C or more a summer day and a night below 0°C an air frost; ground frosts, on grass, come more often.
The Met Office station at Cambridge NIAB
Cambridge NIAB is 43 miles north-west of Dedham Heath, 26 m (85 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full; at that distance read it for sunshine and the station’s own record, not as the town’s figures.
| Month | High | Low | Rain | Air frosts |
|---|---|---|---|---|
| January | 7.7°C | 1.9°C | 49 mm | 9.0 |
| February | 8.3°C | 1.8°C | 36 mm | 8.7 |
| March | 11.0°C | 3.1°C | 33 mm | 5.2 |
| April | 14.1°C | 4.7°C | 38 mm | 2.6 |
| May | 17.4°C | 7.4°C | 43 mm | 0.6 |
| June | 20.4°C | 10.5°C | 49 mm | 0.0 |
| July | 23.1°C | 12.6°C | 48 mm | 0.0 |
| August | 22.9°C | 12.6°C | 56 mm | 0.0 |
| September | 19.6°C | 10.5°C | 51 mm | 0.0 |
| October | 15.1°C | 7.9°C | 59 mm | 0.7 |
| November | 10.7°C | 4.5°C | 53 mm | 3.7 |
| December | 8.0°C | 2.2°C | 50 mm | 9.2 |
| Year | 14.9°C | 6.6°C | 563 mm | 40 |
Met Office historic station data, Cambridge NIAB, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Campbell-Stokes recorder.
How Dedham Heath compares
Against the 2,537 towns and cities of 2,500 or more across the UK, each with its own Met Office averages, and its place among Essex towns that size.
Nearby towns’ climate
The nearest towns of 1,000+ within 12 miles: a hill, a valley or the sea can make a real difference over a few miles.
| Town | July high | January low | Rain a year |
|---|---|---|---|
| Dedham Heath | 23.2°C | 1.5°C | 585 mm |
| Ardleigh 1.3 mi | 23.1°C about the same | 1.5°C about the same | 597 mm |
| Lawford 2.4 mi | 23.2°C about the same | 1.6°C about the same | 563 mm |
| East Bergholt 2.6 mi | 23.0°C about the same | 1.4°C about the same | 622 mm |
| Manningtree 3.0 mi | 23.2°C about the same | 1.6°C about the same | 564 mm |
| Brantham 3.3 mi | 23.2°C about the same | 1.5°C about the same | 564 mm |
| Mistley 4.0 mi | 22.7°C 0.6°C cooler | 1.7°C about the same | 571 mm |
Dedham Heath weather by month
Average daily high and low, mean temperature and rain, 1991–2020, for the town itself (the Met Office’s HadUK-Grid).
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 7.6°C 46°F | 1.5°C 35°F | 4.5°C | 49 mm 1.9 in |
| February | 8.2°C 47°F | 1.5°C 35°F | 4.8°C | 42 mm 1.6 in |
| March | 10.9°C 52°F | 2.7°C 37°F | 6.8°C | 36 mm 1.4 in |
| April | 14.2°C 58°F | 4.2°C 40°F | 9.2°C | 38 mm 1.5 in |
| May | 17.5°C 64°F | 7.0°C 45°F | 12.2°C | 46 mm 1.8 in |
| June | 20.6°C 69°F | 9.8°C 50°F | 15.2°C | 49 mm 1.9 in |
| July | 23.2°C 74°F | 12.1°C 54°F | 17.6°C | 45 mm 1.8 in |
| August | 23.0°C 73°F | 12.0°C 54°F | 17.5°C | 57 mm 2.2 in |
| September | 19.7°C 68°F | 9.7°C 50°F | 14.8°C | 47 mm 1.9 in |
| October | 15.3°C 60°F | 7.2°C 45°F | 11.2°C | 59 mm 2.3 in |
| November | 10.9°C 52°F | 4.0°C 39°F | 7.4°C | 61 mm 2.4 in |
| December | 8.0°C 46°F | 1.9°C 35°F | 4.9°C | 57 mm 2.2 in |
| Year | 14.9°C | 6.1°C | 10.5°C | 585 mm |
Where Dedham Heath’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the Met Office 2 km grid square nearest Dedham Heath’s centre (the town is smaller than one square).
- Highs and lows: the Met Office publishes average daily maxima and minima on its 12 km grid; each is moved by the difference between the town’s 2 km mean temperature and the 12 km square’s, which carries the town’s own height and setting over.
- Weather station and sunshine: Met Office historic station data for Cambridge NIAB, 43 miles away, months of 1991–2020 averaged.
- Comparisons: every town and city of 2,500 or more across the UK, all four nations, read the same way.
Met Office HadUK-Grid · Met Office Climate Data Portal · Historic station data. Open Government Licence v3.0.
Questions about Dedham Heath’s climate
How warm does Dedham Heath get in summer?
July is the warmest month, with average highs of 23.2°C (74°F). About 20 days a year reach 25°C (77°F), more than 90% of UK towns.
How cold does Dedham Heath get in winter?
February nights average 1.5°C (35°F). The air drops below freezing on about 53 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Dedham Heath get?
About 585 mm (23 in) a year, less than 95% of UK towns. November is the wettest month (61 mm) and March the driest (36 mm).
Where do these figures come from?
The Met Office’s HadUK-Grid 1991–2020 averages, which turn thousands of weather stations into a map of the UK in 2 km squares; the page reads the squares inside Dedham Heath. They are 30-year averages, not a forecast.
Contains Met Office data © Crown copyright 2026, Open Government Licence v3.0. HadUK-Grid 1991–2020 averages via the Met Office Climate Data Portal; station averages from Met Office historic station data. Today’s forecast for Dedham Heath →
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.