Colnbrook is among the UK towns with the most days of 25 degrees or more
Midwinter brings lows of about 2.3°C (36°F). Rain is light here, less than falls on 88% of UK towns. Of all months, November brings the most rain and March the least. Gritters and ice scrapers earn their keep on roughly 35 nights a year below 0°C.
Met Office 1991–2020 averages for the town itself.
A year in Colnbrook at a glance
Each month’s typical high and low, in °C.
What a year in Colnbrook feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 621 mm of rain a year
November is the wettest month and March the driest. About 14 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Heathrow
35 air frosts and 26 days of 25°C a year
On about 35 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 26 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 Heathrow
Heathrow is 3.3 miles east of Colnbrook, 25 m (82 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full.
| Month | High | Low | Rain | Air frosts | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.4°C | 2.7°C | 59 mm | 6.8 | 59 |
| February | 9.0°C | 2.6°C | 45 mm | 6.2 | 76 |
| March | 11.7°C | 4.1°C | 39 mm | 3.0 | 120 |
| April | 15.0°C | 6.0°C | 42 mm | 0.8 | 169 |
| May | 18.4°C | 9.1°C | 46 mm | 0.0 | 197 |
| June | 21.6°C | 12.0°C | 47 mm | 0.0 | 197 |
| July | 23.9°C | 14.2°C | 46 mm | 0.0 | 206 |
| August | 23.4°C | 14.1°C | 54 mm | 0.0 | 192 |
| September | 20.2°C | 11.6°C | 50 mm | 0.0 | 150 |
| October | 15.8°C | 8.8°C | 65 mm | 0.3 | 111 |
| November | 11.5°C | 5.3°C | 67 mm | 2.7 | 68 |
| December | 8.8°C | 3.1°C | 57 mm | 7.2 | 53 |
| Year | 15.6°C | 7.8°C | 616 mm | 27 | 1,597 |
Met Office historic station data, Heathrow (London Airport), 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Colnbrook 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 Berkshire 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 |
|---|---|---|---|
| Colnbrook | 23.6°C | 2.3°C | 621 mm |
| Poyle 0.6 mi | 23.6°C about the same | 2.3°C about the same | 643 mm |
| Richings Park 1.7 mi | 23.6°C about the same | 2.2°C about the same | 622 mm |
| Stanwell Moor 1.9 mi | 23.3°C about the same | 2.5°C about the same | 645 mm |
| Datchet 2.0 mi | 23.2°C about the same | 2.2°C about the same | 618 mm |
| Iver 2.5 mi | 23.1°C about the same | 2.1°C about the same | 679 mm |
| Old Windsor and Wraysbury 2.7 mi | 22.8°C 0.8°C cooler | 2.2°C about the same | 689 mm |
Colnbrook 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 | 8.3°C 47°F | 2.3°C 36°F | 5.3°C | 60 mm 2.4 in |
| February | 8.9°C 48°F | 2.3°C 36°F | 5.6°C | 45 mm 1.8 in |
| March | 11.6°C 53°F | 3.6°C 39°F | 7.6°C | 38 mm 1.5 in |
| April | 14.9°C 59°F | 5.3°C 42°F | 10.1°C | 44 mm 1.7 in |
| May | 18.3°C 65°F | 8.3°C 47°F | 13.3°C | 46 mm 1.8 in |
| June | 21.4°C 70°F | 11.3°C 52°F | 16.3°C | 45 mm 1.8 in |
| July | 23.6°C 74°F | 13.3°C 56°F | 18.5°C | 45 mm 1.8 in |
| August | 23.2°C 74°F | 13.2°C 56°F | 18.2°C | 52 mm 2.0 in |
| September | 20.2°C 68°F | 10.9°C 52°F | 15.5°C | 50 mm 2.0 in |
| October | 15.8°C 60°F | 8.2°C 47°F | 12.0°C | 67 mm 2.7 in |
| November | 11.4°C 53°F | 4.9°C 41°F | 8.1°C | 68 mm 2.7 in |
| December | 8.7°C 48°F | 2.6°C 37°F | 5.7°C | 60 mm 2.4 in |
| Year | 15.5°C | 7.2°C | 11.4°C | 621 mm |
Where Colnbrook’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 Colnbrook’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 Heathrow (London Airport), 3.3 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 Colnbrook’s climate
How warm does Colnbrook get in summer?
July is the warmest month, with average highs of 23.6°C (74°F). About 26 days a year reach 25°C (77°F), more than almost every UK town.
How cold does Colnbrook get in winter?
January nights average 2.3°C (36°F). The air drops below freezing on about 35 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Colnbrook get?
About 621 mm (24 in) a year, less than 88% of UK towns. November is the wettest month (68 mm) and March the driest (38 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Heathrow (3.3 miles away), averages 1,597 hours of bright sunshine a year. Sunshine isn’t on the town grid, so this is the station’s figure.
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 Colnbrook. 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 Colnbrook →
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