Hardly any UK towns wake to more frost than Calvert
The warmest part of a July day comes in at 22.4°C (72°F) on average. Only 21°C separates winter nights from summer afternoons. Warm days come often: about 16 a year reach 25°C, more than in 77% of UK towns. Keep the boiler serviced for the months from November to April, which average under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in Calvert at a glance
Each month’s typical high and low, in °C.
What a year in Calvert feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 665 mm of rain a year
October is the wettest month and March the driest. About 15 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Oxford
A frosty town: 61 air frosts and 16 days of 25°C a year
On about 61 nights a year the air drops below freezing, and on about 1 days it stays below freezing all day. About 16 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 Oxford
Oxford is 15 miles south-west of Calvert, 63 m (207 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 | 8.0°C | 2.4°C | 60 mm | 8.4 | 64 |
| February | 8.6°C | 2.3°C | 47 mm | 7.6 | 82 |
| March | 11.3°C | 3.6°C | 43 mm | 3.8 | 118 |
| April | 14.4°C | 5.3°C | 49 mm | 1.5 | 166 |
| May | 17.7°C | 8.2°C | 57 mm | 0.1 | 200 |
| June | 20.7°C | 11.1°C | 50 mm | 0.0 | 198 |
| July | 23.1°C | 13.1°C | 53 mm | 0.0 | 212 |
| August | 22.5°C | 13.0°C | 62 mm | 0.0 | 193 |
| September | 19.4°C | 10.7°C | 52 mm | 0.0 | 145 |
| October | 15.1°C | 8.0°C | 73 mm | 0.7 | 110 |
| November | 10.9°C | 4.9°C | 72 mm | 3.2 | 71 |
| December | 8.2°C | 2.6°C | 66 mm | 8.6 | 57 |
| Year | 15.0°C | 7.1°C | 681 mm | 34 | 1,615 |
Met Office historic station data, Oxford, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Campbell-Stokes recorder.
How Calvert 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 Buckinghamshire 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 |
|---|---|---|---|
| Calvert | 22.4°C | 0.9°C | 665 mm |
| Steeple Claydon 1.9 mi | 22.4°C about the same | 1.0°C about the same | 663 mm |
| Quainton 4.3 mi | 22.4°C about the same | 1.0°C about the same | 674 mm |
| Launton 5.1 mi | 22.8°C about the same | 1.2°C about the same | 665 mm |
| Winslow 5.5 mi | 22.4°C about the same | 1.1°C about the same | 669 mm |
| Waddesdon 5.7 mi | 22.9°C about the same | 1.1°C about the same | 641 mm |
| Ambrosden 5.8 mi | 22.8°C about the same | 1.2°C about the same | 651 mm |
Calvert 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 | 7.3°C 45°F | 0.9°C 34°F | 4.1°C | 55 mm 2.2 in |
| February | 8.0°C 46°F | 1.0°C 34°F | 4.5°C | 46 mm 1.8 in |
| March | 10.7°C 51°F | 2.1°C 36°F | 6.4°C | 40 mm 1.6 in |
| April | 13.8°C 57°F | 3.7°C 39°F | 8.7°C | 48 mm 1.9 in |
| May | 16.9°C 62°F | 6.4°C 44°F | 11.6°C | 61 mm 2.4 in |
| June | 19.9°C 68°F | 9.3°C 49°F | 14.6°C | 47 mm 1.8 in |
| July | 22.4°C 72°F | 11.3°C 52°F | 16.9°C | 53 mm 2.1 in |
| August | 21.9°C 71°F | 11.1°C 52°F | 16.5°C | 60 mm 2.4 in |
| September | 18.9°C 66°F | 8.7°C 48°F | 13.8°C | 52 mm 2.1 in |
| October | 14.6°C 58°F | 6.2°C 43°F | 10.4°C | 74 mm 2.9 in |
| November | 10.4°C 51°F | 3.3°C 38°F | 6.9°C | 69 mm 2.7 in |
| December | 7.7°C 46°F | 1.2°C 34°F | 4.5°C | 61 mm 2.4 in |
| Year | 14.4°C | 5.4°C | 9.9°C | 665 mm |
Where Calvert’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 Calvert’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 Oxford, 15 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 Calvert’s climate
How warm does Calvert get in summer?
July is the warmest month, with average highs of 22.4°C (72°F). About 16 days a year reach 25°C (77°F), more than 77% of UK towns.
How cold does Calvert get in winter?
January nights average 0.9°C (34°F). The air drops below freezing on about 61 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Calvert get?
About 665 mm (26 in) a year, less than 76% of UK towns. October is the wettest month (74 mm) and March the driest (40 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Oxford (15 miles away), averages 1,615 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 Calvert. 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 Calvert →
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.