Ice on the ground: Alton sees more frosts than 85% of UK towns
Expect July afternoons of about 22.3°C (72°F). Warm days come often: about 16 a year reach 25°C, more than in 76% of UK towns. Wet weather is most frequent in November and least in May. Picnics, hikes and garden evenings come into their own from June to September, with highs of 19–22°C.
Met Office 1991–2020 averages for the town itself.
A year in Alton at a glance
Each month’s typical high and low, in °C.
What a year in Alton feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 922 mm of rain a year
November is the wettest month and May the driest. About 28 days a year bring 10 mm (0.4 in) or more. 9th wettest of 77 Hampshire towns of 2,500+.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Heathrow
50 air frosts and 16 days of 25°C a year
On about 50 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 Heathrow
Heathrow is 32 miles north-east of Alton, 25 m (82 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 | 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 Alton 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 Hampshire 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 |
|---|---|---|---|
| Alton | 22.3°C | 1.6°C | 922 mm |
| Holybourne 1.4 mi | 22.3°C about the same | 1.4°C about the same | 920 mm |
| Four Marks 4.4 mi | 21.8°C 0.5°C cooler | 1.1°C about the same | 931 mm |
| Bentley 5.0 mi | 22.2°C about the same | 1.7°C about the same | 822 mm |
| Whitehill 5.6 mi | 22.5°C about the same | 1.6°C about the same | 925 mm |
| Bordon 5.6 mi | 22.5°C about the same | 1.6°C about the same | 921 mm |
| Lindford 5.9 mi | 23.0°C 0.7°C warmer | 1.6°C about the same | 872 mm |
Alton 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 | 7.7°C 46°F | 1.6°C 35°F | 4.6°C | 102 mm 4.0 in |
| February | 8.1°C 47°F | 1.2°C 34°F | 4.6°C | 72 mm 2.8 in |
| March | 10.6°C 51°F | 2.7°C 37°F | 6.6°C | 62 mm 2.4 in |
| April | 13.9°C 57°F | 4.0°C 39°F | 8.9°C | 63 mm 2.5 in |
| May | 17.1°C 63°F | 6.9°C 44°F | 12.0°C | 55 mm 2.2 in |
| June | 20.1°C 68°F | 9.8°C 50°F | 14.9°C | 60 mm 2.4 in |
| July | 22.3°C 72°F | 11.8°C 53°F | 17.1°C | 59 mm 2.3 in |
| August | 21.9°C 71°F | 11.8°C 53°F | 16.9°C | 69 mm 2.7 in |
| September | 18.9°C 66°F | 9.7°C 49°F | 14.3°C | 67 mm 2.6 in |
| October | 14.9°C 59°F | 7.1°C 45°F | 11.0°C | 102 mm 4.0 in |
| November | 10.6°C 51°F | 4.0°C 39°F | 7.3°C | 109 mm 4.3 in |
| December | 8.1°C 47°F | 1.9°C 35°F | 4.9°C | 103 mm 4.1 in |
| Year | 14.5°C | 6.0°C | 10.3°C | 922 mm |
Where Alton’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the 2 Met Office 2 km grid squares whose centre lies inside Alton’s built-up area.
- 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), 32 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 Alton’s climate
How warm does Alton get in summer?
July is the warmest month, with average highs of 22.3°C (72°F). About 16 days a year reach 25°C (77°F), more than 76% of UK towns.
How cold does Alton get in winter?
February nights average 1.2°C (34°F). The air drops below freezing on about 50 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Alton get?
About 922 mm (36 in) a year, more than 72% of UK towns. November is the wettest month (109 mm) and May the driest (55 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Heathrow (32 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 Alton. 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 Alton →
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.