Less rain falls on Harmston than on 86% of UK towns: 630 mm (25 in) a year
July afternoons average 22.0°C (72°F). Winter and summer sit 21°C apart. Its January nights bite harder than in 76% of UK towns. Windscreens need scraping on about 38 mornings a year, the nights the air drops below 0°C.
Met Office 1991–2020 averages for the town itself.
A year in Harmston at a glance
Each month’s typical high and low, in °C.
What a year in Harmston feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 630 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 Waddington
38 air frosts and 14 days of 25°C a year
On about 38 nights a year the air drops below freezing, and on about 1 days it stays below freezing all day. About 14 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 Waddington
Waddington is 2.2 miles north-east of Harmston, 68 m (223 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 | 7.0°C | 1.6°C | 48 mm | 9.1 | 61 |
| February | 7.7°C | 1.7°C | 38 mm | 8.4 | 84 |
| March | 10.2°C | 3.0°C | 36 mm | 4.7 | 122 |
| April | 13.2°C | 4.9°C | 44 mm | 1.2 | 162 |
| May | 16.3°C | 7.6°C | 47 mm | 0.1 | 203 |
| June | 19.1°C | 10.5°C | 60 mm | 0.0 | 182 |
| July | 21.6°C | 12.7°C | 60 mm | 0.0 | 197 |
| August | 21.4°C | 12.6°C | 59 mm | 0.0 | 184 |
| September | 18.3°C | 10.5°C | 53 mm | 0.0 | 141 |
| October | 14.1°C | 7.6°C | 61 mm | 0.3 | 106 |
| November | 9.9°C | 4.3°C | 57 mm | 2.9 | 69 |
| December | 7.2°C | 2.0°C | 52 mm | 8.6 | 60 |
| Year | 13.8°C | 6.6°C | 616 mm | 35 | 1,571 |
Met Office historic station data, Waddington, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Harmston 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 Lincolnshire 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 |
|---|---|---|---|
| Harmston | 22.0°C | 1.4°C | 630 mm |
| Waddington 2.0 mi | 22.3°C about the same | 1.6°C about the same | 620 mm |
| Navenby 3.1 mi | 22.2°C about the same | 1.2°C about the same | 636 mm |
| Bracebridge Heath 3.2 mi | 22.0°C about the same | 1.4°C about the same | 659 mm |
| North Hykeham 3.3 mi | 22.3°C about the same | 1.6°C about the same | 623 mm |
| South Hykeham 3.8 mi | 22.3°C about the same | 1.5°C about the same | 624 mm |
| Bassingham 3.9 mi | 22.5°C about the same | 1.4°C about the same | 603 mm |
Harmston 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 | 7.1°C 45°F | 1.4°C 35°F | 4.3°C | 51 mm 2.0 in |
| February | 8.0°C 46°F | 1.5°C 35°F | 4.7°C | 39 mm 1.5 in |
| March | 10.4°C 51°F | 2.8°C 37°F | 6.6°C | 37 mm 1.5 in |
| April | 13.4°C 56°F | 4.6°C 40°F | 9.0°C | 45 mm 1.8 in |
| May | 16.6°C 62°F | 7.3°C 45°F | 11.9°C | 48 mm 1.9 in |
| June | 19.4°C 67°F | 10.1°C 50°F | 14.8°C | 61 mm 2.4 in |
| July | 22.0°C 72°F | 12.2°C 54°F | 17.1°C | 61 mm 2.4 in |
| August | 21.7°C 71°F | 12.2°C 54°F | 17.0°C | 60 mm 2.4 in |
| September | 18.7°C 66°F | 10.0°C 50°F | 14.4°C | 53 mm 2.1 in |
| October | 14.4°C 58°F | 7.4°C 45°F | 10.9°C | 63 mm 2.5 in |
| November | 10.1°C 50°F | 4.0°C 39°F | 7.1°C | 58 mm 2.3 in |
| December | 7.4°C 45°F | 1.8°C 35°F | 4.6°C | 55 mm 2.2 in |
| Year | 14.1°C | 6.3°C | 10.2°C | 630 mm |
Where Harmston’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the 1 Met Office 2 km grid square whose centre lies inside Harmston’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 Waddington, 2.2 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 Harmston’s climate
How warm does Harmston get in summer?
July is the warmest month, with average highs of 22.0°C (72°F). About 14 days a year reach 25°C (77°F), more than 65% of UK towns.
How cold does Harmston get in winter?
January nights average 1.4°C (35°F). The air drops below freezing on about 38 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Harmston get?
About 630 mm (25 in) a year, less than 86% of UK towns. October is the wettest month (63 mm) and March the driest (37 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Waddington (2.2 miles away), averages 1,571 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 Harmston. 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 Harmston →
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