Trimley St Mary sits near the bottom of UK towns for frosts
July afternoons average 22.4°C (72°F). A year here swings 20°C from midwinter lows to midsummer highs. It is a dry place: less rain falls here than on 91% of UK towns. 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 Trimley St Mary at a glance
Each month’s typical high and low, in °C.
What a year in Trimley St Mary feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 609 mm of rain a year
November is the wettest month and May the driest. About 14 days a year bring 10 mm (0.4 in) or more. 25th wettest of 35 Suffolk towns of 2,500+.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Manston
19 air frosts and 8 days of 25°C a year
On about 19 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 8 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 Manston
Manston is 44 miles south of Trimley St Mary, 49 m (161 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 | 7.6°C | 2.5°C | 51 mm | 5.9 | 64 |
| February | 8.0°C | 2.4°C | 41 mm | 5.8 | 82 |
| March | 10.3°C | 3.9°C | 37 mm | 2.7 | 130 |
| April | 13.2°C | 5.8°C | 38 mm | 0.6 | 191 |
| May | 16.3°C | 8.7°C | 50 mm | 0.0 | 224 |
| June | 19.5°C | 11.4°C | 43 mm | 0.0 | 230 |
| July | 22.1°C | 13.7°C | 47 mm | 0.0 | 236 |
| August | 22.2°C | 14.0°C | 51 mm | 0.0 | 214 |
| September | 19.1°C | 11.9°C | 49 mm | 0.0 | 168 |
| October | 15.1°C | 9.1°C | 74 mm | 0.2 | 119 |
| November | 11.0°C | 5.6°C | 72 mm | 1.3 | 76 |
| December | 8.3°C | 3.2°C | 63 mm | 5.1 | 59 |
| Year | 14.4°C | 7.7°C | 615 mm | 22 | 1,793 |
Met Office historic station data, Manston, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Trimley St Mary 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 Suffolk 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 |
|---|---|---|---|
| Trimley St Mary | 22.4°C | 2.6°C | 609 mm |
| Trimley St Martin 1.0 mi | 22.3°C about the same | 2.5°C about the same | 587 mm |
| Felixstowe 1.4 mi | 22.4°C about the same | 2.5°C about the same | 546 mm |
| Kirton 2.0 mi | 22.3°C about the same | 2.4°C about the same | 585 mm |
| Shotley Gate 2.8 mi | 22.7°C about the same | 2.1°C 0.5°C colder | 586 mm |
| Harwich 4.2 mi | 22.7°C about the same | 1.9°C 0.7°C colder | 575 mm |
| Martlesham Heath 6.1 mi | 22.5°C about the same | 2.1°C 0.5°C colder | 618 mm |
Trimley St Mary 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 | 7.9°C 46°F | 2.6°C 37°F | 5.2°C | 52 mm 2.0 in |
| February | 8.3°C 47°F | 2.4°C 36°F | 5.4°C | 44 mm 1.7 in |
| March | 10.6°C 51°F | 3.6°C 38°F | 7.1°C | 42 mm 1.6 in |
| April | 13.6°C 57°F | 5.1°C 41°F | 9.4°C | 44 mm 1.7 in |
| May | 16.9°C 62°F | 8.0°C 46°F | 12.5°C | 41 mm 1.6 in |
| June | 20.0°C 68°F | 10.9°C 52°F | 15.5°C | 49 mm 1.9 in |
| July | 22.4°C 72°F | 13.2°C 56°F | 17.8°C | 59 mm 2.3 in |
| August | 22.4°C 72°F | 13.4°C 56°F | 17.9°C | 55 mm 2.2 in |
| September | 19.6°C 67°F | 11.3°C 52°F | 15.5°C | 48 mm 1.9 in |
| October | 15.4°C 60°F | 8.7°C 48°F | 12.0°C | 56 mm 2.2 in |
| November | 11.3°C 52°F | 5.5°C 42°F | 8.4°C | 61 mm 2.4 in |
| December | 8.4°C 47°F | 3.1°C 38°F | 5.7°C | 60 mm 2.4 in |
| Year | 14.7°C | 7.3°C | 11.0°C | 609 mm |
Where Trimley St Mary’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 Trimley St Mary’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 Manston, 44 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 Trimley St Mary’s climate
How warm does Trimley St Mary get in summer?
July is the warmest month, with average highs of 22.4°C (72°F). About 8 days a year reach 25°C (77°F), fewer than 61% of UK towns.
How cold does Trimley St Mary get in winter?
February nights average 2.4°C (36°F). The air drops below freezing on about 19 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Trimley St Mary get?
About 609 mm (24 in) a year, less than 91% of UK towns. November is the wettest month (61 mm) and May the driest (41 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Manston (44 miles away), averages 1,793 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 Trimley St Mary. 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 Trimley St Mary →
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