Few UK towns get more frosts than Castle Douglas
Sunny July days climb to about 18.9°C (66°F). Of the 10 Dumfries and Galloway towns, it is the wettest. Only 18°C separates winter nights from summer afternoons. Long walks are most pleasant from June to August, when afternoons reach 18–19°C.
Met Office 1991–2020 averages for the town itself.
A year in Castle Douglas at a glance
Each month’s typical high and low, in °C.
What a year in Castle Douglas feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,395 mm of rain a year
December is the wettest month and May the driest. About 45 days a year bring 10 mm (0.4 in) or more. The wettest of 10 Dumfries and Galloway towns of 2,500+.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Eskdalemuir
A frosty town: 57 air frosts and 4 days of 25°C a year
On about 57 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 4 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 Eskdalemuir
Eskdalemuir is 38 miles north-east of Castle Douglas, 242 m (794 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 | 5.2°C | −0.1°C | 208 mm | 14.4 | 37 |
| February | 5.9°C | −0.2°C | 170 mm | 13.7 | 59 |
| March | 7.8°C | 0.8°C | 147 mm | 11.9 | 84 |
| April | 10.8°C | 2.4°C | 102 mm | 7.5 | 129 |
| May | 14.1°C | 4.8°C | 103 mm | 3.8 | 162 |
| June | 16.4°C | 7.9°C | 111 mm | 0.2 | 132 |
| July | 18.2°C | 9.6°C | 130 mm | 0.0 | 131 |
| August | 17.7°C | 9.5°C | 145 mm | 0.1 | 123 |
| September | 15.3°C | 7.4°C | 132 mm | 0.7 | 97 |
| October | 11.7°C | 4.8°C | 185 mm | 4.3 | 69 |
| November | 8.0°C | 2.0°C | 190 mm | 9.3 | 48 |
| December | 5.5°C | −0.2°C | 206 mm | 13.8 | 37 |
| Year | 11.4°C | 4.1°C | 1,829 mm | 80 | 1,107 |
Met Office historic station data, Eskdalemuir, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Castle Douglas 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 Dumfries and Galloway 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 |
|---|---|---|---|
| Castle Douglas | 18.9°C | 1.3°C | 1,395 mm |
| Dalbeattie 4.3 mi | 18.6°C about the same | 1.3°C about the same | 1,389 mm |
| Kirkcudbright 8.7 mi | 19.6°C 0.8°C warmer | 1.6°C about the same | 1,295 mm |
Castle Douglas 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 | 6.6°C 44°F | 1.3°C 34°F | 4.0°C | 142 mm 5.6 in |
| February | 7.2°C 45°F | 1.4°C 34°F | 4.3°C | 119 mm 4.7 in |
| March | 9.0°C 48°F | 2.1°C 36°F | 5.8°C | 109 mm 4.3 in |
| April | 12.2°C 54°F | 4.2°C 39°F | 8.1°C | 82 mm 3.2 in |
| May | 15.3°C 60°F | 6.2°C 43°F | 10.8°C | 77 mm 3.0 in |
| June | 17.5°C 64°F | 9.4°C 49°F | 13.5°C | 84 mm 3.3 in |
| July | 18.9°C 66°F | 11.2°C 52°F | 15.2°C | 95 mm 3.7 in |
| August | 18.6°C 65°F | 11.0°C 52°F | 14.8°C | 112 mm 4.4 in |
| September | 16.4°C 62°F | 8.8°C 48°F | 12.7°C | 104 mm 4.1 in |
| October | 13.0°C 55°F | 6.2°C 43°F | 9.5°C | 152 mm 6.0 in |
| November | 9.2°C 49°F | 3.4°C 38°F | 6.3°C | 157 mm 6.2 in |
| December | 7.0°C 45°F | 1.1°C 34°F | 4.0°C | 163 mm 6.4 in |
| Year | 12.6°C | 5.5°C | 9.1°C | 1,395 mm |
Where Castle Douglas’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 Castle Douglas’s locality.
- 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 Eskdalemuir, 38 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 Castle Douglas’s climate
How warm does Castle Douglas get in summer?
July is the warmest month, with average highs of 18.9°C (66°F). About 4 days a year reach 25°C (77°F), fewer than 83% of UK towns.
How cold does Castle Douglas get in winter?
December nights average 1.1°C (34°F). The air drops below freezing on about 57 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Castle Douglas get?
About 1,395 mm (55 in) a year, more than 95% of UK towns. December is the wettest month (163 mm) and May the driest (77 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Eskdalemuir (38 miles away), averages 1,107 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 Castle Douglas. 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 Castle Douglas →
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.