Photo: Alan Hughes · CC BY-SA 2.0More rain falls on St Nicholas than on 88% of UK towns: 1,166 mm (46 in) a year
High summer brings afternoon highs near 21.4°C (70°F). Rain peaks in December and eases off in April. Frosty nights outnumber those of 64% of UK towns. Gritters and ice scrapers earn their keep on roughly 44 nights a year below 0°C.
Met Office 1991–2020 averages for the town itself.
A year in St Nicholas at a glance
Each month’s typical high and low, in °C.
What a year in St Nicholas feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,166 mm of rain a year
December is the wettest month and April the driest. About 39 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
44 air frosts and 9 days of 25°C a year
On about 44 nights a year the air drops below freezing, and on about 1 days it stays below freezing all day. About 9 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 Cardiff Bute Park
Cardiff Bute Park is 5.7 miles east of St Nicholas, 9 m (30 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 |
|---|---|---|---|---|
| January | 8.6°C | 2.5°C | 127 mm | 8.1 |
| February | 9.1°C | 2.5°C | 93 mm | 7.5 |
| March | 11.3°C | 3.9°C | 85 mm | 3.9 |
| April | 14.4°C | 5.7°C | 72 mm | 1.4 |
| May | 17.4°C | 8.5°C | 78 mm | 0.0 |
| June | 20.1°C | 11.3°C | 73 mm | 0.0 |
| July | 21.8°C | 13.1°C | 84 mm | 0.0 |
| August | 21.4°C | 12.9°C | 105 mm | 0.0 |
| September | 19.1°C | 10.7°C | 87 mm | 0.0 |
| October | 15.2°C | 8.0°C | 128 mm | 1.0 |
| November | 11.6°C | 4.9°C | 131 mm | 3.7 |
| December | 9.1°C | 2.9°C | 140 mm | 8.3 |
| Year | 14.9°C | 7.2°C | 1,201 mm | 34 |
Met Office historic station data, Cardiff Bute Park, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Campbell-Stokes recorder.
How St Nicholas 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 South Glamorgan 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 |
|---|---|---|---|
| St Nicholas | 21.4°C | 1.8°C | 1,166 mm |
| Wenvoe 2.2 mi | 21.0°C about the same | 2.6°C 0.8°C milder | 1,164 mm |
| Barry 4.1 mi | 21.4°C about the same | 2.8°C 0.9°C milder | 1,004 mm |
| Creigiau 4.3 mi | 20.9°C about the same | 1.7°C about the same | 1,433 mm |
| Dinas Powis 4.7 mi | 21.0°C about the same | 2.7°C 0.9°C milder | 1,164 mm |
| Pentyrch 4.8 mi | 21.1°C about the same | 1.7°C about the same | 1,454 mm |
| Rhoose 5.2 mi | 21.2°C about the same | 2.8°C 1.0°C milder | 991 mm |
St Nicholas 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 | 7.6°C 46°F | 1.8°C 35°F | 4.7°C | 126 mm 5.0 in |
| February | 8.4°C 47°F | 2.0°C 36°F | 5.1°C | 86 mm 3.4 in |
| March | 10.7°C 51°F | 3.3°C 38°F | 7.0°C | 81 mm 3.2 in |
| April | 13.8°C 57°F | 4.9°C 41°F | 9.3°C | 69 mm 2.7 in |
| May | 17.0°C 63°F | 7.7°C 46°F | 12.3°C | 71 mm 2.8 in |
| June | 19.6°C 67°F | 10.6°C 51°F | 15.1°C | 73 mm 2.9 in |
| July | 21.4°C 70°F | 12.5°C 54°F | 16.9°C | 82 mm 3.2 in |
| August | 21.0°C 70°F | 12.3°C 54°F | 16.6°C | 99 mm 3.9 in |
| September | 18.6°C 65°F | 10.3°C 50°F | 14.4°C | 88 mm 3.4 in |
| October | 14.6°C 58°F | 7.6°C 46°F | 11.1°C | 129 mm 5.1 in |
| November | 10.8°C 52°F | 4.5°C 40°F | 7.6°C | 129 mm 5.1 in |
| December | 8.3°C 47°F | 2.4°C 36°F | 5.3°C | 135 mm 5.3 in |
| Year | 14.3°C | 6.6°C | 10.4°C | 1,166 mm |
Where St Nicholas’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 St Nicholas’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 Cardiff Bute Park, 5.7 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 St Nicholas’s climate
How warm does St Nicholas get in summer?
July is the warmest month, with average highs of 21.4°C (70°F). About 9 days a year reach 25°C (77°F), fewer than 56% of UK towns.
How cold does St Nicholas get in winter?
January nights average 1.8°C (35°F). The air drops below freezing on about 44 nights a year, and about 1 days a year stay below freezing all day.
How much rain does St Nicholas get?
About 1,166 mm (46 in) a year, more than 88% of UK towns. December is the wettest month (135 mm) and April the driest (69 mm).
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 St Nicholas. 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 St Nicholas →
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