Hardly any UK towns collect more rain than Llannon: 1,559 mm (61 in) a year
High summer brings afternoon highs near 19.4°C (67°F). Summers stay cool: July afternoons here are cooler than in 85% of UK towns. The gap between a January night and a July afternoon is 18°C. Keep the boiler serviced for the months from November to April, which average under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in Llannon at a glance
Each month’s typical high and low, in °C.
What a year in Llannon feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,559 mm of rain a year
October is the wettest month and April the driest. About 56 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Aberporth
45 air frosts and 5 days of 25°C a year
On about 45 nights a year the air drops below freezing, and on about 1 days it stays below freezing all day. About 5 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 Aberporth
Aberporth is 33 miles north-west of Llannon, 133 m (436 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 | 7.8°C | 3.4°C | 90 mm | 4.5 | 60 |
| February | 7.9°C | 3.3°C | 67 mm | 3.8 | 79 |
| March | 9.4°C | 4.2°C | 58 mm | 1.8 | 127 |
| April | 11.6°C | 5.7°C | 54 mm | 0.4 | 172 |
| May | 14.3°C | 8.2°C | 55 mm | 0.0 | 210 |
| June | 16.6°C | 10.7°C | 64 mm | 0.0 | 203 |
| July | 18.3°C | 12.5°C | 67 mm | 0.0 | 187 |
| August | 18.3°C | 12.7°C | 75 mm | 0.0 | 169 |
| September | 16.7°C | 11.2°C | 71 mm | 0.0 | 141 |
| October | 13.6°C | 8.9°C | 107 mm | 0.0 | 99 |
| November | 10.5°C | 6.2°C | 117 mm | 0.6 | 59 |
| December | 8.5°C | 4.1°C | 107 mm | 3.5 | 49 |
| Year | 12.8°C | 7.6°C | 931 mm | 15 | 1,554 |
Met Office historic station data, Aberporth, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Llannon 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 Dyfed 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 |
|---|---|---|---|
| Llannon | 19.4°C | 1.7°C | 1,559 mm |
| Tumble 2.6 mi | 19.5°C about the same | 2.3°C 0.6°C milder | 1,610 mm |
| Pontyberem 3.2 mi | 19.6°C about the same | 1.8°C about the same | 1,503 mm |
| Capel Hendre 3.8 mi | 20.2°C 0.8°C warmer | 2.3°C 0.6°C milder | 1,604 mm |
| Cross Hands and Pen-y-groes 3.8 mi | 19.5°C about the same | 2.1°C about the same | 1,678 mm |
| Hendy and Fforest 3.8 mi | 21.0°C 1.6°C warmer | 2.8°C 1.1°C milder | 1,337 mm |
| Llangennech 4.2 mi | 21.0°C 1.6°C warmer | 3.0°C 1.3°C milder | 1,328 mm |
Llannon 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 | 7.2°C 45°F | 1.7°C 35°F | 4.4°C | 168 mm 6.6 in |
| February | 7.5°C 45°F | 1.5°C 35°F | 4.5°C | 116 mm 4.6 in |
| March | 9.4°C 49°F | 2.4°C 36°F | 5.9°C | 105 mm 4.1 in |
| April | 12.3°C 54°F | 4.0°C 39°F | 8.1°C | 92 mm 3.6 in |
| May | 15.4°C 60°F | 6.6°C 44°F | 10.9°C | 94 mm 3.7 in |
| June | 17.7°C 64°F | 9.2°C 49°F | 13.5°C | 101 mm 4.0 in |
| July | 19.4°C 67°F | 11.2°C 52°F | 15.3°C | 114 mm 4.5 in |
| August | 19.1°C 66°F | 11.1°C 52°F | 15.1°C | 132 mm 5.2 in |
| September | 17.1°C 63°F | 9.2°C 49°F | 13.1°C | 123 mm 4.8 in |
| October | 13.5°C 56°F | 6.8°C 44°F | 10.1°C | 172 mm 6.8 in |
| November | 10.1°C 50°F | 4.0°C 39°F | 7.0°C | 171 mm 6.7 in |
| December | 7.7°C 46°F | 2.1°C 36°F | 4.9°C | 172 mm 6.8 in |
| Year | 13.0°C | 5.8°C | 9.4°C | 1,559 mm |
Where Llannon’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 Llannon’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 Aberporth, 33 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 Llannon’s climate
How warm does Llannon get in summer?
July is the warmest month, with average highs of 19.4°C (67°F). About 5 days a year reach 25°C (77°F), fewer than 78% of UK towns.
How cold does Llannon get in winter?
February nights average 1.5°C (35°F). The air drops below freezing on about 45 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Llannon get?
About 1,559 mm (61 in) a year, more than 97% of UK towns. October is the wettest month (172 mm) and April the driest (92 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Aberporth (33 miles away), averages 1,554 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 Llannon. 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 Llannon →
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.