Few Irish towns have colder winter nights than Blacklion
Midsummer highs settle at about 18.6°C. Seasons differ by 17°C, from the coldest nights to the warmest afternoons. In July, afternoons here are cooler than in 98% of Irish towns. Warm coats and heating bills mark the months from October to April, when means dip under 10°C.
Met Éireann 1991–2020 averages for the town’s own square kilometre.
A year in Blacklion at a glance
Each month’s typical high and low, in °C.
What stands out about Blacklion’s climate
Compared with Irish towns, with its place among towns of 2,500+ in County Cavan beside it.
What a year in Blacklion feels like
Typical highs and lows by season and by month, from Met Éireann’s 1991–2020 averages.
About 1,338 mm of rain a year
December is the wettest month and May the driest. The wettest of 6 towns of 2,500+ in County Cavan. The wettest month brings about 1.8 times the rain of the driest.
Rain by month
Millimetres
Living with Blacklion’s climate
What the averages mean for a garden, a free afternoon and a bad-weather day.
Highs of 17–27°C with lows of 8°C or more: Jun, Jul and Aug.
Parks & trails →Averages smooth over storms, floods and heatwaves; Blacklion’s hazards page covers the risks.
Flood & hazards →Met Éireann’s nearest station: Finner
Finner is 33 km north-west of Blacklion, the nearest of the 25 synoptic stations where Met Éireann records the weather around the clock.
| Distance from the town | 33 km north-west |
| Station altitude | 33 m |
| Town altitude (its centre) | 55 m |
The figures on this page are not this station’s readings: they are Met Éireann’s 1 km grid at Blacklion itself, which it builds from its whole network of stations.
How Blacklion compares
Against the 321 Irish towns and city neighbourhoods of 2,500 or more, each read from Met Éireann’s grid at its own centre, and its place among towns of 2,500+ in County Cavan.
Warmer than it used to be
Blacklion’s 1991–2020 average is 0.3°C warmer than 1981–2010’s. The biggest change is in February (+0.4°C).
A year’s rain is 1,338 mm, up 6% from 1,257 mm.
Change by month
The two periods share 1991–2010, so the gap is a decade’s step, not the change between two separate 30-year periods.
Blacklion weather by month
Average daily high and low, mean temperature and rain, 1991–2020, for the town itself (Met Éireann’s 1 km grid).
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 7.2°C | 1.4°C | 4.3°C | 137 mm |
| February | 8.0°C | 1.3°C | 4.7°C | 115 mm |
| March | 9.7°C | 2.3°C | 6.0°C | 102 mm |
| April | 12.2°C | 3.8°C | 8.0°C | 83 mm |
| May | 15.1°C | 6.2°C | 10.6°C | 82 mm |
| June | 17.4°C | 8.9°C | 13.2°C | 85 mm |
| July | 18.6°C | 10.7°C | 14.6°C | 103 mm |
| August | 18.3°C | 10.5°C | 14.4°C | 114 mm |
| September | 16.4°C | 8.6°C | 12.5°C | 99 mm |
| October | 12.9°C | 5.9°C | 9.4°C | 130 mm |
| November | 9.6°C | 3.4°C | 6.5°C | 138 mm |
| December | 7.5°C | 1.6°C | 4.6°C | 149 mm |
| Year | 12.7°C | 5.4°C | 9.1°C | 1,338 mm |
Where Blacklion’s numbers come from
Averages over 30 years, not a forecast: the town’s own from Met Éireann’s grid, the frosts and degree days from its nearest station.
- Temperature and rain: Met Éireann’s 1991–2020 averages on its 1 km grid (Climatological Notes 22 and 23), read at the grid point nearest Blacklion’s population centre (1.0 km away).
- Weather station: the nearest of Met Éireann’s 25 synoptic stations, Finner, 33 km north-west, from Met Éireann’s station list.
- Frosts and degree days: Finner’s daily readings from Met Éireann (clidata.met.ie), 2011–2020, averaged by month: a month counts when 27 or more of its days were read (rain and sunshine: every day), and a figure needs 10 such years.
- Then and now: Met Éireann’s 1981–2010 averages on the same 1 km grid, at the same point.
- Altitudes: the town’s ground from the Copernicus GLO-30 surface model (a few metres high in built-up places), the station’s from Met Éireann.
- Comparisons: every Irish town and city neighbourhood of 2,500 or more, read the same way; the five city totals are left out.
- Not on this page: sunshine at this station, snow and wind. Met Éireann publishes none of them on a grid; the frosts here are its nearest station’s, not the town’s own.
Met Éireann 30-year averages · Met Éireann open data. Under Creative Commons Attribution 4.0 (CC BY 4.0).
Questions about Blacklion’s climate
How warm does Blacklion get in summer?
July is the warmest month, with average highs of 18.6°C.
How cold does Blacklion get in winter?
The coldest nights come in February, averaging 1.3°C. Met Éireann counts frosts only at its weather stations, so there is no frost count for the town itself.
How much rain does Blacklion get?
About 1,338 mm a year, more than 96% of Irish towns. December is the wettest month (149 mm) and May the driest (82 mm).
How sunny is it?
Met Éireann publishes its 1991–2020 sunshine averages for its weather stations only, not on the 1 km grid this page reads, so there is no sunshine figure for Blacklion itself. Its nearest synoptic station is Finner.
Are these figures for Blacklion itself?
Partly. The temperatures and rain are Met Éireann’s 1991–2020 averages on its 1 km grid, read at Blacklion’s population centre; the frosts, degree days and year-to-year swings are those of Finner, 33 km north-west, the nearest of its synoptic stations.
Where do these figures come from?
Met Éireann’s 1991–2020 climate averages, published as maps of Ireland in 1 km squares (Climatological Notes 22 and 23); the page reads the square at Blacklion’s population centre. They are 30-year averages, not a forecast.
Copyright Met Éireann. Source: www.met.ie. This data is published under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Met Éireann does not accept any liability whatsoever for any error or omission in the data, their availability, or for any loss or damage arising from their use. This material has been modified from the original: TownRatings reads the 1 km grid at each town’s population centre. Today’s forecast for Blacklion →
Contains Central Statistics Office (CSO) data, Census 2022, and Tailte Éireann boundaries (CSO Urban Areas, Small Areas, local electoral areas, constituencies), under Creative Commons Attribution 4.0 (CC BY 4.0).