Photo: Oliver Dixon · CC BY-SA 2.0Few Irish towns have colder winter nights than Clonaslee
In July the day’s top temperature is typically 19.8°C. November is the wettest month, May the driest. It is the wettest of its 4 nearest neighbours. Waterproofs come out on about 166 days a year, each with 1 mm of rain or more.
Met Éireann 1991–2020 averages for the town’s own square kilometre.
A year in Clonaslee at a glance
Each month’s typical high and low, in °C.
What stands out about Clonaslee’s climate
Compared with Irish towns, with its place among towns of 2,500+ in County Laois beside it.
What a year in Clonaslee feels like
Typical highs and lows by season and by month, from Met Éireann’s 1991–2020 averages.
41 frosts and 3 days of 25°C a year
Ground frosts, when the grass drops below 0°C, come on about 103 nights a year. Air frosts come mostly from October to April, most of all in March (about 8).
Air frosts by month
Average nights below 0°C
Ground frosts by month
Average nights with the grass below 0°C
Counted from Gurteen’s daily readings, 2008–2020, 35 km west of Clonaslee: Met Éireann publishes these for its stations only. At that distance, read them as the area’s climate.
About 1,074 mm of rain a year
November is the wettest month and May the driest. The wettest of 4 towns of 2,500+ in County Laois. The wettest month brings about 1.6 times the rain of the driest. Gurteen records 1 mm or more on about 166 days a year, and 10 mm on about 23.
Rain by month
Millimetres
Heating a home in Clonaslee
84% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
Degree days add up how far each day’s mean temperature falls below 15.5°C over a year.
Living with Clonaslee’s climate
What the averages mean for a garden, a free afternoon and a bad-weather day.
In half of years the last air frost at Gurteen comes by 28 April and the first by 25 October: about 180 frost-free days in between.
Highs of 17–27°C with lows of 8°C or more: Jun, Jul, Aug and Sep.
Parks & trails →Averages smooth over storms, floods and heatwaves; Clonaslee’s hazards page covers the risks.
Flood & hazards →Met Éireann’s nearest station: Gurteen
Gurteen is 35 km west of Clonaslee, the nearest of the 25 synoptic stations where Met Éireann records the weather around the clock. The station stands 75 m above sea level; Clonaslee’s centre, 117 m.
| Month | High | Low | Rain | Air frosts |
|---|---|---|---|---|
| January | 7.9°C | 2.0°C | 87 mm | 7.3 |
| February | 8.5°C | 1.9°C | 74 mm | 7.6 |
| March | 10.2°C | 1.9°C | 73 mm | 8.3 |
| April | 13.1°C | 3.7°C | 54 mm | 3.3 |
| May | 15.8°C | 6.4°C | 60 mm | 0.6 |
| June | 18.3°C | 9.0°C | 74 mm | 0.0 |
| July | 19.4°C | 11.1°C | 78 mm | 0.0 |
| August | 18.6°C | 10.7°C | 90 mm | 0.0 |
| September | 16.8°C | 8.8°C | 70 mm | 0.1 |
| October | 13.7°C | 6.4°C | 91 mm | 1.2 |
| November | 10.0°C | 3.6°C | 106 mm | 4.9 |
| December | 8.2°C | 2.2°C | 98 mm | 8.0 |
| Year | 13.4°C | 5.6°C | 954 mm | 41 |
The table is Gurteen’s own record, averaged over 2008–2020 from its daily readings (ours, not a Met Éireann table). The temperatures and rain elsewhere on this page are Met Éireann’s 1 km grid at Clonaslee itself; the frosts and degree days are this station’s.
How Clonaslee 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 Laois.
Warmer than it used to be
Clonaslee’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 1,074 mm, up 2% from 1,058 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.
Clonaslee and its neighbours
Every town next door is within half a degree of Clonaslee in January and July. Choose a measure to recolour the map; tap a town for its climate.
The towns next door, side by side
The nearest towns of 1,000+ within 19 km: a hill, a valley or the sea can make a real difference over a short distance.
| Town | July high | January low | Rain a year |
|---|---|---|---|
| Clonaslee | 19.8°C | 1.8°C | 1,074 mm |
| Kilcormac 13 km | 20.0°C about the same | 2.1°C about the same | 885 mm |
| Mountmellick 14 km | 20.1°C about the same | 2.0°C about the same | 940 mm |
| Tullamore 14 km | 20.0°C about the same | 2.1°C about the same | 897 mm |
| Mountrath 17 km | 19.9°C about the same | 1.9°C about the same | 1,010 mm |
Each town’s colour is Met Éireann’s 1 km grid at its own centre, so towns a few kilometres apart can differ.
Clonaslee 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 | 7.9°C | 1.8°C | 4.8°C | 113 mm |
| February | 8.6°C | 1.7°C | 5.2°C | 88 mm |
| March | 10.5°C | 2.7°C | 6.6°C | 79 mm |
| April | 13.1°C | 4.1°C | 8.6°C | 75 mm |
| May | 15.9°C | 6.5°C | 11.2°C | 72 mm |
| June | 18.5°C | 9.2°C | 13.9°C | 77 mm |
| July | 19.8°C | 11.1°C | 15.5°C | 76 mm |
| August | 19.4°C | 10.9°C | 15.2°C | 82 mm |
| September | 17.3°C | 8.9°C | 13.1°C | 78 mm |
| October | 13.7°C | 6.3°C | 10.0°C | 110 mm |
| November | 10.2°C | 3.6°C | 6.9°C | 115 mm |
| December | 8.1°C | 2.0°C | 5.0°C | 111 mm |
| Year | 13.6°C | 5.7°C | 9.7°C | 1,074 mm |
How much a month can swing
December swings the most: over 13 years its average ranged from −0.4°C (2010) to 8.3°C (2015). September is the most reliable, staying within 2.2°C.
Where Clonaslee’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 Clonaslee’s population centre (0.5 km away).
- Weather station: the nearest of Met Éireann’s 25 synoptic stations, Gurteen, 35 km west, from Met Éireann’s station list.
- Frosts and degree days: Gurteen’s daily readings from Met Éireann (clidata.met.ie), 2008–2020, 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 Clonaslee’s climate
How warm does Clonaslee get in summer?
The warmest month is July, when afternoons average 19.8°C.
How cold does Clonaslee get in winter?
February nights average 1.7°C, the coldest of the year. At Gurteen, the nearest Met Éireann station, the air drops below 0°C on about 41 nights a year (2008–2020).
How much rain does Clonaslee get?
About 1,074 mm a year, more than 67% of Irish towns. November is the wettest month (115 mm) and May the driest (72 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 Clonaslee itself. Its nearest synoptic station is Gurteen.
Are these figures for Clonaslee itself?
Partly. The temperatures and rain are Met Éireann’s 1991–2020 averages on its 1 km grid, read at Clonaslee’s population centre; the frosts, degree days and year-to-year swings are those of Gurteen, 35 km 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 Clonaslee’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 Clonaslee →
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).