Few Irish towns have cooler summers than Claremorris
On a normal January night the air cools to about 2.1°C. By rainfall alone, it ranks wetter than 93% of Irish towns. April has warmed most since 1981–2010, part of a 0.3°C rise. Picnics, hikes and garden evenings come into their own from June to August, with highs of 18–19°C.
Met Éireann 1991–2020 averages for the town’s own square kilometre.
A year in Claremorris at a glance
Each month’s typical high and low, in °C.
What stands out about Claremorris’s climate
Compared with Irish towns, with its place among towns of 2,500+ in County Mayo beside it.
What a year in Claremorris feels like
Typical highs and lows by season and by month, from Met Éireann’s 1991–2020 averages.
36 frosts and 3 days of 25°C a year
Ground frosts, when the grass drops below 0°C, come on about 92 nights a year. Air frosts come mostly from October to April, most of all in February (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 Claremorris’s daily readings, 1991–2020, 1.8 km south of Claremorris: Met Éireann publishes these for its stations only.
About 1,284 mm of rain a year
December is the wettest month and May the driest. 4th wettest of 6 towns of 2,500+ in County Mayo. The wettest month brings about 1.8 times the rain of the driest. Claremorris records 1 mm or more on about 193 days a year, and 10 mm on about 38.
Rain by month
Millimetres
Heating a home in Claremorris
83% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Degree days add up how far each day’s mean temperature falls below 15.5°C over a year.
Living with Claremorris’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 Claremorris comes by 17 April and the first by 4 November: about 201 frost-free days in between.
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; Claremorris’s hazards page covers the risks.
Flood & hazards →Met Éireann’s nearest station: Claremorris
Claremorris is 1.8 km south of Claremorris, the nearest of the 25 synoptic stations where Met Éireann records the weather around the clock. The station stands 68 m above sea level; Claremorris’s centre, 75 m.
| Month | High | Low | Rain | Air frosts |
|---|---|---|---|---|
| January | 8.0°C | 2.3°C | 140 mm | 7.4 |
| February | 8.5°C | 1.9°C | 111 mm | 8.4 |
| March | 10.3°C | 2.9°C | 98 mm | 5.5 |
| April | 12.9°C | 4.2°C | 79 mm | 2.2 |
| May | 15.5°C | 6.4°C | 69 mm | 0.5 |
| June | 17.6°C | 9.1°C | 73 mm | 0.0 |
| July | 18.8°C | 10.8°C | 93 mm | 0.0 |
| August | 18.6°C | 10.6°C | 103 mm | 0.0 |
| September | 16.8°C | 8.8°C | 90 mm | 0.1 |
| October | 13.5°C | 6.2°C | 120 mm | 1.0 |
| November | 10.3°C | 4.0°C | 135 mm | 3.8 |
| December | 8.0°C | 2.5°C | 138 mm | 6.7 |
| Year | 13.2°C | 5.8°C | 1,250 mm | 36 |
The table is Claremorris’s own record, averaged over 1991–2020 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 Claremorris itself; the frosts and degree days are this station’s.
How Claremorris 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 Mayo.
Warmer than it used to be
Claremorris’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 1,284 mm, up 3% from 1,248 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.
Claremorris and its neighbours
Ballinrobe has the warmest July afternoons (19.2°C, 0.5°C warmer). 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 |
|---|---|---|---|
| Claremorris | 18.7°C | 2.1°C | 1,284 mm |
| Knock 9.5 km | 18.6°C about the same | 2.0°C about the same | 1,308 mm |
| Kiltimagh 14 km | 18.8°C about the same | 2.3°C about the same | 1,322 mm |
| Ballyhaunis 16 km | 18.8°C about the same | 2.0°C about the same | 1,284 mm |
| Ballinrobe 19 km | 19.2°C 0.5°C warmer | 2.6°C 0.5°C milder | 1,344 mm |
Each town’s colour is Met Éireann’s 1 km grid at its own centre, so towns a few kilometres apart can differ.
Claremorris 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 | 2.1°C | 5.0°C | 136 mm |
| February | 8.6°C | 2.0°C | 5.3°C | 112 mm |
| March | 10.2°C | 3.0°C | 6.6°C | 98 mm |
| April | 12.8°C | 4.4°C | 8.6°C | 80 mm |
| May | 15.5°C | 6.7°C | 11.1°C | 79 mm |
| June | 17.6°C | 9.3°C | 13.4°C | 81 mm |
| July | 18.7°C | 11.1°C | 14.9°C | 92 mm |
| August | 18.5°C | 11.0°C | 14.8°C | 102 mm |
| September | 16.7°C | 9.1°C | 12.9°C | 95 mm |
| October | 13.4°C | 6.5°C | 9.9°C | 126 mm |
| November | 10.2°C | 4.1°C | 7.2°C | 142 mm |
| December | 8.2°C | 2.4°C | 5.3°C | 143 mm |
| Year | 13.2°C | 6.0°C | 9.6°C | 1,284 mm |
How much a month can swing
December swings the most: over 30 years its average ranged from −0.4°C (2010) to 7.4°C (2018). April is the most reliable, staying within 4.0°C.
Where Claremorris’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 Claremorris’s population centre (0.4 km away).
- Weather station: the nearest of Met Éireann’s 25 synoptic stations, Claremorris, 1.8 km south, from Met Éireann’s station list.
- Frosts and degree days: Claremorris’s daily readings from Met Éireann (clidata.met.ie), 1991–2020, 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 Claremorris’s climate
How warm does Claremorris get in summer?
July is the warmest month, with average highs of 18.7°C.
How cold does Claremorris get in winter?
The coldest nights come in February, averaging 2.0°C. At Claremorris, the nearest Met Éireann station, the air drops below 0°C on about 36 nights a year (1991–2020).
How much rain does Claremorris get?
About 1,284 mm a year, more than 93% of Irish towns. December is the wettest month (143 mm) and May the driest (79 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 Claremorris itself. Its nearest synoptic station is Claremorris.
Are these figures for Claremorris itself?
Partly. The temperatures and rain are Met Éireann’s 1991–2020 averages on its 1 km grid, read at Claremorris’s population centre; the frosts, degree days and year-to-year swings are those of Claremorris, 1.8 km south, 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 Claremorris’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 Claremorris →
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).