Summer arrives in force in Castledermot, hotter than in 91% of Irish towns
Midwinter brings lows of about 2.1°C. Its January nights bite harder than in 85% of Irish towns. The latest 30-year average runs 0.2°C warmer than 1981–2010’s, with February up the most. An umbrella earns its place on about 143 days a year with 1 mm of rain or more.
Met Éireann 1991–2020 averages for the town’s own square kilometre.
A year in Castledermot at a glance
Each month’s typical high and low, in °C.
What stands out about Castledermot’s climate
Compared with Irish towns, with its place among towns of 2,500+ in County Kildare beside it.
What a year in Castledermot feels like
Typical highs and lows by season and by month, from Met Éireann’s 1991–2020 averages.
35 frosts and 4 days of 25°C a year
Ground frosts, when the grass drops below 0°C, come on about 105 nights a year. Air frosts come mostly from November 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 Oak Park’s daily readings, 2004–2020, 7.2 km south-west of Castledermot: Met Éireann publishes these for its stations only.
About 845 mm of rain a year
October is the wettest month and April the driest. 9th wettest of 15 towns of 2,500+ in County Kildare. The wettest month brings about 1.6 times the rain of the driest. Oak Park records 1 mm or more on about 143 days a year, and 10 mm on about 24.
Rain by month
Millimetres
Heating a home in Castledermot
86% 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 Castledermot’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 Oak Park comes by 18 April and the first by 3 November: about 199 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; Castledermot’s hazards page covers the risks.
Flood & hazards →Met Éireann’s nearest station: Oak Park
Oak Park is 7.2 km south-west of Castledermot, the nearest of the 25 synoptic stations where Met Éireann records the weather around the clock. The station stands 62 m above sea level; Castledermot’s centre, 76 m.
| Month | High | Low | Rain | Air frosts |
|---|---|---|---|---|
| January | 8.3°C | 2.3°C | 79 mm | 7.0 |
| February | 8.6°C | 2.1°C | 65 mm | 7.7 |
| March | 10.5°C | 2.5°C | 64 mm | 6.2 |
| April | 13.3°C | 4.4°C | 48 mm | 1.5 |
| May | 16.1°C | 6.9°C | 49 mm | 0.3 |
| June | 18.8°C | 9.6°C | 63 mm | 0.0 |
| July | 20.4°C | 11.5°C | 70 mm | 0.0 |
| August | 19.7°C | 11.2°C | 83 mm | 0.0 |
| September | 17.8°C | 9.3°C | 66 mm | 0.1 |
| October | 14.3°C | 7.0°C | 94 mm | 0.6 |
| November | 10.4°C | 4.1°C | 92 mm | 4.4 |
| December | 8.5°C | 2.6°C | 93 mm | 7.6 |
| Year | 13.9°C | 6.1°C | 864 mm | 35 |
The table is Oak Park’s own record, averaged over 2004–2020 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 Castledermot itself; the frosts and degree days are this station’s.
How Castledermot 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 Kildare.
Warmer than it used to be
Castledermot’s 1991–2020 average is 0.2°C warmer than 1981–2010’s. The biggest change is in February (+0.4°C).
A year’s rain is 845 mm, up 2% from 832 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.
Castledermot and its neighbours
Every town next door is within half a degree of Castledermot 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 |
|---|---|---|---|
| Castledermot | 20.2°C | 2.1°C | 845 mm |
| Carlow 9.7 km | 20.3°C about the same | 2.3°C about the same | 892 mm |
| Baltinglass 9.9 km | 19.9°C about the same | 1.9°C about the same | 1,035 mm |
| Rathvilly 10 km | 19.9°C about the same | 1.9°C about the same | 953 mm |
| Athy 13 km | 20.4°C about the same | 2.2°C about the same | 835 mm |
| Tullow 14 km | 20.2°C about the same | 2.2°C about the same | 883 mm |
| Ballylinan 14 km | 20.1°C about the same | 2.0°C about the same | 937 mm |
Each town’s colour is Met Éireann’s 1 km grid at its own centre, so towns a few kilometres apart can differ.
Castledermot 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 | 8.3°C | 2.1°C | 5.2°C | 76 mm |
| February | 8.9°C | 2.0°C | 5.5°C | 61 mm |
| March | 10.7°C | 3.0°C | 6.8°C | 57 mm |
| April | 13.2°C | 4.4°C | 8.8°C | 56 mm |
| May | 16.0°C | 6.9°C | 11.4°C | 57 mm |
| June | 18.6°C | 9.6°C | 14.1°C | 65 mm |
| July | 20.2°C | 11.5°C | 15.8°C | 64 mm |
| August | 19.9°C | 11.2°C | 15.5°C | 74 mm |
| September | 17.7°C | 9.3°C | 13.5°C | 68 mm |
| October | 14.1°C | 6.7°C | 10.4°C | 93 mm |
| November | 10.7°C | 3.9°C | 7.3°C | 88 mm |
| December | 8.6°C | 2.3°C | 5.5°C | 86 mm |
| Year | 13.9°C | 6.1°C | 10.0°C | 845 mm |
How much a month can swing
December swings the most: over 17 years its average ranged from −0.8°C (2010) to 8.6°C (2015). May is the most reliable, staying within 2.4°C.
Where Castledermot’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 Castledermot’s population centre (0.3 km away).
- Weather station: the nearest of Met Éireann’s 25 synoptic stations, Oak Park, 7.2 km south-west, from Met Éireann’s station list.
- Frosts and degree days: Oak Park’s daily readings from Met Éireann (clidata.met.ie), 2004–2020, 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 Castledermot’s climate
How warm does Castledermot get in summer?
July is the warmest month, with average highs of 20.2°C.
How cold does Castledermot get in winter?
The coldest nights come in February, averaging 2.0°C. At Oak Park, the nearest Met Éireann station, the air drops below 0°C on about 35 nights a year (2004–2020).
How much rain does Castledermot get?
About 845 mm a year, less than 64% of Irish towns. October is the wettest month (93 mm) and April the driest (56 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 Castledermot itself. Its nearest synoptic station is Oak Park.
Are these figures for Castledermot itself?
Partly. The temperatures and rain are Met Éireann’s 1991–2020 averages on its 1 km grid, read at Castledermot’s population centre; the frosts, degree days and year-to-year swings are those of Oak Park, 7.2 km south-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 Castledermot’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 Castledermot →
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).