Castlegregory sits near the top of Irish towns for mild winters
On a normal July day the thermometer tops out near 18.8°C. A year here swings 14°C from midwinter lows to midsummer highs. Its July afternoons stay fresher than in 97% of Irish towns. Gritters and ice scrapers earn their keep on roughly 8 nights a year below 0°C.
Met Éireann 1991–2020 averages for the town’s own square kilometre.
A year in Castlegregory at a glance
Each month’s typical high and low, in °C.
What stands out about Castlegregory’s climate
Compared with Irish towns, with its place among towns of 2,500+ in County Kerry beside it.
What a year in Castlegregory feels like
Typical highs and lows by season and by month, from Met Éireann’s 1991–2020 averages.
About 8 air frosts a year
Ground frosts, when the grass drops below 0°C, come on about 40 nights a year. Air frosts come mostly from December to March, most of all in January (about 2).
Air frosts by month
Average nights below 0°C
Ground frosts by month
Average nights with the grass below 0°C
Counted from Valentia’s daily readings, 1991–2020, 38 km south-west of Castlegregory: Met Éireann publishes these for its stations only. At that distance, read them as the area’s climate.
About 1,354 mm of rain a year
November is the wettest month and May the driest. 3rd wettest of 6 towns of 2,500+ in County Kerry. The wettest month brings about 2.2 times the rain of the driest. Valentia records 1 mm or more on about 205 days a year, and 10 mm on about 53.
Rain by month
Millimetres
Sunshine by month
Hours, at Valentia
Heating a home in Castlegregory
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 Castlegregory’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 Valentia comes by 8 March and the first by 3 December: about 270 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; Castlegregory’s hazards page covers the risks.
Flood & hazards →Met Éireann’s nearest station: Valentia
Valentia is 38 km south-west of Castlegregory, the nearest of the 25 synoptic stations where Met Éireann records the weather around the clock. The station stands 24 m above sea level; Castlegregory’s centre, 20 m.
| Month | High | Low | Rain | Air frosts | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.9°C | 5.0°C | 184 mm | 2.0 | 52 |
| February | 10.0°C | 4.9°C | 137 mm | 1.9 | 70 |
| March | 11.0°C | 5.3°C | 114 mm | 1.4 | 118 |
| April | 12.6°C | 6.4°C | 104 mm | 0.2 | 165 |
| May | 14.8°C | 8.6°C | 92 mm | 0.0 | 179 |
| June | 16.7°C | 10.8°C | 100 mm | 0.0 | 168 |
| July | 17.9°C | 12.7°C | 113 mm | 0.0 | 137 |
| August | 18.0°C | 12.5°C | 114 mm | 0.0 | 134 |
| September | 17.0°C | 11.2°C | 126 mm | 0.0 | 117 |
| October | 14.5°C | 9.1°C | 171 mm | 0.0 | 91 |
| November | 11.9°C | 6.9°C | 187 mm | 0.5 | 56 |
| December | 10.5°C | 5.7°C | 176 mm | 1.8 | 40 |
| Year | 13.7°C | 8.3°C | 1,617 mm | 8 | 1,327 |
The table is Valentia’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 Castlegregory itself; the frosts, sunshine and degree days are this station’s.
How Castlegregory 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 Kerry.
Warmer than it used to be
Castlegregory’s 1991–2020 average is 0.2°C warmer than 1981–2010’s. The biggest change is in February (+0.3°C).
A year’s rain, 1,354 mm, is about the same as before.
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.
Castlegregory 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 | 10.0°C | 4.9°C | 7.4°C | 161 mm |
| February | 10.2°C | 4.7°C | 7.5°C | 122 mm |
| March | 11.4°C | 5.3°C | 8.4°C | 102 mm |
| April | 13.3°C | 6.5°C | 9.9°C | 84 mm |
| May | 15.6°C | 8.7°C | 12.1°C | 74 mm |
| June | 17.4°C | 11.1°C | 14.3°C | 75 mm |
| July | 18.8°C | 12.9°C | 15.8°C | 79 mm |
| August | 18.8°C | 12.9°C | 15.9°C | 89 mm |
| September | 17.6°C | 11.6°C | 14.6°C | 100 mm |
| October | 14.7°C | 9.4°C | 12.1°C | 142 mm |
| November | 12.0°C | 7.0°C | 9.5°C | 166 mm |
| December | 10.5°C | 5.5°C | 8.0°C | 159 mm |
| Year | 14.2°C | 8.4°C | 11.3°C | 1,354 mm |
How much a month can swing
December swings the most: over 30 years its average ranged from 3.6°C (2010) to 10.0°C (2015). June is the most reliable, staying within 3.0°C.
Where Castlegregory’s numbers come from
Averages over 30 years, not a forecast: the town’s own from Met Éireann’s grid, the frosts, sunshine 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 Castlegregory’s population centre (0.4 km away).
- Weather station: the nearest of Met Éireann’s 25 synoptic stations, Valentia, 38 km south-west, from Met Éireann’s station list.
- Frosts, sunshine, degree days: Valentia’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: snow and wind. Met Éireann publishes neither on a grid; the frosts and sunshine 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 Castlegregory’s climate
How warm does Castlegregory get in summer?
The warmest month is July, when afternoons average 18.8°C.
How cold does Castlegregory get in winter?
February nights average 4.7°C, the coldest of the year. At Valentia, the nearest Met Éireann station, the air drops below 0°C on about 8 nights a year (1991–2020).
How much rain does Castlegregory get?
About 1,354 mm a year, more than 97% of Irish towns. November is the wettest month (166 mm) and May the driest (74 mm).
How sunny is it?
Valentia, 38 km south-west, averages about 1,327 hours of sunshine a year (1991–2020, from its daily record). Met Éireann publishes no sunshine figure for the town itself.
Are these figures for Castlegregory itself?
Partly. The temperatures and rain are Met Éireann’s 1991–2020 averages on its 1 km grid, read at Castlegregory’s population centre; the frosts, degree days and year-to-year swings are those of Valentia, 38 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 Castlegregory’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 Castlegregory →
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).