Midwinter lows in Rathmolyon sink below those of 94% of Irish towns
The warmest part of a July day comes in at 19.9°C on average. Only 18°C separates winter nights from summer afternoons. Its yearly rainfall falls short of 60% of Irish towns. Seedlings are safe outdoors from about 29 April, with the first autumn frost due around 25 October.
Met Éireann 1991–2020 averages for the town’s own square kilometre.
A year in Rathmolyon at a glance
Each month’s typical high and low, in °C.
What stands out about Rathmolyon’s climate
Compared with Irish towns, with its place among towns of 2,500+ in County Meath beside it.
What a year in Rathmolyon feels like
Typical highs and lows by season and by month, from Met Éireann’s 1991–2020 averages.
43 frosts and 2 days of 25°C 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
Counted from Dunsany’s daily readings, 2006–2020, 10 km east of Rathmolyon: Met Éireann publishes these for its stations only.
About 866 mm of rain a year
November is the wettest month and May the driest. 5th wettest of 13 towns of 2,500+ in County Meath. The wettest month brings about 1.5 times the rain of the driest. Dunsany records 1 mm or more on about 149 days a year, and 10 mm on about 23.
Rain by month
Millimetres
Heating a home in Rathmolyon
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 Rathmolyon’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 Dunsany comes by 29 April and the first by 25 October: about 179 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; Rathmolyon’s hazards page covers the risks.
Flood & hazards →Met Éireann’s nearest station: Dunsany
Dunsany is 10 km east of Rathmolyon, the nearest of the 25 synoptic stations where Met Éireann records the weather around the clock. The station stands 83 m above sea level; Rathmolyon’s centre, 79 m.
| Month | High | Low | Rain | Air frosts |
|---|---|---|---|---|
| January | 7.7°C | 1.9°C | 75 mm | 8.0 |
| February | 8.3°C | 1.7°C | 61 mm | 8.3 |
| March | 9.9°C | 1.9°C | 66 mm | 7.9 |
| April | 12.7°C | 3.9°C | 48 mm | 3.5 |
| May | 15.3°C | 6.4°C | 57 mm | 0.6 |
| June | 18.1°C | 9.1°C | 71 mm | 0.0 |
| July | 19.4°C | 11.0°C | 83 mm | 0.0 |
| August | 18.6°C | 10.7°C | 88 mm | 0.0 |
| September | 16.8°C | 8.8°C | 79 mm | 0.2 |
| October | 13.7°C | 6.4°C | 80 mm | 1.4 |
| November | 10.0°C | 3.7°C | 98 mm | 4.5 |
| December | 8.0°C | 2.2°C | 84 mm | 8.3 |
| Year | 13.2°C | 5.6°C | 889 mm | 43 |
The table is Dunsany’s own record, averaged over 2006–2020 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 Rathmolyon itself; the frosts and degree days are this station’s.
How Rathmolyon 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 Meath.
Warmer than it used to be
Rathmolyon’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, 866 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.
Rathmolyon and its neighbours
Every town next door is within half a degree of Rathmolyon 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 |
|---|---|---|---|
| Rathmolyon | 19.9°C | 1.9°C | 866 mm |
| Trim 7.8 km | 20.0°C about the same | 2.0°C about the same | 855 mm |
| Enfield 8.4 km | 19.9°C about the same | 1.9°C about the same | 879 mm |
| Longwood 8.8 km | 20.0°C about the same | 2.0°C about the same | 888 mm |
| Ballivor 12 km | 20.0°C about the same | 2.0°C about the same | 893 mm |
| Kilcock 13 km | 20.0°C about the same | 2.0°C about the same | 851 mm |
| Athboy 17 km | 19.9°C about the same | 1.9°C about the same | 916 mm |
Each town’s colour is Met Éireann’s 1 km grid at its own centre, so towns a few kilometres apart can differ.
Rathmolyon 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 | 1.9°C | 4.9°C | 77 mm |
| February | 8.6°C | 1.8°C | 5.2°C | 63 mm |
| March | 10.5°C | 2.8°C | 6.7°C | 59 mm |
| April | 13.0°C | 4.3°C | 8.7°C | 60 mm |
| May | 15.8°C | 6.7°C | 11.2°C | 58 mm |
| June | 18.4°C | 9.4°C | 13.9°C | 69 mm |
| July | 19.9°C | 11.4°C | 15.6°C | 71 mm |
| August | 19.6°C | 11.1°C | 15.4°C | 77 mm |
| September | 17.4°C | 9.1°C | 13.2°C | 71 mm |
| October | 13.8°C | 6.5°C | 10.2°C | 88 mm |
| November | 10.3°C | 3.8°C | 7.1°C | 90 mm |
| December | 8.2°C | 2.1°C | 5.2°C | 84 mm |
| Year | 13.6°C | 5.9°C | 9.8°C | 866 mm |
How much a month can swing
December swings the most: over 15 years its average ranged from −1.0°C (2010) to 8.0°C (2015). August is the most reliable, staying within 2.1°C.
Where Rathmolyon’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 Rathmolyon’s population centre (0.4 km away).
- Weather station: the nearest of Met Éireann’s 25 synoptic stations, Dunsany, 10 km east, from Met Éireann’s station list.
- Frosts and degree days: Dunsany’s daily readings from Met Éireann (clidata.met.ie), 2006–2020, 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 Rathmolyon’s climate
How warm does Rathmolyon get in summer?
July is the warmest month, with average highs of 19.9°C.
How cold does Rathmolyon get in winter?
The coldest nights come in February, averaging 1.8°C. At Dunsany, the nearest Met Éireann station, the air drops below 0°C on about 43 nights a year (2006–2020).
How much rain does Rathmolyon get?
About 866 mm a year, less than 60% of Irish towns. November is the wettest month (90 mm) and May the driest (58 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 Rathmolyon itself. Its nearest synoptic station is Dunsany.
Are these figures for Rathmolyon itself?
Partly. The temperatures and rain are Met Éireann’s 1991–2020 averages on its 1 km grid, read at Rathmolyon’s population centre; the frosts, degree days and year-to-year swings are those of Dunsany, 10 km east, 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 Rathmolyon’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 Rathmolyon →
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).