Dalkey climate — normals and trends
Dalkey (Ireland) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.0 °C and it receives 874 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (14.8 °C on average) and the coldest is February (6.0 °C). Rainfall peaks in November.
Dalkey averages 2 frost days, 0 hot days (≥ 30 °C) and 159 rainy days per year.
Dalkey has warmed by +0.8 °C between 1940 and 2025, or +0.09 °C per decade. This trend is statistically significant.
The number of frost days there went from about 4 to 0 per year over the period.
The hottest day of the period reached 22.0 °C (on 15 July 1983) and the coldest -3.1 °C (on 14 January 1963).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
DalkeyLeinster
- coords
- 53.28°, -6.10°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.0°C
Average daily high
11.5°C
Average daily low
8.6°C
Annual rainfall
874mm
Sunshine / day
8.1h
Mean relative humidity
82%
Average peak wind
29.3km/h
Seasonal range
8.8°C
Frost days (< 0 °C)
2 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
159 d/yr
Annual snowfall
10.9 cm
Average feels-like high
8.3 °C
Average feels-like low
4.4 °C
Average peak gust
45.4 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.8 °C
since 1940
+0.1 °C per decade · r² = 0.23 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
22.0 °C
15 July 1983
Coldest day
-3.1 °C
14 January 1963
Wettest day
70 mm
25 August 1986
Windiest day
78.0 km/h
19 November 1959
Strongest gust
136.1 km/h
24 December 1997
Hottest feels-like
23.5 °C
19 July 2016
Coldest feels-like
-11.6 °C
1 March 2018
Snowiest day
18.1 cm
8 December 1954
Sunniest day
16.7 h
27 June 2019
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 7.6 °C | 0.0 °C | 83 mm | +0 mm |
| Feb | 8.3 °C | +0.9 °C | 69 mm | +4 mm |
| Mar | 9.7 °C | +1.3 °C | 15 mm | -49 mm |
| Apr | 11.3 °C | +1.6 °C | 110 mm | +54 mm |
| May | 13.5 °C | +1.6 °C | 43 mm | -17 mm |
| Jun | 16.2 °C | +1.8 °C | 91 mm | +31 mm |
| Jul | 17.4 °C | +1.3 °C | 97 mm | +30 mm |
| Aug | 17.5 °C | +1.2 °C | 32 mm | -40 mm |
| Sep | 15.5 °C | +0.4 °C | 125 mm | +49 mm |
| Oct | 13.4 °C | +0.5 °C | 95 mm | +8 mm |
| Nov | 11.2 °C | +1.1 °C | 148 mm | +56 mm |
| Dec | 9.6 °C | +1.0 °C | 102 mm | +12 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Dalkey?
Dalkey has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.0 °C and it receives 874 mm of precipitation per year.
What is the hottest day ever recorded in Dalkey?
The hottest day measured in Dalkey between 1940 and 2025 was 15 July 1983, reaching 22.0 °C.
What is the coldest day in Dalkey?
The coldest day measured in Dalkey between 1940 and 2025 was 14 January 1963, at -3.1 °C.
Does it snow in Dalkey?
Yes. Dalkey gets on average 10.9 cm of snow per year and has around 2 frost days.
Has the climate of Dalkey warmed?
Yes: Dalkey warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Dalkey?
The wettest day measured in Dalkey between 1940 and 2025 was 25 August 1986, with 70 mm of rain in 24 hours.
What was the windiest day in Dalkey?
The windiest day measured in Dalkey between 1940 and 2025 was 19 November 1959, with winds reaching 78.0 km/h.
What is the warmest month in Dalkey?
The warmest month in Dalkey is August (14.8 °C on average); the coldest is February (6.0 °C).
How much does it rain in Dalkey?
Dalkey receives on average 874 mm of precipitation per year, spread over about 159 rainy days.
Is it sunny in Dalkey?
Dalkey gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.
What is the biggest single-day snowfall in Dalkey?
The heaviest 24-hour snowfall measured in Dalkey between 1940 and 2025 was 8 December 1954, with 18.1 cm.
Are there tropical nights in Dalkey?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Dalkey.
What was the most extreme apparent temperature in Dalkey?
In Dalkey, between 1940 and 2025, the highest apparent temperature reached 23.5 °C on 19 July 2016, and the lowest was -11.6 °C on 1 March 2018.
Compare Dalkey with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Dalkey