Shannon climate — normals and trends
Shannon (Ireland) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.9 °C and it receives 1,005 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 July (15.1 °C on average) and the coldest is January (5.2 °C). Rainfall peaks in December.
Shannon averages 23 frost days, 0 hot days (≥ 30 °C) and 173 rainy days per year.
Shannon has warmed by +0.4 °C between 1940 and 2025, or +0.05 °C per decade. This trend is statistically significant.
The number of frost days there went from about 29 to 17 per year over the period.
The hottest day of the period reached 30.5 °C (on 13 July 1983) and the coldest -9.1 °C (on 9 January 2010).
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
ShannonMunster
- coords
- 52.70°, -8.86°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.9°C
Average daily high
12.8°C
Average daily low
7.0°C
Annual rainfall
1,005mm
Sunshine / day
6.9h
Mean relative humidity
83%
Average peak wind
19.9km/h
Seasonal range
9.9°C
Frost days (< 0 °C)
23 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
173 d/yr
Annual snowfall
7.5 cm
Average feels-like high
10.2 °C
Average feels-like low
4.2 °C
Average peak gust
43.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.4 °C
since 1940
+0.1 °C per decade · r² = 0.06 · p = 0.026
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
30.5 °C
13 July 1983
Coldest day
-9.1 °C
9 January 2010
Wettest day
55 mm
25 August 1986
Windiest day
65.0 km/h
24 December 1997
Strongest gust
140.0 km/h
12 January 1974
Hottest feels-like
33.9 °C
13 July 1983
Coldest feels-like
-14.0 °C
20 January 1940
Snowiest day
13.2 cm
8 December 1954
Sunniest day
16.5 h
19 June 2025
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 | 7.5 °C | -0.1 °C | 100 mm | +7 mm |
| Feb | 9.3 °C | +1.2 °C | 112 mm | +35 mm |
| Mar | 11.7 °C | +1.8 °C | 37 mm | -41 mm |
| Apr | 15.3 °C | +3.3 °C | 71 mm | +2 mm |
| May | 18.1 °C | +3.4 °C | 68 mm | -12 mm |
| Jun | 18.0 °C | +1.0 °C | 82 mm | +10 mm |
| Jul | 19.3 °C | +1.0 °C | 99 mm | +23 mm |
| Aug | 19.6 °C | +1.5 °C | 65 mm | -23 mm |
| Sep | 15.7 °C | -0.5 °C | 143 mm | +58 mm |
| Oct | 13.4 °C | +0.1 °C | 121 mm | +27 mm |
| Nov | 10.9 °C | +1.0 °C | 139 mm | +48 mm |
| Dec | 8.9 °C | +0.6 °C | 99 mm | -3 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 Shannon?
Shannon has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.9 °C and it receives 1,005 mm of precipitation per year.
What is the hottest day ever recorded in Shannon?
The hottest day measured in Shannon between 1940 and 2025 was 13 July 1983, reaching 30.5 °C.
What is the coldest day in Shannon?
The coldest day measured in Shannon between 1940 and 2025 was 9 January 2010, at -9.1 °C.
Does it snow in Shannon?
Yes. Shannon gets on average 7.5 cm of snow per year and has around 23 frost days.
Has the climate of Shannon warmed?
Yes: Shannon warmed by +0.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Shannon?
The wettest day measured in Shannon between 1940 and 2025 was 25 August 1986, with 55 mm of rain in 24 hours.
What was the windiest day in Shannon?
The windiest day measured in Shannon between 1940 and 2025 was 24 December 1997, with winds reaching 65.0 km/h.
What is the warmest month in Shannon?
The warmest month in Shannon is July (15.1 °C on average); the coldest is January (5.2 °C).
How much does it rain in Shannon?
Shannon receives on average 1,005 mm of precipitation per year, spread over about 173 rainy days.
Is it sunny in Shannon?
Shannon gets on average 6.9 hours of sunshine per day, roughly 2,519 hours per year over 1940-2025.
What is the biggest single-day snowfall in Shannon?
The heaviest 24-hour snowfall measured in Shannon between 1940 and 2025 was 8 December 1954, with 13.2 cm.
Are there tropical nights in Shannon?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Shannon.
What was the most extreme apparent temperature in Shannon?
In Shannon, between 1940 and 2025, the highest apparent temperature reached 33.9 °C on 13 July 1983, and the lowest was -14.0 °C on 20 January 1940.
Compare Shannon with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Shannon