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Dundalk, Ireland climate
Cfb Oceanic / temperate
Dundalk has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 20°C, while the coldest is January averaging around 2°C at night. Precipitation is fairly even year-round, totalling about 911 mm. At latitude 54°N, day length swings from 7.1 hours in midwinter to 16.9 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsDundalk climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 9 | 10 | 13 | 16 | 18 | 20 | 19 | 17 | 14 | 10 | 8 |
| Avg temp (°C) | 5 | 5 | 7 | 9 | 12 | 14 | 16 | 15 | 13 | 10 | 7 | 5 |
| Avg low (°C) | 2 | 2 | 3 | 5 | 7 | 10 | 12 | 12 | 10 | 7 | 4 | 2 |
| Precipitation (mm) | 72 | 60 | 78 | 54 | 82 | 74 | 83 | 99 | 65 | 81 | 82 | 81 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 9 | 10 | 13 | 16 | 18 |
| Avg temp (°C) | 5 | 5 | 7 | 9 | 12 | 14 |
| Avg low (°C) | 2 | 2 | 3 | 5 | 7 | 10 |
| Precipitation (mm) | 72 | 60 | 78 | 54 | 82 | 74 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 20 | 19 | 17 | 14 | 10 | 8 |
| Avg temp (°C) | 16 | 15 | 13 | 10 | 7 | 5 |
| Avg low (°C) | 12 | 12 | 10 | 7 | 4 | 2 |
| Precipitation (mm) | 83 | 99 | 65 | 81 | 82 | 81 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 19 | 17 | 18 | 16 | 16 | 16 | 18 | 18 | 16 | 18 | 20 | 19 |
| Days with low ≤ 0°C (days) | 9 | 8 | 6 | 3 | 0.3 | — | — | — | — | 0.8 | 4 | 8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 19 | 17 | 18 | 16 | 16 | 16 |
| Days with low ≤ 0°C (days) | 9 | 8 | 6 | 3 | 0.3 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 18 | 18 | 16 | 18 | 20 | 19 |
| Days with low ≤ 0°C (days) | — | — | — | 0.8 | 4 | 8 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 80 | 78 | 76 | 81 | 81 | 80 | 78 | 77 | 78 | 78 |
| Clear days (≤ 30% cloud) | 1 | 0.7 | 1 | 1 | 2 | 1 | 0.8 | 0.6 | 0.8 | 0.9 | 1 | 1 |
| Partly cloudy days (30–70%) | 7 | 7 | 7 | 7 | 7 | 5 | 5 | 6 | 8 | 9 | 7 | 7 |
| Cloudy days (≥ 70%) | 23 | 20 | 23 | 22 | 22 | 24 | 25 | 24 | 21 | 21 | 22 | 22 |
| Relative humidity (%) | 95 | 93 | 91 | 88 | 85 | 84 | 85 | 87 | 89 | 92 | 95 | 95 |
| Wind speed (km/h) | 14.7 | 14.7 | 13.9 | 12.6 | 12.1 | 11.5 | 11.0 | 11.2 | 12.0 | 12.9 | 13.2 | 13.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 80 | 78 | 76 | 81 |
| Clear days (≤ 30% cloud) | 1 | 0.7 | 1 | 1 | 2 | 1 |
| Partly cloudy days (30–70%) | 7 | 7 | 7 | 7 | 7 | 5 |
| Cloudy days (≥ 70%) | 23 | 20 | 23 | 22 | 22 | 24 |
| Relative humidity (%) | 95 | 93 | 91 | 88 | 85 | 84 |
| Wind speed (km/h) | 14.7 | 14.7 | 13.9 | 12.6 | 12.1 | 11.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 80 | 78 | 77 | 78 | 78 |
| Clear days (≤ 30% cloud) | 0.8 | 0.6 | 0.8 | 0.9 | 1 | 1 |
| Partly cloudy days (30–70%) | 5 | 6 | 8 | 9 | 7 | 7 |
| Cloudy days (≥ 70%) | 25 | 24 | 21 | 21 | 22 | 22 |
| Relative humidity (%) | 85 | 87 | 89 | 92 | 95 | 95 |
| Wind speed (km/h) | 11.0 | 11.2 | 12.0 | 12.9 | 13.2 | 13.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Armagh, a weather station, about 42 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.