Letterkenny in Winter
In winter (December, January and February), Letterkenny sees average daytime highs around 8°C and overnight lows near 3°C, with 312 mm of precipitation over about 53 wet days across the season. It is the coldest season of the year and the wettest season of the year.
Across winter, daytime highs hold fairly steady around 8°C. The sky is clear or mostly clear about 7% of the time across winter, and the air most often feels dry.
Winter is Letterkenny's weakest season of the year to visit on our travel score. For the whole year in context, see Letterkenny's year-round climate.
- Avg daytime high
- 8°C
- coldest season of the year
- Avg overnight low
- 3°C
- Precipitation
- 312 mm
- 53 wet days
- Avg wind
- 19 km/h
- Travel score
- 0.9
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Letterkenny in Winter
Across winter, daytime highs hold fairly steady around 8°C.
A typical winter day in Letterkenny reaches about 8°C and drops to 3°C overnight. The warmest of the three months is December, the coolest January.
How winter really feels in Letterkenny
Once humidity and wind are folded in, winter brings about 0 days that feel above 32°C and 83 that feel at or below 0°C.
The story in winter is cold — wind chill drags the overnight "feels like" below the raw low.
Letterkenny weather by month
How the three winter months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 7° / 3° | 108 | 18.5 | 2 | 7.6 | 0.8 |
| Feb | 8° / 3° | 91 | 15.9 | 1.8 | 9.3 | 1.0 |
| Mar | 9° / 4° | 88 | 17 | 1.3 | 11.4 | 1.5 |
| Apr | 11° / 5° | 80 | 16.1 | 0.3 | 13.8 | 2.3 |
| May | 14° / 7° | 86 | 15.9 | 0 | 15.8 | 3.3 |
| Jun | 16° / 10° | 92 | 16 | 0 | 17 | 3.9 |
| Jul | 17° / 12° | 101 | 18 | 0 | 16.5 | 4.3 |
| Aug | 17° / 12° | 105 | 17.8 | 0 | 14.7 | 4.3 |
| Sep | 15° / 10° | 88 | 15.5 | 0 | 12.5 | 3.9 |
| Oct | 13° / 8° | 105 | 17.1 | 0 | 10.2 | 2.8 |
| Nov | 10° / 6° | 110 | 18.8 | 0.3 | 8.1 | 1.6 |
| Dec | 8° / 4° | 113 | 18.1 | 1.2 | 7 | 0.9 |
Cloud cover in Winter
The sky is clear or mostly clear about 7% of the time across winter.
Chance of precipitation in Winter
Letterkenny gets around 312 mm of rain and snow over 53 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 19 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 7 h 18 min in early December to 10 h 12 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 0.7 kWh/m².
Is winter a good time to visit Letterkenny?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a weaker month for outdoor sightseeing in Letterkenny.
What to pack for Letterkenny in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Letterkenny sees daytime highs around 8°C and nights near 3°C. Pack a warm layer and rain gear. Worth having: a heavy coat. About 53 days see rain.
Sea temperature near Letterkenny in Winter
The nearest coast averages about 9°C across winter — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 45 km away) is warmest in August at about 15°C and coldest in February near 9°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 9 | 9 | 9 | 9 | 11 | 13 | 15 | 15 | 15 | 13 | 12 | 10 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 9 | Bracing |
| Feb | 9 | Bracing |
| Mar | 9 | Bracing |
| Apr | 9 | Bracing |
| May | 11 | Bracing |
| Jun | 13 | Bracing |
| Jul | 15 | Bracing |
| Aug | 15 | Cool |
| Sep | 15 | Bracing |
| Oct | 13 | Bracing |
| Nov | 12 | Bracing |
| Dec | 10 | Bracing |
UV index in Letterkenny in Winter
Clear-sky midday UV across winter averages around 1. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Letterkenny peaks around May 24 at about 5 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 0 | 1 | 2 | 3 | 5 | 5 | 5 | 5 | 3 | 2 | 1 | 0 |
| Level | Low | Low | Moderate | Moderate | High | High | High | Moderate | Moderate | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 0 | Low |
| Feb | 1 | Low |
| Mar | 2 | Moderate |
| Apr | 3 | Moderate |
| May | 5 | High |
| Jun | 5 | High |
| Jul | 5 | High |
| Aug | 5 | Moderate |
| Sep | 3 | Moderate |
| Oct | 2 | Low |
| Nov | 1 | Low |
| Dec | 0 | Low |
Where is Letterkenny?
Letterkenny sits at 55.0°N, 7.7°W, 8 m above sea level, in Ireland. The nearest listed city is Londonderry County Borough, 28 km away.
Topography around Letterkenny
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Letterkenny.
Within 3 km, the terrain around Letterkenny has only modest variations in elevation — a maximum elevation change of 199 m around an average of 73 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 452 m; within 80 km, large variations in elevation — a maximum elevation change of 706 m.
The land around Letterkenny is covered by grassland (60%) and trees (25%) within 3 km, grassland (72%) and trees (20%) within 16 km, and grassland (53%) and water (38%) within 80 km.
Ireland travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type G
- 230 V · 50 Hz
- Prices
- ≈ 85% of US
- price level, 2025
- GDP per capita
- $131,592
- 2025
- Happiness
- 6.9 / 10
- World Happiness, 2025
- Safe drinking water
- 96%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2023
- Road deaths
- 3.1
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Letterkenny (54.95°, -7.7333°, elevation 8 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.