Portadown climate — normals and trends
Portadown (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.5 °C and it receives 822 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 (4.6 °C). Rainfall peaks in August.
Portadown averages 27 frost days, 0 hot days (≥ 30 °C) and 161 rainy days per year.
Portadown has warmed by +0.9 °C between 1940 and 2025, or +0.11 °C per decade. This trend is statistically significant.
The number of frost days there went from about 38 to 16 per year over the period.
The hottest day of the period reached 28.7 °C (on 28 June 2018) and the coldest -13.6 °C (on 21 December 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
PortadownNorthern Ireland
- coords
- 54.42°, -6.44°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.5°C
Average daily high
12.4°C
Average daily low
6.6°C
Annual rainfall
822mm
Sunshine / day
7.0h
Mean relative humidity
82%
Average peak wind
19.9km/h
Seasonal range
10.5°C
Frost days (< 0 °C)
27 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
161 d/yr
Annual snowfall
16.4 cm
Average feels-like high
9.7 °C
Average feels-like low
3.7 °C
Average peak gust
42.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.9 °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
28.7 °C
28 June 2018
Coldest day
-13.6 °C
21 December 2010
Wettest day
45 mm
3 June 2007
Windiest day
59.2 km/h
16 September 1961
Strongest gust
124.2 km/h
26 December 1998
Hottest feels-like
31.4 °C
13 July 1983
Coldest feels-like
-17.7 °C
1 March 1947
Snowiest day
22.0 cm
22 March 2013
Sunniest day
17.0 h
22 June 1949
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 | 6.9 °C | +0.1 °C | 39 mm | -32 mm |
| Feb | 8.4 °C | +1.0 °C | 58 mm | +1 mm |
| Mar | 11.4 °C | +2.2 °C | 21 mm | -39 mm |
| Apr | 14.5 °C | +2.9 °C | 84 mm | +23 mm |
| May | 17.3 °C | +2.8 °C | 47 mm | -23 mm |
| Jun | 18.0 °C | +0.9 °C | 103 mm | +35 mm |
| Jul | 19.6 °C | +1.2 °C | 86 mm | +13 mm |
| Aug | 19.6 °C | +1.5 °C | 47 mm | -31 mm |
| Sep | 15.7 °C | -0.3 °C | 100 mm | +30 mm |
| Oct | 13.0 °C | +0.1 °C | 106 mm | +32 mm |
| Nov | 10.1 °C | +0.8 °C | 100 mm | +33 mm |
| Dec | 8.7 °C | +1.2 °C | 88 mm | +15 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 Portadown?
Portadown has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.5 °C and it receives 822 mm of precipitation per year.
What is the hottest day ever recorded in Portadown?
The hottest day measured in Portadown between 1940 and 2025 was 28 June 2018, reaching 28.7 °C.
What is the coldest day in Portadown?
The coldest day measured in Portadown between 1940 and 2025 was 21 December 2010, at -13.6 °C.
Does it snow in Portadown?
Yes. Portadown gets on average 16.4 cm of snow per year and has around 27 frost days.
Has the climate of Portadown warmed?
Yes: Portadown warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Portadown?
The wettest day measured in Portadown between 1940 and 2025 was 3 June 2007, with 45 mm of rain in 24 hours.
What was the windiest day in Portadown?
The windiest day measured in Portadown between 1940 and 2025 was 16 September 1961, with winds reaching 59.2 km/h.
What is the warmest month in Portadown?
The warmest month in Portadown is July (15.1 °C on average); the coldest is January (4.6 °C).
How much does it rain in Portadown?
Portadown receives on average 822 mm of precipitation per year, spread over about 161 rainy days.
Is it sunny in Portadown?
Portadown gets on average 7.0 hours of sunshine per day, roughly 2,555 hours per year over 1940-2025.
What is the biggest single-day snowfall in Portadown?
The heaviest 24-hour snowfall measured in Portadown between 1940 and 2025 was 22 March 2013, with 22.0 cm.
Are there tropical nights in Portadown?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Portadown.
What was the most extreme apparent temperature in Portadown?
In Portadown, between 1940 and 2025, the highest apparent temperature reached 31.4 °C on 13 July 1983, and the lowest was -17.7 °C on 1 March 1947.
Compare Portadown with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Portadown