Portlethen climate — normals and trends
Portlethen (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.4 °C and it receives 754 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 (13.6 °C on average) and the coldest is January (4.0 °C). Rainfall peaks in October.
Portlethen averages 16 frost days, 0 hot days (≥ 30 °C) and 150 rainy days per year.
Portlethen has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 28 to 4 per year over the period.
The hottest day of the period reached 23.3 °C (on 21 August 1995) and the coldest -7.9 °C (on 23 January 1945).
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
PortlethenScotland
- coords
- 57.07°, -2.13°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.4°C
Average daily high
10.3°C
Average daily low
6.6°C
Annual rainfall
754mm
Sunshine / day
8.0h
Mean relative humidity
81%
Average peak wind
26.5km/h
Seasonal range
9.6°C
Frost days (< 0 °C)
16 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
150 d/yr
Annual snowfall
33.0 cm
Average feels-like high
6.8 °C
Average feels-like low
2.5 °C
Average peak gust
43.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.43 · 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
23.3 °C
21 August 1995
Coldest day
-7.9 °C
23 January 1945
Wettest day
55 mm
22 October 2002
Windiest day
73.1 km/h
31 January 1953
Strongest gust
138.2 km/h
28 January 2002
Hottest feels-like
23.5 °C
19 July 2022
Coldest feels-like
-13.0 °C
23 January 1945
Snowiest day
15.1 cm
19 January 1960
Sunniest day
17.2 h
23 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 | 5.7 °C | +0.1 °C | 48 mm | -19 mm |
| Feb | 7.0 °C | +1.3 °C | 46 mm | -7 mm |
| Mar | 9.1 °C | +2.1 °C | 27 mm | -29 mm |
| Apr | 10.8 °C | +2.1 °C | 18 mm | -32 mm |
| May | 13.2 °C | +2.3 °C | 33 mm | -21 mm |
| Jun | 15.8 °C | +2.2 °C | 49 mm | -5 mm |
| Jul | 17.5 °C | +2.0 °C | 85 mm | +19 mm |
| Aug | 17.4 °C | +1.8 °C | 40 mm | -27 mm |
| Sep | 15.1 °C | +1.0 °C | 48 mm | -15 mm |
| Oct | 13.0 °C | +1.4 °C | 99 mm | +21 mm |
| Nov | 9.4 °C | +1.0 °C | 101 mm | +25 mm |
| Dec | 8.5 °C | +1.9 °C | 80 mm | +9 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 Portlethen?
Portlethen has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 8.4 °C and it receives 754 mm of precipitation per year.
What is the hottest day ever recorded in Portlethen?
The hottest day measured in Portlethen between 1940 and 2025 was 21 August 1995, reaching 23.3 °C.
What is the coldest day in Portlethen?
The coldest day measured in Portlethen between 1940 and 2025 was 23 January 1945, at -7.9 °C.
Does it snow in Portlethen?
Yes. Portlethen gets on average 33.0 cm of snow per year and has around 16 frost days.
Has the climate of Portlethen warmed?
Yes: Portlethen warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Portlethen?
The wettest day measured in Portlethen between 1940 and 2025 was 22 October 2002, with 55 mm of rain in 24 hours.
What was the windiest day in Portlethen?
The windiest day measured in Portlethen between 1940 and 2025 was 31 January 1953, with winds reaching 73.1 km/h.
What is the warmest month in Portlethen?
The warmest month in Portlethen is August (13.6 °C on average); the coldest is January (4.0 °C).
How much does it rain in Portlethen?
Portlethen receives on average 754 mm of precipitation per year, spread over about 150 rainy days.
Is it sunny in Portlethen?
Portlethen gets on average 8.0 hours of sunshine per day, roughly 2,920 hours per year over 1940-2025.
What is the biggest single-day snowfall in Portlethen?
The heaviest 24-hour snowfall measured in Portlethen between 1940 and 2025 was 19 January 1960, with 15.1 cm.
Are there tropical nights in Portlethen?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Portlethen.
What was the most extreme apparent temperature in Portlethen?
In Portlethen, between 1940 and 2025, the highest apparent temperature reached 23.5 °C on 19 July 2022, and the lowest was -13.0 °C on 23 January 1945.
Compare Portlethen with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Portlethen