Perth climate — normals and trends
Perth (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.8 °C and it receives 932 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 (14.1 °C on average) and the coldest is January (2.1 °C). Rainfall peaks in October.
Perth averages 70 frost days, 0 hot days (≥ 30 °C) and 161 rainy days per year.
Perth has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 95 to 45 per year over the period.
The hottest day of the period reached 28.5 °C (on 19 July 2022) and the coldest -18.4 °C (on 10 January 1982).
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
PerthScotland
- coords
- 56.40°, -3.43°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.8°C
Average daily high
10.8°C
Average daily low
4.6°C
Annual rainfall
932mm
Sunshine / day
6.8h
Mean relative humidity
83%
Average peak wind
17.4km/h
Seasonal range
12.0°C
Frost days (< 0 °C)
70 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
161 d/yr
Annual snowfall
69.2 cm
Average feels-like high
8.0 °C
Average feels-like low
1.7 °C
Average peak gust
39.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
8.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.51 · 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
28.5 °C
19 July 2022
Coldest day
-18.4 °C
10 January 1982
Wettest day
59 mm
7 October 2023
Windiest day
50.0 km/h
15 January 1968
Strongest gust
127.1 km/h
28 January 2002
Hottest feels-like
30.7 °C
28 June 2018
Coldest feels-like
-23.4 °C
10 January 1982
Snowiest day
23.2 cm
18 January 1972
Sunniest day
17.0 h
16 June 2023
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 | 5.1 °C | +0.8 °C | 52 mm | -37 mm |
| Feb | 6.7 °C | +1.6 °C | 78 mm | +8 mm |
| Mar | 10.6 °C | +3.2 °C | 33 mm | -40 mm |
| Apr | 13.5 °C | +3.3 °C | 28 mm | -31 mm |
| May | 17.4 °C | +4.0 °C | 46 mm | -28 mm |
| Jun | 17.4 °C | +1.3 °C | 60 mm | -7 mm |
| Jul | 19.8 °C | +2.2 °C | 92 mm | +14 mm |
| Aug | 19.7 °C | +2.5 °C | 68 mm | -15 mm |
| Sep | 15.3 °C | +0.5 °C | 93 mm | +17 mm |
| Oct | 12.5 °C | +1.2 °C | 115 mm | +23 mm |
| Nov | 8.6 °C | +1.2 °C | 110 mm | +29 mm |
| Dec | 7.3 °C | +2.1 °C | 109 mm | +20 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 Perth?
Perth has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 7.8 °C and it receives 932 mm of precipitation per year.
What is the hottest day ever recorded in Perth?
The hottest day measured in Perth between 1940 and 2025 was 19 July 2022, reaching 28.5 °C.
What is the coldest day in Perth?
The coldest day measured in Perth between 1940 and 2025 was 10 January 1982, at -18.4 °C.
Does it snow in Perth?
Yes. Perth gets on average 69.2 cm of snow per year and has around 70 frost days.
Has the climate of Perth warmed?
Yes: Perth warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Perth?
The wettest day measured in Perth between 1940 and 2025 was 7 October 2023, with 59 mm of rain in 24 hours.
What was the windiest day in Perth?
The windiest day measured in Perth between 1940 and 2025 was 15 January 1968, with winds reaching 50.0 km/h.
What is the warmest month in Perth?
The warmest month in Perth is July (14.1 °C on average); the coldest is January (2.1 °C).
How much does it rain in Perth?
Perth receives on average 932 mm of precipitation per year, spread over about 161 rainy days.
Is it sunny in Perth?
Perth gets on average 6.8 hours of sunshine per day, roughly 2,482 hours per year over 1940-2025.
What is the biggest single-day snowfall in Perth?
The heaviest 24-hour snowfall measured in Perth between 1940 and 2025 was 18 January 1972, with 23.2 cm.
Are there tropical nights in Perth?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Perth.
What was the most extreme apparent temperature in Perth?
In Perth, between 1940 and 2025, the highest apparent temperature reached 30.7 °C on 28 June 2018, and the lowest was -23.4 °C on 10 January 1982.
Compare Perth with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Perth