Johnstone climate — normals and trends
Johnstone (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.8 °C and it receives 1,162 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 (14.5 °C on average) and the coldest is January (3.8 °C). Rainfall peaks in October.
Johnstone averages 41 frost days, 0 hot days (≥ 30 °C) and 184 rainy days per year.
Johnstone has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 58 to 24 per year over the period.
The hottest day of the period reached 29.7 °C (on 4 August 1975) and the coldest -18.8 °C (on 26 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
JohnstoneScotland
- coords
- 55.83°, -4.52°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.8°C
Average daily high
11.6°C
Average daily low
6.1°C
Annual rainfall
1,162mm
Sunshine / day
6.8h
Mean relative humidity
83%
Average peak wind
21.0km/h
Seasonal range
10.7°C
Frost days (< 0 °C)
41 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
184 d/yr
Annual snowfall
30.5 cm
Average feels-like high
8.7 °C
Average feels-like low
2.9 °C
Average peak gust
44.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
29.7 °C
4 August 1975
Coldest day
-18.8 °C
26 January 1945
Wettest day
70 mm
10 August 2004
Windiest day
68.7 km/h
15 January 1968
Strongest gust
149.4 km/h
28 January 2002
Hottest feels-like
32.5 °C
29 July 1948
Coldest feels-like
-23.6 °C
26 January 1945
Snowiest day
14.8 cm
25 January 1990
Sunniest day
17.0 h
19 June 1940
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 | 6.3 °C | +0.4 °C | 61 mm | -49 mm |
| Feb | 7.6 °C | +1.2 °C | 88 mm | -1 mm |
| Mar | 11.2 °C | +2.9 °C | 50 mm | -39 mm |
| Apr | 14.3 °C | +3.6 °C | 44 mm | -30 mm |
| May | 17.1 °C | +3.2 °C | 77 mm | -3 mm |
| Jun | 16.8 °C | +0.6 °C | 114 mm | +35 mm |
| Jul | 19.0 °C | +1.6 °C | 92 mm | +5 mm |
| Aug | 19.1 °C | +1.8 °C | 91 mm | -10 mm |
| Sep | 15.6 °C | +0.4 °C | 126 mm | +21 mm |
| Oct | 12.5 °C | +0.3 °C | 142 mm | +23 mm |
| Nov | 9.6 °C | +1.0 °C | 171 mm | +60 mm |
| Dec | 8.3 °C | +1.6 °C | 171 mm | +52 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 Johnstone?
Johnstone has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 8.8 °C and it receives 1,162 mm of precipitation per year.
What is the hottest day ever recorded in Johnstone?
The hottest day measured in Johnstone between 1940 and 2025 was 4 August 1975, reaching 29.7 °C.
What is the coldest day in Johnstone?
The coldest day measured in Johnstone between 1940 and 2025 was 26 January 1945, at -18.8 °C.
Does it snow in Johnstone?
Yes. Johnstone gets on average 30.5 cm of snow per year and has around 41 frost days.
Has the climate of Johnstone warmed?
Yes: Johnstone warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Johnstone?
The wettest day measured in Johnstone between 1940 and 2025 was 10 August 2004, with 70 mm of rain in 24 hours.
What was the windiest day in Johnstone?
The windiest day measured in Johnstone between 1940 and 2025 was 15 January 1968, with winds reaching 68.7 km/h.
What is the warmest month in Johnstone?
The warmest month in Johnstone is July (14.5 °C on average); the coldest is January (3.8 °C).
How much does it rain in Johnstone?
Johnstone receives on average 1,162 mm of precipitation per year, spread over about 184 rainy days.
Is it sunny in Johnstone?
Johnstone 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 Johnstone?
The heaviest 24-hour snowfall measured in Johnstone between 1940 and 2025 was 25 January 1990, with 14.8 cm.
Are there tropical nights in Johnstone?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Johnstone.
What was the most extreme apparent temperature in Johnstone?
In Johnstone, between 1940 and 2025, the highest apparent temperature reached 32.5 °C on 29 July 1948, and the lowest was -23.6 °C on 26 January 1945.
Compare Johnstone with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Johnstone