St Lawrence climate — normals and trends
St Lawrence has a temperate oceanic climate, averaging 11.9 °C annually with 893 mm of rain per year.
Climate normals · ERA5
St Lawrence
- coords
- 49.22°, -2.14°
- period
- 1940–2025 · 86 yrs
The normals for this period
The average of every indicator across the whole window: temperature, water, sky, wind and notable days.
Mean daily temperature
11.9°C
Average daily high
12.8°C
Average daily low
11.0°C
Annual rainfall
893mm
Sunshine / day
8.9h
Mean relative humidity
81%
Average peak wind
34.0km/h
Seasonal range
9.5°C
Frost days (< 0 °C)
1 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
148 d/yr
Annual snowfall
4.4 cm
Average feels-like high
9.8 °C
Average feels-like low
6.4 °C
Average peak gust
45.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.7 MJ/m²
Has the climate changed?
What the yearly averages say about warming here, and whether the slope is statistically solid.
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.36 · 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).
Climate month by month
How an average year unfolds: when it rains, when it turns hot, when the sun is out.
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
The most extreme days ever measured here, then the year-by-year detail.
Hottest day
25.5 °C
18 July 2022
Coldest day
-5.3 °C
13 January 1987
Wettest day
51 mm
8 October 1997
Windiest day
99.8 km/h
16 October 1987
Strongest gust
144.4 km/h
16 October 1987
Hottest feels-like
27.9 °C
9 August 2003
Coldest feels-like
-14.8 °C
13 January 1987
Snowiest day
13.0 cm
11 March 2013
Sunniest day
15.8 h
19 June 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and compare it with the normal: warmer, drier, more extreme?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 9.0 °C | +0.1 °C | 175 mm | +75 mm |
| Feb | 9.0 °C | +0.6 °C | 58 mm | -21 mm |
| Mar | 10.2 °C | +1.0 °C | 34 mm | -30 mm |
| Apr | 12.5 °C | +2.1 °C | 49 mm | -0 mm |
| May | 14.2 °C | +1.5 °C | 23 mm | -26 mm |
| Jun | 17.1 °C | +2.1 °C | 39 mm | -2 mm |
| Jul | 18.4 °C | +1.5 °C | 48 mm | +7 mm |
| Aug | 19.3 °C | +1.6 °C | 30 mm | -21 mm |
| Sep | 17.5 °C | +0.4 °C | 104 mm | +34 mm |
| Oct | 15.8 °C | +0.7 °C | 115 mm | +13 mm |
| Nov | 13.5 °C | +1.3 °C | 99 mm | -28 mm |
| Dec | 10.9 °C | +0.7 °C | 116 mm | -5 mm |
The year's extremes
What was the weather like that day?
The weather actually measured on a given date, anywhere in the covered window.
Climate at a glance
What these normals say about the place, in a few sentences, and the notions needed to read them.
St Lawrence (Jersey) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 11.9 °C and it receives 893 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 (16.9 °C on average) and the coldest is February (7.4 °C). Rainfall peaks in November.
St Lawrence averages 1 frost days, 0 hot days (≥ 30 °C) and 148 rainy days per year.
St Lawrence has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The number of frost days there went from about 2 to 0 per year over the period.
The hottest day of the period reached 25.5 °C (on 18 July 2022) and the coldest -5.3 °C (on 13 January 1987).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Compare St Lawrence with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around St Lawrence
Other cities — Jersey
Frequently asked questions
What is the climate of St Lawrence?
St Lawrence has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 11.9 °C and it receives 893 mm of precipitation per year.
What is the hottest day ever recorded in St Lawrence?
The hottest day measured in St Lawrence between 1940 and 2025 was 18 July 2022, reaching 25.5 °C.
What is the coldest day in St Lawrence?
The coldest day measured in St Lawrence between 1940 and 2025 was 13 January 1987, at -5.3 °C.
Does it snow in St Lawrence?
Yes. St Lawrence gets on average 4.4 cm of snow per year and has around 1 frost days.
Has the climate of St Lawrence warmed?
Yes: St Lawrence warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in St Lawrence?
The wettest day measured in St Lawrence between 1940 and 2025 was 8 October 1997, with 51 mm of rain in 24 hours.
What was the windiest day in St Lawrence?
The windiest day measured in St Lawrence between 1940 and 2025 was 16 October 1987, with winds reaching 99.8 km/h.
What is the warmest month in St Lawrence?
The warmest month in St Lawrence is August (16.9 °C on average); the coldest is February (7.4 °C).
How much does it rain in St Lawrence?
St Lawrence receives on average 893 mm of precipitation per year, spread over about 148 rainy days.
Is it sunny in St Lawrence?
St Lawrence gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in St Lawrence?
The heaviest 24-hour snowfall measured in St Lawrence between 1940 and 2025 was 11 March 2013, with 13.0 cm.
Are there tropical nights in St Lawrence?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in St Lawrence.
What was the most extreme apparent temperature in St Lawrence?
In St Lawrence, between 1940 and 2025, the highest apparent temperature reached 27.9 °C on 9 August 2003, and the lowest was -14.8 °C on 13 January 1987.
These forecasts and records come from our own weather API. Developer documentation →