St Croix climate — normals and trends
St Croix (U.S. Virgin Islands) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.2 °C and it receives 908 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 (27.3 °C on average) and the coldest is February (24.8 °C). Rainfall peaks in October.
St Croix averages 0 frost days, 0 hot days (≥ 30 °C) and 171 rainy days per year.
St Croix has warmed by +0.7 °C between 1940 and 2025, or +0.09 °C per decade. This trend is statistically significant.
The hottest day of the period reached 30.0 °C (on 13 October 2024) and the coldest 21.5 °C (on 30 January 1950).
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
St CroixSaint Croix Island
- coords
- 17.73°, -64.75°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.2°C
Average daily high
26.8°C
Average daily low
25.4°C
Annual rainfall
908mm
Sunshine / day
11.3h
Mean relative humidity
79%
Average peak wind
29.5km/h
Seasonal range
2.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
171 d/yr
Annual snowfall
0.0 cm
Average feels-like high
29.4 °C
Average feels-like low
26.7 °C
Average peak gust
40.7 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
20.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.7 °C
since 1940
+0.1 °C per decade · r² = 0.40 · 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
30.0 °C
13 October 2024
Coldest day
21.5 °C
30 January 1950
Wettest day
191 mm
17 November 1999
Windiest day
102.9 km/h
20 September 2017
Strongest gust
159.8 km/h
18 September 1989
Hottest feels-like
37.5 °C
21 September 2024
Coldest feels-like
17.8 °C
14 February 1949
Sunniest day
12.9 h
12 July 2025
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 | 26.6 °C | +1.0 °C | 28 mm | -3 mm |
| Feb | 26.2 °C | +0.9 °C | 27 mm | +2 mm |
| Mar | 26.3 °C | +0.9 °C | 30 mm | +6 mm |
| Apr | 26.5 °C | +0.6 °C | 105 mm | +62 mm |
| May | 27.5 °C | +0.7 °C | 87 mm | +1 mm |
| Jun | 27.8 °C | +0.3 °C | 22 mm | -44 mm |
| Jul | 28.1 °C | +0.4 °C | 50 mm | -34 mm |
| Aug | 28.8 °C | +0.8 °C | 116 mm | +3 mm |
| Sep | 28.8 °C | +0.8 °C | 151 mm | +16 mm |
| Oct | 28.5 °C | +0.7 °C | 145 mm | +8 mm |
| Nov | 27.8 °C | +0.7 °C | 80 mm | -34 mm |
| Dec | 26.9 °C | +0.7 °C | 28 mm | -22 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 St Croix?
St Croix has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.2 °C and it receives 908 mm of precipitation per year.
What is the hottest day ever recorded in St Croix?
The hottest day measured in St Croix between 1940 and 2025 was 13 October 2024, reaching 30.0 °C.
What is the coldest day in St Croix?
The coldest day measured in St Croix between 1940 and 2025 was 30 January 1950, at 21.5 °C.
Does it snow in St Croix?
Almost never: St Croix sees virtually no snow, with about 0 frost days per year.
Has the climate of St Croix warmed?
Yes: St Croix warmed by +0.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in St Croix?
The wettest day measured in St Croix between 1940 and 2025 was 17 November 1999, with 191 mm of rain in 24 hours.
What was the windiest day in St Croix?
The windiest day measured in St Croix between 1940 and 2025 was 20 September 2017, with winds reaching 102.9 km/h.
What is the warmest month in St Croix?
The warmest month in St Croix is August (27.3 °C on average); the coldest is February (24.8 °C).
How much does it rain in St Croix?
St Croix receives on average 908 mm of precipitation per year, spread over about 171 rainy days.
Is it sunny in St Croix?
St Croix gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
Are there tropical nights in St Croix?
Yes: St Croix has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in St Croix?
In St Croix, between 1940 and 2025, the highest apparent temperature reached 37.5 °C on 21 September 2024, and the lowest was 17.8 °C on 14 February 1949.
Compare St Croix with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around St Croix