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Saint Croix, US Virgin Islands climate
Aw Tropical savanna (dry winter)
Saint Croix has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is August with an average daily high near 32°C, while the coldest is January averaging around 22°C at night. Precipitation totals about 894 mm a year and is strongly seasonal — November alone averages 135 mm while February barely receives 33 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Saint Croix climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 29 | 30 | 31 | 31 | 32 | 32 | 32 | 31 | 30 | 29 |
| Avg temp (°C) | 26 | 26 | 26 | 27 | 27 | 28 | 29 | 29 | 28 | 28 | 27 | 26 |
| Avg low (°C) | 22 | 22 | 22 | 23 | 24 | 25 | 26 | 26 | 25 | 25 | 24 | 23 |
| Precipitation (mm) | 47 | 33 | 42 | 50 | 86 | 50 | 74 | 81 | 104 | 113 | 135 | 79 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 29 | 30 | 31 | 31 |
| Avg temp (°C) | 26 | 26 | 26 | 27 | 27 | 28 |
| Avg low (°C) | 22 | 22 | 22 | 23 | 24 | 25 |
| Precipitation (mm) | 47 | 33 | 42 | 50 | 86 | 50 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 32 | 32 | 31 | 30 | 29 |
| Avg temp (°C) | 29 | 29 | 28 | 28 | 27 | 26 |
| Avg low (°C) | 26 | 26 | 25 | 25 | 24 | 23 |
| Precipitation (mm) | 74 | 81 | 104 | 113 | 135 | 79 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 13 | 12 | 10 | 12 | 11 | 16 | 15 | 15 | 16 | 16 | 17 |
| Days with high ≥ 32°C (days) | — | 0.0 | 0.1 | 0.2 | 3 | 9 | 14 | 16 | 12 | 10 | 3 | 0.1 |
| Days with low ≤ 0°C (days) | — | — | — | — | 0.0 | 0.0 | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 13 | 12 | 10 | 12 | 11 |
| Days with high ≥ 32°C (days) | — | 0.0 | 0.1 | 0.2 | 3 | 9 |
| Days with low ≤ 0°C (days) | — | — | — | — | 0.0 | 0.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 15 | 15 | 16 | 16 | 17 |
| Days with high ≥ 32°C (days) | 14 | 16 | 12 | 10 | 3 | 0.1 |
| Days with low ≤ 0°C (days) | — | — | — | — | — | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 34 | 32 | 36 | 37 | 52 | 50 | 45 | 41 | 49 | 47 | 45 | 37 |
| Relative humidity (%) | 76 | 75 | 75 | 77 | 79 | 79 | 79 | 79 | 79 | 78 | 78 | 76 |
| Wind speed (km/h) | 21.8 | 21.3 | 19.8 | 19.0 | 19.0 | 21.1 | 22.2 | 20.4 | 17.5 | 17.1 | 19.1 | 21.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 34 | 32 | 36 | 37 | 52 | 50 |
| Relative humidity (%) | 76 | 75 | 75 | 77 | 79 | 79 |
| Wind speed (km/h) | 21.8 | 21.3 | 19.8 | 19.0 | 19.0 | 21.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 45 | 41 | 49 | 47 | 45 | 37 |
| Relative humidity (%) | 79 | 79 | 79 | 78 | 78 | 76 |
| Wind speed (km/h) | 22.2 | 20.4 | 17.5 | 17.1 | 19.1 | 21.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 28 years of daily observations at Henry E Rohlsen AP, a weather station, about 8 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.