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Castries vs Tromsø
Comparing Castries change · Tromsø change
Castries is the warmer of the two — about 24°C on the annual average; Castries is the wetter, with 873 mm more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Castries and Tromsø, in everyday terms.
Summers
Castries has far hotter summers
Castries: Warm
Tromsø: Cool
Winters
Castries has far milder winters
Castries: Stays warm
Tromsø: Cold
Rain & snow
Castries is wetter
Castries: Very wet
Tromsø: Wet
Sky
Castries is far sunnier
Castries: Fairly sunny
Tromsø: Often grey
Month-by-month charts
Temperature
Castries is the warmer of the two — about 24°C on the annual average.
Precipitation
Castries is the wetter — about 873 mm more across the year.
Clear skies
Castries has the clearer skies — the higher line.
Exact monthly numbers
Tap a metric to open its full table. Desktop shows all twelve months; on a phone each metric splits into Jan–Jun and Jul–Dec.
Avg high (°C) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Tromsø | -1 | -1 | 1 | 4 | 9 | 13 | 16 | 15 | 11 | 5 | 2 | 0 |
| Difference | -28 | -28 | -26 | -23 | -19 | -15 | -12 | -14 | -18 | -23 | -26 | -27 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Tromsø | -1 | -1 | 1 | 4 | 9 | 13 |
| Difference | -28 | -28 | -26 | -23 | -19 | -15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Tromsø | 16 | 15 | 11 | 5 | 2 | 0 |
| Difference | -12 | -14 | -18 | -23 | -26 | -27 |
Avg low (°C) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 26 |
| Tromsø | -5 | -6 | -4 | -2 | 2 | 6 | 9 | 8 | 5 | 1 | -2 | -4 |
| Difference | -31 | -31 | -30 | -28 | -24 | -21 | -18 | -19 | -23 | -27 | -29 | -30 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Tromsø | -5 | -6 | -4 | -2 | 2 | 6 |
| Difference | -31 | -31 | -30 | -28 | -24 | -21 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Tromsø | 9 | 8 | 5 | 1 | -2 | -4 |
| Difference | -18 | -19 | -23 | -27 | -29 | -30 |
Precipitation (mm) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 | 216 | 291 | 224 | 246 | 243 | 149 |
| Tromsø | 109 | 94 | 98 | 70 | 56 | 57 | 74 | 89 | 111 | 129 | 93 | 110 |
| Difference | -5 | +18 | +32 | -20 | -58 | -76 | -142 | -202 | -114 | -118 | -150 | -39 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Tromsø | 109 | 94 | 98 | 70 | 56 | 57 |
| Difference | -5 | +18 | +32 | -20 | -58 | -76 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Tromsø | 74 | 89 | 111 | 129 | 93 | 110 |
| Difference | -142 | -202 | -114 | -118 | -150 | -39 |
Cloud cover (%) Tromsø runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Tromsø | 83 | 81 | 80 | 77 | 76 | 79 | 79 | 79 | 79 | 80 | 81 | 85 |
| Difference | +44 | +42 | +39 | +27 | +24 | +20 | +29 | +32 | +28 | +28 | +35 | +44 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Tromsø | 83 | 81 | 80 | 77 | 76 | 79 |
| Difference | +44 | +42 | +39 | +27 | +24 | +20 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Tromsø | 79 | 79 | 79 | 80 | 81 | 85 |
| Difference | +29 | +32 | +28 | +28 | +35 | +44 |
Relative humidity (%) Tromsø runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Tromsø | 95 | 95 | 94 | 92 | 86 | 80 | 82 | 85 | 90 | 95 | 96 | 96 |
| Difference | +20 | +20 | +19 | +16 | +8 | +2 | +3 | +6 | +11 | +16 | +17 | +19 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Tromsø | 95 | 95 | 94 | 92 | 86 | 80 |
| Difference | +20 | +20 | +19 | +16 | +8 | +2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Tromsø | 82 | 85 | 90 | 95 | 96 | 96 |
| Difference | +3 | +6 | +11 | +16 | +17 | +19 |
How both climates are changing
Both cities are warming. Each city has its own warming trend; see its trends page for the year-by-year detail. Castries trends → · Tromsø trends →
Tromsø from Dfc to Dfb.
Methodology & sources
Castries
Temperature — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.
Precipitation — 1991–2020 normals computed from 10 years of daily observations at LE Lamentin, a weather station, about 66 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.
Tromsø
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Tromso, a weather station, about 1 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.
← change Castries · change Tromsø → · Castries page · Tromsø page