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Castries vs Tromsø
Comparing Castries change · Tromsø change
Castries is the warmer of the two — about 43°F on the annual average; Castries is the wetter, with 34 in 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 43°F on the annual average.
Precipitation
Castries is the wetter — about 34 in 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 (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 | 83 | 84 | 84 | 83 | 83 | 81 |
| Tromsø | 30 | 30 | 33 | 39 | 48 | 55 | 61 | 59 | 52 | 41 | 36 | 33 |
| Difference | -50 | -50 | -47 | -42 | -35 | -28 | -22 | -25 | -32 | -42 | -47 | -49 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Tromsø | 30 | 30 | 33 | 39 | 48 | 55 |
| Difference | -50 | -50 | -47 | -42 | -35 | -28 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Tromsø | 61 | 59 | 52 | 41 | 36 | 33 |
| Difference | -22 | -25 | -32 | -42 | -47 | -49 |
Avg low (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 79 |
| Tromsø | 22 | 22 | 24 | 29 | 36 | 43 | 48 | 47 | 41 | 34 | 29 | 25 |
| Difference | -56 | -56 | -54 | -50 | -44 | -38 | -33 | -35 | -41 | -48 | -52 | -54 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Tromsø | 22 | 22 | 24 | 29 | 36 | 43 |
| Difference | -56 | -56 | -54 | -50 | -44 | -38 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Tromsø | 48 | 47 | 41 | 34 | 29 | 25 |
| Difference | -33 | -35 | -41 | -48 | -52 | -54 |
Precipitation (in) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Tromsø | 4.3 | 3.7 | 3.9 | 2.7 | 2.2 | 2.3 | 2.9 | 3.5 | 4.4 | 5.1 | 3.7 | 4.3 |
| Difference | -0.2 | +0.7 | +1.2 | -0.8 | -2.3 | -3 | -5.6 | -8 | -4.5 | -4.6 | -5.9 | -1.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Tromsø | 4.3 | 3.7 | 3.9 | 2.7 | 2.2 | 2.3 |
| Difference | -0.2 | +0.7 | +1.2 | -0.8 | -2.3 | -3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Tromsø | 2.9 | 3.5 | 4.4 | 5.1 | 3.7 | 4.3 |
| Difference | -5.6 | -8 | -4.5 | -4.6 | -5.9 | -1.5 |
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