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Karuizawa vs Castries
Comparing Karuizawa change · Castries change
Castries is the warmer of the two — about 32°F on the annual average; Castries is the wetter, with 37 in more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Karuizawa and Castries, in everyday terms.
Summers
Summers are nearly the same
Karuizawa: Warm
Castries: Warm
Winters
Castries has far milder winters
Karuizawa: Very cold
Castries: Stays warm
Rain & snow
Castries is wetter
Karuizawa: Moderate rainfall
Castries: Very wet
Sky
Castries is sunnier
Karuizawa: Often cloudy
Castries: Fairly sunny
Month-by-month charts
Temperature
Castries is the warmer of the two — about 32°F on the annual average.
Precipitation
Castries is the wetter — about 37 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Karuizawa | 36 | 38 | 46 | 58 | 68 | 73 | 80 | 82 | 74 | 63 | 53 | 42 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +44 | +41 | +34 | +23 | +15 | +10 | +3 | +2 | +10 | +21 | +29 | +39 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Karuizawa | 36 | 38 | 46 | 58 | 68 | 73 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Difference | +44 | +41 | +34 | +23 | +15 | +10 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Karuizawa | 80 | 82 | 74 | 63 | 53 | 42 |
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +3 | +2 | +10 | +21 | +29 | +39 |
Avg low (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Karuizawa | 19 | 19 | 26 | 35 | 46 | 55 | 63 | 64 | 56 | 44 | 33 | 24 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +59 | +58 | +52 | +44 | +35 | +26 | +18 | +18 | +26 | +38 | +48 | +55 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Karuizawa | 19 | 19 | 26 | 35 | 46 | 55 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Difference | +59 | +58 | +52 | +44 | +35 | +26 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Karuizawa | 63 | 64 | 56 | 44 | 33 | 24 |
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +18 | +18 | +26 | +38 | +48 | +55 |
Precipitation (in) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Karuizawa | 1.3 | 1.3 | 2.4 | 2.4 | 3.4 | 4.7 | 6.2 | 4.8 | 5.8 | 4.7 | 1.8 | 1.1 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +3.2 | +1.7 | +0.2 | +1.1 | +1.1 | +0.5 | +2.4 | +6.7 | +3.1 | +5 | +7.7 | +4.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Karuizawa | 1.3 | 1.3 | 2.4 | 2.4 | 3.4 | 4.7 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Difference | +3.2 | +1.7 | +0.2 | +1.1 | +1.1 | +0.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Karuizawa | 6.2 | 4.8 | 5.8 | 4.7 | 1.8 | 1.1 |
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +2.4 | +6.7 | +3.1 | +5 | +7.7 | +4.8 |
Cloud cover (%) Karuizawa runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Karuizawa | 63 | 64 | 65 | 65 | 69 | 81 | 79 | 70 | 75 | 70 | 62 | 61 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -24 | -25 | -23 | -16 | -16 | -22 | -30 | -24 | -24 | -19 | -16 | -20 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Karuizawa | 63 | 64 | 65 | 65 | 69 | 81 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -24 | -25 | -23 | -16 | -16 | -22 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Karuizawa | 79 | 70 | 75 | 70 | 62 | 61 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -30 | -24 | -24 | -19 | -16 | -20 |
Relative humidity (%) Karuizawa runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Karuizawa | 90 | 87 | 82 | 76 | 75 | 79 | 81 | 81 | 83 | 84 | 85 | 88 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -14 | -13 | -7 | — | +3 | — | -2 | -2 | -4 | -5 | -6 | -11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Karuizawa | 90 | 87 | 82 | 76 | 75 | 79 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | -14 | -13 | -7 | — | +3 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Karuizawa | 81 | 81 | 83 | 84 | 85 | 88 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -2 | -2 | -4 | -5 | -6 | -11 |
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. Karuizawa trends → · Castries trends →
Methodology & sources
Karuizawa
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Tomi, about 23 km from the city centre.
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.
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.
← change Karuizawa · change Castries → · Karuizawa page · Castries page