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Karuizawa vs Castries
Comparing Karuizawa change · Castries change
Castries is the warmer of the two — about 18°C on the annual average; Castries is the wetter, with 949 mm 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 18°C on the annual average.
Precipitation
Castries is the wetter — about 949 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Karuizawa | 2 | 4 | 8 | 15 | 20 | 23 | 27 | 28 | 23 | 17 | 12 | 6 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +24 | +23 | +19 | +13 | +8 | +5 | +2 | +1 | +6 | +12 | +16 | +22 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Karuizawa | 2 | 4 | 8 | 15 | 20 | 23 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Difference | +24 | +23 | +19 | +13 | +8 | +5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Karuizawa | 27 | 28 | 23 | 17 | 12 | 6 |
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +2 | +1 | +6 | +12 | +16 | +22 |
Avg low (°C) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Karuizawa | -7 | -7 | -4 | 2 | 8 | 13 | 17 | 18 | 13 | 7 | 1 | -4 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +33 | +32 | +29 | +24 | +19 | +15 | +10 | +10 | +14 | +21 | +26 | +31 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Karuizawa | -7 | -7 | -4 | 2 | 8 | 13 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Difference | +33 | +32 | +29 | +24 | +19 | +15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Karuizawa | 17 | 18 | 13 | 7 | 1 | -4 |
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +10 | +10 | +14 | +21 | +26 | +31 |
Precipitation (mm) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Karuizawa | 32 | 33 | 61 | 62 | 87 | 120 | 156 | 122 | 146 | 118 | 47 | 28 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | +81 | +42 | +6 | +27 | +27 | +13 | +60 | +169 | +78 | +128 | +196 | +121 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Karuizawa | 32 | 33 | 61 | 62 | 87 | 120 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Difference | +81 | +42 | +6 | +27 | +27 | +13 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Karuizawa | 156 | 122 | 146 | 118 | 47 | 28 |
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | +60 | +169 | +78 | +128 | +196 | +121 |
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