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Castries vs Portland
Comparing Castries change · Portland change
Castries is the warmer of the two — about 14°C on the annual average; Castries is the wetter, with 1024 mm more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Castries and Portland, in everyday terms.
Summers
Summers are nearly the same
Castries: Warm
Portland: Warm
Winters
Castries has far milder winters
Castries: Stays warm
Portland: Chilly
Rain & snow
Castries is wetter
Castries: Very wet
Portland: Moderate rainfall
Sky
Castries is sunnier
Castries: Fairly sunny
Portland: Often cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 14°C on the annual average.
Precipitation
Castries is the wetter — about 1024 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 |
| Portland | 9 | 11 | 14 | 17 | 21 | 24 | 28 | 28 | 25 | 18 | 12 | 8 |
| Difference | -18 | -16 | -13 | -11 | -7 | -5 | -1 | -1 | -4 | -11 | -16 | -19 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Portland | 9 | 11 | 14 | 17 | 21 | 24 |
| Difference | -18 | -16 | -13 | -11 | -7 | -5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Portland | 28 | 28 | 25 | 18 | 12 | 8 |
| Difference | -1 | -1 | -4 | -11 | -16 | -19 |
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 |
| Portland | 2 | 3 | 4 | 7 | 10 | 12 | 15 | 15 | 12 | 8 | 5 | 2 |
| Difference | -23 | -23 | -21 | -20 | -17 | -15 | -13 | -13 | -16 | -19 | -22 | -24 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Portland | 2 | 3 | 4 | 7 | 10 | 12 |
| Difference | -23 | -23 | -21 | -20 | -17 | -15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Portland | 15 | 15 | 12 | 8 | 5 | 2 |
| Difference | -13 | -13 | -16 | -19 | -22 | -24 |
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 |
| Portland | 128 | 93 | 101 | 73 | 64 | 41 | 13 | 14 | 39 | 87 | 138 | 147 |
| Difference | +14 | +18 | +35 | -16 | -50 | -92 | -203 | -278 | -185 | -160 | -104 | -3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Portland | 128 | 93 | 101 | 73 | 64 | 41 |
| Difference | +14 | +18 | +35 | -16 | -50 | -92 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Portland | 13 | 14 | 39 | 87 | 138 | 147 |
| Difference | -203 | -278 | -185 | -160 | -104 | -3 |
Snowfall (cm)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| Portland | 4 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Portland | 4 | 3 | 0 | 0 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Portland | 0 | 0 | 0 | 0 | 0 | 3 |
| Difference | — | — | — | — | — | — |
Cloud cover (%) Portland 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 |
| Portland | 76 | 74 | 76 | 75 | 70 | 64 | 43 | 43 | 49 | 63 | 75 | 78 |
| Difference | +37 | +35 | +34 | +25 | +17 | +5 | -6 | -3 | -2 | +12 | +29 | +37 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Portland | 76 | 74 | 76 | 75 | 70 | 64 |
| Difference | +37 | +35 | +34 | +25 | +17 | +5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Portland | 43 | 43 | 49 | 63 | 75 | 78 |
| Difference | -6 | -3 | -2 | +12 | +29 | +37 |
Relative humidity (%) Portland 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 |
| Portland | 92 | 89 | 87 | 84 | 82 | 80 | 72 | 66 | 68 | 79 | 89 | 92 |
| Difference | +16 | +14 | +12 | +8 | +5 | +2 | -7 | -13 | -11 | — | +10 | +15 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Portland | 92 | 89 | 87 | 84 | 82 | 80 |
| Difference | +16 | +14 | +12 | +8 | +5 | +2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Portland | 72 | 66 | 68 | 79 | 89 | 92 |
| Difference | -7 | -13 | -11 | — | +10 | +15 |
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 → · Portland trends →
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.
Portland
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Portland Intl AP (NOAA GHCN station USW00024229), about 10 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.
← change Castries · change Portland → · Castries page · Portland page