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Castries vs Portland
Comparing Castries change · Portland change
Castries is the warmer of the two — about 26°F on the annual average; Castries is the wetter, with 40 in 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 26°F on the annual average.
Precipitation
Castries is the wetter — about 40 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 |
| Portland | 48 | 52 | 57 | 62 | 69 | 74 | 82 | 82 | 77 | 64 | 54 | 47 |
| Difference | -33 | -28 | -24 | -20 | -13 | -9 | -1 | -2 | -7 | -19 | -29 | -34 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Portland | 48 | 52 | 57 | 62 | 69 | 74 |
| Difference | -33 | -28 | -24 | -20 | -13 | -9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Portland | 82 | 82 | 77 | 64 | 54 | 47 |
| Difference | -1 | -2 | -7 | -19 | -29 | -34 |
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 |
| Portland | 36 | 37 | 40 | 44 | 49 | 54 | 59 | 59 | 54 | 47 | 41 | 36 |
| Difference | -42 | -41 | -38 | -35 | -31 | -27 | -23 | -23 | -28 | -35 | -40 | -43 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Portland | 36 | 37 | 40 | 44 | 49 | 54 |
| Difference | -42 | -41 | -38 | -35 | -31 | -27 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Portland | 59 | 59 | 54 | 47 | 41 | 36 |
| Difference | -23 | -23 | -28 | -35 | -40 | -43 |
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 |
| Portland | 5 | 3.7 | 4 | 2.9 | 2.5 | 1.6 | 0.5 | 0.5 | 1.5 | 3.4 | 5.5 | 5.8 |
| Difference | +0.6 | +0.7 | +1.4 | -0.6 | -2 | -3.6 | -8 | -10.9 | -7.3 | -6.3 | -4.1 | -0.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Portland | 5 | 3.7 | 4 | 2.9 | 2.5 | 1.6 |
| Difference | +0.6 | +0.7 | +1.4 | -0.6 | -2 | -3.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Portland | 0.5 | 0.5 | 1.5 | 3.4 | 5.5 | 5.8 |
| Difference | -8 | -10.9 | -7.3 | -6.3 | -4.1 | -0.1 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| Portland | 1.7 | 1.2 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.2 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Portland | 1.7 | 1.2 | 0.1 | 0 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Portland | 0 | 0 | 0 | 0 | 0 | 1.2 |
| 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