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Ottawa vs Castries
Comparing Ottawa change · Castries change
Castries is the warmer of the two — about 37°F on the annual average; Castries is the wetter, with 41 in more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Ottawa and Castries, in everyday terms.
Summers
Castries has hotter summers
Ottawa: Warm
Castries: Warm
Winters
Castries has far milder winters
Ottawa: Very cold
Castries: Stays warm
Rain & snow
Castries is wetter
Ottawa: Moderate rainfall
Castries: Very wet
Sky
Castries is sunnier
Ottawa: Often cloudy
Castries: Fairly sunny
Month-by-month charts
Temperature
Castries is the warmer of the two — about 37°F on the annual average.
Precipitation
Castries is the wetter — about 41 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ottawa | 23 | 26 | 37 | 52 | 67 | 76 | 80 | 78 | 70 | 56 | 43 | 29 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +58 | +54 | +44 | +29 | +15 | +7 | +3 | +6 | +14 | +27 | +40 | +52 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Ottawa | 23 | 26 | 37 | 52 | 67 | 76 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Difference | +58 | +54 | +44 | +29 | +15 | +7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Ottawa | 80 | 78 | 70 | 56 | 43 | 29 |
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +3 | +6 | +14 | +27 | +40 | +52 |
Avg low (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ottawa | 7 | 9 | 20 | 34 | 47 | 56 | 61 | 59 | 51 | 40 | 29 | 17 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +71 | +68 | +58 | +44 | +33 | +24 | +20 | +23 | +31 | +42 | +51 | +63 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Ottawa | 7 | 9 | 20 | 34 | 47 | 56 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Difference | +71 | +68 | +58 | +44 | +33 | +24 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Ottawa | 61 | 59 | 51 | 40 | 29 | 17 |
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +20 | +23 | +31 | +42 | +51 | +63 |
Precipitation (in) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ottawa | 2.6 | 2.1 | 2.4 | 3.2 | 3.2 | 3.7 | 3.6 | 3.4 | 3.4 | 3.5 | 2.8 | 2.8 |
| 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 | +1.9 | +0.9 | +0.2 | +0.4 | +1.3 | +1.5 | +4.9 | +8.1 | +5.4 | +6.2 | +6.8 | +3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Ottawa | 2.6 | 2.1 | 2.4 | 3.2 | 3.2 | 3.7 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Difference | +1.9 | +0.9 | +0.2 | +0.4 | +1.3 | +1.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Ottawa | 3.6 | 3.4 | 3.4 | 3.5 | 2.8 | 2.8 |
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +4.9 | +8.1 | +5.4 | +6.2 | +6.8 | +3 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ottawa | 17.5 | 16.3 | 12.2 | 3 | 0 | 0 | 0 | 0 | 0 | 0.8 | 6.4 | 16.7 |
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Ottawa | 17.5 | 16.3 | 12.2 | 3 | 0 | 0 |
| Castries | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Ottawa | 0 | 0 | 0 | 0.8 | 6.4 | 16.7 |
| Castries | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — |
Cloud cover (%) Ottawa runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ottawa | 69 | 64 | 63 | 66 | 66 | 63 | 58 | 58 | 58 | 69 | 72 | 73 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -30 | -25 | -22 | -16 | -13 | -5 | -9 | -12 | -7 | -18 | -26 | -32 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Ottawa | 69 | 64 | 63 | 66 | 66 | 63 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -30 | -25 | -22 | -16 | -13 | -5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Ottawa | 58 | 58 | 58 | 69 | 72 | 73 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -9 | -12 | -7 | -18 | -26 | -32 |
Relative humidity (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ottawa | 95 | 95 | 88 | 78 | 77 | 78 | 79 | 78 | 78 | 80 | 85 | 92 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -20 | -20 | -13 | -2 | +1 | — | — | +1 | +1 | -1 | -6 | -16 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Ottawa | 95 | 95 | 88 | 78 | 77 | 78 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | -20 | -20 | -13 | -2 | +1 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Ottawa | 79 | 78 | 78 | 80 | 85 | 92 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | — | +1 | +1 | -1 | -6 | -16 |
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. Ottawa trends → · Castries trends →
Methodology & sources
Ottawa
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Ottawa Cda, a weather station, about 4 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.
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 Ottawa · change Castries → · Ottawa page · Castries page