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Castries vs Ulan Bator
Comparing Castries change · Ulan Bator change
Castries is the warmer of the two — about 28°C on the annual average; Castries is the wetter, with 1763 mm more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Castries and Ulan Bator, in everyday terms.
Summers
Castries has hotter summers
Castries: Warm
Ulan Bator: Mild
Winters
Castries has far milder winters
Castries: Stays warm
Ulan Bator: Bitterly cold
Rain & snow
Castries is much wetter
Castries: Very wet
Ulan Bator: Very dry
Sky
Castries is sunnier
Castries: Fairly sunny
Ulan Bator: Partly cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 28°C on the annual average.
Precipitation
Castries is the wetter — about 1763 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 |
| Ulan Bator | -16 | -10 | 0 | 10 | 17 | 23 | 25 | 23 | 17 | 8 | -5 | -14 |
| Difference | -42 | -36 | -27 | -17 | -11 | -5 | -3 | -6 | -12 | -21 | -33 | -41 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Ulan Bator | -16 | -10 | 0 | 10 | 17 | 23 |
| Difference | -42 | -36 | -27 | -17 | -11 | -5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Ulan Bator | 25 | 23 | 17 | 8 | -5 | -14 |
| Difference | -3 | -6 | -12 | -21 | -33 | -41 |
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 |
| Ulan Bator | -30 | -27 | -16 | -6 | 1 | 8 | 12 | 9 | 1 | -8 | -20 | -28 |
| Difference | -56 | -52 | -41 | -32 | -26 | -19 | -16 | -19 | -27 | -36 | -47 | -54 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Ulan Bator | -30 | -27 | -16 | -6 | 1 | 8 |
| Difference | -56 | -52 | -41 | -32 | -26 | -19 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Ulan Bator | 12 | 9 | 1 | -8 | -20 | -28 |
| Difference | -16 | -19 | -27 | -36 | -47 | -54 |
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 |
| Ulan Bator | 2 | 2 | 5 | 9 | 18 | 35 | 54 | 41 | 17 | 7 | 6 | 3 |
| Difference | -111 | -74 | -61 | -81 | -96 | -99 | -162 | -250 | -207 | -240 | -237 | -146 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Ulan Bator | 2 | 2 | 5 | 9 | 18 | 35 |
| Difference | -111 | -74 | -61 | -81 | -96 | -99 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Ulan Bator | 54 | 41 | 17 | 7 | 6 | 3 |
| Difference | -162 | -250 | -207 | -240 | -237 | -146 |
Cloud cover (%) Ulan Bator 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 |
| Ulan Bator | 41 | 46 | 52 | 57 | 60 | 66 | 66 | 60 | 52 | 49 | 50 | 50 |
| Difference | +3 | +7 | +10 | +8 | +8 | +7 | +17 | +13 | +2 | -2 | +4 | +9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Ulan Bator | 41 | 46 | 52 | 57 | 60 | 66 |
| Difference | +3 | +7 | +10 | +8 | +8 | +7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Ulan Bator | 66 | 60 | 52 | 49 | 50 | 50 |
| Difference | +17 | +13 | +2 | -2 | +4 | +9 |
Relative humidity (%) Varies through 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 |
| Ulan Bator | 90 | 85 | 69 | 53 | 50 | 53 | 59 | 63 | 61 | 66 | 80 | 89 |
| Difference | +14 | +10 | -6 | -23 | -28 | -26 | -19 | -16 | -17 | -13 | +1 | +12 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Ulan Bator | 90 | 85 | 69 | 53 | 50 | 53 |
| Difference | +14 | +10 | -6 | -23 | -28 | -26 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Ulan Bator | 59 | 63 | 61 | 66 | 80 | 89 |
| Difference | -19 | -16 | -17 | -13 | +1 | +12 |
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 → · Ulan Bator 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.
Ulan Bator
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Chinggis Khaan Intl / Buyant Ukhaa Intl, a weather station, about 11 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 Castries · change Ulan Bator → · Castries page · Ulan Bator page