Ölgii climate — normals and trends
Ölgii (Mongolia) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is -2.8 °C and it receives 184 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (14.9 °C on average) and the coldest is January (-22.6 °C). Rainfall peaks in July.
Ölgii averages 232 frost days, 0 hot days (≥ 30 °C) and 45 rainy days per year.
Ölgii has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The number of frost days there went from about 238 to 226 per year over the period.
The hottest day of the period reached 31.9 °C (on 14 July 2004) and the coldest -44.1 °C (on 27 January 1969).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
ÖlgiiBayan-Ölgii Province
- coords
- 48.97°, 89.96°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
-2.8°C
Average daily high
3.2°C
Average daily low
-8.6°C
Annual rainfall
184mm
Sunshine / day
10.7h
Mean relative humidity
54%
Average peak wind
14.1km/h
Seasonal range
37.5°C
Frost days (< 0 °C)
232 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
45 d/yr
Annual snowfall
30.0 cm
Average feels-like high
-1.3 °C
Average feels-like low
-12.6 °C
Average peak gust
38.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
16.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.20 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
31.9 °C
14 July 2004
Coldest day
-44.1 °C
27 January 1969
Wettest day
36 mm
30 May 1996
Windiest day
43.0 km/h
1 May 1969
Strongest gust
111.2 km/h
17 May 1966
Hottest feels-like
28.6 °C
24 July 1953
Coldest feels-like
-49.0 °C
27 January 1969
Snowiest day
12.8 cm
31 May 1996
Sunniest day
16.0 h
17 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -15.2 °C | +0.6 °C | 1 mm | +0 mm |
| Feb | -12.0 °C | -0.6 °C | 1 mm | -1 mm |
| Mar | -3.8 °C | -0.7 °C | 3 mm | -2 mm |
| Apr | 9.8 °C | +3.7 °C | 9 mm | -5 mm |
| May | 15.6 °C | +2.6 °C | 9 mm | -14 mm |
| Jun | 22.2 °C | +3.7 °C | 16 mm | -23 mm |
| Jul | 23.0 °C | +2.9 °C | 15 mm | -29 mm |
| Aug | 19.1 °C | +0.6 °C | 20 mm | -13 mm |
| Sep | 13.0 °C | +0.6 °C | 17 mm | +1 mm |
| Oct | 0.5 °C | -2.8 °C | 9 mm | +3 mm |
| Nov | -6.7 °C | +1.4 °C | 8 mm | +5 mm |
| Dec | -13.2 °C | +2.3 °C | 1 mm | -1 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Ölgii?
Ölgii has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is -2.8 °C and it receives 184 mm of precipitation per year.
What is the hottest day ever recorded in Ölgii?
The hottest day measured in Ölgii between 1940 and 2025 was 14 July 2004, reaching 31.9 °C.
What is the coldest day in Ölgii?
The coldest day measured in Ölgii between 1940 and 2025 was 27 January 1969, at -44.1 °C.
Does it snow in Ölgii?
Yes. Ölgii gets on average 30.0 cm of snow per year and has around 232 frost days.
Has the climate of Ölgii warmed?
Yes: Ölgii warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ölgii?
The wettest day measured in Ölgii between 1940 and 2025 was 30 May 1996, with 36 mm of rain in 24 hours.
What was the windiest day in Ölgii?
The windiest day measured in Ölgii between 1940 and 2025 was 1 May 1969, with winds reaching 43.0 km/h.
What is the warmest month in Ölgii?
The warmest month in Ölgii is July (14.9 °C on average); the coldest is January (-22.6 °C).
How much does it rain in Ölgii?
Ölgii receives on average 184 mm of precipitation per year, spread over about 45 rainy days.
Is it sunny in Ölgii?
Ölgii gets on average 10.7 hours of sunshine per day, roughly 3,905 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ölgii?
The heaviest 24-hour snowfall measured in Ölgii between 1940 and 2025 was 31 May 1996, with 12.8 cm.
Are there tropical nights in Ölgii?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Ölgii.
What was the most extreme apparent temperature in Ölgii?
In Ölgii, between 1940 and 2025, the highest apparent temperature reached 28.6 °C on 24 July 1953, and the lowest was -49.0 °C on 27 January 1969.
Compare Ölgii with another city
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Nearby cities
The climate around Ölgii