Arvayheer climate — normals and trends
Arvayheer (Mongolia) has a dry-winter subarctic climate (Dwc) under the Köppen-Geiger classification. Its mean annual temperature is 0.0 °C and it receives 289 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 (16.5 °C on average) and the coldest is January (-17.6 °C). Rainfall peaks in July.
Arvayheer averages 226 frost days, 1 hot days (≥ 30 °C) and 60 rainy days per year.
Arvayheer has warmed by +2.6 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 237 to 215 per year over the period.
The hottest day of the period reached 34.2 °C (on 15 July 2017) and the coldest -42.2 °C (on 8 February 1957).
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
ArvayheerÖvörhangay
- coords
- 46.26°, 102.78°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
0.0°C
Average daily high
6.8°C
Average daily low
-6.1°C
Annual rainfall
289mm
Sunshine / day
10.2h
Mean relative humidity
54%
Average peak wind
19.1km/h
Seasonal range
34.1°C
Frost days (< 0 °C)
226 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
60 d/yr
Annual snowfall
41.1 cm
Average feels-like high
2.6 °C
Average feels-like low
-10.4 °C
Average peak gust
36.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
15.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.44 · 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
34.2 °C
15 July 2017
Coldest day
-42.2 °C
8 February 1957
Wettest day
60 mm
14 June 1991
Windiest day
57.5 km/h
15 April 1998
Strongest gust
104.4 km/h
19 March 2010
Hottest feels-like
33.0 °C
22 July 1999
Coldest feels-like
-47.9 °C
8 February 1957
Snowiest day
27.4 cm
6 May 2002
Sunniest day
14.8 h
29 June 1952
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -6.4 °C | +3.7 °C | 2 mm | +1 mm |
| Feb | -5.0 °C | +2.0 °C | 1 mm | -2 mm |
| Mar | 2.5 °C | +2.0 °C | 13 mm | +5 mm |
| Apr | 12.9 °C | +4.6 °C | 6 mm | -10 mm |
| May | 15.8 °C | +0.7 °C | 38 mm | +9 mm |
| Jun | 22.2 °C | +1.9 °C | 24 mm | -25 mm |
| Jul | 24.9 °C | +2.9 °C | 60 mm | -14 mm |
| Aug | 21.9 °C | +1.5 °C | 45 mm | -19 mm |
| Sep | 16.4 °C | +1.3 °C | 27 mm | +1 mm |
| Oct | 4.5 °C | -2.9 °C | 7 mm | -4 mm |
| Nov | -1.3 °C | +0.9 °C | 15 mm | +10 mm |
| Dec | -6.2 °C | +2.4 °C | 2 mm | 0 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 Arvayheer?
Arvayheer has a dry-winter subarctic climate (Köppen Dwc). Over 1940-2025, the average annual temperature is 0.0 °C and it receives 289 mm of precipitation per year.
What is the hottest day ever recorded in Arvayheer?
The hottest day measured in Arvayheer between 1940 and 2025 was 15 July 2017, reaching 34.2 °C.
What is the coldest day in Arvayheer?
The coldest day measured in Arvayheer between 1940 and 2025 was 8 February 1957, at -42.2 °C.
Does it snow in Arvayheer?
Yes. Arvayheer gets on average 41.1 cm of snow per year and has around 226 frost days.
Has the climate of Arvayheer warmed?
Yes: Arvayheer warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Arvayheer?
The wettest day measured in Arvayheer between 1940 and 2025 was 14 June 1991, with 60 mm of rain in 24 hours.
What was the windiest day in Arvayheer?
The windiest day measured in Arvayheer between 1940 and 2025 was 15 April 1998, with winds reaching 57.5 km/h.
What is the warmest month in Arvayheer?
The warmest month in Arvayheer is July (16.5 °C on average); the coldest is January (-17.6 °C).
How much does it rain in Arvayheer?
Arvayheer receives on average 289 mm of precipitation per year, spread over about 60 rainy days.
Is it sunny in Arvayheer?
Arvayheer gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
What is the biggest single-day snowfall in Arvayheer?
The heaviest 24-hour snowfall measured in Arvayheer between 1940 and 2025 was 6 May 2002, with 27.4 cm.
Are there tropical nights in Arvayheer?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Arvayheer.
What was the most extreme apparent temperature in Arvayheer?
In Arvayheer, between 1940 and 2025, the highest apparent temperature reached 33.0 °C on 22 July 1999, and the lowest was -47.9 °C on 8 February 1957.
Compare Arvayheer with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Arvayheer