Omarska climate — normals and trends
Omarska (Bosnia and Herzegovina) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 11.2 °C and it receives 900 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 (21.5 °C on average) and the coldest is January (-0.3 °C). Rainfall peaks in May.
Omarska averages 78 frost days, 23 hot days (≥ 30 °C) and 130 rainy days per year.
Omarska has warmed by +2.9 °C between 1940 and 2025, or +0.34 °C per decade. This trend is statistically significant.
The number of frost days there went from about 101 to 55 per year over the period.
The hottest day of the period reached 39.6 °C (on 19 August 1946) and the coldest -26.1 °C (on 15 February 1940).
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
OmarskaRepublika Srpska
- coords
- 44.89°, 16.90°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.2°C
Average daily high
16.1°C
Average daily low
6.8°C
Annual rainfall
900mm
Sunshine / day
8.5h
Mean relative humidity
77%
Average peak wind
9.8km/h
Seasonal range
21.8°C
Frost days (< 0 °C)
78 d/yr
Hot days (≥ 30 °C)
23 d/yr
Rainy days (≥ 1 mm)
130 d/yr
Annual snowfall
88.0 cm
Average feels-like high
15.1 °C
Average feels-like low
5.2 °C
Average peak gust
25.4 km/h
Tropical nights (≥ 20 °C)
4 d/yr
Solar radiation
12.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.9 °C
since 1940
+0.3 °C per decade · r² = 0.57 · 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
39.6 °C
19 August 1946
Coldest day
-26.1 °C
15 February 1940
Wettest day
67 mm
20 August 1972
Windiest day
31.3 km/h
10 April 1973
Strongest gust
77.0 km/h
10 April 1973
Hottest feels-like
42.4 °C
4 August 2017
Coldest feels-like
-30.8 °C
15 February 1940
Snowiest day
27.2 cm
4 February 1969
Sunniest day
14.8 h
21 June 2025
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 | 8.1 °C | +4.7 °C | 46 mm | -15 mm |
| Feb | 7.1 °C | +0.7 °C | 59 mm | -2 mm |
| Mar | 15.6 °C | +4.0 °C | 151 mm | +82 mm |
| Apr | 19.6 °C | +2.9 °C | 66 mm | -16 mm |
| May | 21.4 °C | +0.2 °C | 114 mm | +23 mm |
| Jun | 30.6 °C | +5.9 °C | 2 mm | -88 mm |
| Jul | 29.8 °C | +2.8 °C | 64 mm | -16 mm |
| Aug | 29.4 °C | +2.3 °C | 67 mm | -1 mm |
| Sep | 25.4 °C | +2.6 °C | 47 mm | -28 mm |
| Oct | 17.7 °C | +0.8 °C | 69 mm | +2 mm |
| Nov | 11.7 °C | +1.6 °C | 112 mm | +30 mm |
| Dec | 5.9 °C | +1.1 °C | 32 mm | -43 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 Omarska?
Omarska has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 11.2 °C and it receives 900 mm of precipitation per year.
What is the hottest day ever recorded in Omarska?
The hottest day measured in Omarska between 1940 and 2025 was 19 August 1946, reaching 39.6 °C.
What is the coldest day in Omarska?
The coldest day measured in Omarska between 1940 and 2025 was 15 February 1940, at -26.1 °C.
Does it snow in Omarska?
Yes. Omarska gets on average 88.0 cm of snow per year and has around 78 frost days.
Has the climate of Omarska warmed?
Yes: Omarska warmed by +2.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Omarska?
The wettest day measured in Omarska between 1940 and 2025 was 20 August 1972, with 67 mm of rain in 24 hours.
What was the windiest day in Omarska?
The windiest day measured in Omarska between 1940 and 2025 was 10 April 1973, with winds reaching 31.3 km/h.
What is the warmest month in Omarska?
The warmest month in Omarska is July (21.5 °C on average); the coldest is January (-0.3 °C).
How much does it rain in Omarska?
Omarska receives on average 900 mm of precipitation per year, spread over about 130 rainy days.
Is it sunny in Omarska?
Omarska gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.
What is the biggest single-day snowfall in Omarska?
The heaviest 24-hour snowfall measured in Omarska between 1940 and 2025 was 4 February 1969, with 27.2 cm.
Are there tropical nights in Omarska?
Yes: Omarska has on average 4 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Omarska?
In Omarska, between 1940 and 2025, the highest apparent temperature reached 42.4 °C on 4 August 2017, and the lowest was -30.8 °C on 15 February 1940.
Compare Omarska with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Omarska