Trn climate — normals and trends
Trn (Bosnia and Herzegovina) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.5 °C and it receives 981 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 (20.6 °C on average) and the coldest is January (-0.6 °C). Rainfall peaks in May.
Trn averages 85 frost days, 19 hot days (≥ 30 °C) and 134 rainy days per year.
Trn has warmed by +3.0 °C between 1940 and 2025, or +0.35 °C per decade. This trend is statistically significant.
The number of frost days there went from about 108 to 62 per year over the period.
The hottest day of the period reached 39.2 °C (on 19 August 1946) and the coldest -27.8 °C (on 24 January 1942).
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
TrnRepublika Srpska
- coords
- 44.86°, 17.24°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.5°C
Average daily high
15.5°C
Average daily low
6.0°C
Annual rainfall
981mm
Sunshine / day
8.5h
Mean relative humidity
78%
Average peak wind
10.0km/h
Seasonal range
21.2°C
Frost days (< 0 °C)
85 d/yr
Hot days (≥ 30 °C)
19 d/yr
Rainy days (≥ 1 mm)
134 d/yr
Annual snowfall
122.1 cm
Average feels-like high
14.5 °C
Average feels-like low
4.0 °C
Average peak gust
27.7 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
13.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.0 °C
since 1940
+0.4 °C per decade · r² = 0.60 · 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
39.2 °C
19 August 1946
Coldest day
-27.8 °C
24 January 1942
Wettest day
93 mm
17 July 2021
Windiest day
32.6 km/h
19 February 1996
Strongest gust
91.1 km/h
10 April 1973
Hottest feels-like
41.9 °C
12 July 2024
Coldest feels-like
-32.7 °C
24 January 1942
Snowiest day
33.3 cm
23 December 2024
Sunniest day
14.7 h
19 June 2022
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 | 7.7 °C | +4.5 °C | 44 mm | -24 mm |
| Feb | 7.0 °C | +1.0 °C | 61 mm | -6 mm |
| Mar | 14.9 °C | +4.0 °C | 186 mm | +108 mm |
| Apr | 18.9 °C | +2.9 °C | 87 mm | -7 mm |
| May | 20.8 °C | +0.4 °C | 118 mm | +16 mm |
| Jun | 30.4 °C | +6.5 °C | 3 mm | -96 mm |
| Jul | 29.8 °C | +3.6 °C | 56 mm | -30 mm |
| Aug | 28.8 °C | +2.5 °C | 61 mm | -11 mm |
| Sep | 25.0 °C | +2.9 °C | 48 mm | -29 mm |
| Oct | 17.0 °C | +0.5 °C | 63 mm | -7 mm |
| Nov | 11.9 °C | +1.9 °C | 128 mm | +40 mm |
| Dec | 6.5 °C | +1.8 °C | 34 mm | -48 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 Trn?
Trn has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 10.5 °C and it receives 981 mm of precipitation per year.
What is the hottest day ever recorded in Trn?
The hottest day measured in Trn between 1940 and 2025 was 19 August 1946, reaching 39.2 °C.
What is the coldest day in Trn?
The coldest day measured in Trn between 1940 and 2025 was 24 January 1942, at -27.8 °C.
Does it snow in Trn?
Yes. Trn gets on average 122.1 cm of snow per year and has around 85 frost days.
Has the climate of Trn warmed?
Yes: Trn warmed by +3.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Trn?
The wettest day measured in Trn between 1940 and 2025 was 17 July 2021, with 93 mm of rain in 24 hours.
What was the windiest day in Trn?
The windiest day measured in Trn between 1940 and 2025 was 19 February 1996, with winds reaching 32.6 km/h.
What is the warmest month in Trn?
The warmest month in Trn is July (20.6 °C on average); the coldest is January (-0.6 °C).
How much does it rain in Trn?
Trn receives on average 981 mm of precipitation per year, spread over about 134 rainy days.
Is it sunny in Trn?
Trn 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 Trn?
The heaviest 24-hour snowfall measured in Trn between 1940 and 2025 was 23 December 2024, with 33.3 cm.
Are there tropical nights in Trn?
Yes: Trn has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Trn?
In Trn, between 1940 and 2025, the highest apparent temperature reached 41.9 °C on 12 July 2024, and the lowest was -32.7 °C on 24 January 1942.
Compare Trn with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Trn