Ključ climate — normals and trends
Ključ (Bosnia and Herzegovina) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.7 °C and it receives 1,218 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 (18.3 °C on average) and the coldest is January (-1.8 °C). Rainfall peaks in May.
Ključ averages 105 frost days, 6 hot days (≥ 30 °C) and 159 rainy days per year.
Ključ has warmed by +3.2 °C between 1940 and 2025, or +0.37 °C per decade. This trend is statistically significant.
The number of frost days there went from about 129 to 81 per year over the period.
The hottest day of the period reached 36.0 °C (on 4 August 2017) 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
KljučFederation of Bosnia and Herzegovina
- coords
- 44.53°, 16.78°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.7°C
Average daily high
13.3°C
Average daily low
4.4°C
Annual rainfall
1,218mm
Sunshine / day
8.3h
Mean relative humidity
79%
Average peak wind
10.9km/h
Seasonal range
20.1°C
Frost days (< 0 °C)
105 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
159 d/yr
Annual snowfall
207.3 cm
Average feels-like high
11.7 °C
Average feels-like low
2.2 °C
Average peak gust
34.3 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
13.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.2 °C
since 1940
+0.4 °C per decade · r² = 0.63 · 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
36.0 °C
4 August 2017
Coldest day
-27.8 °C
24 January 1942
Wettest day
90 mm
24 July 1976
Windiest day
33.5 km/h
22 November 2024
Strongest gust
109.1 km/h
18 December 1968
Hottest feels-like
37.5 °C
8 July 2021
Coldest feels-like
-32.6 °C
24 January 1942
Snowiest day
40.9 cm
4 February 1969
Sunniest day
14.7 h
21 June 2025
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 | 6.2 °C | +4.3 °C | 56 mm | -28 mm |
| Feb | 6.0 °C | +2.0 °C | 74 mm | -12 mm |
| Mar | 12.3 °C | +4.1 °C | 207 mm | +110 mm |
| Apr | 15.8 °C | +2.7 °C | 115 mm | +2 mm |
| May | 18.1 °C | +0.4 °C | 133 mm | +11 mm |
| Jun | 27.3 °C | +6.1 °C | 6 mm | -113 mm |
| Jul | 27.1 °C | +3.7 °C | 96 mm | -8 mm |
| Aug | 25.7 °C | +2.1 °C | 79 mm | -17 mm |
| Sep | 22.9 °C | +3.2 °C | 68 mm | -29 mm |
| Oct | 14.3 °C | -0.2 °C | 85 mm | -3 mm |
| Nov | 10.2 °C | +1.8 °C | 155 mm | +44 mm |
| Dec | 6.4 °C | +2.9 °C | 35 mm | -67 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 Ključ?
Ključ has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.7 °C and it receives 1,218 mm of precipitation per year.
What is the hottest day ever recorded in Ključ?
The hottest day measured in Ključ between 1940 and 2025 was 4 August 2017, reaching 36.0 °C.
What is the coldest day in Ključ?
The coldest day measured in Ključ between 1940 and 2025 was 24 January 1942, at -27.8 °C.
Does it snow in Ključ?
Yes. Ključ gets on average 207.3 cm of snow per year and has around 105 frost days.
Has the climate of Ključ warmed?
Yes: Ključ warmed by +3.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ključ?
The wettest day measured in Ključ between 1940 and 2025 was 24 July 1976, with 90 mm of rain in 24 hours.
What was the windiest day in Ključ?
The windiest day measured in Ključ between 1940 and 2025 was 22 November 2024, with winds reaching 33.5 km/h.
What is the warmest month in Ključ?
The warmest month in Ključ is July (18.3 °C on average); the coldest is January (-1.8 °C).
How much does it rain in Ključ?
Ključ receives on average 1,218 mm of precipitation per year, spread over about 159 rainy days.
Is it sunny in Ključ?
Ključ gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ključ?
The heaviest 24-hour snowfall measured in Ključ between 1940 and 2025 was 4 February 1969, with 40.9 cm.
Are there tropical nights in Ključ?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Ključ.
What was the most extreme apparent temperature in Ključ?
In Ključ, between 1940 and 2025, the highest apparent temperature reached 37.5 °C on 8 July 2021, and the lowest was -32.6 °C on 24 January 1942.
Compare Ključ with another city
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Nearby cities
The climate around Ključ