Climate zone: Moderate zone of the northern hemisphere
The climate in Slovenia is much more unsettled than in central Europe and offers varied seasons with deep winters and warm summers. It rarely gets really warm here and you can safely leave your swimwear at home. Due to the warmer temperatures the best time for traveling is from May to September. Winter athletes will find their favorite weather conditions from December to February.
› Duration of daylight and sunshine in Slovenia
hours of sunshine per day rainy days per month Precipitation in mm/day Relative humidity in % Water temperature Absolute humidity in g/m³ (approx.)
Temperature records of the last 45 years
The hottest temperature measured from 1975 to October 2020 was reported by the Ljubljana Bezigrad weather station. In August 2013 the record temperature of 40.2 °C was reported here. The hottest summer from July to September, based on all 2 weather stations in Slovenia below 2520 metres altitude, was recorded in 2011 with an average temperature of 21.1 °C. This average temperature will normally be measured every 4 to 6 hours, thus also including the nights. Normally, this value is 19.4 degrees Celsius. The average maximum daily temperature at that time was 27.5 °C.
The coldest day in these 45 years was reported by the weather station Ljubljana Bezigrad. Here the temperature dropped to -16.2 °C in January 2003. Ljubljana Bezigrad lies at an altitude of 298 meters above sea level. The coldest winter (January to March) was in 1985 with an average temperature of -1.1 °C. In Slovenia, it is usual to have about 4.2 degrees more at 3.1 °C for this three-month period.
Long-term development of temperatures from 1991 - 2019
In contrast to single record values, a long-term development cannot simply be brought about by all weather stations in the country. Both the number and the locations are constantly changing. A simply calculated average value would give a falsified result. If several measuring stations in particularly cold mountain or coastal regions are added in one year, the average would already decrease as a result of this alone. If a station fails during the summer or winter months, it does not provide any values and falsifies the average again. The subsequent long-term development was therefore reduced to only 1 measuring points in order to have actually comparable data over as long a period as possible.
In the years 1991 to 2019 there were only these 1 weather stations in the whole country, which reported continuous temperature values (Ljubljana Bezigrad). From these weather reports we have created a long-term development that shows the monthly average temperatures. The hottest month in this entire period was 2015 with 24.4 °C. 2017 was the coldest month with an average temperature of -3.2 °C.
The average annual temperature was about 10.8 °C in the years after 1991 and about 12.1 °C in the last years before 2019. So in less than 29 years it has increased by about 1.3 °C. This trend only applies to the selected 1 weather stations in Slovenia. A considerably more comprehensive evaluation of the global warming
has been provided separately.
More detailed information on global warming with a view by continent can also be found on our topic page on climate change
. Data basis: German Weather Service, individual values averaged and supplemented by own elements.