Climate averages 1991–2020
Ljubljana weather
in December.
A cold, wet month: the 11th warmest and the joint 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Ljubljana: daytime highs average 4.3°C and nights cool to about -1.9°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 90 mm of rain on roughly 9 days, which makes December a wet month (the joint 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 43 min on an average December day.
The nearest other city in this atlas is Klagenfurt am Wörthersee (66 km away). In December its highs average 3.6°C, 0.7°C cooler than Ljubljana, with 80 mm of rain.
Among the 2 cities listed in Slovenia, Ljubljana ranks 2nd of 2 for the warmest December highs and 2nd of 2 for the driest December (rainfall, lowest first). The mean December high of those 2 cities is 4.5°C; Ljubljana is 0.3°C cooler than that mean.
From December to January, average highs fall by 0.5°C to 3.7°C, and monthly rainfall falls from 90 mm to 59 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Ljubljana climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.7°C-2.7°C | -2.7°C | 59 | 8.0 | 9.19 h |
| February | 5.7°C-2.3°C | -2.3°C | 75 | 8.5 | 10.310 h |
| March | 10.3°C1.3°C | 1.3°C | 76 | 10.1 | 11.912 h |
| April | 15.1°C5.3°C | 5.3°C | 90 | 12.0 | 13.514 h |
| May | 19.3°C9.7°C | 9.7°C | 103 | 13.4 | 14.915 h |
| June | 23.2°C13.6°C | 13.6°C | 105 | 13.4 | 15.716 h |
| July | 25.3°C15.8°C | 15.8°C | 95 | 11.3 | 15.415 h |
| August | 25.2°C15.9°C | 15.9°C | 112 | 11.1 | 14.214 h |
| September | 19.8°C11.5°C | 11.5°C | 125 | 11.1 | 12.613 h |
| October | 14.6°C7.3°C | 7.3°C | 117 | 10.2 | 11.011 h |
| November | 9.1°C3.1°C | 3.1°C | 121 | 11.2 | 9.510 h |
| December, selected | 4.3°C-1.9°C | -1.9°C | 90 | 9.2 | 8.79 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Klagenfurt am Wörthersee in DecemberAustria · 66 kmHigh 3.6°C · Low -2.8°C · 80 mm rain
- Trieste in DecemberItaly · 72 kmHigh 8.0°C · Low 2.0°C · 129 mm rain
- Rijeka in DecemberCroatia · 81 kmHigh 7.7°C · Low 2.0°C · 169 mm rain
- Udine in DecemberItaly · 98 kmHigh 6.9°C · Low -1.0°C · 104 mm rain
- Maribor in DecemberSlovenia · 104 kmHigh 4.8°C · Low -1.9°C · 62 mm rain
- Zagreb in DecemberCroatia · 117 kmHigh 5.1°C · Low -1.2°C · 68 mm rain
- Graz in DecemberAustria · 134 kmHigh 3.6°C · Low -4.0°C · 45 mm rain
- Bihać in DecemberBosnia and Herzegovina · 174 kmHigh 6.3°C · Low -0.2°C · 116 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Ljubljana) is explained once on the Ljubljana year overview and on the Sources, method and limits page.