Climate averages 1991–2020
Trieste weather
in December.
A cool, wet month: the 11th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Trieste: daytime highs average 8.0°C and nights cool to about 2.0°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 129 mm of rain on roughly 10 days, which makes December a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 46 min on an average December day.
The nearest other city in this atlas is Udine (63 km away). In December its highs average 6.9°C, 1.1°C cooler than Trieste, with 104 mm of rain.
Among the 79 cities listed in Italy, Trieste ranks joint 53rd of 79 for the warmest December highs and 71st of 79 for the driest December (rainfall, lowest first). The mean December high of those 79 cities is 10.5°C; Trieste is 2.4°C cooler than that mean.
From December to January, average highs fall by 0.9°C to 7.2°C, and monthly rainfall falls from 129 mm to 90 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
Trieste climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.2°C1.1°C | 1.1°C | 90 | 9.5 | 9.19 h |
| February | 8.6°C1.1°C | 1.1°C | 97 | 8.7 | 10.310 h |
| March | 12.4°C4.1°C | 4.1°C | 101 | 9.7 | 11.912 h |
| April | 16.4°C7.8°C | 7.8°C | 110 | 12.1 | 13.513 h |
| May | 20.6°C12.3°C | 12.3°C | 122 | 13.0 | 14.915 h |
| June | 24.8°C16.4°C | 16.4°C | 111 | 12.1 | 15.616 h |
| July | 27.4°C18.7°C | 18.7°C | 87 | 10.7 | 15.315 h |
| August | 27.7°C18.9°C | 18.9°C | 111 | 10.2 | 14.114 h |
| September | 22.3°C14.8°C | 14.8°C | 170 | 11.4 | 12.613 h |
| October | 17.4°C10.8°C | 10.8°C | 184 | 13.0 | 11.011 h |
| November | 12.3°C6.5°C | 6.5°C | 195 | 13.2 | 9.510 h |
| December, selected | 8.0°C2.0°C | 2.0°C | 129 | 10.1 | 8.89 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
- Udine in DecemberItaly · 63 kmHigh 6.9°C · Low -1.0°C · 104 mm rain
- Rijeka in DecemberCroatia · 63 kmHigh 7.7°C · Low 2.0°C · 169 mm rain
- Ljubljana in DecemberSlovenia · 72 kmHigh 4.3°C · Low -1.9°C · 90 mm rain
- Klagenfurt am Wörthersee in DecemberAustria · 116 kmHigh 3.6°C · Low -2.8°C · 80 mm rain
- Treviso in DecemberItaly · 119 kmHigh 7.7°C · Low 0.3°C · 82 mm rain
- Mestre in DecemberItaly · 120 kmHigh 8.0°C · Low 2.0°C · 81 mm rain
- Padua in DecemberItaly · 150 kmHigh 7.9°C · Low 0.7°C · 71 mm rain
- Zagreb in DecemberCroatia · 172 kmHigh 5.1°C · Low -1.2°C · 68 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 Trieste) is explained once on the Trieste year overview and on the Sources, method and limits page.