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Trieste, Italy climate
Cfa Humid subtropical
Trieste has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 29°C, while the coldest is January averaging around 4°C at night. Around 951 mm of precipitation falls each year, peaking in November (118 mm) and easing off in January (52 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Trieste climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 14 | 18 | 22 | 27 | 29 | 29 | 24 | 19 | 14 | 10 |
| Avg temp (°C) | 6 | 7 | 10 | 14 | 19 | 23 | 25 | 25 | 21 | 16 | 12 | 8 |
| Avg low (°C) | 4 | 4 | 7 | 11 | 15 | 19 | 21 | 21 | 17 | 13 | 9 | 5 |
| Precipitation (mm) | 52 | 65 | 57 | 69 | 81 | 75 | 56 | 75 | 108 | 113 | 118 | 82 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 14 | 18 | 22 | 27 |
| Avg temp (°C) | 6 | 7 | 10 | 14 | 19 | 23 |
| Avg low (°C) | 4 | 4 | 7 | 11 | 15 | 19 |
| Precipitation (mm) | 52 | 65 | 57 | 69 | 81 | 75 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 24 | 19 | 14 | 10 |
| Avg temp (°C) | 25 | 25 | 21 | 16 | 12 | 8 |
| Avg low (°C) | 21 | 21 | 17 | 13 | 9 | 5 |
| Precipitation (mm) | 56 | 75 | 108 | 113 | 118 | 82 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 63 | 61 | 61 | 60 | 55 | 46 | 44 | 55 | 63 | 71 | 69 |
| Relative humidity (%) | 83 | 80 | 78 | 75 | 73 | 71 | 66 | 65 | 71 | 79 | 83 | 83 |
| Wind speed (m/s) | 2.4 | 2.5 | 2.3 | 2.0 | 1.9 | 1.8 | 1.7 | 1.8 | 2.1 | 2.3 | 2.4 | 2.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 63 | 61 | 61 | 60 | 55 |
| Relative humidity (%) | 83 | 80 | 78 | 75 | 73 | 71 |
| Wind speed (m/s) | 2.4 | 2.5 | 2.3 | 2.0 | 1.9 | 1.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 44 | 55 | 63 | 71 | 69 |
| Relative humidity (%) | 66 | 65 | 71 | 79 | 83 | 83 |
| Wind speed (m/s) | 1.7 | 1.8 | 2.1 | 2.3 | 2.4 | 2.5 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the WMO's CLINO 1991–2020 collection, measured at Trieste, about 3 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.