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Guidonia Montecelio, Italy climate
Csa Hot-summer Mediterranean
Guidonia Montecelio has a seasonal mild-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is August with an average daily high near 92°F, while the coldest is January averaging around 36°F at night. Around 36 inches of precipitation falls each year, peaking in November (5.2 inches) and easing off in August (1.4 inches).
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)Guidonia Montecelio climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 56 | 58 | 63 | 69 | 77 | 86 | 92 | 92 | 83 | 74 | 64 | 57 |
| Avg temp (°F) | 46 | 47 | 52 | 57 | 65 | 73 | 78 | 79 | 71 | 63 | 55 | 48 |
| Avg low (°F) | 36 | 37 | 41 | 46 | 53 | 60 | 64 | 65 | 59 | 52 | 45 | 38 |
| Precipitation (in) | 2.5 | 2.9 | 2.8 | 3.3 | 3.3 | 2.2 | 1.6 | 1.4 | 3.5 | 3.9 | 5.2 | 3.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 56 | 58 | 63 | 69 | 77 | 86 |
| Avg temp (°F) | 46 | 47 | 52 | 57 | 65 | 73 |
| Avg low (°F) | 36 | 37 | 41 | 46 | 53 | 60 |
| Precipitation (in) | 2.5 | 2.9 | 2.8 | 3.3 | 3.3 | 2.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 92 | 92 | 83 | 74 | 64 | 57 |
| Avg temp (°F) | 78 | 79 | 71 | 63 | 55 | 48 |
| Avg low (°F) | 64 | 65 | 59 | 52 | 45 | 38 |
| Precipitation (in) | 1.6 | 1.4 | 3.5 | 3.9 | 5.2 | 3.7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 58 | 54 | 54 | 53 | 46 | 34 | 21 | 23 | 40 | 49 | 58 | 57 |
| Relative humidity (%) | 81 | 78 | 76 | 72 | 68 | 62 | 55 | 54 | 64 | 73 | 80 | 81 |
| Wind speed (mph) | 4.9 | 5.3 | 5.6 | 5.5 | 5.1 | 4.9 | 5.1 | 4.9 | 5.0 | 5.0 | 5.4 | 5.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 58 | 54 | 54 | 53 | 46 | 34 |
| Relative humidity (%) | 81 | 78 | 76 | 72 | 68 | 62 |
| Wind speed (mph) | 4.9 | 5.3 | 5.6 | 5.5 | 5.1 | 4.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 21 | 23 | 40 | 49 | 58 | 57 |
| Relative humidity (%) | 55 | 54 | 64 | 73 | 80 | 81 |
| Wind speed (mph) | 5.1 | 4.9 | 5.0 | 5.0 | 5.4 | 5.2 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the WMO's CLINO 1991–2020 collection, measured at Guidonia, about 1 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.