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Weather & Climate in Guidonia Montecelio, Italy
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Guidonia Montecelio enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 46°F in January while summers reach 81°F in July. The area gets 312 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 39.5 inches. The city sits at an elevation of 302 feet.
Temperature
46°F Jan (8°C)
81°F Jul (27°C)
| Annual Average | 61.4°F |
| 14% above US avg | |
| January Average | 46°F (8°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 312 days/yr |
Geography
| Elevation | 302 ft (92 m) |
| Area | 45.6 sq mi (118.2 km²) |
| Population Density | 1,479/sq mi |
| Coordinates | 41.9936°N, 12.7224°W |
| Timezone | Europe/Rome |
Precipitation & Snow
Air Quality
Earthquake History
1,178 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.3.
| Apr 6, 2009 | 3 km SE of Sassa, Italy | M6.3 | 63 km | 9 km |
| Aug 24, 2016 | 5 km WNW of Accumoli, Italy | M6.2 | 90 km | 4 km |
| Sep 26, 1997 | 3 km SSE of Nocera Umbra, Italy | M6.0 | 122 km | 10 km |
| Sep 26, 1997 | 6 km WSW of Serravalle di Chienti, Italy | M5.7 | 118 km | 10 km |
| Jan 18, 2017 | 5 km ESE of Cittareale, Italy | M5.7 | 79 km | 7 km |
| Aug 24, 2016 | 5 km S of Castelsantangelo sul Nera, Italy | M5.6 | 101 km | 3 km |
| Jan 18, 2017 | 4 km SE of Cittareale, Italy | M5.6 | 76 km | 10 km |
| Oct 6, 1997 | 6 km E of Valtopina, Italy | M5.5 | 117 km | 10 km |
| Oct 14, 1997 | 8 km NNW of Sellano, Italy | M5.5 | 109 km | 10 km |
| Apr 7, 2009 | 1 km SW of San Panfilo d'Ocre, Italy | M5.5 | 69 km | 15 km |
| Mar 26, 1998 | 1 km E of Esanatoglia, Italy | M5.4 | 142 km | 10 km |
| Apr 9, 2009 | 5 km SE of Capitignano, Italy | M5.4 | 75 km | 15 km |
| Jan 18, 2017 | 4 km SW of Accumoli, Italy | M5.3 | 84 km | 10 km |
| Oct 3, 1997 | 3 km ENE of Valtopina, Italy | M5.3 | 120 km | 10 km |
| Oct 12, 1997 | 2 km NW of Sellano, Italy | M5.3 | 102 km | 10 km |
| Apr 3, 1998 | 8 km E of Valfabbrica, Italy | M5.2 | 130 km | 10 km |
| Jan 18, 2017 | 3 km N of Montereale, Italy | M5.2 | 76 km | 7 km |
| Apr 9, 2009 | 2 km ESE of Capitignano, Italy | M5.2 | 76 km | 3 km |
| Apr 6, 2009 | 5 km ENE of Pizzoli, Italy | M5.1 | 73 km | 9 km |
| Apr 13, 2009 | 5 km ESE of Capitignano, Italy | M5.0 | 78 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Colli Albani (29 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Colli Albani | Caldera | 949 m (3,114 ft) | Unknown | 29 km |
| Vulsini | Caldera | 800 m (2,625 ft) | -104 | 94 km |
| Ischia | Complex | 789 m (2,589 ft) | 1302 | 171 km |
| Campi Flegrei | Caldera | 458 m (1,503 ft) | 1538 | 176 km |
| Vesuvius | Stratovolcano | 1,281 m (4,203 ft) | 1944 | 193 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 46°F (8°C) | 3.2 in | Coldest |
| February | 47°F (8°C) | 3.0 in | |
| March | 51°F (10°C) | 2.6 in | |
| April | 55°F (13°C) | 2.7 in | |
| May | 63°F (17°C) | 2.1 in | |
| June | 71°F (22°C) | 1.6 in | |
| July | 81°F (27°C) | 1.0 in | Warmest, Driest |
| August | 77°F (25°C) | 1.7 in | |
| September | 70°F (21°C) | 3.0 in | |
| October | 62°F (16°C) | 4.0 in | |
| November | 52°F (11°C) | 4.7 in | Wettest |
| December | 47°F (8°C) | 3.8 in |
Guidonia Montecelio has a seasonal temperature swing of 35°F / from 46°F in January to 81°F in July. Total annual precipitation is 33.2 inches, with November being the wettest month (4.7") and July the driest (1.0").