Climate averages 1991–2020
Acilia-Castel Fusano-Ostia Antica weather
in January.
A cool, moderately wet month: the coolest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cool month in Acilia-Castel Fusano-Ostia Antica: daytime highs average 12.0°C and nights cool to about 6.5°C. By daytime temperature it is the coolest month of the year.
Expect about 81 mm of rain on roughly 11 days, which makes January a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 31 min on an average January day.
The nearest other city in this atlas is Fiumicino (8 km away). In January its highs average 12.0°C, about as warm as Acilia-Castel Fusano-Ostia Antica, with 81 mm of rain.
Among the 79 cities listed in Italy, Acilia-Castel Fusano-Ostia Antica ranks joint 15th of 79 for the warmest January highs and joint 64th of 79 for the driest January (rainfall, lowest first). The mean January high of those 79 cities is 9.7°C; Acilia-Castel Fusano-Ostia Antica is 2.3°C warmer than that mean.
From January to February, average highs rise by 0.4°C to 12.3°C, and monthly rainfall falls from 81 mm to 79 mm.
The annual picture
January 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
Acilia-Castel Fusano-Ostia Antica climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 12.0°C6.5°C | 6.5°C | 81 | 10.5 | 9.510 h |
| February | 12.3°C6.4°C | 6.4°C | 79 | 9.7 | 10.611 h |
| March | 14.4°C8.2°C | 8.2°C | 72 | 8.6 | 11.912 h |
| April | 16.9°C10.6°C | 10.6°C | 61 | 8.0 | 13.313 h |
| May | 20.8°C14.5°C | 14.5°C | 40 | 6.0 | 14.515 h |
| June | 24.9°C18.4°C | 18.4°C | 22 | 3.3 | 15.215 h |
| July | 27.7°C21.2°C | 21.2°C | 15 | 1.8 | 14.915 h |
| August | 28.3°C21.8°C | 21.8°C | 21 | 2.6 | 13.914 h |
| September | 24.4°C18.6°C | 18.6°C | 86 | 7.8 | 12.513 h |
| October | 20.6°C15.3°C | 15.3°C | 131 | 10.4 | 11.111 h |
| November | 16.4°C11.5°C | 11.5°C | 161 | 13.3 | 9.910 h |
| December | 12.9°C7.9°C | 7.9°C | 115 | 11.7 | 9.29 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
January in nearby cities
- Fiumicino in JanuaryItaly · 8 kmHigh 12.0°C · Low 6.9°C · 81 mm rain
- Rome in JanuaryItaly · 21 kmHigh 11.5°C · Low 3.7°C · 63 mm rain
- Aprilia in JanuaryItaly · 33 kmHigh 11.6°C · Low 5.0°C · 86 mm rain
- Guidonia Montecelio in JanuaryItaly · 41 kmHigh 11.1°C · Low 2.0°C · 69 mm rain
- Latina in JanuaryItaly · 58 kmHigh 11.8°C · Low 4.4°C · 81 mm rain
- Terni in JanuaryItaly · 93 kmHigh 10.5°C · Low 2.2°C · 71 mm rain
- Perugia in JanuaryItaly · 150 kmHigh 7.2°C · Low -0.3°C · 57 mm rain
- Pescara in JanuaryItaly · 173 kmHigh 10.4°C · Low 3.4°C · 73 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 Acilia-Castel Fusano-Ostia Antica) is explained once on the Acilia-Castel Fusano-Ostia Antica year overview and on the Sources, method and limits page.
Fiumicino lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.