Weather in Nettuno: December
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Average day temperature: | 57.2°F |
| Average night temperature: | 51.4°F | |
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Sea water temperature: | 62.5°F |
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Number of sunny days: | 15 days |
| Day length: | 9.2 - 9.4 hours | |
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Number of rainy days: | 5 days |
| Precipitation totals: | 2.8 in. | |
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temperature
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Air temperature in December, °F
The highest day temperature during December of 2025 was 62°F. At the same time the lowest night temperature was 46°F. Daily and nightly averages during December were 57.3°F and 52.0°F.
Sea water temperature in Nettuno in December, °F
The average sea water temperature in December of 2025 was 62.4°F. The highest and lowest sea temperatures during the month were 63.9°F and 60.6°F.
Number of sunny, partly cloudy and cloudy days in December is almost equal.
Precipitation total in December, in.
Precipitation total value in Nettuno in December is 3.7 in. Other months of the year show relatively similar values.
The average wind speed value in December is 8.8 mph It makes December one of the most windy months of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in December is: 5.3.
Best time for vacation in Nettuno
Nettuno on a weather map
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