The highest day temperature in December 2023 was 68°F. The lowest night temperature was 42°F. The average values for day and night temperatures during December were 55.0°F и 49.5°F respectivly.

The average sea surface temperature in December 2023 for Grottammare was 55.1°F. The maximum and minimum values were 51.0°F and 60.6°F respectively.

You can expect various weather conditions during December. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in December for Grottammare is 0.8 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 7.5 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Grottammare in December is 4.6 hours.