Castiglione — Water Temperature in December

Water Temperature Range

14°C

minimum

18°C

average

20°C

maximum

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Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2025	2024	2023	2022
DEC 1	19°C	18°C	20°C	20°C
DEC 2	19°C	18°C	20°C	19°C
DEC 3	19°C	18°C	19°C	19°C
DEC 4	19°C	18°C	20°C	19°C
DEC 5	19°C	18°C	19°C	19°C
DEC 6	19°C	18°C	19°C	18°C
DEC 7	19°C	18°C	19°C	19°C
DEC 8	19°C	18°C	19°C	18°C
DEC 9	19°C	18°C	19°C	19°C
DEC 10	19°C	18°C	19°C	19°C
DEC 11	19°C	18°C	19°C	19°C
DEC 12	18°C	18°C	19°C	18°C
DEC 13	18°C	18°C	18°C	18°C
DEC 14	18°C	17°C	18°C	18°C
DEC 15	18°C	17°C	18°C	18°C
DEC 16	18°C	17°C	18°C	18°C
DEC 17	18°C	17°C	18°C	18°C
DEC 18	18°C	17°C	19°C	18°C
DEC 19	18°C	17°C	18°C	17°C
DEC 20	18°C	17°C	18°C	18°C
DEC 21	17°C	17°C	18°C	17°C
DEC 22	18°C	18°C	18°C	17°C
DEC 23	17°C	17°C	18°C	17°C
DEC 24	17°C	17°C	18°C	17°C
DEC 25	17°C	17°C	17°C	17°C
DEC 26	17°C	17°C	18°C	17°C
DEC 27	17°C	17°C	18°C	17°C
DEC 28	17°C	17°C	18°C	17°C
DEC 29	17°C	17°C	17°C	17°C
DEC 30	17°C	17°C	17°C	17°C
DEC 31	17°C	17°C	17°C	17°C

December: Climate and Swimming Opportunities

Average Night Air Temperature

6°C

Average Day Air Temperature

13°C

Precipitation Amount per Month

119 mm

Number of Rainy Days

Daylight per Day

9 hrs

Sunshine per Day

4 hrs

Average Wind Speed

15 km/h

Average Humidity

77%

With such a ratio between the average monthly temperatures of water and air, swimming usually feels uncomfortably cold. Even a short dip can leave you chilled, especially once you get out into the cool air.