Temperatures in December
It's cool in December in Siena with an average temperature of 12°C. Temperatures this month range from a low of 11°C to a high of 14°C. At night, you can expect temperatures between 2°C and 7°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Siena in December. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of December
The month of December starts in Siena with cool temperatures, averaging around 13°C during the day and nights close to 6°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-December
By mid-December, the average daytime temperature stays the same at 13°C, with nights close to 5°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
End of December
By the end of December, the average daytime temperature in Siena will be around 13°C, with nights close to 6°C. A shower might show up, but overall the weather will be dry and sunny.
Precipitation in December
In December, there is an average of 72 mm of precipitation, spread over 10 days. The wind speed is around 3 Bft, mostly coming from the East.
The average precipitation chance is 32% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in December for Siena. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Siena in December |
London | ||
|---|---|---|---|
 Average Temperature |
12°C | 9°C | |
 High Temp |
14°C | 11°C | |
| Low Temp |
11°C | 8°C | |
 Total Precipitation |
72 mm | 67 mm | |
| Rainy Days |
10 days | 10 days | |
November
UV index
The UV index is a maximum of 4 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Temperature records for Siena in December
With 22°C, Siena hit the highest temperature in the last 10 years in December 2023. The lowest daytime temperature in this month was 2°C in 2014. The extreme night temperatures ranged from a low of -4°C to a high of 15°C.
Check out the climate of Siena for all months and discover the best travel time
Curious about the climate in other parts of Italy? Check out the weather and climate in places like Tuscany, Sicily, Lake Garda, or have a look at other destinations in Italy.
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Daily Temperature in December in Siena
This chart shows the average daily temperatures, both day and night, for each day in December in Siena, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in December in Siena
The chart below shows the average daily precipitation in December for Siena, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for December, you can expect around 10 days of rain in Siena.
Daily UV Index in December in Siena
This chart shows the average daily UV index in December in Siena, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in December in Siena Over the Years
This chart shows the average temperature in December in Siena, measured in degrees Celsius, over the past years.
Total Precipitation in December in Siena Over the Years
This chart shows the average precipitation in December in Siena, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in December for Siena
Click on a specific day in December for detailed info on the typical weather on that day in Siena. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in December in Siena
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Average Weather in Siena by Month
Click on a month below to see detailed weather info for Siena. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
