Temperatures in December
It's cold in December in Potomac with an average temperature of 9°C. Temperatures this month range from a low of 6°C to a high of 12°C. At night, you can expect temperatures between -2°C and 3°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Potomac 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 Potomac with cold temperatures, averaging around 10°C during the day and nights close to 2°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry.
Mid-December
By mid-December, the average daytime temperature drops to around 9°C, with nights close to 0°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of December
By the end of December, the average daytime temperature in Potomac will be around 9°C, with nights close to 1°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
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Precipitation in December
In December, there is an average of 127 mm of precipitation, spread over 9 days. Of the total precipitation, about 3,4 cm falls as snow in December. The wind speed is around 4 Bft, mostly coming from the Southwest.
The average precipitation chance is 28% 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 Potomac. 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.
Potomac in December |
London | ||
|---|---|---|---|
 Average Temperature |
9°C | 9°C | |
 High Temp |
12°C | 11°C | |
| Low Temp |
6°C | 8°C | |
 Total Precipitation |
127 mm | 67 mm | |
| Rainy Days |
9 days | 10 days | |
 Total Snowfall |
3,4 cm | 1,2 cm | |
| Snowy Days |
2 days | 1 day | |
November
UV index
The UV index is a maximum of 2 this month. That's a low value on the intensity scale of 1 to 11. The risk of sunburn is minimal at this time.
Is December a good time to visit Potomac?
After some sun? Then December isn’t the best time to be in Potomac. There’s too much chance of rain this month.
Temperature records for Potomac in December
With 22°C, Potomac hit the highest temperature in the last 10 years in December 2015. The lowest daytime temperature in this month was -8°C in 2022. The extreme night temperatures ranged from a low of -15°C to a high of 18°C.
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Daily Temperature in December in Potomac
This chart shows the average daily temperatures, both day and night, for each day in December in Potomac, 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 Potomac
The chart below shows the average daily precipitation in December for Potomac, 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 9 days of rain in Potomac.
Daily Snowfall in December in Potomac
This chart shows the average daily snowfall in December in Potomac, measured in centimetres. The bottom of the chart shows the days of the month. The data is based on historical measurements and gives an idea of the average snowfall in December.
Daily UV Index in December in Potomac
This chart shows the average daily UV index in December in Potomac, 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 Potomac Over the Years
This chart shows the average temperature in December in Potomac, measured in degrees Celsius, over the past years.
Total Precipitation in December in Potomac Over the Years
This chart shows the average precipitation in December in Potomac, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Snowfall in December in Potomac per year
This chart shows the average snowfall in December in Potomac, measured in centimetres, over the past years.
Daily climate in December for Potomac
Click on a specific day in December for detailed info on the typical weather on that day in Potomac. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in December in Potomac
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Average Weather in Potomac by Month
Click on a month below to see detailed weather info for Potomac. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
