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December Weather in Winchester, United States

Last updated: June 24, 2025

In Winchester, United States, the average temperature in December hovers around 4°C (39°F), with a minimum dipping as low as -15°C (5°F) and occasionally peaking at 19°C (66°F). Expect 120 mm (4.7 in) of precipitation spread over about 11 days, and with an average humidity of 87%, the air can feel rather damp. Prepare accordingly for a chilly and wet month!

December Temperature in Winchester

In December in Winchester, the average temperature is 4°C (39°F), with maximums reaching 19°C (66°F) and minimums dropping as low as -15°C (5°F). Travelers should be prepared for a wide temperature range and pack accordingly for both chilly and mild conditions.

December Weather in Winchester: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Winchester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Winchester, December typically has an average temperature of 4°C (39°F), with highs reaching up to 19°C (66°F) and lows dropping to around -15°C (5°F).
JanFebMarAprMayJunJulAugSepOctNovDec333745546573777470594439
Data source: Temperature data for Winchester generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Winchester

In Winchester in December, the precipitation amount is 120 mm (4.7 in) during a span of 11 days.

December Precipitation Trends in Winchester

The chart displays monthly precipitation patterns in Winchester, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Winchester, December typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec881231321361301461128410210595120
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Winchester

In Winchester in December, humidity is 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.

December Average Humidity in Winchester

This chart illustrates the average monthly humidity levels in Winchester, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Winchester is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Winchester

In Winchester in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Winchester, you can check the information here.

Maximum UV Index Levels in Winchester for December

The chart shows the monthly maximum UV Index (UVI) for Winchester in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Winchester typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
Data source: Winchester December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Winchester Compares to Other Months

Weather in Winchester varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Winchester, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Winchester, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)88 mm (3.5 inches)88%moderate
February Weather3°C (38°F)122 mm (4.8 inches)88%moderate
March Weather7°C (45°F)131 mm (5.2 inches)87%high
April Weather12°C (54°F)136 mm (5.4 inches)85%very high
May Weather19°C (66°F)130 mm (5.1 inches)81%very high
June Weather23°C (73°F)146 mm (5.7 inches)82%very high
July Weather25°C (77°F)112 mm (4.4 inches)81%very high
August Weather24°C (75°F)84 mm (3.3 inches)73%very high
September Weather21°C (70°F)102 mm (4.0 inches)73%very high
October Weather15°C (59°F)105 mm (4.1 inches)78%high
November Weather6°C (44°F)95 mm (3.8 inches)89%moderate
December Weather4°C (39°F)120 mm (4.7 inches)87%moderate

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