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January Weather in West Allis, United States

Last updated: June 24, 2025

In January, the average temperature in West Allis, United States hovers around -4°C (25°F). Expect a chilly range, with minimums plummeting to -29°C (-20°F) and maximums reaching a mild 11°C (53°F). This month also brings 63 mm (2.5 in) of precipitation over approximately 8 days, contributing to a high average humidity of 85%. Prepare for a cold and damp experience!

January Temperature in West Allis

In January in West Allis, the average temperature is -4°C (25°F), with maximums reaching 11°C (53°F) and minimums plunging as low as -29°C (-20°F). Be prepared for a wide temperature range and pack accordingly for your travels.

January Weather in West Allis: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in West Allis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In West Allis, January typically has an average temperature of -4°C (25°F), with highs reaching up to 11°C (53°F) and lows dropping to around -29°C (-20°F).
JanFebMarAprMayJunJulAugSepOctNovDec252635435465727165533832
Data source: Temperature data for West Allis 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.

January Precipitation in West Allis

In West Allis in January, the precipitation amount is 63 mm (2.5 in) spread over 8 days.

January Precipitation Trends in West Allis

The chart displays monthly precipitation patterns in West Allis, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In West Allis, January typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec636068110138968275961215453
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in West Allis

In West Allis in January, humidity is 85%. With an average temperature of -4°C (25°F), this humidity feels like a damp chill clinging to your skin, making travel outside uncomfortable and leaving you feeling cold and clammy despite the freezing temperatures.

January Average Humidity in West Allis

This chart illustrates the average monthly humidity levels in West Allis, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in West Allis is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in West Allis

In West Allis in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in West Allis, you can visit Hourly UV Index in West Allis.

Maximum UV Index Levels in West Allis for January

The chart shows the monthly maximum UV Index (UVI) for West Allis in January, 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 January, the maximum UV index in West Allis typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: West Allis January 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 January Weather in West Allis Compares to Other Months

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

This table compares monthly weather conditions in West Allis, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)63 mm (2.5 inches)85%low
February Weather-4°C (26°F)60 mm (2.4 inches)85%moderate
March Weather2°C (36°F)68 mm (2.7 inches)85%moderate
April Weather6°C (44°F)109 mm (4.3 inches)85%very high
May Weather12°C (54°F)138 mm (5.4 inches)78%very high
June Weather18°C (66°F)96 mm (3.8 inches)80%very high
July Weather22°C (72°F)82 mm (3.2 inches)78%very high
August Weather22°C (72°F)75 mm (2.9 inches)76%very high
September Weather19°C (66°F)96 mm (3.8 inches)79%high
October Weather12°C (53°F)121 mm (4.8 inches)83%moderate
November Weather3°C (39°F)54 mm (2.1 inches)88%moderate
December Weather0°C (32°F)53 mm (2.1 inches)81%low

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