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January Weather in Alterswil, Switzerland

Last updated: August 27, 2025

In January, the average temperature in Alterswil, Switzerland hovers around -1°C (31°F), with minimum lows reaching -19°C (-2°F) and maximum highs of 14°C (58°F). Expect 105 mm (4.1 in) of precipitation spread over 11 days, contributing to a notably high average humidity of 91%. Remember to pack accordingly!

January Temperature in Alterswil

In January in Alterswil, average temperature is -1°C (31°F). Maximum can reach 14°C (58°F) and minimum can be as low as -19°C (-2°F). Travelers should be prepared for a wide range of temperatures, bringing both warm clothing and lighter layers.

January Weather in Alterswil: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Alterswil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alterswil, January typically has an average temperature of -1°C (31°F), with highs reaching up to 14°C (58°F) and lows dropping to around -19°C (-2°F).
JanFebMarAprMayJunJulAugSepOctNovDec313639465362646356483833
Data source: Temperature data for Alterswil 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 Alterswil

In Alterswil in January, the precipitation amount is 105 mm (4.1 in) over the course of 11 days.

January Precipitation Trends in Alterswil

The chart displays monthly precipitation patterns in Alterswil, 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 Alterswil, January typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec10593114711701431621438711391167
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Alterswil

In Alterswil in January, humidity is 91%. With an average temperature of -1°C (31°F), this humidity feels like an icy blanket that clings to your skin, making travel challenging as the cold dampness seeps into your bones, leaving you chilled and uncomfortable.

January Average Humidity in Alterswil

This chart illustrates the average monthly humidity levels in Alterswil, 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 Alterswil is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%87%84%80%82%82%77%81%89%89%91%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Alterswil

In Alterswil 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 Alterswil, you can visit Hourly UV Index in Alterswil.

Maximum UV Index Levels in Alterswil for January

The chart shows the monthly maximum UV Index (UVI) for Alterswil 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 Alterswil typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2367810986532
Data source: Alterswil 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 Alterswil Compares to Other Months

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

This table compares monthly weather conditions in Alterswil, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)105 mm (4.1 inches)91%low
February Weather2°C (36°F)93 mm (3.6 inches)89%moderate
March Weather4°C (40°F)114 mm (4.5 inches)87%high
April Weather8°C (46°F)71 mm (2.8 inches)84%high
May Weather11°C (53°F)170 mm (6.7 inches)80%very high
June Weather16°C (62°F)143 mm (5.6 inches)82%very high
July Weather18°C (64°F)162 mm (6.4 inches)82%very high
August Weather17°C (64°F)143 mm (5.6 inches)77%very high
September Weather14°C (57°F)87 mm (3.4 inches)81%high
October Weather9°C (49°F)113 mm (4.4 inches)89%moderate
November Weather4°C (39°F)91 mm (3.6 inches)89%moderate
December Weather1°C (33°F)166 mm (6.6 inches)91%low

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