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January Weather in Horsham, United States

Last updated: June 24, 2025

In January, the average temperature in Horsham, United States hovers around 1°C (34°F). Expect minimums dipping as low as -17°C (2°F) and maximums climbing up to 19°C (67°F). Precipitation is quite common, with around 67 mm (2.6 in) falling over 8 days. Moreover, the average humidity remains high at 87%, making it a chilly and damp month.

January Temperature in Horsham

In January in Horsham, the average temperature is 1°C (34°F), with maximums reaching 19°C (67°F) and minimums dropping as low as -17°C (2°F). Travelers should be prepared for a wide range of temperatures and bring appropriate clothing for both warm and cold conditions.

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

The chart illustrates January temperature patterns in Horsham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Horsham, January typically has an average temperature of 1°C (34°F), with highs reaching up to 19°C (67°F) and lows dropping to around -17°C (2°F).
JanFebMarAprMayJunJulAugSepOctNovDec343743536372787570604538
Data source: Temperature data for Horsham 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 Horsham

In Horsham in January, the total precipitation amount is 67 mm (2.6 in) over the course of 8 days.

January Precipitation Trends in Horsham

The chart displays monthly precipitation patterns in Horsham, 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 Horsham, January typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec671081081051441041481559610584102
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Horsham

In Horsham in January humidity is 87%. With an average temperature of 1°C (34°F), this humidity feels like a chilling blanket enveloping you, making every step outside feel heavy and damp, and leaving you longing for warmth and comfort while traveling.

January Average Humidity in Horsham

This chart illustrates the average monthly humidity levels in Horsham, 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 Horsham is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%87%85%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Horsham

In Horsham in January, 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 Horsham, you can check the information here.

Maximum UV Index Levels in Horsham for January

The chart shows the monthly maximum UV Index (UVI) for Horsham 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 Horsham typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Horsham 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 Horsham Compares to Other Months

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

This table compares monthly weather conditions in Horsham, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)67 mm (2.6 inches)87%moderate
February Weather3°C (37°F)108 mm (4.3 inches)85%moderate
March Weather6°C (43°F)108 mm (4.3 inches)85%high
April Weather12°C (53°F)105 mm (4.1 inches)83%very high
May Weather17°C (63°F)144 mm (5.7 inches)75%very high
June Weather22°C (72°F)104 mm (4.1 inches)73%very high
July Weather25°C (78°F)148 mm (5.8 inches)65%very high
August Weather24°C (75°F)155 mm (6.1 inches)62%very high
September Weather21°C (70°F)96 mm (3.8 inches)66%very high
October Weather15°C (60°F)105 mm (4.2 inches)79%high
November Weather7°C (45°F)84 mm (3.3 inches)87%moderate
December Weather3°C (38°F)102 mm (4.0 inches)85%low

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