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January Weather in Grand Coulee, United States

Last updated: June 24, 2025

In January, the average temperature in Grand Coulee, United States hovers around -2°C (28°F), with a minimum dipping to -24°C (-11°F) and a maximum reaching up to 9°C (49°F). Visitors can expect about 67 mm (2.6 in) of precipitation spread over 11 days, and the air will feel quite moist with an average humidity of 85%.

January Temperature in Grand Coulee

In January in Grand Coulee, the average temperature is -2°C (28°F), with maximums reaching 9°C (49°F) and minimums dropping as low as -24°C (-11°F). Be sure to pack warm clothing and prepare for chilly weather if you're planning to travel during this time.

January Weather in Grand Coulee: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Grand Coulee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grand Coulee, January typically has an average temperature of -2°C (28°F), with highs reaching up to 9°C (49°F) and lows dropping to around -24°C (-11°F).
JanFebMarAprMayJunJulAugSepOctNovDec282839485967757362473729
Data source: Temperature data for Grand Coulee 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 Grand Coulee

In Grand Coulee in January, the total precipitation amount is 67 mm (2.6 in) over the course of 11 days.

January Precipitation Trends in Grand Coulee

The chart displays monthly precipitation patterns in Grand Coulee, 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 Grand Coulee, January typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec6747464037134824425157
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Grand Coulee

In Grand Coulee in January, humidity is 85%. With an average temperature of -2°C (28°F), this humidity feels like an icy grip that clings uncomfortably to your skin, making every step feel heavier and hastening the chill that seeps into your bones, discouraging long outdoor excursions and leaving you yearning for warmth and shelter.

January Average Humidity in Grand Coulee

This chart illustrates the average monthly humidity levels in Grand Coulee, 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 Grand Coulee is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%82%77%79%77%62%60%80%87%86%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Grand Coulee

In Grand Coulee 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 Grand Coulee, you can visit Hourly UV Index in Grand Coulee.

Maximum UV Index Levels in Grand Coulee for January

The chart shows the monthly maximum UV Index (UVI) for Grand Coulee 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 Grand Coulee typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245689997532
Data source: Grand Coulee 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 Grand Coulee Compares to Other Months

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

This table compares monthly weather conditions in Grand Coulee, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)67 mm (2.6 inches)85%low
February Weather-2°C (28°F)47 mm (1.9 inches)86%moderate
March Weather4°C (39°F)46 mm (1.8 inches)86%moderate
April Weather9°C (48°F)39 mm (1.6 inches)82%high
May Weather15°C (59°F)37 mm (1.4 inches)77%very high
June Weather20°C (68°F)13 mm (0.5 inches)79%very high
July Weather24°C (75°F)4 mm (0.1 inches)77%very high
August Weather23°C (74°F)8 mm (0.3 inches)62%very high
September Weather17°C (62°F)24 mm (1.0 inches)60%high
October Weather8°C (48°F)42 mm (1.7 inches)80%moderate
November Weather3°C (37°F)51 mm (2.0 inches)87%moderate
December Weather-2°C (29°F)57 mm (2.2 inches)86%low

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