January weather forecast and climate
Grass Valley, CA

Weather in January

January, like December, in Grass Valley, California, is another fresh winter month, with average temperature fluctuating between 38.3°F (3.5°C) and 53.8°F (12.1°C).

Temperature

In Grass Valley, California, the average high-temperature in January is practically the same as in December - a still fresh 53.8°F (12.1°C). In January, the average low-temperature is 38.3°F (3.5°C).

Humidity

The average relative humidity in Grass Valley is 69%.

Rainfall

In January, the rain falls for 10.3 days. Throughout January, 5.31" (135mm) of precipitation is accumulated. Throughout the year, there are 82 rainfall days, and 33.11" (841mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall. In Grass Valley, during January, snow falls for 0.7 days and regularly aggregates up to 1.42" (36mm) of snow. In Grass Valley, during the entire year, snow falls for 6.8 days, and aggregates up to 14.41" (366mm) of snow.

Daylight

In Grass Valley, the average length of the day is 9.8h.

Sunshine

With an average of 5.7h of sunshine, January has the least sunshine of the year.

UV index

The average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 in January transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in January in Grass Valley?

The average high-temperature, in January, in Grass Valley, California, is 53.8°F (12.1°C), while the average low-temperature is 38.3°F (3.5°C).

What is the average humidity in January in Grass Valley?

The average relative humidity in January in Grass Valley, California, is 69%.

How many days does it rain in January in Grass Valley?

In Grass Valley, California, in January, during 10.3 rainfall days, 5.31" (135mm) of precipitation is typically accumulated.

How much does it snow in Grass Valley in January?

In Grass Valley, in January, snow falls for 0.7 days, with typically accumulated 1.42" (36mm) of snow.

What is the average length of the day in January in Grass Valley?

In Grass Valley, California, the average length of the day in January is 9.8h.

What is the month with the least sunshine in Grass Valley?

The month with the least sunshine is January, with an average of 5.7h of sunshine.

How long on average sun shines in January in Grass Valley?

In Grass Valley, California, the average sunshine in January is 5.7h.

How high is the UV index in January in Grass Valley?

The average daily maximum UV index in January is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in January
Grass Valley, CA

Average temperature in January - Grass Valley, CA
  • Average high temperature in January: 53.8°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (51.3°F).

  • Average low temperature in January: 38.3°F

The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

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Average pressure in January
Grass Valley, CA

Average pressure in January - Grass Valley, CA
  • Average pressure in January: 30.17"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in January
Grass Valley, CA

Average wind speed in January - Grass Valley, CA
  • Average wind speed in January: 5.5mph

The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in January
Grass Valley, CA

Average humidity in January - Grass Valley, CA
  • Average humidity in January: 69%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (37%).

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Average rainfall in January
Grass Valley, CA

Average rainfall in January - Grass Valley, CA
  • Average rainfall in January: 5.31"

The wettest month (with the highest rainfall) is March (6.57").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in January
Grass Valley, CA

Average rainfall days in January - Grass Valley, CA
  • Average rainfall days in January: 10.3 days

The month with the highest number of rainy days is March (15.1 days).
The month with the least rainy days is July (1.1 days).

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Average snowfall in January
Grass Valley, CA

Average snowfall in January - Grass Valley, CA
  • Average snowfall in January: 1.42"

The month with the highest snowfall is February (6.42").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in January
Grass Valley, CA

Average snowfall days in January - Grass Valley, CA
  • Average snowfall days in January: 0.7 days

The month with the highest number of snowfall days is March (2.4 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in January /
Average sunshine in January
Grass Valley, CA

Average daylight in January / Average sunshine in January - Grass Valley, CA
  • Average daylight in January: 9.8h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in January: 5.7h

The month with the most sunshine is July (Average sunshine: 12.2h).
The month with the least sunshine is January (Average sunshine: 5.7h).

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Average sunshine days in January
Grass Valley, CA

Average sunshine days in January - Grass Valley, CA
  • Average sunshine days in January: 19.6 days

The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (14.8 days).

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Average UV index in January
Grass Valley, CA

Average UV index in January - Grass Valley, CA
  • Average UV index in January: 3

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 2).

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Average cloud cover in January
Grass Valley, CA

Average cloud cover in January - Grass Valley, CA
  • Average cloud cover in January: 35

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in January
Grass Valley, CA

Average visibility in January - Grass Valley, CA
  • Average visibility in January: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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