January weather forecast and climate
Johnstown, CA

Weather in January

January, the same as December, is another enjoyable winter month in Johnstown, California, with temperature in the range of an average high of 65.5°F (18.6°C) and an average low of 46.6°F (8.1°C).

Temperature

In January, the average high-temperature is essentially the same as in December - a still comfortable 65.5°F (18.6°C). In Johnstown, in January, the average low-temperature is 46.6°F (8.1°C).

Humidity

In January, the average relative humidity is 55%.

Rainfall

In Johnstown, during January, the rain falls for 4.7 days and regularly aggregates up to 0.55" (14mm) of precipitation. Throughout the year, in Johnstown, there are 49.6 rainfall days, and 5.16" (131mm) of precipitation is accumulated.

Daylight

In Johnstown, the average length of the day is 10.3h.

Sunshine

The average sunshine in January is 6.9h.

UV index

In January, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: In January, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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.
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FAQ

What is the temperature in January in Johnstown?

The average high-temperature, in January, is 65.5°F (18.6°C), while the average low-temperature is 46.6°F (8.1°C).

What is the average humidity in January in Johnstown?

In Johnstown, California, the average relative humidity in January is 55%.

How many days does it rain in January in Johnstown?

In Johnstown, California, during January, the rain falls for 4.7 days and regularly aggregates up to 0.55" (14mm) of precipitation.

What is the average length of the day in January in Johnstown?

In January, the average length of the day in Johnstown, California, is 10.3h.

How many hours of sunshine does Johnstown have in January?

In Johnstown, California, the average sunshine in January is 6.9h.

What is the UV index reading in January in Johnstown?

In Johnstown, the average daily maximum UV index in January is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in January
Johnstown, CA

Average temperature in January - Johnstown, CA
  • Average high temperature in January: 65.5°F

The warmest month (with the highest average high temperature) is August (85.5°F).
The month with the lowest average high temperature is December (63.7°F).

  • Average low temperature in January: 46.6°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (46°F).

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Average pressure in January
Johnstown, CA

Average pressure in January - Johnstown, CA
  • Average pressure in January: 30.09"

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.86").

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Average wind speed in January
Johnstown, CA

Average wind speed in January - Johnstown, CA
  • Average wind speed in January: 4.8mph

The windiest months (with the highest average wind speed) are April and May (5.3mph).
The calmest months (with the lowest average wind speed) are August, September and October (4.2mph).

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Average humidity in January
Johnstown, CA

Average humidity in January - Johnstown, CA
  • Average humidity in January: 55%

The month with the highest relative humidity is May (65%).
The month with the lowest relative humidity is November (52%).

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Average rainfall in January
Johnstown, CA

Average rainfall in January - Johnstown, CA
  • Average rainfall in January: 0.55"

The wettest month (with the highest rainfall) is February (1.06").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in January
Johnstown, CA

Average rainfall days in January - Johnstown, CA
  • Average rainfall days in January: 4.7 days

The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is June (1.4 days).

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Average daylight in January /
Average sunshine in January
Johnstown, CA

Average daylight in January / Average sunshine in January - Johnstown, CA
  • Average daylight in January: 10.3h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in January: 6.9h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in January
Johnstown, CA

Average sunshine days in January - Johnstown, CA
  • Average sunshine days in January: 25.1 days

The month with the most sunshine days is June (28 days).
The month with the least sunshine days is July (20.7 days).

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Average UV index in January
Johnstown, CA

Average UV index in January - Johnstown, CA
  • Average UV index in January: 4

Months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in January
Johnstown, CA

Average cloud cover in January - Johnstown, CA
  • Average cloud cover in January: 20

Months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in January
Johnstown, CA

Average visibility in January - Johnstown, 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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