January weather forecast
San Jose, IL

Weather in January

January, like December, is another subzero cold winter month in San Jose, Illinois, with an average temperature varying between 19.8°F (-6.8°C) and 31.5°F (-0.3°C).

Temperature

The coldest month is January, with an average high-temperature of 31.5°F (-0.3°C) and an average low-temperature of 19.8°F (-6.8°C).

Humidity

In January, the average relative humidity is 80%.

Rainfall

In San Jose, Illinois, in January, during 5.3 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. Throughout the year, in San Jose, Illinois, there are 131.4 rainfall days, and 20.08" (510mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. January is the month with the most snowfall in San Jose. Snow falls for 8.4 days and accumulates 2.87" (73mm) of snow.

Daylight

In January, the average length of the day in San Jose is 9h and 41min.
On the first day of the month, sunrise is at 7:21 am and sunset at 4:42 pm. On the last day of January, in San Jose, sunrise is at 7:08 am and sunset at 5:15 pm CST.

Sunshine

With an average of 4h of sunshine, January has the least sunshine of the year.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in San Jose?

January is the coldest month, with an average high-temperature of 31.5°F (-0.3°C) and an average low-temperature of 19.8°F (-6.8°C).

What is the temperature in January in San Jose?

The average high-temperature, in January, in San Jose, is 31.5°F (-0.3°C), while the average low-temperature is 19.8°F (-6.8°C).

What is the average humidity in January in San Jose?

In January, the average relative humidity in San Jose is 80%.

How much does it rain in San Jose in January?

In January, in San Jose, the rain falls for 5.3 days. Throughout January, 1.06" (27mm) of precipitation is accumulated.

What is the snowiest month in San Jose?

January is the month with the most snowfall in San Jose. Snow falls for 8.4 days and accumulates 2.87" (73mm) of snow.

How many days does it snow in January in San Jose?

In San Jose, Illinois, during January, snow falls for 8.4 days and regularly aggregates up to 2.87" (73mm) of snow.

What is the average length of the day in January in San Jose?

In San Jose, the average day length in January is 9h and 41min.

When is the sunrise / sunset in January in San Jose?

On the first day of January, sunrise is at 7:21 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:15 pm CST.

What is the month with the least sunshine in San Jose?

January has the least sunshine of the year in San Jose, Illinois, with an average of 4h of sunshine.

How long on average sun shines in January in San Jose?

In San Jose, Illinois, the average sunshine duration in January is 4h.

When is the lowest UV index in San Jose?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in January in San Jose?

In San Jose, Illinois, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
San Jose, IL

Average temperature in January - San Jose, IL
  • Average high temperature in January: 31.5°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in January: 19.8°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in January
San Jose, IL

Average pressure in January - San Jose, IL
  • Average pressure in January: 30.14"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in January
San Jose, IL

Average wind speed in January - San Jose, IL
  • Average wind speed in January: 10.4mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

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Average humidity in January
San Jose, IL

Average humidity in January - San Jose, IL
  • Average humidity in January: 80%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in January
San Jose, IL

Average rainfall in January - San Jose, IL
  • Average rainfall in January: 1.06"

The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is February (1.02").

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Average rainfall days in January
San Jose, IL

Average rainfall days in January - San Jose, IL
  • Average rainfall days in January: 5.3 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (5.1 days).

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Average snowfall in January
San Jose, IL

Average snowfall in January - San Jose, IL
  • Average snowfall in January: 2.87"

The month with the highest snowfall is January (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in January
San Jose, IL

Average snowfall days in January - San Jose, IL
  • Average snowfall days in January: 8.4 days

The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in January /
Average sunshine in January
San Jose, IL

Average daylight in January / Average sunshine in January - San Jose, IL
  • Average daylight in January: 9h and 41min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 22min).

  • Average sunshine in January: 4h and 0min

The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days in January
San Jose, IL

Average sunshine days in January - San Jose, IL
  • Average sunshine days in January: 18.3 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (11.8 days).

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Average UV index in January
San Jose, IL

Average UV index in January - San Jose, IL
  • Average UV index in January: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in January
San Jose, IL

Average cloud cover in January - San Jose, IL
  • Average cloud cover in January: 57

The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).

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Average visibility in January
San Jose, IL

Average visibility in January - San Jose, IL
  • Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).

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