January weather forecast
Saint Helena, CA

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Weather in January

January in Saint Helena, California, is a refreshing winter month, with an average temperature varying between 56.8°F (13.8°C) and 39.7°F (4.3°C).

Temperature

The shift into January reveals an average high-temperature of a moderate 56.8°F (13.8°C), closely mirroring December's climate. Saint Helena's nights in January experience an average temperature drop to a cold 39.7°F (4.3°C).

Humidity

In January, the average relative humidity is 74%.

Rainfall

In Saint Helena, in January, it is raining for 10.2 days, with typically 3.15" (80mm) of accumulated precipitation. In Saint Helena, during the entire year, the rain falls for 76.2 days and collects up to 16.93" (430mm) of precipitation.

Snowfall

January, February, April through December are months without snowfall.

Daylight

In January, the average length of the day in Saint Helena is 9h and 51min.
On the first day of the month, sunrise is at 7:27 am and sunset at 4:59 pm. On the last day of January, sunrise is at 7:16 am and sunset at 5:30 pm PST.

Sunshine

In January, the average sunshine is 5.4h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 3 during January translates into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
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Frequently asked questions

What is the temperature in January in Saint Helena?

In Saint Helena, 56.8°F (13.8°C) is the average high-temperature and 39.7°F (4.3°C) is the average low-temperature during January.

What is the average humidity in January in Saint Helena?

In January, the average relative humidity in Saint Helena, California, is 74%.

How much does it rain in Saint Helena in January?

In Saint Helena, in January, it is raining for 10.2 days, with typically 3.15" (80mm) of accumulated precipitation.

When it does not snow in Saint Helena?

January, February, April through December are months without snowfall in Saint Helena.

How many hours of daylight does Saint Helena have in January?

In January, the average day length is 9h and 51min.

What time are sunrise and sunset in January in Saint Helena?

On the first day of January, sunrise is at 7:27 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 5:30 pm PST.

How many hours of sunshine does Saint Helena have in January?

The average sunshine duration in January in Saint Helena, California, is 5.4h.

What is the month with the lowest UV index in Saint Helena?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Saint Helena.

What is the UV index intensity in January in Saint Helena?

In January, the average daily maximum UV index in Saint Helena is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average max. wind speed
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Saint Helena, CA

Average temperature in January - Saint Helena, CA
  • Average high temperature in January: 56.8°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (54.5°F).

  • Average low temperature in January: 39.7°F

The month with the highest average low temperature is September (54.3°F).
The coldest month (with the lowest average low temperature) is December (39.6°F).

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Average pressure in January
Saint Helena, CA

Average pressure in January - Saint Helena, CA
  • Average pressure in January: 30.14"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).

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Average wind speed in January
Saint Helena, CA

Average wind speed in January - Saint Helena, CA
  • Average wind speed in January: 4.5mph

The windiest month (with the highest average wind speed) is May (5.8mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).

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Average humidity in January
Saint Helena, CA

Average humidity in January - Saint Helena, CA
  • Average humidity in January: 74%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (53%).

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Average rainfall in January
Saint Helena, CA

Average rainfall in January - Saint Helena, CA
  • Average rainfall in January: 3.15"

The wettest month (with the highest rainfall) is February (3.7").
The driest month (with the least rainfall) is July (0").

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Average rainfall days in January
Saint Helena, CA

Average rainfall days in January - Saint Helena, CA
  • Average rainfall days in January: 10.2 days

The month with the highest number of rainy days is March (13.5 days).
The month with the least rainy days is August (0.3 days).

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Average snowfall in January
Saint Helena, CA

Average snowfall in January - Saint Helena, CA
  • Average snowfall in January: 0"

The month with the highest snowfall is March (0.04").
The months with the least snowfall are January, February, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in January
Saint Helena, CA

Average snowfall days in January - Saint Helena, CA
  • Average snowfall days in January: 0 days

The month with the highest number of snowfall days is March (0.2 days).
The months with the least snowfall days are January, February, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in January /
Average sunshine in January
Saint Helena, CA

Average daylight in January / Average sunshine in January - Saint Helena, CA
  • Average daylight in January: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in January: 5h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

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Average sunshine days in January
Saint Helena, CA

Average sunshine days in January - Saint Helena, CA
  • Average sunshine days in January: 19.9 days

The month with the most sunshine days is July (30 days).
The month with the least sunshine days is March (15.9 days).

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Average UV index in January
Saint Helena, CA

Average UV index in January - Saint Helena, CA
  • Average UV index in January: 3

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 3).

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Average cloud cover in January
Saint Helena, CA

Average cloud cover in January - Saint Helena, CA
  • Average cloud cover in January: 41

The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in January
Saint Helena, CA

Average visibility in January - Saint Helena, CA
  • Average visibility in January: 5mi

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

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Saint Helena, California, USA

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