January weather forecast and climate
Tierrasanta, CA

Weather in January

January, the same as December, is another enjoyable winter month in Tierrasanta, California, with average temperature fluctuating between 64.9°F (18.3°C) and 51.4°F (10.8°C).

Temperature

In Tierrasanta, the average high-temperature is practically the same as in December - a still enjoyable 64.9°F (18.3°C). In Tierrasanta, the average low-temperature is 51.4°F (10.8°C).

Humidity

In January, the average relative humidity in Tierrasanta is 59%.

Rainfall

In Tierrasanta, in January, during 5.2 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. Throughout the year, there are 57.9 rainfall days, and 7.48" (190mm) of precipitation is accumulated.

Daylight

In Tierrasanta, California, the average length of the day is 10.3h.

Sunshine

In January, the average sunshine is 6.9h.

UV index

Months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Tierrasanta?

The average high-temperature, in January, is 64.9°F (18.3°C), while the average low-temperature is 51.4°F (10.8°C).

What is the average humidity in January in Tierrasanta?

The average relative humidity in January in Tierrasanta is 59%.

How many days does it rain in January in Tierrasanta?

In Tierrasanta, in January, during 5.2 rainfall days, 0.91" (23mm) of precipitation is typically accumulated.

How many hours of daylight does Tierrasanta have in January?

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

How many hours of sunshine does Tierrasanta have in January?

The average sunshine in January is 6.9h.

What is the month with the lowest UV index in Tierrasanta?

Months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4.

How high is the UV index in January in Tierrasanta?

In January, the average daily maximum UV index in Tierrasanta, California, is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in January
Tierrasanta, CA

Average temperature in January - Tierrasanta, CA
  • Average high temperature in January: 64.9°F

The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (63.5°F).

  • Average low temperature in January: 51.4°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).

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Average pressure in January
Tierrasanta, CA

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

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are June and September (29.88").

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Average wind speed in January
Tierrasanta, CA

Average wind speed in January - Tierrasanta, CA
  • Average wind speed in January: 5.1mph

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

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Average humidity in January
Tierrasanta, CA

Average humidity in January - Tierrasanta, CA
  • Average humidity in January: 59%

Months with the highest relative humidity are May and June (71%).
The month with the lowest relative humidity is November (57%).

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Average rainfall in January
Tierrasanta, CA

Average rainfall in January - Tierrasanta, CA
  • Average rainfall in January: 0.91"

The wettest month (with the highest rainfall) is February (1.46").
The driest month (with the least rainfall) is June (0.12").

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Average rainfall days in January
Tierrasanta, CA

Average rainfall days in January - Tierrasanta, CA
  • Average rainfall days in January: 5.2 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (2.2 days).

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

Average daylight in January / Average sunshine in January - Tierrasanta, 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

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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Average sunshine days in January
Tierrasanta, CA

Average sunshine days in January - Tierrasanta, CA
  • Average sunshine days in January: 24.8 days

The month with the most sunshine days is January (24.8 days).
The month with the least sunshine days is February (20.2 days).

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Average UV index in January
Tierrasanta, CA

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

Months with the highest UV index are July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).

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Average cloud cover in January
Tierrasanta, CA

Average cloud cover in January - Tierrasanta, 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 8).

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Average visibility in January
Tierrasanta, CA

Average visibility in January - Tierrasanta, 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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