January weather forecast
Napa Junction, CA

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Weather in January

January in Napa Junction, California, is a mild winter month, with temperature in the range of an average high of 56.3°F (13.5°C) and an average low of 42.3°F (5.7°C).

Temperature

The arrival of January sees a recorded average high-temperature of a mild 56.3°F (13.5°C), showing little divergence from the previous month's conditions. In January, Napa Junction encounters an average low-temperature of 42.3°F (5.7°C) during the night.

Humidity

In Napa Junction, the average relative humidity in January is 73%.

Rainfall

In Napa Junction, in January, it is raining for 9 days, with typically 2.2" (56mm) of accumulated precipitation. Throughout the year, there are 68.2 rainfall days, and 11.93" (303mm) of precipitation is accumulated.

Daylight

In January, the average length of the day in Napa Junction is 9h and 52min.
On the first day of January, sunrise is at 7:25 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 5:30 pm PST.

Sunshine

In Napa Junction, the average sunshine in January is 5.9h.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: In January, the maximum UV index of 3 translates into these guidelines:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. 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 Napa Junction?

The average high-temperature, in January, in Napa Junction, is 56.3°F (13.5°C), while the average low-temperature is 42.3°F (5.7°C).

What is the average humidity in January in Napa Junction?

In Napa Junction, California, the average relative humidity in January is 73%.

How much does it rain in Napa Junction in January?

In Napa Junction, during January, the rain falls for 9 days and regularly aggregates up to 2.2" (56mm) of precipitation.

How many hours of daylight does Napa Junction have in January?

In Napa Junction, the average day length in January is 9h and 52min.

When is the sunrise / sunset in January in Napa Junction?

In January, on the first day of the month, sunrise is at 7:25 am and sunset at 4:59 pm. On the last day of the month, in Napa Junction, California, sunrise is at 7:14 am and sunset at 5:30 pm PST.

How long on average sun shines in January in Napa Junction?

The average sunshine duration in January in Napa Junction, California, is 5.9h.

What are the months with the lowest UV index in Napa Junction?

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

What is the UV index intensity in January in Napa Junction?

In Napa Junction, California, the average daily maximum UV index in January is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Napa Junction, CA

Average temperature in January - Napa Junction, CA
  • Average high temperature in January: 56.3°F

The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is December (54.9°F).

  • Average low temperature in January: 42.3°F

The month with the highest average low temperature is August (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (42.3°F).

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Average pressure in January
Napa Junction, CA

Average pressure in January - Napa Junction, CA
  • 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
Napa Junction, CA

Average wind speed in January - Napa Junction, CA
  • Average wind speed in January: 4.7mph

The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).

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Average humidity in January
Napa Junction, CA

Average humidity in January - Napa Junction, CA
  • Average humidity in January: 73%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (58%).

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Average rainfall in January
Napa Junction, CA

Average rainfall in January - Napa Junction, CA
  • Average rainfall in January: 2.2"

The wettest month (with the highest rainfall) is February (2.32").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in January
Napa Junction, CA

Average rainfall days in January - Napa Junction, CA
  • Average rainfall days in January: 9 days

The month with the highest number of rainy days is March (11.9 days).
The month with the least rainy days is August (0.9 days).

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Average daylight in January /
Average sunshine in January
Napa Junction, CA

Average daylight in January / Average sunshine in January - Napa Junction, 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 36min).

  • Average sunshine in January: 5h and 5min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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Average sunshine days in January
Napa Junction, CA

Average sunshine days in January - Napa Junction, CA
  • Average sunshine days in January: 21.3 days

The months with the most sunshine days are July and August (29.1 days).
The month with the least sunshine days is March (18.3 days).

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Average UV index in January
Napa Junction, CA

Average UV index in January - Napa Junction, 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
Napa Junction, CA

Average cloud cover in January - Napa Junction, CA
  • Average cloud cover in January: 35

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in January
Napa Junction, CA

Average visibility in January - Napa Junction, CA
  • Average visibility in January: 6mi

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

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Napa Junction, California, USA

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