January weather forecast
Yountville, CA

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Weather in January

January in Yountville, California, is a refreshing winter month, with an average temperature ranging between min 41.2°F (5.1°C) and max 55.9°F (13.3°C).

Temperature

Yountville's shift into January sets the average high-temperature at a refreshing 55.9°F (13.3°C), a figure that deviates only slightly from December's 54.5°F (12.5°C). An average nighttime temperature of 41.2°F (5.1°C) is recorded in Yountville during January.

Humidity

The average relative humidity in January in Yountville is 73%.

Rainfall

In January, the rain falls for 10.3 days. Throughout January, 3.03" (77mm) of precipitation is accumulated. In Yountville, during the entire year, the rain falls for 77.8 days and collects up to 16.02" (407mm) of precipitation.

Daylight

In January, the average length of the day in Yountville is 9h and 51min.
On the first day of January, sunrise is at 7:26 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 5:30 pm PST.

Sunshine

The average sunshine in January is 5.7h.

UV index

The months with the lowest UV index in Yountville are January, February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In January, the UV index of 3 transforms into the following advice:
Be vigilant - Preventing sunburn is recommended. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
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Frequently asked questions

What are January temperatures in Yountville?

In Yountville, in January, the average high-temperature is 55.9°F (13.3°C), and the average low-temperature is 41.2°F (5.1°C).

What is the average humidity in January in Yountville?

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

How much does it rain in Yountville in January?

In Yountville, California, in January, during 10.3 rainfall days, 3.03" (77mm) of precipitation is typically accumulated.

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

The average day length in January in Yountville is 9h and 51min.

When are sunrise and sunset in January in Yountville?

On the first day of January in Yountville, California, sunrise is at 7:26 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 5:30 pm PST.

How long on average sun shines in January in Yountville?

In Yountville, the average sunshine duration in January is 5.7h.

When is the lowest UV index in Yountville?

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

How high is the UV index in January in Yountville?

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

Average temperature in January
Yountville, CA

Average temperature in January - Yountville, CA
  • Average high temperature in January: 55.9°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is December (54.5°F).

  • Average low temperature in January: 41.2°F

The month with the highest average low temperature is August (55.4°F).
The coldest month (with the lowest average low temperature) is December (40.1°F).

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Average pressure in January
Yountville, CA

Average pressure in January - Yountville, 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 and August (29.91"Hg).

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Average wind speed in January
Yountville, CA

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

The windiest month (with the highest average wind speed) is May (6mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).

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Average humidity in January
Yountville, CA

Average humidity in January - Yountville, CA
  • Average humidity in January: 73%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (54%).

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Average rainfall in January
Yountville, CA

Average rainfall in January - Yountville, CA
  • Average rainfall in January: 3.03"

The wettest month (with the highest rainfall) is February (3.43").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in January
Yountville, CA

Average rainfall days in January - Yountville, CA
  • Average rainfall days in January: 10.3 days

The month with the highest number of rainy days is March (13.9 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
Yountville, CA

Average daylight in January / Average sunshine in January - Yountville, 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 4min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

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Average sunshine days in January
Yountville, CA

Average sunshine days in January - Yountville, CA
  • Average sunshine days in January: 19.6 days

The month with the most sunshine days is July (29.4 days).
The month with the least sunshine days is March (15.8 days).

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Average UV index in January
Yountville, CA

Average UV index in January - Yountville, 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
Yountville, CA

Average cloud cover in January - Yountville, CA
  • Average cloud cover in January: 37

The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is July (Cloud cover 6).

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Average visibility in January
Yountville, CA

Average visibility in January - Yountville, 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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Yountville, California, USA

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