December weather forecast and climate
Middletown, CA

Weather in December

December, the first month of the winter, in Middletown, is also a fresh month, with temperature in the range of an average high of 54.7°F (12.6°C) and an average low of 39.4°F (4.1°C).

Temperature

With an average high-temperature of 54.7°F (12.6°C) and an average low-temperature of 39.4°F (4.1°C), December is the coldest month.

Humidity

In December, the average relative humidity is 73%.

Rainfall

In Middletown, during 11.2 rainfall days, 3.15" (80mm) of precipitation is typically accumulated. Throughout the year, in Middletown, California, there are 77 rainfall days, and 17.05" (433mm) of precipitation is accumulated.

Snowfall

In Middletown snow does not fall in January, March through December.

Daylight

December has the shortest days of the year in Middletown, California, with an average of 9.5h of daylight.

Sunshine

With an average of 5.5h of sunshine, December has the least sunshine of the year.

UV index

The month with the lowest UV index in Middletown is December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the coldest month in Middletown?

December is the coldest month in Middletown, California, with an average high-temperature of 54.7°F (12.6°C) and an average low-temperature of 39.4°F (4.1°C).

What is the temperature in December in Middletown?

In Middletown, California, in December, the average high-temperature is 54.7°F (12.6°C), and the average low-temperature is 39.4°F (4.1°C).

What is the average humidity in December in Middletown?

The average relative humidity in December in Middletown is 73%.

How much does it rain in Middletown in December?

In Middletown, California, during December, the rain falls for 11.2 days and regularly aggregates up to 3.15" (80mm) of precipitation.

When it does not snow in Middletown?

January, March through December are months without snowfall in Middletown.

What is the month with the shortest days in Middletown?

The month with the shortest days in Middletown is December, with an average of 9.5h of daylight.

How many hours of daylight does Middletown have in December?

The average length of the day in December in Middletown is 9.5h.

What is the month with the least sunshine in Middletown?

With an average of 5.5h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December in Middletown?

The average sunshine in December is 5.5h.

When is the lowest UV index in Middletown?

With an average maximum UV index of 2, December is the month with the lowest UV index in Middletown, California.

How high is the UV index in December in Middletown?

In Middletown, California, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to the Sun's UV rays.

Average temperature in December
Middletown, CA

Average temperature in December - Middletown, CA
  • Average high temperature in December: 54.7°F

The warmest month (with the highest average high temperature) is August (87.8°F).
The month with the lowest average high temperature is December (54.7°F).

  • Average low temperature in December: 39.4°F

The month with the highest average low temperature is July (55.4°F).
The coldest month (with the lowest average low temperature) is December (39.4°F).

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Average pressure in December
Middletown, CA

Average pressure in December - Middletown, CA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.91").

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Average wind speed in December
Middletown, CA

Average wind speed in December - Middletown, CA
  • Average wind speed in December: 4.5mph

The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).

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Average humidity in December
Middletown, CA

Average humidity in December - Middletown, CA
  • Average humidity in December: 73%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (53%).

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Average rainfall in December
Middletown, CA

Average rainfall in December - Middletown, CA
  • Average rainfall in December: 3.15"

The wettest month (with the highest rainfall) is February (3.78").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Middletown, CA

Average rainfall days in December - Middletown, CA
  • Average rainfall days in December: 11.2 days

The month with the highest number of rainy days is March (13.6 days).
The month with the least rainy days is August (0.8 days).

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Average snowfall in December
Middletown, CA

Average snowfall in December - Middletown, CA
  • Average snowfall in December: 0"

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

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Average snowfall days in December
Middletown, CA

Average snowfall days in December - Middletown, CA
  • Average snowfall days in December: 0 days

Months with the highest number of snowfall days are February and March (0.1 days).
Months with the least snowfall days are January, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in December /
Average sunshine in December
Middletown, CA

Average daylight in December / Average sunshine in December - Middletown, CA
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5.5h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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Average sunshine days in December
Middletown, CA

Average sunshine days in December - Middletown, CA
  • Average sunshine days in December: 18.9 days

The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (15.8 days).

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Average UV index in December
Middletown, CA

Average UV index in December - Middletown, CA
  • Average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 2).

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Average cloud cover in December
Middletown, CA

Average cloud cover in December - Middletown, CA
  • Average cloud cover in December: 40

The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 5).

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Average visibility in December
Middletown, CA

Average visibility in December - Middletown, CA
  • Average visibility in December: 6mi

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

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