December weather forecast and climate
McHenry, CA

Weather in December

The first month of the winter, December, is still a mild month in McHenry, California, with average temperature varying between 55.4°F (13°C) and 41°F (5°C).

Temperature

With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 41°F (5°C), December is the coldest month.

Humidity

In McHenry, the average relative humidity is 70%.

Rainfall

In December, the rain falls for 8.4 days. Throughout December, 1.46" (37mm) of precipitation is accumulated. In McHenry, during the entire year, the rain falls for 59.3 days and collects up to 8.23" (209mm) of precipitation.

Snowfall

December is the only month when snow falls in McHenry. December is the month with the most snowfall. Snow falls for 0.1 days and accumulates 0.04" (1mm) of snow.

Daylight

With an average of 9.6h of daylight, December has the shortest days of the year.

Sunshine

With an average of 6h of sunshine, December has the least sunshine of the year in McHenry.

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in McHenry?

With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 41°F (5°C), December is the coldest month.

What is the temperature in December in McHenry?

In December, in McHenry, California, the average high-temperature is 55.4°F (13°C), and the average low-temperature is 41°F (5°C).

What is the average humidity in December in McHenry?

The average relative humidity in December in McHenry, California, is 70%.

How much does it rain in McHenry in December?

In December, in McHenry, the rain falls for 8.4 days. Throughout December, 1.46" (37mm) of precipitation is accumulated.

When does it start snowing in McHenry?

December is the first month it typically snows. Throughout December, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

When does it snow the most in McHenry?

The month with the most snowfall is December when snow falls for 0.1 days and typically aggregates up to 0.04" (1mm) of snow.

What is the month with the shortest days in McHenry?

The month with the shortest days in McHenry is December, with an average of 9.6h of daylight.

How many hours of daylight does McHenry have in December?

In McHenry, California, the average length of the day in December is 9.6h.

What is the month with the least sunshine in McHenry?

The month with the least sunshine in McHenry, California, is December, with an average of 6h of sunshine.

How long on average sun shines in December in McHenry?

The average sunshine in December in McHenry is 6h.

When is the lowest UV index in McHenry?

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

What is the UV index intensity in December in McHenry?

The average daily maximum UV index in December in McHenry is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
McHenry, CA

Average temperature in December - McHenry, CA
  • Average high temperature in December: 55.4°F

The warmest month (with the highest average high temperature) is July (96.4°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in December: 41°F

The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is December (41°F).

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Average pressure in December
McHenry, CA

Average pressure in December - McHenry, CA
  • Average pressure in December: 30.12"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in December
McHenry, CA

Average wind speed in December - McHenry, CA
  • Average wind speed in December: 5.5mph

The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).

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Average humidity in December
McHenry, CA

Average humidity in December - McHenry, CA
  • Average humidity in December: 70%

The month with the highest relative humidity is January (72%).
The month with the lowest relative humidity is July (37%).

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Average rainfall in December
McHenry, CA

Average rainfall in December - McHenry, CA
  • Average rainfall in December: 1.46"

The wettest month (with the highest rainfall) is March (1.65").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
McHenry, CA

Average rainfall days in December - McHenry, CA
  • Average rainfall days in December: 8.4 days

The month with the highest number of rainy days is March (11.3 days).
The month with the least rainy days is August (0.7 days).

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Average snowfall in December
McHenry, CA

Average snowfall in December - McHenry, CA
  • Average snowfall in December: 0.04"

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

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Average snowfall days in December
McHenry, CA

Average snowfall days in December - McHenry, CA
  • Average snowfall days in December: 0.1 days

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

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

Average daylight in December / Average sunshine in December - McHenry, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 6h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days in December
McHenry, CA

Average sunshine days in December - McHenry, CA
  • Average sunshine days in December: 21.5 days

The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is March (18.7 days).

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Average UV index in December
McHenry, CA

Average UV index in December - McHenry, CA
  • Average UV index in December: 3

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
McHenry, CA

Average cloud cover in December - McHenry, CA
  • Average cloud cover in December: 32

The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in December
McHenry, CA

Average visibility in December - McHenry, CA
  • Average visibility in December: 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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