December weather forecast and climate
Harmony, CA

Weather in December

The first month of the winter, December, is also a moderate month in Harmony, California, with average temperature fluctuating between 59.4°F (15.2°C) and 48.2°F (9°C).

Temperature

December is the coldest month, with an average high-temperature of 59.4°F (15.2°C) and an average low-temperature of 48.2°F (9°C).

Humidity

In Harmony, the average relative humidity in December is 67%.

Rainfall

The wettest months are March and December, with an average 1.3" (33mm) of rainfall.

Daylight

The month with the shortest days in Harmony is December, with an average of 9.8h of daylight.

Sunshine

December has the least sunshine of the year in Harmony, with an average of 6.3h of sunshine.

UV index

Months with the lowest UV index in Harmony 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 moderate threat to health 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 the skin and eye damage is obliged. 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.
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FAQ

What is the coldest month in Harmony?

With an average high-temperature of 59.4°F (15.2°C) and an average low-temperature of 48.2°F (9°C), December is the coldest month in Harmony, California.

What is the temperature in December in Harmony?

In Harmony, in December, the average high-temperature is 59.4°F (15.2°C), and the average low-temperature is 48.2°F (9°C).

What is the average humidity in December in Harmony?

In Harmony, the average relative humidity in December is 67%.

How many days does it rain in December in Harmony?

In December, in Harmony, California, the rain falls for 6.5 days. Throughout December, 1.3" (33mm) of precipitation is accumulated.

What is the rainiest month in Harmony?

Months with the most rainfall are March and December, with an average 1.3" (33mm) of precipitation.

What is the month with the shortest days in Harmony?

The month with the shortest days is December, with an average of 9.8h of daylight.

How many hours of daylight does Harmony have in December?

The average length of the day in December in Harmony, California, is 9.8h.

What is the month with the least sunshine in Harmony?

December has the least sunshine of the year, with an average of 6.3h of sunshine.

How long on average sun shines in December in Harmony?

The average sunshine in December in Harmony is 6.3h.

What are the months with the lowest UV index in Harmony?

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

What is the UV index intensity in December in Harmony?

In December, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.

Average temperature in December
Harmony, CA

Average temperature in December - Harmony, CA
  • Average high temperature in December: 59.4°F

The warmest month (with the highest average high temperature) is September (75.4°F).
The month with the lowest average high temperature is December (59.4°F).

  • Average low temperature in December: 48.2°F

The month with the highest average low temperature is September (59.9°F).
The coldest month (with the lowest average low temperature) is February (47.8°F).

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Average pressure in December
Harmony, CA

Average pressure in December - Harmony, CA
  • Average pressure in December: 30.1"

The month with the highest atmospheric pressure is January (30.12").
The month with the lowest atmospheric pressure is September (29.91").

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Average wind speed in December
Harmony, CA

Average wind speed in December - Harmony, CA
  • Average wind speed in December: 6.9mph

The windiest month (with the highest average wind speed) is May (8.6mph).
The calmest months (with the lowest average wind speed) are July, August, September, October and November (6.5mph).

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Average humidity in December
Harmony, CA

Average humidity in December - Harmony, CA
  • Average humidity in December: 67%

The month with the highest relative humidity is March (71%).
The month with the lowest relative humidity is October (61%).

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Average rainfall in December
Harmony, CA

Average rainfall in December - Harmony, CA
  • Average rainfall in December: 1.3"

The wettest months (with the highest rainfall) are March and December (1.3").
The driest months (with the least rainfall) are June and August (0.04").

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Average rainfall days in December
Harmony, CA

Average rainfall days in December - Harmony, CA
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is March (8.5 days).
The month with the least rainy days is August (0.8 days).

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

Average daylight in December / Average sunshine in December - Harmony, CA
  • Average daylight in December: 9.8h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in December: 6.3h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.3h).

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Average sunshine days in December
Harmony, CA

Average sunshine days in December - Harmony, CA
  • Average sunshine days in December: 23.8 days

The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is February (21.2 days).

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Average UV index in December
Harmony, CA

Average UV index in December - Harmony, CA
  • Average UV index in December: 4

The month with the highest UV index is August (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 December
Harmony, CA

Average cloud cover in December - Harmony, CA
  • Average cloud cover in December: 27

The month with the most cloud cover is March (Cloud cover 28).
Months with the least cloud cover are July, August and September (Cloud cover 8).

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Average visibility in December
Harmony, CA

Average visibility in December - Harmony, 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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