December weather forecast
Nipomo, CA

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Weather in December

The first month of the winter, December, is also an enjoyable month in Nipomo, California, with an average temperature varying between 46°F (7.8°C) and 62.2°F (16.8°C).

Temperature

December, having an average high-temperature of 62.2°F (16.8°C) and an average low-temperature of 46°F (7.8°C), is the coldest month.

Humidity

In Nipomo, the average relative humidity in December is 61%.

Rainfall

In Nipomo, during December, the rain falls for 5.2 days and regularly aggregates up to 0.71" (18mm) of precipitation. Throughout the year, there are 39.5 rainfall days, and 5.51" (140mm) of precipitation is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 48min of daylight.
On the first day of December, sunrise is at 6:52 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 5:00 pm PST.

Sunshine

The average sunshine in December is 6.5h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 4 during December translates into these guidelines:
Act with care - Obligation to protect against skin and eye damage is highlighted. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.

Frequently asked questions

What part of the year is the coldest?

December is the month when Nipomo sees the average lowest temperatures, with a high of 62.2°F (16.8°C) and a low of 46°F (7.8°C).

What is the temperature in December?

In Nipomo, in December, the average high-temperature is 62.2°F (16.8°C), and the average low-temperature is 46°F (7.8°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 84.2°F (29°C).

What is the average humidity in December?

In Nipomo, the average relative humidity in December is 61%.

How much does it rain in December?

In Nipomo, in December, during 5.2 rainfall days, 0.71" (18mm) of precipitation is typically accumulated.

What is the month with the shortest days?

With an average of 9h and 48min of daylight, December has the shortest days of the year.

How many hours of daylight does Nipomo have in December?

In Nipomo, the average day length in December is 9h and 51min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 6:52 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 5:00 pm PST.

How long on average sun shines in December?

In Nipomo, the average sunshine duration in December is 6.5h.

When is the lowest UV index in Nipomo?

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

What is the UV index reading in December?

In December, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe 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 December
Nipomo, CA

Average temperature in December - Nipomo, CA
  • Average high temperature in December: 62.2°F

The warmest month (with the highest average high temperature) is September (82°F).
The month with the lowest average high temperature is December (62.2°F).

  • Average low temperature in December: 46°F

The month with the highest average low temperature is September (59.7°F).
The coldest month (with the lowest average low temperature) is February (45.1°F).

Average pressure in December
Nipomo, CA

Average pressure in December - Nipomo, CA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).

Average wind speed in December
Nipomo, CA

Average wind speed in December - Nipomo, CA
  • Average wind speed in December: 6mph

The windiest months (with the highest average wind speed) are April and May (6.6mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in December
Nipomo, CA

Average humidity in December - Nipomo, CA
  • Average humidity in December: 61%

The month with the highest relative humidity is March (67%).
The month with the lowest relative humidity is October (55%).

Average rainfall in December
Nipomo, CA

Average rainfall in December - Nipomo, CA
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is March (1.34").
The driest month (with the least rainfall) is June (0").

Average rainfall days in December
Nipomo, CA

Average rainfall days in December - Nipomo, CA
  • Average rainfall days in December: 5.2 days

The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (0.7 days).

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

Average daylight in December / Average sunshine in December - Nipomo, CA
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in December: 6h and 3min

The months with the most sunshine are June, July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 24min).

Average sunshine days in December
Nipomo, CA

Average sunshine days in December - Nipomo, CA
  • Average sunshine days in December: 25.1 days

The month with the most sunshine days is August (29.7 days).
The month with the least sunshine days is February (21.6 days).

Average UV index in December
Nipomo, CA

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

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, March, November and December (UV index 4).

Average cloud cover in December
Nipomo, CA

Average cloud cover in December - Nipomo, CA
  • Average cloud cover in December: 25

The months with the most cloud cover are February and March (Cloud cover 27).
The month with the least cloud cover is August (Cloud cover 6).

Average visibility in December
Nipomo, CA

Average visibility in December - Nipomo, CA
  • Average visibility in December: 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).

Nipomo, California, USA

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