December weather forecast
Rancho Peñasquitos, CA

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Weather in December

December, the first month of the winter in Rancho Peñasquitos, is also an enjoyable month, with an average temperature ranging between max 63.9°F (17.7°C) and min 49.6°F (9.8°C).

Temperature

December, recording an average high temperature of 63.9°F (17.7°C) and a low temperature of 49.6°F (9.8°C), is Rancho Peñasquitos's coldest month.

Humidity

In Rancho Peñasquitos, the average relative humidity in December is 60%.

Rainfall

The month with the most rainfall in Rancho Peñasquitos is December, when the rain falls for 4.9 days and typically aggregates up to 0.63" (16mm) of precipitation.

Daylight

With an average of 10h and 0min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:33 am and sunset at 4:41 pm. On the last day of December, sunrise is at 6:51 am and sunset at 4:52 pm PST.

Sunshine

The months with the least sunshine are January and December, with an average of 6.8h of sunshine.

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 of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index of 4 during December translates into these guidelines:
Ensure safety - Sun damage prevention is strongly urged. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Updated: Jul 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

December is Rancho Peñasquitos's coldest month, registering average high temperatures of 63.9°F (17.7°C) and lows of 49.6°F (9.8°C).

What is the average December temperature?

In Rancho Peñasquitos, 63.9°F (17.7°C) is the average high-temperature and 49.6°F (9.8°C) is the average low-temperature during December. The average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is calculated to be 84.2°F (29°C).

What is the average humidity in December?

In Rancho Peñasquitos, the average relative humidity in December is 60%.

What is the wettest month?

December is the month with the most rainfall. Rain falls for 4.9 days and accumulates 0.63" (16mm) of precipitation.

How much does it rain in December?

In Rancho Peñasquitos, California, in December, during 4.9 rainfall days, 0.63" (16mm) of precipitation is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 10h and 0min of daylight.

What is the average length of the day in December?

In December, the average day length in Rancho Peñasquitos, California, is 10h and 1min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:33 am and sunset at 4:41 pm. On the last day of the month, in Rancho Peñasquitos, sunrise is at 6:51 am and sunset at 4:52 pm PST.

What is the month with the least sunshine?

January and December, with an average of 6.8h of sunshine, are months with the least sunshine.

How long on average sun shines in December?

The average sunshine duration in December is 6.8h.

What is the month with the lowest UV index in Rancho Peñasquitos?

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 Rancho Peñasquitos, the average daily maximum UV index in December is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Rancho Peñasquitos, CA

Average temperature in December - Rancho Peñasquitos, CA
  • Average high temperature in December: 63.9°F

The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (63.9°F).

  • Average low temperature in December: 49.6°F

The month with the highest average low temperature is August (65.3°F).
The coldest month (with the lowest average low temperature) is February (48.7°F).

Average pressure in December
Rancho Peñasquitos, CA

Average pressure in December - Rancho Peñasquitos, CA
  • Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

Average wind speed in December
Rancho Peñasquitos, CA

Average wind speed in December - Rancho Peñasquitos, CA
  • Average wind speed in December: 5.2mph

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 October (4.5mph).

Average humidity in December
Rancho Peñasquitos, CA

Average humidity in December - Rancho Peñasquitos, CA
  • Average humidity in December: 60%

The month with the highest relative humidity is May (70%).
The month with the lowest relative humidity is November (56%).

Average rainfall in December
Rancho Peñasquitos, CA

Average rainfall in December - Rancho Peñasquitos, CA
  • Average rainfall in December: 0.63"

The wettest month (with the highest rainfall) is December (0.63").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in December
Rancho Peñasquitos, CA

Average rainfall days in December - Rancho Peñasquitos, CA
  • Average rainfall days in December: 4.9 days

The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.3 days).

Average daylight in December /
Average sunshine in December
Rancho Peñasquitos, CA

Average daylight in December / Average sunshine in December - Rancho Peñasquitos, CA
  • Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 6h and 5min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 6h and 48min).

Average sunshine days in December
Rancho Peñasquitos, CA

Average sunshine days in December - Rancho Peñasquitos, CA
  • Average sunshine days in December: 24.5 days

The month with the most sunshine days is October (26.1 days).
The month with the least sunshine days is February (21.8 days).

Average UV index in December
Rancho Peñasquitos, CA

Average UV index in December - Rancho Peñasquitos, CA
  • Average UV index in December: 4

The months with the highest UV index are June, July, August and September (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
Rancho Peñasquitos, CA

Average cloud cover in December - Rancho Peñasquitos, CA
  • Average cloud cover in December: 23

The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 7).

Average visibility in December
Rancho Peñasquitos, CA

Average visibility in December - Rancho Peñasquitos, 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).

Rancho Peñasquitos, California, USA

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