December weather forecast
San Mateo, FL

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Weather in December

The first month of the winter, December, is still a pleasant month in San Mateo, Florida, with an average temperature varying between 69.8°F (21°C) and 53.1°F (11.7°C).

Temperature

An average high-temperature of an agreeable 69.8°F (21°C) marks December, exhibiting a close resemblance to the conditions in November. San Mateo experiences an average low-temperature of 53.1°F (11.7°C) in the month of December.

Humidity

The months with the highest humidity are August, September and December, with an average relative humidity of 77%.

Rainfall

In San Mateo, in December, during 6.9 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. In San Mateo, during the entire year, the rain falls for 138.3 days and collects up to 12.76" (324mm) of precipitation.

Snowfall

February through December are months without snowfall.

Daylight

The month with the shortest days is December, with an average of 10h and 18min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 5:27 pm. On the last day of December, sunrise is at 7:21 am and sunset at 5:38 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 5.9h of sunshine.

UV index

January and December, with an average maximum UV index of 4, are months with the lowest UV index in San Mateo. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index of 4 during December leads to these instructions:
Heed the precautions - It is counselled to guard against solar damage. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Updated: Jul 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in San Mateo in December?

In San Mateo, 69.8°F (21°C) is the average high-temperature and 53.1°F (11.7°C) is the average low-temperature during December. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in October is appraised at 87.8°F (31°C).

What are the most humid months?

August, September and December, with an average relative humidity of 77%, are most humid months.

What is the average humidity in December?

The average relative humidity in December is 77%.

How much does it rain in December?

In San Mateo, Florida, in December, it is raining for 6.9 days, with typically 1.1" (28mm) of accumulated precipitation.

When it does not snow in San Mateo?

February through December are months without snowfall.

Does it snow in December?

In San Mateo, in December, it doesn't snow. In January, it regularly snows.

What is the month with the shortest days?

December has the shortest days of the year in San Mateo, with an average of 10h and 18min of daylight.

How many hours of daylight does San Mateo have in December?

In December, the average day length is 10h and 17min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 5:27 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 5:38 pm EST.

What is the month with the least sunshine?

With an average of 5.9h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December?

In San Mateo, the average sunshine duration in December is 5.9h.

When is the lowest UV index?

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

How high is the UV index in December?

In San Mateo, the average daily maximum UV index in December is 4. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
San Mateo, FL

Average temperature in December - San Mateo, FL
  • Average high temperature in December: 69.8°F

The warmest month (with the highest average high temperature) is August (91.9°F).
The month with the lowest average high temperature is January (65.8°F).

  • Average low temperature in December: 53.1°F

The month with the highest average low temperature is August (75.4°F).
The coldest month (with the lowest average low temperature) is January (48.2°F).

Average pressure in December
San Mateo, FL

Average pressure in December - San Mateo, FL
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).

Average wind speed in December
San Mateo, FL

Average wind speed in December - San Mateo, FL
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.2mph).

Average humidity in December
San Mateo, FL

Average humidity in December - San Mateo, FL
  • Average humidity in December: 77%

The months with the highest relative humidity are August, September and December (77%).
The month with the lowest relative humidity is March (70%).

Average rainfall in December
San Mateo, FL

Average rainfall in December - San Mateo, FL
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is July (2.09").
The driest month (with the least rainfall) is March (0.47").

Average rainfall days in December
San Mateo, FL

Average rainfall days in December - San Mateo, FL
  • Average rainfall days in December: 6.9 days

The month with the highest number of rainy days is August (18.8 days).
The month with the least rainy days is November (6.7 days).

Average snowfall days in December
San Mateo, FL

Average snowfall days in December - San Mateo, FL
  • Average snowfall days in December: 0 days

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

Average daylight in December /
Average sunshine in December
San Mateo, FL

Average daylight in December / Average sunshine in December - San Mateo, FL
  • Average daylight in December: 10h and 2min

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

  • Average sunshine in December: 5h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

Average sunshine days in December
San Mateo, FL

Average sunshine days in December - San Mateo, FL
  • Average sunshine days in December: 20.9 days

The month with the most sunshine days is January (21.3 days).
The month with the least sunshine days is June (9.3 days).

Average UV index in December
San Mateo, FL

Average UV index in December - San Mateo, FL
  • Average UV index in December: 4

The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 4).

Average cloud cover in December
San Mateo, FL

Average cloud cover in December - San Mateo, FL
  • Average cloud cover in December: 40

The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are May and July (Cloud cover 30).

Average visibility in December
San Mateo, FL

Average visibility in December - San Mateo, FL
  • 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).

San Mateo, Florida, USA

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