December weather forecast
San Isidro, TX

Share

Weather in December

December, the first month of the winter in San Isidro, is still a pleasant month, with an average temperature fluctuating between 54.5°F (12.5°C) and 70.9°F (21.6°C).

Temperature

December ushers in a minute temperature change, with average high-temperatures reducing from November's moderately hot 77.5°F (25.3°C) to a pleasant 70.9°F (21.6°C). An average minimum temperature of 54.5°F (12.5°C) is recorded during the month of December.

Humidity

December is the most humid month, with an average relative humidity of 65%.

Rainfall

In San Isidro, in December, during 7.5 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, there are 98.5 rainfall days, and 13.11" (333mm) of precipitation is accumulated.

Snowfall

March through December are months without snowfall in San Isidro.

Daylight

The month with the shortest days is December, with an average of 10h and 30min of daylight.
On the first day of December, sunrise is at 7:05 am and sunset at 5:40 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:52 pm CST.

Sunshine

The month with the least sunshine is December, with an average of 5.8h of sunshine.

UV index

With an average maximum UV index of 4, December is the month with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.
Note: A daily maximum UV index of 4 in December translates into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average December temperature?

An average high-temperature, in December, in San Isidro, is 70.9°F (21.6°C) and the average low-temperature is 54.5°F (12.5°C). In October, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 95°F (35°C).

What is the most humid month?

The most humid month is December, with an average relative humidity of 65%.

What is the average humidity in December?

In December, the average relative humidity is 65%.

How many days does it rain in December?

In San Isidro, in December, it is raining for 7.5 days, with typically 0.79" (20mm) of accumulated precipitation.

When it does not snow?

March through December are months without snowfall in San Isidro.

Does it snow in December?

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

What is the month with the shortest days?

The month with the shortest days is December, with an average of 10h and 30min of daylight.

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

The average day length in December is 10h and 29min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 5:40 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:52 pm CST.

What is the month with the least sunshine?

The month with the least sunshine is December, with an average of 5.8h of sunshine.

How long on average sun shines in December?

In San Isidro, the average sunshine duration in December is 5.8h.

What is the month with the lowest UV index?

The month with the lowest UV index is December, with an average maximum UV index of 4.

How high is the UV index in December?

In December, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
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 Isidro, TX

Average temperature in December - San Isidro, TX
  • Average high temperature in December: 70.9°F

The warmest month (with the highest average high temperature) is August (100°F).
The month with the lowest average high temperature is January (69.8°F).

  • Average low temperature in December: 54.5°F

The month with the highest average low temperature is August (80.1°F).
The coldest month (with the lowest average low temperature) is January (52.7°F).

Average pressure in December
San Isidro, TX

Average pressure in December - San Isidro, TX
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are May and June (29.87"Hg).

Average wind speed in December
San Isidro, TX

Average wind speed in December - San Isidro, TX
  • Average wind speed in December: 9.2mph

The windiest month (with the highest average wind speed) is July (13.9mph).
The calmest month (with the lowest average wind speed) is December (9.2mph).

Average humidity in December
San Isidro, TX

Average humidity in December - San Isidro, TX
  • Average humidity in December: 65%

The month with the highest relative humidity is December (65%).
The month with the lowest relative humidity is August (53%).

Average rainfall in December
San Isidro, TX

Average rainfall in December - San Isidro, TX
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is September (2.56").
The driest month (with the least rainfall) is February (0.47").

Average rainfall days in December
San Isidro, TX

Average rainfall days in December - San Isidro, TX
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is September (15.3 days).
The month with the least rainy days is February (5.8 days).

Average snowfall days in December
San Isidro, TX

Average snowfall days in December - San Isidro, TX
  • Average snowfall days in December: 0 days

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

Average daylight in December /
Average sunshine in December
San Isidro, TX

Average daylight in December / Average sunshine in December - San Isidro, TX
  • Average daylight in December: 10h and 3min

The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).

  • Average sunshine in December: 5h and 5min

The months with the most sunshine are June and July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

Average sunshine days in December
San Isidro, TX

Average sunshine days in December - San Isidro, TX
  • Average sunshine days in December: 21.1 days

The months with the most sunshine days are July and August (22.6 days).
The month with the least sunshine days is September (12.9 days).

Average UV index in December
San Isidro, TX

Average UV index in December - San Isidro, TX
  • Average UV index in December: 4

The months with the highest UV index are July and August (UV index 8).
The month with the lowest UV index is December (UV index 4).

Average cloud cover in December
San Isidro, TX

Average cloud cover in December - San Isidro, TX
  • Average cloud cover in December: 36

The month with the most cloud cover is December (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 16).

Average visibility in December
San Isidro, TX

Average visibility in December - San Isidro, TX
  • 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 Isidro, Texas, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location