December weather forecastSan Isidro, TX
December
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 10h and 30min
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 48min
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: 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: 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: 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: 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).
