Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The onset of December results in a small decrease in the average high-temperature, moderately receding from a moderately hot 77.7°F (25.4°C) in November to an agreeable 71.4°F (21.9°C). Nighttime temperature lowers to an average of 56.1°F (13.4°C) in December.Humidity
In December, the average relative humidity in San Juan is 68%.Rainfall
In San Juan, in December, it is raining for 6.3 days, with typically 0.47" (12mm) of accumulated precipitation. In San Juan, during the entire year, the rain falls for 94.1 days and collects up to 9.06" (230mm) of precipitation.Snowfall
In San Juan, snow does not fall in February through December.Daylight
December has the shortest days of the year, with an average of 10h and 30min of daylight.On the first day of December in San Juan, sunrise is at 7:03 am and sunset at 5:40 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 5:51 pm CST.
Sunshine
With an average of 5.5h of sunshine, December has the least sunshine of the year in San Juan.UV index
With an average maximum UV index of 4, December is the month with the lowest UV index. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A daily maximum UV index of 4 in December translates into the following instructions:
Prioritize safety - Suggestions to prevent sun damage are offered. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
What are the temperatures in San Juan in December?
What is the average humidity in December in San Juan?
How much does it rain in San Juan in December?
When it does not snow in San Juan?
Does it snow in San Juan in December?
What is the month with the shortest days in San Juan?
What is the average length of the day in December in San Juan?
What time are sunrise and sunset in December in San Juan?
What is the month with the least sunshine in San Juan?
How many hours of sunshine does San Juan have in December?
When is the lowest UV index in San Juan?
What is the UV index intensity in December in San Juan?
Average temperature in December
San Juan, TX
- Average high temperature in December: 71.4°F
The warmest month (with the highest average high temperature) is August (98.2°F).
The month with the lowest average high temperature is January (69.6°F).
- Average low temperature in December: 56.1°F
The month with the highest average low temperature is August (79.7°F).
The coldest month (with the lowest average low temperature) is January (53.4°F).
Average pressure in December
San Juan, TX
- Average pressure in December: 30.07"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 Juan, TX
- Average wind speed in December: 9.5mph
The windiest month (with the highest average wind speed) is May (12.4mph).
The calmest month (with the lowest average wind speed) is September (8.9mph).
Average humidity in December
San Juan, TX
- Average humidity in December: 68%
The month with the highest relative humidity is May (69%).
The month with the lowest relative humidity is August (59%).
Average rainfall in December
San Juan, TX
- Average rainfall in December: 0.47"
The wettest month (with the highest rainfall) is September (1.46").
The driest months (with the least rainfall) are January and February (0.31").
Average rainfall days in December
San Juan, TX
- Average rainfall days in December: 6.3 days
The month with the highest number of rainy days is September (15.1 days).
The month with the least rainy days is February (5.4 days).
Average snowfall in December
San Juan, TX
- Average snowfall in December: 0"
The month with the highest snowfall is January (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
San Juan, TX
- 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 Juan, 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 3min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in December
San Juan, TX
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is July (23 days).
The month with the least sunshine days is September (12.5 days).
Average UV index in December
San Juan, 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 Juan, TX
- Average cloud cover in December: 39
The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 18).
Average visibility in December
San Juan, 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 Juan, Texas, USA
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