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 sea temperature 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 average high-temperature for December is an agreeable 69.6°F (20.9°C), closely aligning with the temperature of the preceding month. A consistent average low-temperature of 63°F (17.2°C), with a minor variance from the daytime highs, is noted during the nights of December.Humidity
In Port Isabel, Texas, the average relative humidity in December is 78%.Rainfall
In December, in Port Isabel, the rain falls for 12.8 days. Throughout December, 1.34" (34mm) of precipitation is accumulated. In Port Isabel, during the entire year, the rain falls for 143.2 days and collects up to 21.38" (543mm) of precipitation.Ocean temperature
In Port Isabel, Texas, the average seawater temperature in December is 71.2°F (21.8°C).Note: For most, swimming in 71.2°F (21.8°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).
Daylight
The month with the shortest days is December, with an average of 10h and 30min of daylight.On the first day of December in Port Isabel, Texas, sunrise is at 6:59 am and sunset at 5:36 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 5:48 pm CST.
Sunshine
December has the least sunshine of the year, with an average of 4.8h of sunshine.UV index
The months with the lowest UV index in Port Isabel are January, February and December, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: A maximum daily UV index of 5 during December morphs into the following directions:
Exercise prevention - Protecting skin and eyes from harm is required. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be attentive! The UV exposure is heightened with reflections from sand and water.
Frequently asked questions
What are December temperatures in Port Isabel?
What is the average humidity in December in Port Isabel?
How many days does it rain in December in Port Isabel?
What is the ocean temperature in December in Port Isabel?
What is the month with the shortest days in Port Isabel?
How many hours of daylight does Port Isabel have in December?
When are sunrise and sunset in December in Port Isabel?
What is the month with the least sunshine in Port Isabel?
How many hours of sunshine does Port Isabel have in December?
What are the months with the lowest UV index in Port Isabel?
What is the UV index intensity in December in Port Isabel?
Average temperature in December
Port Isabel, TX
- Average high temperature in December: 69.6°F
The warmest month (with the highest average high temperature) is August (88°F).
The month with the lowest average high temperature is January (67.1°F).
- Average low temperature in December: 63°F
The month with the highest average low temperature is August (82°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).
Average pressure in December
Port Isabel, TX
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are May and June (29.88"Hg).
Average wind speed in December
Port Isabel, TX
- Average wind speed in December: 13.5mph
The windiest month (with the highest average wind speed) is April (14.2mph).
The calmest month (with the lowest average wind speed) is September (10.9mph).
Average humidity in December
Port Isabel, TX
- Average humidity in December: 78%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Port Isabel, TX
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is September (4.13").
The driest month (with the least rainfall) is April (0.51").
Average rainfall days in December
Port Isabel, TX
- Average rainfall days in December: 12.8 days
The month with the highest number of rainy days is September (19.8 days).
The month with the least rainy days is March (8.2 days).
Average sea temperature in December
Port Isabel, TX
- Average sea temperature in December: 71.2°F
The best month for swimming (with the highest average sea temperature) is August (85.1°F).
The coldest month (with the lowest average sea temperature) is February (66.7°F).
Average daylight in December /
Average sunshine in December
Port Isabel, TX
- Average daylight in December: 10h and 3min
The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in December
Port Isabel, TX
- Average sunshine days in December: 14.9 days
The month with the most sunshine days is March (20.7 days).
The month with the least sunshine days is September (7.2 days).
Average UV index in December
Port Isabel, TX
- Average UV index in December: 5
The months with the highest UV index are April, May, June, July, August and September (UV index 7).
The months with the lowest UV index are January, February and December (UV index 5).
Average cloud cover in December
Port Isabel, TX
- Average cloud cover in December: 49
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in December
Port Isabel, 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).
Port Isabel, Texas, USA
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