Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average sea temperature in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January brings the lowest temperatures in Key West, with an average high of 72.7°F (22.6°C) and an average low of 68.5°F (20.3°C).Humidity
The average relative humidity in January in Key West is 76%.Rainfall
In Key West, in January, during 12.3 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. Throughout the year, there are 199.2 rainfall days, and 31.61" (803mm) of precipitation is accumulated.Ocean temperature
January and February, with an average ocean temperature of 71.2°F (21.8°C), are months with the coldest seawater.Note: The enjoyment of swimming decreases for most when the surface water temperature is 71.2°F (21.8°C). Breathing control becomes increasingly challenging as temperatures descend below 69.8°F (21°C).
Daylight
In January, the average length of the day is 10h and 49min.On the first day of January, sunrise is at 7:11 am and sunset at 5:49 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:11 pm EST.
Sunshine
The average sunshine in January is 7.2h.UV index
With an average maximum UV index of 5, January is the month with the lowest UV index. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 5 during January translates into the following directions:
Heed the precautions - Suggestions to avoid sunburn are made. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Experience reduced UV exposure by about half when donning a wide-brim hat. Notice! The reflection of water and sand increases the UV radiation significantly.
Frequently asked questions
What is the coldest time of year in Key West?
What are the temperatures in Key West in January?
What is the average humidity in January in Key West?
How many days does it rain in January in Key West?
When is the ocean coldest in Key West?
What is the ocean temperature in January in Key West?
How many hours of daylight does Key West have in January?
When is the sunrise / sunset in January in Key West?
How long on average sun shines in January in Key West?
What is the month with the lowest UV index in Key West?
What is the UV index intensity in January in Key West?
Average temperature in January
Key West, FL
- Average high temperature in January: 72.7°F
The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is January (72.7°F).
- Average low temperature in January: 68.5°F
The month with the highest average low temperature is August (82.9°F).
The coldest month (with the lowest average low temperature) is January (68.5°F).
Average pressure in January
Key West, FL
- Average pressure in January: 30.09"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are September and October (29.93"Hg).
Average wind speed in January
Key West, FL
- Average wind speed in January: 14.4mph
The windiest months (with the highest average wind speed) are January and November (14.4mph).
The calmest month (with the lowest average wind speed) is July (9.5mph).
Average humidity in January
Key West, FL
- Average humidity in January: 76%
The month with the highest relative humidity is February (78%).
The months with the lowest relative humidity are July, August and September (74%).
Average rainfall in January
Key West, FL
- Average rainfall in January: 1.34"
The wettest month (with the highest rainfall) is September (5.12").
The driest month (with the least rainfall) is March (0.67").
Average rainfall days in January
Key West, FL
- Average rainfall days in January: 12.3 days
The months with the highest number of rainy days are August and September (23.1 days).
The month with the least rainy days is February (11 days).
Average sea temperature in January
Key West, FL
- Average sea temperature in January: 71.2°F
The best month for swimming (with the highest average sea temperature) is August (86.9°F).
The coldest months (with the lowest average sea temperature) are January and February (71.2°F).
Average daylight in January /
Average sunshine in January
Key West, FL
- Average daylight in January: 10h and 5min
The month with the longest days is June (Average daylight: 13h and 36min).
The month with the shortest days is December (Average daylight: 10h and 36min).
- Average sunshine in January: 7h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 18min).
Average sunshine days in January
Key West, FL
- Average sunshine days in January: 14 days
The month with the most sunshine days is March (17 days).
The month with the least sunshine days is September (4.5 days).
Average UV index in January
Key West, FL
- Average UV index in January: 5
The months with the highest UV index are April, May, June, July, August, September and October (UV index 7).
The month with the lowest UV index is January (UV index 5).
Average cloud cover in January
Key West, FL
- Average cloud cover in January: 34
The month with the most cloud cover is January (Cloud cover 34).
The month with the least cloud cover is April (Cloud cover 23).
Average visibility in January
Key West, FL
- Average visibility in January: 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).
Key West, Florida, USA
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