Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
Keystone observes an average high-temperature of a still moderately hot 82.9°F (28.3°C) in May, barely different from 78.4°F (25.8°C) in April. Throughout the nights in May, an average low-temperature of 72.9°F (22.7°C) is noted.Heat index
The heat index for May is appraised at a tropical 89.6°F (32°C). Staying active during long-term exposure might result in a state of exhaustion and cause heat cramps.Research indicates the heat index considers values in shaded locales and with light winds. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a composite of temperature and humidity figures to convey how warm it feels. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
Humidity
May is the least humid month, with an average relative humidity of 72%.Rainfall
In Keystone, during May, the rain falls for 9.2 days and regularly aggregates up to 0.59" (15mm) of precipitation. Throughout the year, there are 120.5 rainfall days, and 9.45" (240mm) of precipitation is accumulated.Daylight
The average length of the day in May is 13h and 34min.On the first day of May, sunrise is at 6:49 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 6:33 am and sunset at 8:22 pm EDT.
Sunshine
The month with the most sunshine is May, with an average of 11.3h of sunshine.UV index
May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.Note: A maximum high UV index of 7 in May translates into the following recommendations:
Resist overexposure. Safeguarding from solar damage is indispensable. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is May?
What is the least humid month?
What is the average humidity in May?
How many days does it rain in May in Keystone?
What is the average length of the day in May?
What time are sunrise and sunset in May?
What month has the most sunshine?
How many hours of sunshine does Keystone have in May?
When is the highest UV index?
How high is the UV index in May in Keystone?
Average temperature in May
Keystone, FL
- Average high temperature in May: 82.9°F
The warmest month (with the highest average high temperature) is August (88.3°F).
The month with the lowest average high temperature is January (66°F).
- Average low temperature in May: 72.9°F
The month with the highest average low temperature is August (80.2°F).
The coldest month (with the lowest average low temperature) is January (54.5°F).
Average pressure in May
Keystone, FL
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).
Average wind speed in May
Keystone, FL
- Average wind speed in May: 8.1mph
The windiest months (with the highest average wind speed) are January, March and April (8.9mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).
Average humidity in May
Keystone, FL
- Average humidity in May: 72%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is May (72%).
Average rainfall in May
Keystone, FL
- Average rainfall in May: 0.59"
The wettest month (with the highest rainfall) is July (1.77").
The driest month (with the least rainfall) is March (0.2").
Average rainfall days in May
Keystone, FL
- Average rainfall days in May: 9.2 days
The month with the highest number of rainy days is August (17.9 days).
The month with the least rainy days is November (5.5 days).
Average daylight in May /
Average sunshine in May
Keystone, FL
- Average daylight in May: 13h and 4min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in May: 11h and 2min
The month with the most sunshine is May (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days in May
Keystone, FL
- Average sunshine days in May: 17.2 days
The month with the most sunshine days is January (23.4 days).
The month with the least sunshine days is July (6.7 days).
Average UV index in May
Keystone, FL
- Average UV index in May: 7
The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 4).
Average cloud cover in May
Keystone, FL
- Average cloud cover in May: 20
The months with the most cloud cover are January and December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 20).
Average visibility in May
Keystone, FL
- Average visibility in May: 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).
Keystone, Florida, USA
Weather forecast for your location
2. Allow the app to use your location