May weather forecast and climate
Gretna, FL

Weather in May

The last month of the spring, May, is also a moderately hot month in Gretna, Florida, with temperature in the range of an average high of 85.6°F (29.8°C) and an average low of 64.9°F (18.3°C).

Temperature

In May, the average high-temperature marginally rises, from 78.8°F (26°C) in April, to a still moderately hot 85.6°F (29.8°C). In May, in Gretna, the average low-temperature is 64.9°F (18.3°C).

Heat index

The average heat index is appraised at a torrid 95°F (35°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, wind, clothing, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

May is the least humid month in Gretna, with an average relative humidity of 72%.

Rainfall

In Gretna, in May, it is raining for 15.1 days, with typically 2.8" (71mm) of accumulated precipitation. In Gretna, during the entire year, the rain falls for 184.9 days and collects up to 37.6" (955mm) of precipitation.

Snowfall

February through December are months without snowfall.

Daylight

In May, the average length of the day is 13.7h.

Sunshine

The average sunshine in Gretna is 10.3h.

UV index

May through August, 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 unsafe exposure to the UV radiation for ordinary individuals.
Note: In May, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in May in Gretna?

The average high-temperature, in May, is 85.6°F (29.8°C), while the average low-temperature is 64.9°F (18.3°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), that factores the actual air temperature with the relative humidity, in May is calculated to 95°F (35°C).

What is the least humid month in Gretna?

The least humid month in Gretna, Florida, is May, with an average relative humidity of 72%.

What is the average humidity in May in Gretna?

In Gretna, the average relative humidity in May is 72%.

How many days does it rain in May in Gretna?

In Gretna, Florida, in May, it is raining for 15.1 days, with typically 2.8" (71mm) of accumulated precipitation.

When it does not snow in Gretna?

In Gretna, Florida, snow does not fall in February through December.

What is the average length of the day in May in Gretna?

The average length of the day in May in Gretna, Florida, is 13.7h.

How long on average sun shines in May in Gretna?

The average sunshine in May in Gretna is 10.3h.

When is the highest UV index in Gretna?

Months with the highest UV index in Gretna are May through August, with an average maximum UV index of 7.

What is the UV index intensity in May in Gretna?

The average daily maximum UV index in May in Gretna is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in May
Gretna, FL

Average temperature in May - Gretna, FL
  • Average high temperature in May: 85.6°F

The warmest months (with the highest average high temperature) are July and August (90.7°F).
The month with the lowest average high temperature is January (60.4°F).

  • Average low temperature in May: 64.9°F

The month with the highest average low temperature is August (73.6°F).
The coldest month (with the lowest average low temperature) is January (42.3°F).

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Average pressure in May
Gretna, FL

Average pressure in May - Gretna, FL
  • Average pressure in May: 30.01"

The month with the highest atmospheric pressure is January (30.16").
Months with the lowest atmospheric pressure are June, August and September (29.98").

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Average wind speed in May
Gretna, FL

Average wind speed in May - Gretna, FL
  • Average wind speed in May: 5.5mph

The windiest months (with the highest average wind speed) are January and March (6.6mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in May
Gretna, FL

Average humidity in May - Gretna, FL
  • Average humidity in May: 72%

Months with the highest relative humidity are August and December (78%).
The month with the lowest relative humidity is May (72%).

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Average rainfall in May
Gretna, FL

Average rainfall in May - Gretna, FL
  • Average rainfall in May: 2.8"

The wettest month (with the highest rainfall) is August (5.08").
The driest month (with the least rainfall) is November (1.46").

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Average rainfall days in May
Gretna, FL

Average rainfall days in May - Gretna, FL
  • Average rainfall days in May: 15.1 days

The month with the highest number of rainy days is July (26.1 days).
The month with the least rainy days is November (8.1 days).

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Average snowfall in May
Gretna, FL

Average snowfall in May - Gretna, FL
  • Average snowfall in May: 0"

The month with the highest snowfall is January (0.04").
Months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in May
Gretna, FL

Average snowfall days in May - Gretna, FL
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (0.2 days).
Months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in May /
Average sunshine in May
Gretna, FL

Average daylight in May / Average sunshine in May - Gretna, FL
  • Average daylight in May: 13.7h

The month with the longest days is June (Average daylight: 14.1h).
The month with the shortest days is December (Average daylight: 10.2h).

  • Average sunshine in May: 10.3h

Months with the most sunshine are June and July (Average sunshine: 10.5h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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Average sunshine days in May
Gretna, FL

Average sunshine days in May - Gretna, FL
  • Average sunshine days in May: 14.2 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is July (3.4 days).

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Average UV index in May
Gretna, FL

Average UV index in May - Gretna, FL
  • Average UV index in May: 7

Months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).

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Average cloud cover in May
Gretna, FL

Average cloud cover in May - Gretna, FL
  • Average cloud cover in May: 29

The month with the most cloud cover is December (Cloud cover 43).
Months with the least cloud cover are May and October (Cloud cover 29).

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Average visibility in May
Gretna, FL

Average visibility in May - Gretna, FL
  • Average visibility in May: 6mi

Months with the highest visibility are January, February, March, April, May, June, October and November (6mi).
Months with the lowest visibility are July, August, September and December (5mi).

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