May weather forecast and climate
Decatur, AL

The last month of the spring, May, is a moderately hot month in Decatur, Alabama, with average temperature fluctuating between 59.9°F (15.5°C) and 78.8°F (26°C).

Temperature

In May, the average high-temperature marginally rises, from an agreeable 70.5°F (21.4°C) in April, to a moderately hot 78.8°F (26°C). In Decatur, Alabama, the average low-temperature is 59.9°F (15.5°C).

Humidity

In May, the average relative humidity in Decatur is 76%.

Rainfall

In Decatur, during 16.9 rainfall days, 3.5" (89mm) of precipitation is typically accumulated. Throughout the year, in Decatur, there are 177.6 rainfall days, and 43.11" (1095mm) of precipitation is accumulated.

Snowfall

In Decatur snow does not fall in April through October.

Daylight

In May, the average length of the day is 14h.

Sunshine

In Decatur, the average sunshine is 9.7h.

UV index

Months with the highest UV index in Decatur are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to the UV radiation for average individuals.
Note: In May, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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.

What is the temperature in May in Decatur?

In Decatur, in May, the average high-temperature is 78.8°F (26°C), and the average low-temperature is 59.9°F (15.5°C).

What is the average humidity in May in Decatur?

In Decatur, Alabama, the average relative humidity in May is 76%.

How much does it rain in Decatur in May?

In Decatur, Alabama, in May, during 16.9 rainfall days, 3.5" (89mm) of precipitation is typically accumulated.

When it does not snow in Decatur?

In Decatur snow does not fall in April through October.

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

The average length of the day in May is 14h.

How long on average sun shines in May in Decatur?

The average sunshine in May is 9.7h.

What are the months with the highest UV index in Decatur?

May through August, with an average maximum UV index of 6, are months with the highest UV index in Decatur, Alabama.

How high is the UV index in May in Decatur?

In Decatur, Alabama, the average daily maximum UV index in May is 6. 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 - Decatur, AL
  • Average high temperature in May: 78.8°F

The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is January (47.5°F).

  • Average low temperature in May: 59.9°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (33.3°F).

Average pressure in May - Decatur, AL
  • Average pressure in May: 30.01"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.98").

Average wind speed in May - Decatur, AL
  • Average wind speed in May: 6.4mph

The windiest month (with the highest average wind speed) is February (8.6mph).
The calmest month (with the lowest average wind speed) is July (4.8mph).

Average humidity in May - Decatur, AL
  • Average humidity in May: 76%

The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (72%).

Average rainfall in May - Decatur, AL
  • Average rainfall in May: 3.5"

The wettest month (with the highest rainfall) is December (4.45").
The driest months (with the least rainfall) are September and November (2.48").

Average rainfall days in May - Decatur, AL
  • Average rainfall days in May: 16.9 days

The month with the highest number of rainy days is July (20 days).
The month with the least rainy days is November (10.4 days).

Average snowfall in May - Decatur, AL
  • Average snowfall in May: 0"

Months with the highest snowfall are January and February (0.55").
Months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in May - Decatur, AL
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (2.5 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in May / Average sunshine in May - Decatur, AL
  • Average daylight in May: 14h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in May: 9.7h

The month with the most sunshine is June (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.6h).

Average sunshine days in May - Decatur, AL
  • Average sunshine days in May: 12.6 days

The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is July (8.8 days).

Average UV index in May - Decatur, AL
  • Average UV index in May: 6

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 2).

Average cloud cover in May - Decatur, AL
  • Average cloud cover in May: 35

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 29).

Average visibility in May - Decatur, AL
  • Average visibility in May: 6mi

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