May weather forecast and climate
Alton, AL

May, the last month of the spring, in Alton, is a warm month, with average temperature varying between 60.4°F (15.8°C) and 80.6°F (27°C).

Temperature

In Alton, the average high-temperature marginally rises, from an agreeable 72.9°F (22.7°C) in April, to a moderately hot 80.6°F (27°C). The average low-temperature, in May, is 60.4°F (15.8°C).

Heat index

The average heat index is appraised at 84.6°F (29.2°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. 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. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, differences in body mass, height, and shape, pregnancy), and activity. 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 particularly important for children. 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.

Humidity

The average relative humidity in May is 74%.

Rainfall

In Alton, it is raining for 13.2 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, in Alton, there are 149 rainfall days, and 19.88" (505mm) of precipitation is accumulated.

Snowfall

In Alton snow does not fall in April through October.

Daylight

In Alton, the average length of the day in May is 13.9h.

Sunshine

In Alton, the average sunshine is 10h.

UV index

Months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to the Sun's UV rays for the average person.
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. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in May in Alton?

The average high-temperature, in May, in Alton, Alabama, is 80.6°F (27°C), while the average low-temperature is 60.4°F (15.8°C). In May, the average heat index (a.k.a. 'feels like', 'real feel'), that factores the actual air temperature with the relative humidity, is calculated to 84.6°F (29.2°C).

What is the average humidity in May in Alton?

In Alton, the average relative humidity in May is 74%.

How many days does it rain in May in Alton?

In Alton, Alabama, in May, during 13.2 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.

When it does not snow in Alton?

April through October are months without snowfall in Alton, Alabama.

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

The average length of the day in May is 13.9h.

How long on average sun shines in May in Alton?

In May, the average sunshine in Alton, Alabama, is 10h.

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

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

What is the UV index intensity in May in Alton?

The average daily maximum UV index in May in Alton is 6. A UV Index value of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV radiation.
Average temperature in May - Alton, AL
  • Average high temperature in May: 80.6°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (50.7°F).

  • Average low temperature in May: 60.4°F

The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (34.9°F).

Average pressure in May - Alton, 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 - Alton, AL
  • Average wind speed in May: 5.7mph

The windiest months (with the highest average wind speed) are January and February (7.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.3mph).

Average humidity in May - Alton, AL
  • Average humidity in May: 74%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (72%).

Average rainfall in May - Alton, AL
  • Average rainfall in May: 1.54"

The wettest month (with the highest rainfall) is August (2.24").
The driest month (with the least rainfall) is October (1.06").

Average rainfall days in May - Alton, AL
  • Average rainfall days in May: 13.2 days

The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is November (7.9 days).

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

The month with the highest snowfall is January (0.2").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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

The month with the highest number of snowfall days is February (1 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in May / Average sunshine in May - Alton, AL
  • Average daylight in May: 13.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in May: 10h

Months with the most sunshine are June and July (Average sunshine: 10.6h).
Months with the least sunshine are February and December (Average sunshine: 4.8).

Average sunshine days in May - Alton, AL
  • Average sunshine days in May: 15.4 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is July (9.6 days).

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

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

Average cloud cover in May - Alton, AL
  • Average cloud cover in May: 33

The month with the most cloud cover is February (Cloud cover 48).
Months with the least cloud cover are June and September (Cloud cover 30).

Average visibility in May - Alton, 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).