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 snowfall in May
- Average snowfall 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
May comes with an increase, with the average high-temperature moving from a moderate 59.5°F (15.3°C) in April to a pleasant 69.6°F (20.9°C). Lewis observes an average low-temperature of 52.9°F (11.6°C) during May nights.Humidity
The average relative humidity in May in Lewis is 75%.Rainfall
In Lewis, during May, the rain falls for 16.2 days and regularly aggregates up to 3.15" (80mm) of precipitation. In Lewis, during the entire year, the rain falls for 118.7 days and collects up to 20.79" (528mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows in Lewis. During 0.3 snowfall days, in May, Lewis aggregates 0.24" (6mm) of snow. In Lewis, during the entire year, snow falls for 32.3 days and aggregates up to 9.41" (239mm) of snow.Daylight
The average length of the day in May is 14h and 31min.On the first day of May, sunrise is at 6:16 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 8:46 pm CDT.
Sunshine
In Lewis, the average sunshine in May is 8.7h.UV index
In Lewis, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index, 5 during May, leads to the following recommendations:
Take necessary precautions - Defending against sun damage is advocated. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
What is the temperature in May in Lewis?
What is the average humidity in May in Lewis?
How many days does it rain in May in Lewis?
What is the last month it snows in Lewis?
What is the average length of the day in May in Lewis?
When are sunrise and sunset in May in Lewis?
How long on average sun shines in May in Lewis?
How high is the UV index in May in Lewis?
Average temperature in May
Lewis, IA
- Average high temperature in May: 69.6°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in May: 52.9°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in May
Lewis, IA
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in May
Lewis, IA
- Average wind speed in May: 9.1mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).
Average humidity in May
Lewis, IA
- Average humidity in May: 75%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (69%).
Average rainfall in May
Lewis, IA
- Average rainfall in May: 3.15"
The wettest month (with the highest rainfall) is June (3.7").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in May
Lewis, IA
- Average rainfall days in May: 16.2 days
The month with the highest number of rainy days is June (16.4 days).
The month with the least rainy days is February (3.1 days).
Average snowfall in May
Lewis, IA
- Average snowfall in May: 0.24"
The month with the highest snowfall is February (2.36").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Lewis, IA
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Lewis, IA
- Average daylight in May: 14h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in May
Lewis, IA
- Average sunshine days in May: 11.8 days
The month with the most sunshine days is December (21.2 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in May
Lewis, IA
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in May
Lewis, IA
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in May
Lewis, IA
- 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).
Lewis, Iowa, USA
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