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
Williams sees a rise in temperature during May, with average high-temperatures transitioning from a refreshing 56.5°F (13.6°C) in April to a pleasant 68.4°F (20.2°C). During May, Williams's temperature falls to a steady low-temperature average of 51.6°F (10.9°C).Humidity
The average relative humidity in May is 75%.Rainfall
In May, the rain falls for 16.7 days. Throughout May, 3.98" (101mm) of precipitation is accumulated. In Williams, Iowa, during the entire year, the rain falls for 132 days and collects up to 27.01" (686mm) of precipitation.Snowfall
Months with snowfall in Williams, Iowa, are January through May, October through December. May is the last month it regularly snows. During 0.2 snowfall days, in May, Williams aggregates 0.39" (10mm) of snow. Throughout the year, there are 44.4 snowfall days, and 16.65" (423mm) of snow is accumulated.Daylight
The average length of the day in May is 14h and 38min.On the first day of the month, sunrise is at 6:07 am and sunset at 8:14 pm. On the last day of May, sunrise is at 5:39 am and sunset at 8:44 pm CDT.
Sunshine
The average sunshine in May in Williams is 8.3h.UV index
In May, the average daily maximum UV index in Williams is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: An average maximum UV index of 5 in May leads to these recommendations:
Guard yourself - Avoiding sunburn is suggested. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
What is the usual temperature for Williams in May?
What is the average humidity in May in Williams?
How much does it rain in Williams in May?
What is the last month it snows in Williams?
What is the average length of the day in May in Williams?
What time are sunrise and sunset in May in Williams?
How long on average sun shines in May in Williams?
What is the UV index reading in May in Williams?
Average temperature in May
Williams, IA
- Average high temperature in May: 68.4°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in May: 51.6°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (11.8°F).
Average pressure in May
Williams, IA
- Average pressure in May: 29.93"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
Williams, IA
- Average wind speed in May: 9.5mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7.3mph).
Average humidity in May
Williams, IA
- Average humidity in May: 75%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (70%).
Average rainfall in May
Williams, IA
- Average rainfall in May: 3.98"
The wettest month (with the highest rainfall) is June (4.06").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days in May
Williams, IA
- Average rainfall days in May: 16.7 days
The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (3.4 days).
Average snowfall in May
Williams, IA
- Average snowfall in May: 0.39"
The month with the highest snowfall is January (4.17").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Williams, IA
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Williams, IA
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in May: 8h and 2min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in May
Williams, IA
- Average sunshine days in May: 12.7 days
The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in May
Williams, IA
- Average UV index in May: 5
The month with the highest UV index is June (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
Williams, IA
- Average cloud cover in May: 44
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in May
Williams, IA
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Williams, Iowa, USA
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