May weather forecastSiam, IA
May
Weather in May
The last month of the spring, May, is an agreeable month in Siam, Iowa, with an average temperature ranging between max 70.9°F (21.6°C) and min 54.1°F (12.3°C).Temperature
May brings a rise in Siam's average high-temperature, moving from a comfortable 61.5°F (16.4°C) in April to a pleasant 70.9°F (21.6°C). Siam's nighttime temperature in May drops to an average of 54.1°F (12.3°C).Humidity
In Siam, the average relative humidity in May is 76%.Rainfall
In Siam, in May, during 16.7 rainfall days, 3.15" (80mm) of precipitation is typically accumulated. Throughout the year, in Siam, there are 114.9 rainfall days, and 18.39" (467mm) of precipitation is accumulated.Snowfall
In Siam, snow does not fall in May through September.Daylight
In Siam, the average length of the day in May is 14h and 28min.On the first day of May in Siam, Iowa, sunrise is at 6:17 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 5:50 am and sunset at 8:43 pm CDT.
Sunshine
In May, the average sunshine is 8.7h.UV index
In May, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 5 during May leads to these advisories:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Stay sun-safe with clothing that is both closely woven and worn loosely. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Siam, IA
- Average high temperature in May: 70.9°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (31.1°F).
- Average low temperature in May: 54.1°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).
Average pressure in May
Siam, 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
Siam, IA
- Average wind speed in May: 8.6mph
The windiest month (with the highest average wind speed) is March (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).
Average humidity in May
Siam, IA
- Average humidity in May: 76%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is October (69%).
Average rainfall in May
Siam, IA
- Average rainfall in May: 3.15"
The wettest month (with the highest rainfall) is June (3.39").
The driest month (with the least rainfall) is February (0.43").
Average rainfall days in May
Siam, IA
- Average rainfall days in May: 16.7 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is February (3.4 days).
Average snowfall in May
Siam, IA
- Average snowfall in May: 0"
The month with the highest snowfall is January (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Siam, IA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Siam, IA
- Average daylight in May: 14h and 30min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 8h and 42min
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 36min).
Average sunshine days in May
Siam, IA
- Average sunshine days in May: 12.7 days
The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in May
Siam, 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, November and December (UV index 2).
Average cloud cover in May
Siam, IA
- Average cloud cover in May: 40
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in May
Siam, 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).
