May weather forecastDuncan, OK
May
Weather in May
May is a transition month where the last whisper of spring gives way to summer in Duncan. The weather continues to show sunny and warm characteristics, signifying the start of the long days of summer. A high relative humidity often hangs in the air, creating a truly tropical feeling. This month is the rainiest, with the city experiencing downpours totaling as much as 4.37" (111mm). Along with the increased rainfall, May also brings the highest average wind speed recorded, blowing at 11.6mph (18.7km/h) in Duncan, Oklahoma.Temperature
Duncan observes a slight uplift in the average high-temperature with the onset of May, adjusting from April's pleasant 72.3°F (22.4°C) to a moderately hot 79.3°F (26.3°C). The temperature dips to an average of 60.4°F (15.8°C) during May nights.Humidity
May is the most humid month, with an average relative humidity of 73%.Rainfall
May is the month with the most rainfall. Rain falls for 13.5 days and accumulates 4.37" (111mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In Duncan, the average length of the day in May is 13h and 59min.On the first day of the month, sunrise is at 6:40 am and sunset at 8:16 pm. On the last day of May, sunrise is at 6:20 am and sunset at 8:38 pm CDT.
Sunshine
The average sunshine in May is 9.1h.UV index
The average daily maximum UV index in May in Duncan is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.Note: In May, a daily UV index of 6 turns into the following recommendations:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Duncan, OK
- Average high temperature in May: 79.3°F
The warmest month (with the highest average high temperature) is August (95°F).
The months with the lowest average high temperature are January and December (51.3°F).
- Average low temperature in May: 60.4°F
The month with the highest average low temperature is July (73.9°F).
The coldest month (with the lowest average low temperature) is January (33.6°F).
Average pressure in May
Duncan, OK
- Average pressure in May: 29.9"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
Duncan, OK
- Average wind speed in May: 10.4mph
The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest months (with the lowest average wind speed) are July, August and September (8.3mph).
Average humidity in May
Duncan, OK
- Average humidity in May: 73%
The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (55%).
Average rainfall in May
Duncan, OK
- Average rainfall in May: 4.37"
The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days in May
Duncan, OK
- Average rainfall days in May: 13.5 days
The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is January (5 days).
Average snowfall in May
Duncan, OK
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.3").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Duncan, OK
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Duncan, OK
- Average daylight in May: 14h and 0min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in May: 9h and 6min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in May
Duncan, OK
- Average sunshine days in May: 15.7 days
The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is May (15.7 days).
Average UV index in May
Duncan, OK
- Average UV index in May: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in May
Duncan, OK
- Average cloud cover in May: 33
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in May
Duncan, OK
- 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).
