Duncan
Oklahoma, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Duncan, OK

The last month of the spring, May, is another warm month in Duncan, Oklahoma, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 59°F (15°C).

Temperature

In Duncan, the average high-temperature marginally rises, from 75.9°F (24.4°C) in April, to a still moderately hot 82°F (27.8°C). In Duncan, the average low-temperature is 59°F (15°C).

Heat index

The average heat index is appraised at a tropical 86°F (30°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 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels.

Humidity

In Duncan, Oklahoma, the average relative humidity is 68%.

Rainfall

May is the month with the most rainfall in Duncan. Rain falls for 7.6 days and accumulates 6.4" (162.6mm) of precipitation.

Snowfall

In May, in Duncan, it doesn't snow. April is the latest month when it typically snows. Throughout the year, 7" (177.8mm) of snow is accumulated.

Daylight

In Duncan, the average length of the day in May is 14h.

What is the temperature in May in Duncan?

In May, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 59°F (15°C).

What is the average humidity in May in Duncan?

In Duncan, the average relative humidity in May is 68%.

How much does it rain in Duncan in May?

In Duncan, Oklahoma, during May, the rain falls for 7.6 days and regularly aggregates up to 6.4" (162.6mm) of precipitation.

What is the wettest month in Duncan?

May is the month with the most rainfall in Duncan. Rain falls for 7.6 days and accumulates 6.4" (162.6mm) of precipitation.

Does it snow in Duncan in May?

In May, in Duncan, it doesn't snow. April is the latest month when it typically snows.

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

The average length of the day in May is 14h.
Average temperature in May - Duncan, OK
  • Average high temperature in May: 82°F

The warmest month (with the highest average high temperature) is August (96°F).
The month with the lowest average high temperature is January (52°F).

  • Average low temperature in May: 59°F

Months with the highest average low temperature are July and August (71°F).
The coldest month (with the lowest average low temperature) is January (29°F).

Average humidity in May - Duncan, OK
  • Average humidity in May: 68%

The month with the highest relative humidity is January (70%).
Months with the lowest relative humidity are August and September (58%).

Average rainfall in May - Duncan, OK
  • Average rainfall in May: 6.4"

The wettest month (with the highest rainfall) is May (6.4").
The driest month (with the lowest rainfall) is January (1.4").

Average rainfall days in May - Duncan, OK
  • Average rainfall days in May: 7.6 days

The month with the highest number of rainy days is May (7.6 days).
The month with the lowest number of rainy days is November (2.9 days).

Average snowfall in May - Duncan, OK
  • Average snowfall in May: 0"

The month with the highest snowfall is February (2.2").
Months with the lowest snowfall are May, June, July, August, September, October and November (0").

Average daylight in May - Duncan, OK
  • Average daylight in May: 14h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).