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 brings a temperature change, with average high-temperatures moving from April's refreshing 56.8°F (13.8°C) to a comfortable 66.2°F (19°C). Heppner, during the month of May, experiences an average low-temperature of 45.5°F (7.5°C).Humidity
In May, the average relative humidity in Heppner, Oregon, is 57%.Rainfall
In Heppner, during May, the rain falls for 12.3 days and regularly aggregates up to 1.18" (30mm) of precipitation. Throughout the year, there are 131.9 rainfall days, and 13.54" (344mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. May is the last month it regularly snows in Heppner. During 0.2 snowfall days, in May, Heppner aggregates 0.04" (1mm) of snow. In Heppner, during the entire year, snow falls for 31.3 days and aggregates up to 18.54" (471mm) of snow.Daylight
The average length of the day in May is 14h and 55min.On the first day of May in Heppner, sunrise is at 5:45 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 5:13 am and sunset at 8:38 pm PDT.
Sunshine
In Heppner, the average sunshine in May is 10.9h.UV index
In Heppner, Oregon, the average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: The daily maximum UV index of 4 in May interprets into the following advice:
Undertake precautions - It is suggested to shield oneself from sunburn. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Frequently asked questions
What are May temperatures in Heppner?
What is the average humidity in May in Heppner?
How many days does it rain in May in Heppner?
What is the last month it snows in Heppner?
How many hours of daylight does Heppner have in May?
When are sunrise and sunset in May in Heppner?
How many hours of sunshine does Heppner have in May?
What is the UV index reading in May in Heppner?
Average temperature in May
Heppner, OR
- Average high temperature in May: 66.2°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (37.9°F).
- Average low temperature in May: 45.5°F
The month with the highest average low temperature is August (60.8°F).
The coldest month (with the lowest average low temperature) is December (27.1°F).
Average pressure in May
Heppner, OR
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed in May
Heppner, OR
- Average wind speed in May: 8.7mph
The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest month (with the lowest average wind speed) is September (7.2mph).
Average humidity in May
Heppner, OR
- Average humidity in May: 57%
The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are July and August (39%).
Average rainfall in May
Heppner, OR
- Average rainfall in May: 1.18"
The wettest month (with the highest rainfall) is February (1.81").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in May
Heppner, OR
- Average rainfall days in May: 12.3 days
The month with the highest number of rainy days is March (17 days).
The month with the least rainy days is August (4.1 days).
Average snowfall in May
Heppner, OR
- Average snowfall in May: 0.04"
The month with the highest snowfall is February (6.61").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Heppner, OR
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is December (9.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Heppner, OR
- Average daylight in May: 14h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in May: 10h and 5min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and February (Average sunshine: 5h and 18min).
Average sunshine days in May
Heppner, OR
- Average sunshine days in May: 16.3 days
The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is March (9.5 days).
Average UV index in May
Heppner, OR
- Average UV index in May: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Heppner, OR
- Average cloud cover in May: 28
The months with the most cloud cover are January and February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in May
Heppner, OR
- 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).
Heppner, Oregon, USA
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