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
Sisters sees an increase in the average high-temperature with the arrival of May, moving from April's frosty 49.8°F (9.9°C) to a mild 60.1°F (15.6°C). In May, Sisters encounters an average low-temperature of 39.2°F (4°C) during the night.Humidity
In May, the average relative humidity is 66%.Rainfall
In Sisters, during May, the rain falls for 15 days and regularly aggregates up to 2.01" (51mm) of precipitation. Throughout the year, there are 142.1 rainfall days, and 22.87" (581mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. May is the last month it regularly snows. During 2.4 snowfall days, in May, Sisters aggregates 0.63" (16mm) of snow. In Sisters, during the entire year, snow falls for 70.7 days and aggregates up to 60.04" (1525mm) of snow.Daylight
In May, the average length of the day in Sisters is 14h and 49min.On the first day of the month, sunrise is at 5:55 am and sunset at 8:10 pm. On the last day of May, sunrise is at 5:25 am and sunset at 8:42 pm PDT.
Sunshine
In Sisters, the average sunshine in May is 10.6h.UV index
In May, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: In May, a daily UV index of 4 turns into the following recommendations:
Guard yourself - Avoiding sunburn is suggested. It's recommended to limit sun exposure when its radiation is at its peak during midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Frequently asked questions
What are May temperatures in Sisters?
What is the average humidity in May in Sisters?
How much does it rain in Sisters in May?
What is the last month it snows in Sisters?
What is the average length of the day in May in Sisters?
When are sunrise and sunset in May in Sisters?
How many hours of sunshine does Sisters have in May?
How high is the UV index in May in Sisters?
Average temperature in May
Sisters, OR
- Average high temperature in May: 60.1°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (36.5°F).
- Average low temperature in May: 39.2°F
The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is December (24.8°F).
Average pressure in May
Sisters, OR
- Average pressure in May: 30"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.98"Hg).
Average wind speed in May
Sisters, OR
- Average wind speed in May: 5.5mph
The windiest month (with the highest average wind speed) is February (6.1mph).
The calmest months (with the lowest average wind speed) are August and September (4.8mph).
Average humidity in May
Sisters, OR
- Average humidity in May: 66%
The month with the highest relative humidity is December (84%).
The months with the lowest relative humidity are July and August (53%).
Average rainfall in May
Sisters, OR
- Average rainfall in May: 2.01"
The wettest month (with the highest rainfall) is January (3.31").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in May
Sisters, OR
- Average rainfall days in May: 15 days
The month with the highest number of rainy days is March (16.9 days).
The month with the least rainy days is July (5 days).
Average snowfall in May
Sisters, OR
- Average snowfall in May: 0.63"
The month with the highest snowfall is February (13.74").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Sisters, OR
- Average snowfall days in May: 2.4 days
The month with the highest number of snowfall days is December (14.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Sisters, OR
- Average daylight in May: 14h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in May: 10h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in May
Sisters, OR
- Average sunshine days in May: 11.9 days
The month with the most sunshine days is July (23.3 days).
The month with the least sunshine days is March (8.1 days).
Average UV index in May
Sisters, OR
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in May
Sisters, OR
- Average cloud cover in May: 33
The months with the most cloud cover are January, February, March and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in May
Sisters, OR
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Sisters, Oregon, USA
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