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
With the onset of May, Jefferson's average high-temperature sees a modest rise, moving from April's moderate 58.5°F (14.7°C) to an enjoyable 65.8°F (18.8°C). Jefferson encounters a significant temperature differential, with an average low-temperature of 42.4°F (5.8°C) during May nights.Humidity
In May, the average relative humidity in Jefferson is 77%.Rainfall
In Jefferson, in May, it is raining for 12.4 days, with typically 1.57" (40mm) of accumulated precipitation. In Jefferson, during the entire year, the rain falls for 164.2 days and collects up to 26.97" (685mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In May, the average length of the day is 14h and 51min.On the first day of the month, sunrise is at 6:00 am and sunset at 8:17 pm. On the last day of May, sunrise is at 5:29 am and sunset at 8:50 pm PDT.
Sunshine
In May, the average sunshine in Jefferson is 8.5h.UV index
In May, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In May, the maximum UV index of 4 suggests this advice:
Undertake precautions - Guarding against sun damage is counselled. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Frequently asked questions
What is the average May temperature in Jefferson?
What is the average humidity in May in Jefferson?
How many days does it rain in May in Jefferson?
When it does not snow in Jefferson?
What is the average length of the day in May in Jefferson?
When is the sunrise / sunset in May in Jefferson?
How many hours of sunshine does Jefferson have in May?
What is the UV index reading in May in Jefferson?
Average temperature in May
Jefferson, OR
- Average high temperature in May: 65.8°F
The warmest month (with the highest average high temperature) is August (81.9°F).
The month with the lowest average high temperature is December (45.5°F).
- Average low temperature in May: 42.4°F
The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is December (34.5°F).
Average pressure in May
Jefferson, OR
- Average pressure in May: 30.04"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in May
Jefferson, OR
- Average wind speed in May: 4.3mph
The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in May
Jefferson, OR
- Average humidity in May: 77%
The months with the highest relative humidity are February and December (87%).
The month with the lowest relative humidity is August (66%).
Average rainfall in May
Jefferson, OR
- Average rainfall in May: 1.57"
The wettest month (with the highest rainfall) is December (3.98").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in May
Jefferson, OR
- Average rainfall days in May: 12.4 days
The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is August (3.9 days).
Average snowfall in May
Jefferson, OR
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.3").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Jefferson, OR
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Jefferson, 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: 8h and 3min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).
Average sunshine days in May
Jefferson, OR
- Average sunshine days in May: 16.3 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is February (9 days).
Average UV index in May
Jefferson, OR
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Jefferson, OR
- Average cloud cover in May: 48
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 21).
Average visibility in May
Jefferson, OR
- Average visibility in May: 5mi
The months with the highest visibility are July, August and September (6mi).
The month with the lowest visibility is February (4mi).
Jefferson, Oregon, USA
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