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
The start of May signals a slight increase in the average high-temperature, moving from a mild 56.3°F (13.5°C) in April to a comfortable 64.9°F (18.3°C). Lewiston's average low-temperature for the month of May denotes a significant decline from the daily high, recording at a cold 39.9°F (4.4°C).Humidity
In Lewiston, the average relative humidity in May is 71%.Rainfall
In Lewiston, California, in May, during 11.5 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. Throughout the year, in Lewiston, there are 119.2 rainfall days, and 33.35" (847mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Lewiston.Daylight
In Lewiston, the average length of the day in May is 14h and 28min.On the first day of the month, sunrise is at 6:08 am and sunset at 8:07 pm. On the last day of May, sunrise is at 5:42 am and sunset at 8:35 pm PDT.
Sunshine
In Lewiston, the average sunshine in May is 10.1h.UV index
In May, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In May, the maximum UV index of 4 suggests this advice:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Boost your sun resistance with garments that are densely woven yet spacious. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
What is the average May temperature in Lewiston?
What is the average humidity in May in Lewiston?
How much does it rain in Lewiston in May?
When it does not snow in Lewiston?
Does it snow in Lewiston in May?
How many hours of daylight does Lewiston have in May?
What time are sunrise and sunset in May in Lewiston?
How many hours of sunshine does Lewiston have in May?
What is the UV index reading in May in Lewiston?
Average temperature in May
Lewiston, CA
- Average high temperature in May: 64.9°F
The warmest months (with the highest average high temperature) are July and August (84.6°F).
The month with the lowest average high temperature is December (45°F).
- Average low temperature in May: 39.9°F
The month with the highest average low temperature is July (51.3°F).
The coldest month (with the lowest average low temperature) is December (30°F).
Average pressure in May
Lewiston, CA
- Average pressure in May: 29.99"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).
Average wind speed in May
Lewiston, CA
- Average wind speed in May: 4.3mph
The windiest months (with the highest average wind speed) are March and April (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity in May
Lewiston, CA
- Average humidity in May: 71%
The month with the highest relative humidity is March (82%).
The month with the lowest relative humidity is August (54%).
Average rainfall in May
Lewiston, CA
- Average rainfall in May: 2.2"
The wettest month (with the highest rainfall) is December (6.14").
The driest months (with the least rainfall) are July and August (0.16").
Average rainfall days in May
Lewiston, CA
- Average rainfall days in May: 11.5 days
The month with the highest number of rainy days is March (18.3 days).
The month with the least rainy days is August (2.5 days).
Average snowfall in May
Lewiston, CA
- Average snowfall in May: 0"
The month with the highest snowfall is February (8.35").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Lewiston, CA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Lewiston, CA
- Average daylight in May: 14h and 3min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 10h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in May
Lewiston, CA
- Average sunshine days in May: 17.3 days
The month with the most sunshine days is August (26.8 days).
The month with the least sunshine days is March (10.6 days).
Average UV index in May
Lewiston, CA
- 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
Lewiston, CA
- Average cloud cover in May: 34
The month with the most cloud cover is March (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in May
Lewiston, CA
- Average visibility in May: 5mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are March and December (4mi).
Lewiston, California, USA
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