May weather forecastKeller, WA
May
Weather in May
May, the last month of the spring in Keller, is an enjoyable month, with an average temperature fluctuating between 39.4°F (4.1°C) and 65.1°F (18.4°C).Temperature
The onset of May marks an increase in the average high-temperature, moving from a fresh 53.2°F (11.8°C) in April to a comfortable 65.1°F (18.4°C). Despite a significant daily temperature range, Keller's temperature falls to a steady low-temperature average of 39.4°F (4.1°C) in May.Humidity
In Keller, the average relative humidity in May is 63%.Rainfall
May is the month with the most rainfall. Rain falls for 11.3 days and accumulates 1.06" (27mm) of precipitation.Snowfall
May through August and October are months without snowfall.Daylight
In Keller, the average length of the day in May is 15h and 13min.On the first day of the month, sunrise is at 5:34 am and sunset at 8:08 pm. On the last day of May, sunrise is at 4:59 am and sunset at 8:46 pm PDT.
Sunshine
In May, the average sunshine is 10.6h.UV index
In Keller, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index, 4 during May, leads to the following recommendations:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Keller, WA
- Average high temperature in May: 65.1°F
The warmest month (with the highest average high temperature) is August (82.8°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in May: 39.4°F
The month with the highest average low temperature is August (52.3°F).
The coldest months (with the lowest average low temperature) are February and December (18.3°F).
Average pressure in May
Keller, WA
- Average pressure in May: 29.94"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in May
Keller, WA
- Average wind speed in May: 4.3mph
The windiest month (with the highest average wind speed) is April (4.6mph).
The calmest months (with the lowest average wind speed) are January and December (3.4mph).
Average humidity in May
Keller, WA
- Average humidity in May: 63%
The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (47%).
Average rainfall in May
Keller, WA
- Average rainfall in May: 1.06"
The wettest month (with the highest rainfall) is May (1.06").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in May
Keller, WA
- Average rainfall days in May: 11.3 days
The month with the highest number of rainy days is May (11.3 days).
The months with the least rainy days are February and September (5 days).
Average snowfall in May
Keller, WA
- Average snowfall in May: 0"
The month with the highest snowfall is January (1.42").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in May
Keller, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is December (7.5 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Keller, WA
- Average daylight in May: 15h and 12min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in May: 10h and 36min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in May
Keller, WA
- Average sunshine days in May: 17.8 days
The month with the most sunshine days is September (23.8 days).
The month with the least sunshine days is June (17.3 days).
Average UV index in May
Keller, WA
- 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 1).
Average cloud cover in May
Keller, WA
- Average cloud cover in May: 32
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in May
Keller, WA
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (2mi).
