May weather forecast
Crater Lake, OR

May brings a significant change in Crater Lake's weather with a substantial reduction in snowfall, reaching as low as 15.9" (404mm). The warmer temperatures of spring firmly take root, melting away the remnants of the winter snow. Days get longer, blessing the place with plenty of sunshine that illuminates the vibrant greenery. Rainfall remains consistent, but the frequency lessens, making way for more bright and sunny days. Crater Lake, in its spring glory, becomes a mesmerizing sight to behold.

Temperature

May's onset witnesses a minor shift in the average high-temperature, moving from an icy 41.7°F (5.4°C) in April to a frosty 49.3°F (9.6°C). Nighttime temperature lowers to an average of 28.4°F (-2°C) in May.

Rainfall

In Crater Lake, in May, it is raining for 11.2 days, with typically 3.58" (91mm) of accumulated precipitation. In Crater Lake, during the entire year, the rain falls for 145.9 days and collects up to 66.22" (1682mm) of precipitation.

Snowfall

January through July, September through December are months with snowfall. In Crater Lake, in May, snow falls for 5.9 days, with typically accumulated 15.91" (404mm) of snow. Throughout the year, there are 101.3 snowfall days, and 482.48" (12255mm) of snow is accumulated.

Daylight

The average length of the day in May is 14h and 40min.
On the first day of May, sunrise is at 6:01 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 5:32 am and sunset at 8:40 pm PDT.

Sunshine

The average sunshine in May is 10h.

UV index

In Crater Lake, the average daily maximum UV index in May is 8. A UV Index value of 8 to 10 symbolizes a very high health hazard from exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 8 in May interprets into the following advice:
Being careless can result in skin and eye damage. Always take the necessary safety measures. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.