May weather forecast
Oroville, WA

Share

Weather in May

The last month of the spring, May, is a refreshing month in Oroville, Washington, with temperature in the range of an average low of 37.8°F (3.2°C) and an average high of 62.6°F (17°C).

Temperature

The start of May signals an increase in the average high-temperature, moving from a frosty 49.6°F (9.8°C) in April to a comfortable 62.6°F (17°C). A sharp divergence from daytime highs is noted during the month of May, with the average nighttime temperature settling at a cold 37.8°F (3.2°C).

Humidity

The average relative humidity in May is 63%.

Rainfall

May is the month with the most rainfall. Rain falls for 13.8 days and accumulates 1.97" (50mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. May is the last month it regularly snows. During 0.8 snowfall days, in May, Oroville aggregates 0.79" (20mm) of snow. In Oroville, during the entire year, snow falls for 89.6 days and aggregates up to 47.44" (1205mm) of snow.

Daylight

In Oroville, the average length of the day in May is 15h and 19min.
On the first day of May, sunrise is at 5:35 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 4:58 am and sunset at 8:52 pm PDT.

Sunshine

In May, the average sunshine is 10.8h.

UV index

In Oroville, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum daily UV index of 4 during May morphs into the following directions:
Exercise caution. Those with pale skin may experience burns in less than half an hour. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in May?

In Oroville, 62.6°F (17°C) is the average high-temperature and 37.8°F (3.2°C) is the average low-temperature during May.

What is the average humidity in May?

In Oroville, the average relative humidity in May is 63%.

What is the wettest month?

May is the month with the most rainfall. Rain falls for 13.8 days and accumulates 1.97" (50mm) of precipitation.

How much does it rain in May?

In Oroville, Washington, in May, during 13.8 rainfall days, 1.97" (50mm) of precipitation is typically accumulated.

What is the last month it snows?

May is the last month it regularly snows. During 0.8 snowfall days, in May, Oroville aggregates 0.79" (20mm) of snow.

How many hours of daylight does Oroville have in May?

In Oroville, the average day length in May is 15h and 19min.

When is the sunrise / sunset in May?

In May, on the first day of the month, sunrise is at 5:35 am and sunset at 8:14 pm. On the last day of the month, in Oroville, sunrise is at 4:58 am and sunset at 8:52 pm PDT.

How long on average sun shines in May?

The average sunshine duration in May is 10.8h.

What is the UV index intensity in May in Oroville?

In May, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Oroville, WA

Average temperature in May - Oroville, WA
  • Average high temperature in May: 62.6°F

The warmest month (with the highest average high temperature) is August (79.2°F).
The month with the lowest average high temperature is December (27°F).

  • Average low temperature in May: 37.8°F

The month with the highest average low temperature is August (49.5°F).
The coldest month (with the lowest average low temperature) is December (13.1°F).

Average pressure in May
Oroville, WA

Average pressure in May - Oroville, WA
  • Average pressure in May: 29.95"Hg

The month with the highest atmospheric pressure is January (30.18"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).

Average wind speed in May
Oroville, WA

Average wind speed in May - Oroville, WA
  • Average wind speed in May: 4.2mph

The windiest month (with the highest average wind speed) is April (4.5mph).
The calmest months (with the lowest average wind speed) are January, February and December (3.7mph).

Average humidity in May
Oroville, WA

Average humidity in May - Oroville, 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 (49%).

Average rainfall in May
Oroville, WA

Average rainfall in May - Oroville, WA
  • Average rainfall in May: 1.97"

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is August (0.47").

Average rainfall days in May
Oroville, WA

Average rainfall days in May - Oroville, WA
  • Average rainfall days in May: 13.8 days

The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is December (5.7 days).

Average snowfall in May
Oroville, WA

Average snowfall in May - Oroville, WA
  • Average snowfall in May: 0.79"

The month with the highest snowfall is December (9.76").
The months with the least snowfall are June, July and August (0").

Average snowfall days in May
Oroville, WA

Average snowfall days in May - Oroville, WA
  • Average snowfall days in May: 0.8 days

The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in May /
Average sunshine in May
Oroville, WA

Average daylight in May / Average sunshine in May - Oroville, WA
  • Average daylight in May: 15h and 2min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).

  • Average sunshine in May: 10h and 5min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

Average sunshine days in May
Oroville, WA

Average sunshine days in May - Oroville, WA
  • Average sunshine days in May: 15.1 days

The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is March (10.8 days).

Average UV index in May
Oroville, WA

Average UV index in May - Oroville, 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
Oroville, WA

Average cloud cover in May - Oroville, WA
  • Average cloud cover in May: 32

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 14).

Average visibility in May
Oroville, WA

Average visibility in May - Oroville, WA
  • Average visibility in May: 6mi

The months with the highest visibility are April, May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).

Oroville, Washington, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location