May weather forecast and climate
Grass Valley, CA

Weather in May

The last month of the spring, May, is a pleasant month in Grass Valley, California, with temperature in the range of an average high of 71.2°F (21.8°C) and an average low of 48.4°F (9.1°C).

Temperature

In May, the average high-temperature slightly increases, from an enjoyable 63.1°F (17.3°C) in April, to a pleasant 71.2°F (21.8°C). In Grass Valley, the average low-temperature is 48.4°F (9.1°C).

Humidity

The average relative humidity is 60%.

Rainfall

In Grass Valley, during 6.5 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, in Grass Valley, there are 82 rainfall days, and 33.11" (841mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall in Grass Valley. May is the last month it regularly snows. During 0.1 snowfall days, Grass Valley aggregates 0.08" (2mm) of snow. In Grass Valley, during the entire year, snow falls for 6.8 days, and aggregates up to 14.41" (366mm) of snow.

Daylight

In Grass Valley, the average length of the day in May is 14.4h.

Sunshine

In May, the average sunshine in Grass Valley is 10.8h.

UV index

In May, the average daily maximum UV index in Grass Valley is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for the ordinary person.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in May in Grass Valley?

The average high-temperature, in May, in Grass Valley, is 71.2°F (21.8°C), while the average low-temperature is 48.4°F (9.1°C).

What is the average humidity in May in Grass Valley?

In Grass Valley, the average relative humidity in May is 60%.

How many days does it rain in May in Grass Valley?

In Grass Valley, California, during May, the rain falls for 6.5 days and regularly aggregates up to 1.73" (44mm) of precipitation.

What is the last month it snows in Grass Valley?

May is the last month it regularly snows in Grass Valley. During 0.1 snowfall days, in May, Grass Valley aggregates 0.08" (2mm) of snow.

How many hours of daylight does Grass Valley have in May?

In Grass Valley, California, the average length of the day in May is 14.4h.

How many hours of sunshine does Grass Valley have in May?

In May, the average sunshine in Grass Valley, California, is 10.8h.

What is the UV index reading in May in Grass Valley?

In Grass Valley, California, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in May
Grass Valley, CA

Average temperature in May - Grass Valley, CA
  • Average high temperature in May: 71.2°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (51.3°F).

  • Average low temperature in May: 48.4°F

The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

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Average pressure in May
Grass Valley, CA

Average pressure in May - Grass Valley, CA
  • Average pressure in May: 29.95"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in May
Grass Valley, CA

Average wind speed in May - Grass Valley, CA
  • Average wind speed in May: 5.5mph

The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in May
Grass Valley, CA

Average humidity in May - Grass Valley, CA
  • Average humidity in May: 60%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (37%).

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Average rainfall in May
Grass Valley, CA

Average rainfall in May - Grass Valley, CA
  • Average rainfall in May: 1.73"

The wettest month (with the highest rainfall) is March (6.57").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in May
Grass Valley, CA

Average rainfall days in May - Grass Valley, CA
  • Average rainfall days in May: 6.5 days

The month with the highest number of rainy days is March (15.1 days).
The month with the least rainy days is July (1.1 days).

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Average snowfall in May
Grass Valley, CA

Average snowfall in May - Grass Valley, CA
  • Average snowfall in May: 0.08"

The month with the highest snowfall is February (6.42").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in May
Grass Valley, CA

Average snowfall days in May - Grass Valley, CA
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is March (2.4 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in May /
Average sunshine in May
Grass Valley, CA

Average daylight in May / Average sunshine in May - Grass Valley, CA
  • Average daylight in May: 14.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in May: 10.8h

The month with the most sunshine is July (Average sunshine: 12.2h).
The month with the least sunshine is January (Average sunshine: 5.7h).

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Average sunshine days in May
Grass Valley, CA

Average sunshine days in May - Grass Valley, CA
  • Average sunshine days in May: 23.3 days

The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (14.8 days).

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Average UV index in May
Grass Valley, CA

Average UV index in May - Grass Valley, CA
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 2).

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Average cloud cover in May
Grass Valley, CA

Average cloud cover in May - Grass Valley, CA
  • Average cloud cover in May: 22

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in May
Grass Valley, CA

Average visibility in May - Grass Valley, CA
  • Average visibility in May: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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