Grass Valley
California, USA
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Grass Valley, CA

April in Grass Valley, California, is an enjoyable spring month, with average temperature ranging between min 43.3°F (6.3°C) and max 63.1°F (17.3°C).

Temperature

In Grass Valley, the average high-temperature in April slightly increases, from a moderate 56.5°F (13.6°C) in March, to a comfortable 63.1°F (17.3°C). The average low-temperature, in April, is 43.3°F (6.3°C).

Humidity

The average relative humidity is 68%.

Rainfall

In Grass Valley, during April, the rain falls for 10.3 days and regularly aggregates up to 2.28" (58mm) of precipitation. 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, California. In Grass Valley, during April, snow falls for 0.3 days and regularly aggregates up to 0.24" (6mm) of snow. Throughout the year, there are 6.8 snowfall days, and 14.41" (366mm) of snow is accumulated.

Daylight

In April, the average length of the day in Grass Valley, California, is 13.3h.

Sunshine

In Grass Valley, the average sunshine in April is 9.9h.

UV index

The average daily maximum UV index in Grass Valley, California, is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: In April, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in April in Grass Valley?

The average high-temperature, in April, is 63.1°F (17.3°C), while the average low-temperature is 43.3°F (6.3°C).

What is the average humidity in April in Grass Valley?

In April, the average relative humidity is 68%.

How much does it rain in Grass Valley in April?

In April, the rain falls for 10.3 days. Throughout April, 2.28" (58mm) of precipitation is accumulated.

How much does it snow in Grass Valley in April?

In Grass Valley, in April, during 0.3 snowfall days, 0.24" (6mm) of snow is typically accumulated.

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

In April, the average length of the day is 13.3h.

How long on average sun shines in April in Grass Valley?

The average sunshine in April in Grass Valley, California, is 9.9h.

What is the UV index intensity in April in Grass Valley?

In Grass Valley, the average daily maximum UV index in April is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.
Average temperature in April - Grass Valley, CA
  • Average high temperature in April: 17.3°C

The warmest month (with the highest average high temperature) is July (32.3°C).
The month with the lowest average high temperature is December (10.7°C).

  • Average low temperature in April: 6.3°C

The month with the highest average low temperature is July (15.6°C).
The coldest month (with the lowest average low temperature) is December (2.9°C).

Average humidity in April - Grass Valley, CA
  • Average humidity in April: 68%

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

Average rainfall in April - Grass Valley, CA
  • Average rainfall in April: 58mm

The wettest month (with the highest rainfall) is March (167mm).
Driest months (with the lowest rainfall) are July and August (1mm).

Average rainfall days in April - Grass Valley, CA
  • Average rainfall days in April: 10.3 days

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

Average snowfall in April - Grass Valley, CA
  • Average snowfall in April: 6mm

The month with the highest snowfall is February (163mm).
Months with the lowest snowfall are June, July, August, September and October (0mm).

Average snowfall days in April - Grass Valley, CA
  • Average snowfall days in April: 0.3 days

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

Average daylight in April / Average sunshine in April - Grass Valley, CA
  • Average daylight in April: 13.3h

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

  • Average sunshine in April: 9.9h

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

Average UV index in April - Grass Valley, CA
  • Average UV index in April: 4

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