March weather forecast and climate
Saint Helena, CA

Weather in March

March, the first month of the spring, in Saint Helena, is a comfortable month, with average temperature varying between 40.5°F (4.7°C) and 61.5°F (16.4°C).

Temperature

In Saint Helena, the average high-temperature is practically the same as in February - a comfortable 61.5°F (16.4°C). In Saint Helena, in March, the average low-temperature is 40.5°F (4.7°C).

Humidity

March is the most humid month in Saint Helena, California, with an average relative humidity of 76%.

Rainfall

In Saint Helena, during March, the rain falls for 13.5 days and regularly aggregates up to 2.64" (67mm) of precipitation. Throughout the year, there are 76.2 rainfall days, and 16.93" (430mm) of precipitation is accumulated.

Snowfall

March is the only month when snow falls. March is the month with the most snowfall in Saint Helena. Snow falls for 0.2 days and accumulates 0.04" (1mm) of snow.

Daylight

The average length of the day in Saint Helena is 12h.

Sunshine

In Saint Helena, the average sunshine is 7h.

UV index

In March, the average daily maximum UV index in Saint Helena is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: In March, 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in March in Saint Helena?

The average high-temperature, in March, in Saint Helena, is 61.5°F (16.4°C), while the average low-temperature is 40.5°F (4.7°C).

What is the most humid month in Saint Helena?

March is the most humid month, with an average relative humidity of 76%.

What is the average humidity in March in Saint Helena?

In Saint Helena, the average relative humidity in March is 76%.

How much does it rain in Saint Helena in March?

In Saint Helena, California, during March, the rain falls for 13.5 days and regularly aggregates up to 2.64" (67mm) of precipitation.

When does it start to snow in Saint Helena?

March is the first month it typically snows in Saint Helena, California. Throughout March, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow.

What is the snowiest month in Saint Helena?

The month with the most snowfall is March when snow falls for 0.2 days and typically aggregates up to 0.04" (1mm) of snow.

How many hours of daylight does Saint Helena have in March?

In Saint Helena, the average length of the day in March is 12h.

How long on average sun shines in March in Saint Helena?

In Saint Helena, California, the average sunshine in March is 7h.

How high is the UV index in March in Saint Helena?

In March, the average daily maximum UV index in Saint Helena, California, is 4. 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 March
Saint Helena, CA

Average temperature in March - Saint Helena, CA
  • Average high temperature in March: 61.5°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (54.5°F).

  • Average low temperature in March: 40.5°F

The month with the highest average low temperature is September (54.3°F).
The coldest month (with the lowest average low temperature) is December (39.6°F).

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Average pressure in March
Saint Helena, CA

Average pressure in March - Saint Helena, CA
  • Average pressure in March: 30.07"

The month with the highest atmospheric pressure is January (30.14").
Months with the lowest atmospheric pressure are June, August and September (29.91").

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Average wind speed in March
Saint Helena, CA

Average wind speed in March - Saint Helena, CA
  • Average wind speed in March: 5.3mph

The windiest month (with the highest average wind speed) is May (5.8mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).

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Average humidity in March
Saint Helena, CA

Average humidity in March - Saint Helena, CA
  • Average humidity in March: 76%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (53%).

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Average rainfall in March
Saint Helena, CA

Average rainfall in March - Saint Helena, CA
  • Average rainfall in March: 2.64"

The wettest month (with the highest rainfall) is February (3.7").
The driest month (with the least rainfall) is July (0").

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Average rainfall days in March
Saint Helena, CA

Average rainfall days in March - Saint Helena, CA
  • Average rainfall days in March: 13.5 days

The month with the highest number of rainy days is March (13.5 days).
The month with the least rainy days is August (0.3 days).

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Average snowfall in March
Saint Helena, CA

Average snowfall in March - Saint Helena, CA
  • Average snowfall in March: 0.04"

The month with the highest snowfall is March (0.04").
Months with the least snowfall are January, February, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in March
Saint Helena, CA

Average snowfall days in March - Saint Helena, CA
  • Average snowfall days in March: 0.2 days

The month with the highest number of snowfall days is March (0.2 days).
Months with the least snowfall days are January, February, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in March /
Average sunshine in March
Saint Helena, CA

Average daylight in March / Average sunshine in March - Saint Helena, CA
  • Average daylight in March: 12h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in March: 7h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 5.3h).

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Average sunshine days in March
Saint Helena, CA

Average sunshine days in March - Saint Helena, CA
  • Average sunshine days in March: 15.9 days

The month with the most sunshine days is July (30 days).
The month with the least sunshine days is March (15.9 days).

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Average UV index in March
Saint Helena, CA

Average UV index in March - Saint Helena, CA
  • Average UV index in March: 4

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in March
Saint Helena, CA

Average cloud cover in March - Saint Helena, CA
  • Average cloud cover in March: 44

The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in March
Saint Helena, CA

Average visibility in March - Saint Helena, CA
  • Average visibility in March: 5mi

Months with the highest visibility are February, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January and March (5mi).

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