Helena
Montana, USA
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Helena, MT

The State Capital building of Montana in Helena city, set on a beautiful natural park
The State Capital building of Montana in Helena city, set on a beautiful natural park
April is a moderate spring month in Helena, Montana, with average temperature varying between 57.7°F (14.3°C) and 32.2°F (0.1°C).

Temperature

In Helena, the average high-temperature increases, from a chilly 48.2°F (9°C) in March, to a mild 57.7°F (14.3°C). In Helena, the average low-temperature is 32.2°F (0.1°C).

Humidity

In April, the average relative humidity is 53.9%.

Rainfall

In Helena, in April, during 8.7 rainfall days, 1" (24.9mm) of precipitation is typically accumulated. Throughout the year, in Helena, Montana, there are 91.6 rainfall days, and 11.2" (284.9mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Helena, Montana, are January through May, August through December. In Helena, snow falls for 2.9 days, with typically accumulated 3.7" (94mm) of snow. In Helena, Montana, during the entire year, snow falls for 32.8 days, and aggregates up to 38.1" (967.8mm) of snow.

Daylight

In April, the average length of the day is 13.6h.

Sunshine

The average sunshine in April is 8.1h.

UV index

In Helena, the average daily maximum UV index in April is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.

What is the temperature in April in Helena?

In Helena, in April, the average high-temperature is 57.7°F (14.3°C), and the average low-temperature is 32.2°F (0.1°C).

What is the average humidity in April in Helena?

In April, the average relative humidity is 53.9%.

How much does it rain in Helena in April?

In Helena, Montana, in April, during 8.7 rainfall days, 1" (24.9mm) of precipitation is typically accumulated.

How many days does it snow in April in Helena?

In Helena, in April, during 2.9 snowfall days, 3.7" (94mm) of snow is typically accumulated.

How many hours of daylight does Helena have in April?

In Helena, the average length of the day in April is 13.6h.

How long on average sun shines in April in Helena?

In Helena, the average sunshine in April is 8.1h.

How high is the UV index in April in Helena?

In April, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.
Average temperature in April - Helena, MT
  • Average high temperature in April: 57.8°F

The warmest month (with the highest average high temperature) is July (85.7°F).
The month with the lowest average high temperature is December (31.7°F).

  • Average low temperature in April: 32.1°F

The month with the highest average low temperature is July (54.3°F).
The coldest month (with the lowest average low temperature) is December (11.9°F).

Average humidity in April - Helena, MT
  • Average humidity in April: 53.9%

The month with the highest relative humidity is December (68.1%).
The month with the lowest relative humidity is July (46.4%).

Average rainfall in April - Helena, MT
  • Average rainfall in April: 1"

The wettest month (with the highest rainfall) is June (2.1").
The driest month (with the lowest rainfall) is February (0.3").

Average rainfall days in April - Helena, MT
  • Average rainfall days in April: 8.7 days

The month with the highest number of rainy days is June (11.2 days).
The month with the lowest number of rainy days is February (5.9 days).

Average snowfall in April - Helena, MT
  • Average snowfall in April: 3.7"

The month with the highest snowfall is December (7.3").
Months with the lowest snowfall are June and July (0").

Average snowfall days in April - Helena, MT
  • Average snowfall days in April: 2.9 days

The month with the highest number of snowfall days is December (6 days).
The month with the lowest number of snowfall days is July (0 days).

Average daylight in April / Average sunshine in April - Helena, MT
  • Average daylight in April: 13.6h

The month with the longest days is June (Average daylight: 15.8h).
The month with shortest days is December (Average daylight: 8.6h).

  • Average sunshine in April: 8.1h

The month with most sunshine is July (Average sunshine: 11.9h).
The month with least sunshine is December (Average sunshine: 3.2h).

Average UV index in April - Helena, MT
  • Average UV index in April: 5

The month with the highest UV index is July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 1).