April weather forecast and climate
Sweet Grass, MT

April is a frosty spring month in Sweet Grass, Montana, with average temperature fluctuating between 34°F (1.1°C) and 49.6°F (9.8°C).

Temperature

In April, the average high-temperature increases, from a cold 39°F (3.9°C) in March, to a chilly 49.6°F (9.8°C). In April, in Sweet Grass, the average low-temperature is 34°F (1.1°C).

Humidity

In April, the average relative humidity in Sweet Grass, Montana, is 62%.

Rainfall

In April, in Sweet Grass, the rain falls for 8.3 days. Throughout April, 0.94" (24mm) of precipitation is accumulated. In Sweet Grass, during the entire year, the rain falls for 70.4 days and collects up to 8.46" (215mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. In Sweet Grass, in April, snow falls for 5 days, with typically accumulated 2.44" (62mm) of snow. In Sweet Grass, during the entire year, snow falls for 54.3 days, and aggregates up to 19.49" (495mm) of snow.

Daylight

In April, the average length of the day in Sweet Grass is 13.8h.

Sunshine

The average sunshine is 9.3h.

UV index

In Sweet Grass, the average daily maximum UV index in April is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for the average person.
Note: In April, the average maximum UV index of 3 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. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in April in Sweet Grass?

In April, in Sweet Grass, Montana, the average high-temperature is 49.6°F (9.8°C), and the average low-temperature is 34°F (1.1°C).

What is the average humidity in April in Sweet Grass?

In April, the average relative humidity is 62%.

How many days does it rain in April in Sweet Grass?

In April, in Sweet Grass, the rain falls for 8.3 days. Throughout April, 0.94" (24mm) of precipitation is accumulated.

How many days does it snow in April in Sweet Grass?

In Sweet Grass, Montana, during April, snow falls for 5 days and regularly aggregates up to 2.44" (62mm) of snow.

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

In Sweet Grass, the average length of the day in April is 13.8h.

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

In Sweet Grass, the average sunshine in April is 9.3h.

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

In Sweet Grass, Montana, the average daily maximum UV index in April is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV radiation.
Average temperature in April - Sweet Grass, MT
  • Average high temperature in April: 9.8°C

The warmest month (with the highest average high temperature) is July (26°C).
The month with the lowest average high temperature is December (-2.7°C).

  • Average low temperature in April: 1.1°C

The month with the highest average low temperature is August (12.9°C).
The coldest month (with the lowest average low temperature) is December (-9.3°C).

Average pressure in April - Sweet Grass, MT
  • Average pressure in April: 1014.1mbar

The month with the highest atmospheric pressure is January (1020.3mbar).
The month with the lowest atmospheric pressure is June (1011.5mbar).

Average wind speed in April - Sweet Grass, MT
  • Average wind speed in April: 18km/h

The windiest month (with the highest average wind speed) is January (19km/h).
The calmest month (with the lowest average wind speed) is August (14.1km/h).

Average humidity in April - Sweet Grass, MT
  • Average humidity in April: 62%

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (43%).

Average rainfall in April - Sweet Grass, MT
  • Average rainfall in April: 24mm

The wettest month (with the highest rainfall) is June (45mm).
The driest month (with the least rainfall) is July (8mm).

Average rainfall days in April - Sweet Grass, MT
  • Average rainfall days in April: 8.3 days

The month with the highest number of rainy days is May (10.4 days).
The month with the least rainy days is November (2.6 days).

Average snowfall in April - Sweet Grass, MT
  • Average snowfall in April: 62mm

The month with the highest snowfall is February (91mm).
Months with the least snowfall are June, July and August (0mm).

Average snowfall days in April - Sweet Grass, MT
  • Average snowfall days in April: 5 days

The month with the highest number of snowfall days is December (10.2 days).
Months with the least snowfall days are July and August (0 days).

Average daylight in April / Average sunshine in April - Sweet Grass, MT
  • Average daylight in April: 13.8h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.3h).

  • Average sunshine in April: 9.3h

The month with the most sunshine is July (Average sunshine: 12h).
Months with the least sunshine are January and December (Average sunshine: 5.6).

Average sunshine days in April - Sweet Grass, MT
  • Average sunshine days in April: 17.4 days

The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is April (17.4 days).

Average UV index in April - Sweet Grass, MT
  • Average UV index in April: 3

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, March, October, November and December (UV index 2).

Average cloud cover in April - Sweet Grass, MT
  • Average cloud cover in April: 37

The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 15).

Average visibility in April - Sweet Grass, MT
  • Average visibility in April: 9km

Months with the highest visibility are May, June, July, August, September and October (10km).
Months with the lowest visibility are January, February, March, April, November and December (9km).