April weather forecast and climate
Roy, MT

April in Roy, Montana, is a frosty spring month, with average temperature ranging between max 47.8°F (8.8°C) and min 31.8°F (-0.1°C).

Temperature

In Roy, the average high-temperature marginally rises, from a cold 40.6°F (4.8°C) in March, to a frosty 47.8°F (8.8°C). In April, the average low-temperature is 31.8°F (-0.1°C).

Humidity

In April, the average relative humidity is 68%.

Rainfall

In Roy, during 14.8 rainfall days, 2.36" (60mm) of precipitation is typically accumulated. Throughout the year, there are 126.2 rainfall days, and 17.83" (453mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall in Roy, Montana. The month with the most snowfall in Roy is April when snow falls for 10 days and typically aggregates up to 9.13" (232mm) of snow.

Daylight

The average length of the day is 13.7h.

Sunshine

The average sunshine is 9h.

UV index

January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Roy. A UV Index reading of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: In April, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. 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 Roy?

In Roy, Montana, in April, the average high-temperature is 47.8°F (8.8°C), and the average low-temperature is 31.8°F (-0.1°C).

What is the average humidity in April in Roy?

In April, the average relative humidity in Roy, Montana, is 68%.

How many days does it rain in April in Roy?

In April, the rain falls for 14.8 days. Throughout April, 2.36" (60mm) of precipitation is accumulated.

How many days does it snow in April in Roy?

In Roy, Montana, in April, snow falls for 10 days, with typically accumulated 9.13" (232mm) of snow.

When does it snow the most in Roy?

April is the month with the most snowfall in Roy. Snow falls for 10 days and accumulates 9.13" (232mm) of snow.

How many hours of daylight does Roy have in April?

The average length of the day in April is 13.7h.

How many hours of sunshine does Roy have in April?

In Roy, Montana, the average sunshine in April is 9h.

What are the months with the lowest UV index in Roy?

Months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2.

How high is the UV index in April in Roy?

In Roy, the average daily maximum UV index in April is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in April - Roy, MT
  • Average high temperature in April: 8.8°C

The warmest month (with the highest average high temperature) is July (26°C).
Months with the lowest average high temperature are February and December (-1.6°C).

  • Average low temperature in April: -0.1°C

The month with the highest average low temperature is August (12.5°C).
The coldest month (with the lowest average low temperature) is February (-9.3°C).

Average pressure in April - Roy, MT
  • Average pressure in April: 1013.6mbar

The month with the highest atmospheric pressure is January (1020.3mbar).
The month with the lowest atmospheric pressure is June (1010.9mbar).

Average wind speed in April - Roy, MT
  • Average wind speed in April: 15.9km/h

The windiest months (with the highest average wind speed) are January, April and October (15.9km/h).
The calmest month (with the lowest average wind speed) is August (11.9km/h).

Average humidity in April - Roy, MT
  • Average humidity in April: 68%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (47%).

Average rainfall in April - Roy, MT
  • Average rainfall in April: 60mm

The wettest month (with the highest rainfall) is May (86mm).
The driest month (with the least rainfall) is December (18mm).

Average rainfall days in April - Roy, MT
  • Average rainfall days in April: 14.8 days

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (5.4 days).

Average snowfall in April - Roy, MT
  • Average snowfall in April: 232mm

The month with the highest snowfall is April (232mm).
Months with the least snowfall are July and August (0mm).

Average snowfall days in April - Roy, MT
  • Average snowfall days in April: 10 days

The month with the highest number of snowfall days is February (15.2 days).
Months with the least snowfall days are July and August (0 days).

Average daylight in April / Average sunshine in April - Roy, MT
  • Average daylight in April: 13.7h

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in April: 9h

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 5.5h).

Average sunshine days in April - Roy, MT
  • Average sunshine days in April: 8.3 days

The month with the most sunshine days is September (19.3 days).
The month with the least sunshine days is April (8.3 days).

Average UV index in April - Roy, MT
  • Average UV index in April: 2

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

Average cloud cover in April - Roy, MT
  • Average cloud cover in April: 42

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 16).

Average visibility in April - Roy, MT
  • Average visibility in April: 9km

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