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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, in Roy, Montana, is another subzero cold winter month, with an average temperature fluctuating between 16.9°F (-8.4°C) and 30.6°F (-0.8°C). With the transition into January, Roy notes an average high-temperature of a still freezing cold 30.6°F (-0.8°C), closely resembling December. Weather in January »
Weather in February
February, the last month of the winter in Roy, is another freezing cold month, with temperature in the range of an average high of 29.1°F (-1.6°C) and an average low of 15.3°F (-9.3°C). February and December are identified as the coldest months, with an average high-temperature of 29.1°F (-1.6°C). Weather in February »
Weather in March
The first month of the spring, March, is a cold month in Roy, Montana, with an average temperature ranging between max 40.6°F (4.8°C) and min 25.3°F (-3.7°C). Observing a rise in March, the average high-temperature goes from February's subzero cold 29.1°F (-1.6°C) to a cold 40.6°F (4.8°C). Weather in March »
Weather in April
April is a frosty spring month in Roy, Montana, with an average temperature ranging between max 47.8°F (8.8°C) and min 31.8°F (-0.1°C). Entering April, Roy notices a subtle temperature elevation, with the average high-temperature advancing from March's cold 40.6°F (4.8°C) to a chilly 47.8°F (8.8°C). Weather in April »
Weather in May
May, the last month of the spring in Roy, is a mild month, with an average temperature ranging between max 58.5°F (14.7°C) and min 40.1°F (4.5°C). May's arrival coincides with a rise in the average high-temperature, moving from April's frosty 47.8°F (8.8°C) to a refreshing 58.5°F (14.7°C). Weather in May »
Weather in June
The first month of the summer, June, is an agreeable month in Roy, Montana, with temperature in the range of an average low of 47.8°F (8.8°C) and an average high of 68.5°F (20.3°C). The arrival of June sees a shift in the average high-temperature, moving from a moderate 58.5°F (14.7°C) in May to a pleasant 68.5°F (20.3°C). Weather in June »
Weather in July
July in Roy, Montana, is a moderately hot summer month, with an average temperature varying between 78.8°F (26°C) and 54.3°F (12.4°C). Roy's temperature records reveal July as the warmest month, marked by average highs of 78.8°F (26°C) and lows of 54.3°F (12.4°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Roy, Montana, with an average temperature fluctuating between 54.5°F (12.5°C) and 78.1°F (25.6°C). August's advent notes a subtle adjustment in average high-temperature to a still warm 78.1°F (25.6°C) from July. Weather in August »
Weather in September
The first month of the autumn, September, is still a refreshing month in Roy, Montana, with an average temperature fluctuating between 67.5°F (19.7°C) and 47.1°F (8.4°C). With the onset of September, Roy's average high-temperature adjusts, receding from August's warm 78.1°F (25.6°C) to an enjoyable 67.5°F (19.7°C). Weather in September »
Weather in October
October, like September, in Roy, Montana, is another fresh autumn month, with an average temperature ranging between min 35.1°F (1.7°C) and max 52.2°F (11.2°C). October signals a clear temperature drop, with average high-temperatures decreasing from September's enjoyable 67.5°F (19.7°C) to a fresh 52.2°F (11.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is another cold month in Roy, Montana, with an average temperature fluctuating between 39.2°F (4°C) and 25.2°F (-3.8°C). In November, the meteorological conditions alter, with the average high-temperature shifting from a cool 52.2°F (11.2°C) in October to an icy 39.2°F (4°C). Weather in November »
Weather in December
December, the first month of the winter in Roy, is still a freezing cold month, with temperature in the range of an average low of 16°F (-8.9°C) and an average high of 29.1°F (-1.6°C). In Roy, Montana, the coldest months are February and December, registering an average high-temperature of 29.1°F (-1.6°C). Weather in December »
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How much does it rain in Roy?
In Roy, Montana, during the entire year, the rain falls for 126.2 days and collects up to 17.83" (453mm) of precipitation.
When does it snow in Roy?
Months with snowfall in Roy are January through June, September through December.
How many days does it snow in Roy?
Throughout the year, there are 83.4 snowfall days, and 45.51" (1156mm) of snow is accumulated.
What is the month with the lowest UV index in Roy?
The months with the lowest UV index in Roy are January through April, October through December, with an average maximum UV index of 2.
What month is the coldest in Roy?
February and December are identified as the coldest months in Roy, with an average high-temperature of 29.1°F (-1.6°C).
What is the most humid month in Roy?
February is the most humid month in Roy, with an average relative humidity of 79%.
What is the month with the least sunshine in Roy?
With an average of 5.5h of sunshine, February has the least sunshine of the year.
When is Daylight Saving Time (DST) in Roy?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Roy, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.
When does it snow the most in Roy?
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.
What is the rainiest month in Roy?
May is the month with the most rainfall in Roy. Rain falls for 19.3 days and accumulates 3.39" (86mm) of precipitation.
When are the longest days in Roy?
The month with the longest days is June, with an average of 15h and 54min of daylight.
What is the hottest time of year in Roy?
July, characterized by an average high temperature of 78.8°F (26°C) and a low temperature of 54.3°F (12.4°C), is generally the warmest month in Roy.
When it does not snow in Roy?
In Roy, Montana, snow does not fall in July and August.
What month has the most sunshine in Roy?
With an average of 11.8h of sunshine, July has the most sunshine of the year.
What is the month with the highest UV index in Roy?
With an average maximum UV index of 6, July is the month with the highest UV index.
What is the least humid month in Roy?
August is the least humid month, with an average relative humidity of 47%.
What is the driest month in Roy?
December is the month with the least rainfall in Roy. Rain falls for 6 days and accumulates 0.71" (18mm) of precipitation.
What is the month with the shortest days in Roy?
December has the shortest days of the year in Roy, with an average of 8h and 30min of daylight.
Average temperature
Roy, MT
The warmest month (with the highest average high temperature) is July (78.8°F).
The months with the lowest average high temperature are February and December (29.1°F).
The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).
Average pressure
Roy, MT
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.85"Hg
- Average pressure in July:
29.9"Hg - Average pressure in August:
29.9"Hg - Average pressure in September:
29.94"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.05"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed
Roy, MT
- Average wind speed in January:
9.9mph - Average wind speed in February:
9.1mph - Average wind speed in March:
9.2mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.8mph - Average wind speed in June:
8.5mph
- Average wind speed in July:
7.6mph - Average wind speed in August:
7.4mph - Average wind speed in September:
8.5mph - Average wind speed in October:
9.9mph - Average wind speed in November:
9.7mph - Average wind speed in December:
9.5mph
The windiest months (with the highest average wind speed) are January, April and October (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).
Average humidity
Roy, MT
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (47%).
Average rainfall
Roy, MT
- Average rainfall in January:
0.83" - Average rainfall in February:
0.98" - Average rainfall in March:
1.14" - Average rainfall in April:
2.36" - Average rainfall in May:
3.39" - Average rainfall in June:
2.83"
- Average rainfall in July:
1.06" - Average rainfall in August:
1.34" - Average rainfall in September:
1.02" - Average rainfall in October:
1.22" - Average rainfall in November:
0.94" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days
Roy, MT
- Average rainfall days in January:
5.4 days - Average rainfall days in February:
6.9 days - Average rainfall days in March:
10.4 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
19.3 days - Average rainfall days in June:
17 days
- Average rainfall days in July:
11.2 days - Average rainfall days in August:
10.5 days - Average rainfall days in September:
8.7 days - Average rainfall days in October:
9.5 days - Average rainfall days in November:
6.5 days - Average rainfall days in December:
6 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
Roy, MT
- Average snowfall in January:
5.47" - Average snowfall in February:
6.65" - Average snowfall in March:
5.63" - Average snowfall in April:
9.13" - Average snowfall in May:
2.48" - Average snowfall in June:
0.04"
The month with the highest snowfall is April (9.13").
The months with the least snowfall are July and August (0").
Average snowfall days
Roy, MT
- Average snowfall days in January:
12.9 days - Average snowfall days in February:
15.2 days - Average snowfall days in March:
12.7 days - Average snowfall days in April:
10 days - Average snowfall days in May:
2.4 days - Average snowfall days in June:
0.2 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
1 days - Average snowfall days in October:
6.1 days - Average snowfall days in November:
9.4 days - Average snowfall days in December:
13.5 days
The month with the highest number of snowfall days is February (15.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight / Average sunshine
Roy, MT
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 2min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 4min - Average daylight in May:
15h and 1min - Average daylight in June:
15h and 5min
- Average daylight in July:
15h and 3min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 2min - Average daylight in December:
8h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January:
5h and 4min - Average sunshine in February:
5h and 3min - Average sunshine in March:
7h and 4min - Average sunshine in April:
9h and 0min - Average sunshine in May:
10h and 0min - Average sunshine in June:
11h and 1min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
11h and 2min - Average sunshine in September:
10h and 0min - Average sunshine in October:
6h and 3min - Average sunshine in November:
6h and 1min - Average sunshine in December:
5h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days
Roy, MT
- Average sunshine days in January:
15.9 days - Average sunshine days in February:
11.8 days - Average sunshine days in March:
10.5 days - Average sunshine days in April:
8.3 days - Average sunshine days in May:
8.9 days - Average sunshine days in June:
9.9 days
- Average sunshine days in July:
16.6 days - Average sunshine days in August:
17.2 days - Average sunshine days in September:
19.3 days - Average sunshine days in October:
15.3 days - Average sunshine days in November:
16.8 days - Average sunshine days in December:
16 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
Roy, MT
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover
Roy, MT
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
Roy, MT
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Roy, Montana, USA
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