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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, like December, is another subzero cold winter month in Roslyn, South Dakota, with an average temperature fluctuating between 5°F (-15°C) and 18.9°F (-7.3°C). In Roslyn, the lowest average temperatures are observed in January, with a high of 18.9°F (-7.3°C) and a low of 5°F (-15°C). Weather in January »
Weather in February
February, the last month of the winter in Roslyn, is also a subzero cold month, with an average temperature varying between 21.4°F (-5.9°C) and 7.2°F (-13.8°C). Roslyn experiences a transition to a still subzero cold 21.4°F (-5.9°C) in average high-temperatures with the arrival of February, not greatly differing from January's 18.9°F (-7.3°C). Weather in February »
Weather in March
March, the first month of the spring in Roslyn, is a wintry month, with temperature in the range of an average low of 23.2°F (-4.9°C) and an average high of 37.6°F (3.1°C). March's arrival brings a noticeable temperature shift, escalating from a freezing cold 21.4°F (-5.9°C) in February to a cold 37.6°F (3.1°C). Weather in March »
Weather in April
April in Roslyn, South Dakota, is a fresh spring month, with an average temperature ranging between min 35.1°F (1.7°C) and max 51.1°F (10.6°C). Roslyn in April shows a temperature shift, moving from an average high of a cold 37.6°F (3.1°C) in March to a cool 51.1°F (10.6°C). Weather in April »
Weather in May
The last month of the spring, May, is a refreshing month in Roslyn, South Dakota, with an average temperature ranging between max 64°F (17.8°C) and min 46.6°F (8.1°C). The start of May signals an increase in the average high-temperature, moving from a fresh 51.1°F (10.6°C) in April to an enjoyable 64°F (17.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Roslyn, South Dakota, with an average temperature fluctuating between 56.3°F (13.5°C) and 74.3°F (23.5°C). The onset of June brings a temperature shift, with the average high-temperature moving from an enjoyable 64°F (17.8°C) in May to a moderately hot 74.3°F (23.5°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Roslyn, South Dakota, with temperature in the range of an average low of 61.3°F (16.3°C) and an average high of 81°F (27.2°C). The average temperatures reach their apex in July, averaging 81°F (27.2°C) at the high end and 61.3°F (16.3°C) at the low end. For July, the heat index is calculated to be 84.2°F (29°C). Weather in July »
Weather in August
August, the last month of the summer in Roslyn, is also a moderately hot month, with an average temperature ranging between min 58.8°F (14.9°C) and max 80.1°F (26.7°C). August registers an average high-temperature of a still moderately hot 80.1°F (26.7°C), slightly varied from July's 81°F (27.2°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a pleasant month in Roslyn, South Dakota, with an average temperature fluctuating between 51.3°F (10.7°C) and 71.6°F (22°C). Roslyn records a mild change in average high-temperature during September, easing from a warm 80.1°F (26.7°C) in August to a pleasant 71.6°F (22°C). Weather in September »
Weather in October
October, the same as September, is another fresh autumn month in Roslyn, South Dakota, with an average temperature varying between 38.7°F (3.7°C) and 53.8°F (12.1°C). As October sets, the average high-temperature displays a significant decrease, moving down from a pleasant 71.6°F (22°C) in September to a cool 53.8°F (12.1°C). Weather in October »
Weather in November
The last month of the autumn, November, is also an icy month in Roslyn, South Dakota, with temperature in the range of an average high of 38.8°F (3.8°C) and an average low of 25.7°F (-3.5°C). In November, the average high-temperature decreases considerably from a fresh 53.8°F (12.1°C) in October to a cold 38.8°F (3.8°C). Weather in November »
Weather in December
The first month of the winter, December, is also a subzero cold month in Roslyn, South Dakota, with an average temperature ranging between min 11.5°F (-11.4°C) and max 23.2°F (-4.9°C). December's arrival signals a significant decrease in average high-temperatures, falling from November's cold 38.8°F (3.8°C) to a freezing cold 23.2°F (-4.9°C). Weather in December »
Updated: Jul 5, 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
What are the coldest months?
January is the coldest month, with an average high-temperature of 18.9°F (-7.3°C) and an average low-temperature of 5°F (-15°C).
What is the most humid month?
With an average relative humidity of 91%, January is the most humid month.
How much does it rain?
In Roslyn, during the entire year, the rain falls for 112.9 days and collects up to 22.09" (561mm) of precipitation.
When does it snow?
January through May, October through December are months with snowfall.
How much does it snow?
Throughout the year, there are 68.4 snowfall days, and 23.74" (603mm) of snow is accumulated.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 3.2h of sunshine.
When is the lowest UV index?
The months with the lowest UV index are January, November and December, with an average maximum UV index of 1.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
When it does not snow?
In Roslyn, snow does not fall in June through September.
When are the longest days?
June has the longest days of the year in Roslyn, with an average of 15h and 36min of daylight.
What are the months with the highest UV index?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What are the warmest months?
July, having an average high-temperature of 81°F (27.2°C) and an average low-temperature of 61.3°F (16.3°C), is the warmest month.
What is the wettest month?
The month with the most rainfall is July, when the rain falls for 14.4 days and typically aggregates up to 3.58" (91mm) of precipitation.
What month has the most sunshine?
July has the most sunshine of the year, with an average of 10.7h of sunshine.
What is the least humid month?
With an average relative humidity of 66%, September is the least humid month.
What is the driest month?
The month with the least rainfall is November, when the rain falls for 4.6 days and typically collects 0.63" (16mm) of precipitation.
What is the snowiest month?
December is the month with the most snowfall. Snow falls for 14.6 days and accumulates 4.53" (115mm) of snow.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 8h and 48min of daylight.
Average temperature
Roslyn, SD
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (18.9°F).
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (5°F).
Average pressure
Roslyn, SD
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.17"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.85"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed
Roslyn, SD
- Average wind speed in January:
11mph - Average wind speed in February:
10.6mph - Average wind speed in March:
11mph - Average wind speed in April:
11.7mph - Average wind speed in May:
10.5mph - Average wind speed in June:
9.6mph
- Average wind speed in July:
8.7mph - Average wind speed in August:
8.8mph - Average wind speed in September:
10.3mph - Average wind speed in October:
11.3mph - Average wind speed in November:
11mph - Average wind speed in December:
11mph
The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is July (8.7mph).
Average humidity
Roslyn, SD
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is September (66%).
Average rainfall
Roslyn, SD
- Average rainfall in January:
0.71" - Average rainfall in February:
0.71" - Average rainfall in March:
1.26" - Average rainfall in April:
1.93" - Average rainfall in May:
2.72" - Average rainfall in June:
3.46"
- Average rainfall in July:
3.58" - Average rainfall in August:
2.01" - Average rainfall in September:
1.57" - Average rainfall in October:
2.52" - Average rainfall in November:
0.63" - Average rainfall in December:
0.98"
The wettest month (with the highest rainfall) is July (3.58").
The driest month (with the least rainfall) is November (0.63").
Average rainfall days
Roslyn, SD
- Average rainfall days in January:
2.5 days - Average rainfall days in February:
2.3 days - Average rainfall days in March:
8.1 days - Average rainfall days in April:
11.3 days - Average rainfall days in May:
16.5 days - Average rainfall days in June:
17.9 days
- Average rainfall days in July:
14.4 days - Average rainfall days in August:
12.3 days - Average rainfall days in September:
10.1 days - Average rainfall days in October:
8.8 days - Average rainfall days in November:
4.6 days - Average rainfall days in December:
4.1 days
The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (2.3 days).
Average snowfall
Roslyn, SD
- Average snowfall in January:
4.45" - Average snowfall in February:
4.29" - Average snowfall in March:
3.19" - Average snowfall in April:
2.64" - Average snowfall in May:
0.12" - Average snowfall in June:
0"
The month with the highest snowfall is December (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Roslyn, SD
- Average snowfall days in January:
15.1 days - Average snowfall days in February:
12.5 days - Average snowfall days in March:
10.4 days - Average snowfall days in April:
5.8 days - Average snowfall days in May:
0.8 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
2.6 days - Average snowfall days in November:
6.6 days - Average snowfall days in December:
14.6 days
The month with the highest number of snowfall days is January (15.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Roslyn, SD
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 4min - Average daylight in May:
14h and 5min - Average daylight in June:
15h and 4min
- Average daylight in July:
15h and 2min - 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 3min - Average daylight in December:
8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January:
3h and 1min - Average sunshine in February:
4h and 0min - Average sunshine in March:
5h and 1min - Average sunshine in April:
7h and 2min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 2min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 0min - Average sunshine in December:
3h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days
Roslyn, SD
- Average sunshine days in January:
14.3 days - Average sunshine days in February:
14.9 days - Average sunshine days in March:
14.8 days - Average sunshine days in April:
13 days - Average sunshine days in May:
12.3 days - Average sunshine days in June:
10.4 days
- Average sunshine days in July:
13.7 days - Average sunshine days in August:
16.5 days - Average sunshine days in September:
18.5 days - Average sunshine days in October:
17.6 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
15.2 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is June (10.4 days).
Average UV index
Roslyn, SD
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover
Roslyn, SD
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility
Roslyn, SD
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Roslyn, South Dakota, USA
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