Climate and monthly weather forecastSidney, MT
Climate and monthly weather forecast
The climate of Sidney
Positioned in the mid-latitude steppe, Sidney, Montana, is marked by a BSk Köppen climate classification, exhibiting distinctive climate patterns throughout the year. This weather usually presents profound shifts between warm summers and snowy winters, due to its fairly open geography.Monthly average climatological parameters show a diverse range from high temperatures reaching 84.2°F (29°C) in July and plummeting to 9.9°F (-12.3°C) in January. Whereas rainfall ranges from 0.24" (6mm) in January to around 1.34" (34mm) in July. Associated with the precipitation pattern, the number of rainy days also fluctuates from 3.2 days in January and February to a peak of 11.4 days in June.
The winter period brings snowy conditions in Sidney, with snowfall spiking at 1.77" (45mm) in February and reducing gradually to insignificant levels by May, before kicking off again in October with 0.31" (8mm). The number of snowfall days also sees a peak of 12 days in February, dropping to nonexistence from May to September, and then gradually mounting up towards the end of the year.
Furthermore, Sidney experiences a fair amount of sunshine with daylight hours extending up to 15.9 hours in June and dwindling to 8.5 hours in December. The sunshine duration follows a similar trend, peaking at 11.7 hours in July and dipping to a low of 4.5 hours in December. On the contrary, cloud cover remains more or less consistent throughout the year, staying within the range from 18% in July to 54% in February.
The Best Time to Visit Sidney
Based on the averages, the most advisable period to visit Sidney would be from May to September. During this time, temperatures are warm and inviting, reaching highs of 65.3 to 84.2°F (29°C). These months exhibit a lower amount of rainfall, resulting in fewer rainy days, ranging from 1.22 to 1.34" (34mm) and 8.8 to 11.4 days respectively. Sunshine is abundant, with daylight hours entrancingly stretched up to approximately 15.2 to 15.9 hours and sunshine duration delightfully hitting the 10 to 11.7 hours mark. This period basks in the glow of longer days and reduced precipitation chances, ensuring an enjoyable time for tourists.The Worst Time to Visit Sidney
When planning a visit to Sidney, it would be advisable to avoid the months from November to March. These months fall into the winter season, exhibiting harsh climatic conditions. They are marked by cold temperatures ranging from a high of 23.4 to 39.4°F (4.1°C) and a low from 9.9 to 25.9°F (-3.4°C). These conditions are further compounded by substantial snowfalls, with amounts rising to 1.3 and 1.77" (45mm) in January and February, in addition to a number of snowfall days ranging from 10.6 in January.Contributing factors such as low daylight hours from 8.5 to 10.3 hours and lesser sunshine duration from 4.5 to 5.5 hours make this period less ideal for sightseeing and outdoor activities.
Spring Weather in Sidney
The spring months in Sidney from March to May witness a steady transition from a cold to warm climate. Temperatures during this season rise moderately from 39.7°F (4.3°C) in March to 65.3°F (18.5°C) by the end of May. Rainfall also increases gradually from 0.35" (9mm) in March to 1.22" (31mm) in May, although the number of rainy days, peaks at 10.9 days in May. Snowfall drops off significantly from 1.5" (38mm) in March to just 0.12" (3mm) in May.The length of daylight extends from 11.9 hours in March to 15.2 hours in May, paired with increasing sunshine hours reaching up to 10 hours.
Summer Weather in Sidney
Summers in Sidney, occurring from June to August, are marked by warm and pleasant temperatures. The period sees highs of around 75.7 to 84.2°F (29°C) and minimum temperature levels floating from 56.3 to 63°F (17.2°C) respectively. Rainfall remains moderated within the range of 1.22" (31mm) in June to 0.87" (22mm) by August, and the number of rainy days experiencing a slight reduction from 11.4 to 8.8 days. Noticeably, this period has an absence of snowfall.Autumn Weather in Sidney
Autumn in Sidney is characterized by a dip in temperatures, with highs dropping significantly from 72.3°F (22.4°C) in September to 39.4°F (4.1°C) in November. Correspondingly, low temperatures also fall from 54.3°F (12.4°C) in September to a chilly 25.9°F (-3.4°C) in November. Rainfall declines from 1.06" (27mm) to 0.31" (8mm), with the number of rainy days also decreasing from 7.5 to 4.5 days. Snowfall reintroduces itself during this season with an initial 0.31" (8mm) in October, rising to 1.34" (34mm) in November.Winter Weather in Sidney
Winter takes hold of Sidney from December to February, seeing temperatures staying cold, with February witnessing the coldest conditions. The high temperatures drop from 24.6°F (-4.1°C) in December to 23.4°F (-4.8°C) in January and then rise slightly to 23.9°F (-4.5°C) in February. Similarly, low temperatures plunge from 12.7°F (-10.7°C) to 9.9°F (-12.3°C) during the winter period. Snowfall increases from 1.65" (42mm) to 1.77" (45mm), before dropping to 1.3" (33mm), with an average of 11.6 snowfall days through these months.Weather in January
This is a month where one should brace for a chilly period in Sidney, Montana. Sufficient heating and warm clothing become necessities as the cold weather persists. The mercury readings do not rise beyond 23.4°F (-4.8°C) in January, making it one of the coldest months of the year. Weather in January »Weather in February
February in Sidney ushers in slightly warmer temperatures than in January. Residents anticipate the eventual end of the winter season, indicated by the consistent increase in daylight hours. Interactions and activities in the city modestly increase. Weather in February »Weather in March
In March, Sidney, Montana begins to experience a significant shift in weather. Amid the occasional rainfall, bouts of sunshine transform the city from a winter wonderland to an inviting spring paradise. There is a decrease in snowfall days from 8.7 in March, signaling the end of the winter chills. Weather in March »Weather in April
The weather transition into spring completes in April, with the city experiencing warmer days and longer sunshine hours. Residents commonly engage in outdoor activities. Sidney's landscapes brighten with floral blooms, adding an aesthetic touch to the city. Weather in April »Weather in May
May comes with the comfort of warmer temperatures and dissipating humidity levels in Sidney. The amount of daylight significantly increases, allowing more time outdoors for leisure and recreational activities. Sunny days characterize most of the month, a welcome change to the preceding rainy April. Weather in May »Weather in June
June marks the welcome arrival of summer in Sidney, Montana. The city sees some of its longest daylight hours, making it an ideal month for outdoor activities and events. The atmosphere embraces the summer season with mature plant flowerings. Weather in June »Weather in July
July is the hottest month in Sidney, a peak of the summer, with temperatures soaring up to 84.2°F (29°C). Outdoor activities and events are at their peak with longer daylight hours and less humidity. The city's daily activities heighten, heightened by the prolonged sunshine hours. Weather in July »Weather in August
August carries forward the high temperatures from July, dominating the last full month of summer. Sidney has a continual buzz with late-night gatherings, barbecues, and other summertime traditions. Sunscreen is an absolute necessity with 11.5hours of sunshine during the day. Weather in August »Weather in September
In Sidney, September brings with it a decline in temperatures as the summer makes way for fall. Despite the shorter days, the city still benefits from 10 hours of sunshine on average. Residents begin to witness a scenic transformation as leaves change into autumn colors. Weather in September »Weather in October
By October, the full glory of the fall season is witnessed in Sidney. Colorful trees adorn the city streets, creating a picturesque environment. The drop in temperature continues with the prevalence of crisp, refreshing mornings and evenings. Weather in October »Weather in November
November witnesses further lowering of temperatures as winter draws near. Sidney residents bundle up in warmer clothing and start ignition of their fireplaces. The city has a quieter ambiance, with fewer outdoor activities happening. Weather in November »Weather in December
A resolute return to winter temperatures characterizes December's weather in Sidney, Montana. An array of Christmas lights brighten up the city’s snowy landscape. Residents partake in joyful celebrations amidst the cold weather. Weather in December »Updated: Jun 27, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, marked by an average high-temperature of 23.4°F (-4.8°C) and a low-temperature of 9.9°F (-12.3°C), is the coldest month.
The most humid month is January, with an average relative humidity of 87%.
January is the month with the least rainfall. Rain falls for 3.2 days and accumulates 0.24" (6mm) of precipitation.
In Sidney, during the entire year, the rain falls for 85.7 days and collects up to 8.5" (216mm) of precipitation.
January through May, October through December are months with snowfall.
Throughout the year, there are 56.1 snowfall days, and 8.94" (227mm) of snow is accumulated.
The months with the lowest UV index are January and February, with an average maximum UV index of 1.
The month with the most snowfall is February, when snow falls for 12 days and typically aggregates up to 1.77" (45mm) of snow.
The month with the least sunshine in Sidney is February, with an average of 4.3h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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.
June through September are months without snowfall.
The month with the longest days is June, with an average of 15h and 54min of daylight.
July, recording an average high temperature of 84.2°F (29°C) and a low temperature of 63°F (17.2°C), is Sidney's warmest month.
The month with the most rainfall is July, when the rain falls for 9.7 days and typically aggregates up to 1.34" (34mm) of precipitation.
With an average of 11.7h of sunshine, July has the most sunshine of the year.
With an average maximum UV index of 7, July is the month with the highest UV index in Sidney.
The least humid month is August, with an average relative humidity of 45%.
December has the shortest days of the year, with an average of 8h and 30min of daylight.
Average temperature
Sidney, MT
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (23.4°F).
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).
Average pressure
Sidney, MT
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.16"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.83"Hg
- Average pressure in July:
29.89"Hg - Average pressure in August:
29.89"Hg - Average pressure in September:
29.93"Hg - Average pressure in October:
29.97"Hg - Average pressure in November:
30.05"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed
Sidney, MT
- Average wind speed in January:
10.4mph - Average wind speed in February:
9.2mph - Average wind speed in March:
10.1mph - Average wind speed in April:
11.1mph - Average wind speed in May:
10.4mph - Average wind speed in June:
10.3mph
- Average wind speed in July:
9.6mph - Average wind speed in August:
9.3mph - Average wind speed in September:
10.3mph - Average wind speed in October:
11.1mph - Average wind speed in November:
10.4mph - Average wind speed in December:
10mph
The windiest months (with the highest average wind speed) are April and October (11.1mph).
The calmest month (with the lowest average wind speed) is February (9.2mph).
Average humidity
Sidney, MT
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (45%).
Average rainfall
Sidney, MT
- Average rainfall in January:
0.24" - Average rainfall in February:
0.31" - Average rainfall in March:
0.35" - Average rainfall in April:
0.75" - Average rainfall in May:
1.22" - Average rainfall in June:
1.22"
- Average rainfall in July:
1.34" - Average rainfall in August:
0.87" - Average rainfall in September:
1.06" - Average rainfall in October:
0.51" - Average rainfall in November:
0.31" - Average rainfall in December:
0.31"
The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is January (0.24").
Average rainfall days
Sidney, MT
- Average rainfall days in January:
3.2 days - Average rainfall days in February:
3.2 days - Average rainfall days in March:
6.3 days - Average rainfall days in April:
10.2 days - Average rainfall days in May:
10.9 days - Average rainfall days in June:
11.4 days
- Average rainfall days in July:
9.7 days - Average rainfall days in August:
8.8 days - Average rainfall days in September:
7.5 days - Average rainfall days in October:
6.5 days - Average rainfall days in November:
4.5 days - Average rainfall days in December:
3.5 days
The month with the highest number of rainy days is June (11.4 days).
The months with the least rainy days are January and February (3.2 days).
Average snowfall
Sidney, MT
The month with the highest snowfall is February (1.77").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Sidney, MT
- Average snowfall days in January:
10.6 days - Average snowfall days in February:
12 days - Average snowfall days in March:
8.7 days - Average snowfall days in April:
4 days - Average snowfall days in May:
0.3 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:
2.4 days - Average snowfall days in November:
6.9 days - Average snowfall days in December:
11.2 days
The month with the highest number of snowfall days is February (12 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Sidney, MT
- Average daylight in January:
8h and 54min - Average daylight in February:
10h and 18min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 42min - Average daylight in May:
15h and 12min - Average daylight in June:
15h and 54min
- Average daylight in July:
15h and 30min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 36min - Average daylight in October:
10h and 48min - Average daylight in November:
9h and 18min - Average daylight in December:
8h and 30min
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:
4h and 36min - Average sunshine in February:
4h and 18min - Average sunshine in March:
6h and 12min - Average sunshine in April:
8h and 48min - Average sunshine in May:
10h and 0min - Average sunshine in June:
10h and 48min
- Average sunshine in July:
11h and 42min - Average sunshine in August:
11h and 30min - Average sunshine in September:
10h and 0min - Average sunshine in October:
6h and 12min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days
Sidney, MT
- Average sunshine days in January:
19.3 days - Average sunshine days in February:
16.7 days - Average sunshine days in March:
17.4 days - Average sunshine days in April:
15.8 days - Average sunshine days in May:
16.8 days - Average sunshine days in June:
16 days
- Average sunshine days in July:
17.8 days - Average sunshine days in August:
18.5 days - Average sunshine days in September:
20.7 days - Average sunshine days in October:
20.5 days - Average sunshine days in November:
20.2 days - Average sunshine days in December:
18.7 days
The month with the most sunshine days is September (20.7 days).
The month with the least sunshine days is April (15.8 days).
Average UV index
Sidney, MT
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover
Sidney, MT
The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 18).
Average visibility
Sidney, 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).
