Ontario, SD Climate


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United States / South Dakota / No Metro Area / Hand County / Ontario / Zip Codes
Ontario, South Dakota has a semi-arid, continental climate with long, cold winters and short, hot summers. Winters in Ontario often have temperatures below freezing for extended periods of time and can also experience occasional snowfall. Summers are usually warm with temperatures reaching the mid 80s Fahrenheit and sometimes even 90s. Precipitation is spread fairly evenly throughout the year but is more common during the summer months when thunderstorms are frequent. Ontario generally experiences very little wind due to its inland location.

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Ontario is 6.8 (10=best), which means it is about average compared to other places in South Dakota.

9.2 Summer - 4.4 Winter
August, June and July are the most pleasant months in Ontario, while January and December are the least comfortable months.

  ClimateOntario, South DakotaUnited States
  21.5 in.38.1 in.
  34.5 in.27.8 in.
  73.4 days106.2 days
  209 days205 days
  85.6°85.8°
  5.6°21.7°
  6.87
  3.64.3
  1722 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Ontario with an average high temperature of 85.6°, which ranks it as about average compared to other places in South Dakota. In Ontario, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Ontario are June, September and August.
In Ontario, there are 22.5 days annually when the high temperature is over 90°, which is about average compared to other places in South Dakota.
January has the coldest nighttime temperatures for Ontario with an average of 5.6°. This is about average compared to other places in South Dakota.
In Ontario, there are 172.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in South Dakota.
In Ontario, there are 29.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in South Dakota.
Humidity in Ontario is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are July, August and June.
June is the wettest month in Ontario with 3.4 inches of rain, and the driest month is January with 0.5 inches. The wettest season is Autumn with 40% of yearly precipitation and 8% occurs in Spring, which is the driest season. The annual rainfall of 21.5 inches in Ontario means that it is drier than most places in South Dakota.
June is the rainiest month in Ontario with 9.4 days of rain, and January is the driest month with only 3.9 rainy days. There are 73.4 rainy days annually in Ontario, which is less rainy than most places in South Dakota. The rainiest season is Autumn when it rains 33% of the time and the driest is Spring with only a 16% chance of a rainy day.
An annual snowfall of 34.5 inches in Ontario means that it is less snowy than most places in South Dakota. February is the snowiest month in Ontario with 7.3 inches of snow, and 7 months of the year have significant snowfall.
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