Alliance, SD Climate


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United States / South Dakota / No Metro Area / Moody County / Alliance / Zip Codes
Alliance, SD has a semi-arid climate with hot summers and very cold winters. The summer months are typically dry with low humidity and temperatures reaching in the high 90s during the day. Winters, on the other hand, are cold and windy with temperatures often dropping below zero and snowfall totaling over 40 inches per year. Precipitation is generally scarce throughout the year but does increase in the spring months of April and May when thunderstorms become more common. Overall, Alliance has a distinctive climate that provides an interesting outdoor environment all year round.

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Alliance is 6.7 (10=best), which means it is less comfortable than most places in South Dakota.

9.2 Summer - 4.1 Winter
August, July and June are the most pleasant months in Alliance, while January and December are the least comfortable months.

  ClimateAlliance, South DakotaUnited States
  27.4 in.38.1 in.
  40.4 in.27.8 in.
  87.2 days106.2 days
  208 days205 days
  82.4°85.8°
  4.1°21.7°
  6.77
  3.64.3
  1563 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 Alliance with an average high temperature of 82.4°, which ranks it as cooler than most places in South Dakota. In Alliance, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Alliance are June, August and July.
In Alliance, there are 8.7 days annually when the high temperature is over 90°, which is cooler than most places in South Dakota.
January has the coldest nighttime temperatures for Alliance with an average of 4.1°. This is colder than most places in South Dakota.
In Alliance, there are 170.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in South Dakota.
In Alliance, there are 31.7 days annually when the nighttime low temperature falls below zero°, which is colder than most places in South Dakota.
The humidity is usually comfortable in Alliance but some summer days can be muggy. July is the most humid month, though it is still relatively mild compared to many other places. The most humid months are July, August and June.
June is the wettest month in Alliance with 4.3 inches of rain, and the driest month is January with 0.6 inches. The wettest season is Autumn with 40% of yearly precipitation and 7% occurs in Spring, which is the driest season. The annual rainfall of 27.4 inches in Alliance means that it is one of the wettest places in South Dakota.
June is the rainiest month in Alliance with 11.2 days of rain, and February is the driest month with only 4.4 rainy days. There are 87.2 rainy days annually in Alliance, which is rainier than most places in South Dakota. The rainiest season is Autumn when it rains 32% of the time and the driest is Spring with only a 16% chance of a rainy day.
An annual snowfall of 40.4 inches in Alliance means that it is snowier than most places in South Dakota. March is the snowiest month in Alliance with 8.0 inches of snow, and 7 months of the year have significant snowfall.
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