Average Weather in Sleepy Eye Minnesota, United States
In Sleepy Eye, the summers are long and warm; the winters are freezing, snowy, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 9°F to 83°F and is rarely below -12°F or above 92°F.
Based on the tourism score, the best time of year to visit Sleepy Eye for warm-weather activities is from mid June to early September.
The warm season lasts for 4.1 months, from May 17 to September 20, with an average daily high temperature above 71°F. The hottest day of the year is July 18, with an average high of 83°F and low of 64°F.
The cold season lasts for 3.3 months, from November 26 to March 4, with an average daily high temperature below 36°F. The coldest day of the year is January 15, with an average low of 9°F and high of 24°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
In Sleepy Eye, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Sleepy Eye begins around June 9 and lasts for 4.2 months, ending around October 17. On July 28, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 74% of the time, and overcast or mostly cloudy 26% of the time.
The cloudier part of the year begins around October 17 and lasts for 7.8 months, ending around June 9. On February 6, the cloudiest day of the year, the sky is overcast or mostly cloudy 58% of the time, and clear, mostly clear, or partly cloudy 42% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Sleepy Eye varies significantly throughout the year.
The wetter season lasts 5.6 months, from April 10 to September 28, with a greater than 24% chance of a given day being a wet day. The chance of a wet day peaks at 42% on June 9.
The drier season lasts 6.4 months, from September 28 to April 10. The smallest chance of a wet day is 7% on February 2.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in Sleepy Eye changes throughout the year.
Rain alone is the most common for 8.7 months, from March 4 to November 25. The highest chance of a day with rain alone is 42% on June 9.
Snow alone is the most common for 3.3 months, from November 25 to March 4. The highest chance of a day with snow alone is 6% on December 12.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Sleepy Eye experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.9 months, from March 2 to November 29, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 17, with an average total accumulation of 4.0 inches.
The rainless period of the year lasts for 3.2 months, from November 29 to March 2. The least rain falls around January 25, with an average total accumulation of 0.1 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Sleepy Eye experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.2 months, from October 30 to April 6, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 15, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 6.8 months, from April 6 to October 30. The least snow falls around July 20, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Sleepy Eye varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 51 minutes of daylight; the longest day is June 21, with 15 hours, 32 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:34 AM on June 15, and the latest sunrise is 2 hours, 24 minutes later at 7:58 AM on November 3. The earliest sunset is at 4:39 PM on December 10, and the latest sunset is 4 hours, 27 minutes later at 9:07 PM on June 26.
Daylight saving time (DST) is observed in Sleepy Eye during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
Sleepy Eye experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.2 months, from June 9 to September 15, during which time the comfort level is muggy, oppressive, or miserable at least 10% of the time. The muggiest day of the year is July 21, with muggy conditions 41% of the time.
The least muggy day of the year is February 8, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Sleepy Eye experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 8.2 months, from September 22 to May 30, with average wind speeds of more than 10.8 miles per hour. The windiest day of the year is April 9, with an average hourly wind speed of 13.0 miles per hour.
The calmer time of year lasts for 3.8 months, from May 30 to September 22. The calmest day of the year is August 2, with an average hourly wind speed of 8.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Sleepy Eye varies throughout the year.
The wind is most often from the north for 3.5 months, from January 22 to May 5, with a peak percentage of 36% on March 8. The wind is most often from the south for 6.5 months, from May 5 to November 20, with a peak percentage of 44% on September 3. The wind is most often from the west for 2.1 months, from November 20 to January 22, with a peak percentage of 35% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Sleepy Eye throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Sleepy Eye for general outdoor tourist activities is from mid June to early September, with a peak score in the first week of August.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Sleepy Eye for hot-weather activities is from early July to early August, with a peak score in the third week of July.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
The growing season in Sleepy Eye typically lasts for 5.4 months (162 days), from around April 24 to around October 3, rarely starting before April 5 or after May 14, and rarely ending before September 15 or after October 22.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Sleepy Eye should appear around April 22, only rarely appearing before April 9 or after May 7.
Growing Degree Days
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.5 months, from May 5 to August 21, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is July 8, with an average of 7.1 kWh.
The darker period of the year lasts for 3.4 months, from October 30 to February 11, with an average daily incident shortwave energy per square meter below 2.6 kWh. The darkest day of the year is December 18, with an average of 1.5 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Sleepy Eye are 44.297 deg latitude, -94.724 deg longitude, and 1,010 ft elevation.
The topography within 2 miles of Sleepy Eye is essentially flat, with a maximum elevation change of 69 feet and an average elevation above sea level of 1,012 feet. Within 10 miles is essentially flat (295 feet). Within 50 miles contains only modest variations in elevation (902 feet).
The area within 2 miles of Sleepy Eye is covered by cropland (90%), within 10 miles by cropland (94%), and within 50 miles by cropland (95%).
This report illustrates the typical weather in Sleepy Eye, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Sleepy Eye.
For each station, the records are corrected for the elevation difference between that station and Sleepy Eye according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Sleepy Eye is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sleepy Eye and a given station.
The stations contributing to this reconstruction are: New Ulm Municipal Airport (55%, 18 kilometers, east); St. James, St. James Municipal Airport (18%, 37 kilometers, south); Redwood Falls Municipal Airport (17%, 40 kilometers, northwest); and Windom Municipal Airport (10%, 53 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .