Average Weather at Watertown Municipal Airport South Dakota, United States
At Watertown Municipal Airport, the summers are 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 5°F to 83°F and is rarely below -15°F or above 92°F.
Based on the tourism score, the best time of year to visit Watertown Municipal Airport for warm-weather activities is from late June to late August.
The warm season lasts for 3.7 months, from May 26 to September 17, with an average daily high temperature above 71°F. The hottest day of the year is July 19, with an average high of 83°F and low of 62°F.
The cold season lasts for 3.4 months, from November 25 to March 6, with an average daily high temperature below 34°F. The coldest day of the year is January 15, with an average low of 5°F and high of 23°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
Jiayuguan, China (6,512 miles away); Shitanjing, China (6,449 miles); and Xiaoshi, China (5,963 miles) are the far-away foreign places with temperatures most similar to Watertown Municipal Airport (view comparison).
At Watertown Municipal Airport, 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 at Watertown Municipal Airport begins around June 10 and lasts for 4.1 months, ending around October 12. On July 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 76% of the time, and overcast or mostly cloudy 24% of the time.
The cloudier part of the year begins around October 12 and lasts for 7.9 months, ending around June 10. On February 5, 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
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Watertown Municipal Airport varies significantly throughout the year.
The wetter season lasts 5.0 months, from April 23 to September 23, with a greater than 22% chance of a given day being a wet day. The chance of a wet day peaks at 41% on June 11.
The drier season lasts 7.0 months, from September 23 to April 23. The smallest chance of a wet day is 4% on January 29.
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 at Watertown Municipal Airport changes throughout the year.
Rain alone is the most common for 8.0 months, from March 14 to November 13. The highest chance of a day with rain alone is 41% on June 11.
Snow alone is the most common for 4.0 months, from November 13 to March 14. The highest chance of a day with snow alone is 6% on March 1.
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. Watertown Municipal Airport experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 7.9 months, from March 15 to November 11, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 16, with an average total accumulation of 3.4 inches.
The rainless period of the year lasts for 4.1 months, from November 11 to March 15. The least rain falls around January 27, with an average total accumulation of 0.0 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. Watertown Municipal Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 6.2 months, from October 29 to May 5, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around March 3, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 5.8 months, from May 5 to October 29. The least snow falls around July 21, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day at Watertown Municipal Airport varies significantly over the course of the year. In 2019, the shortest day is December 21, with 8 hours, 47 minutes of daylight; the longest day is June 21, with 15 hours, 36 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:41 AM on June 15, and the latest sunrise is 2 hours, 26 minutes later at 8:08 AM on November 2. The earliest sunset is at 4:47 PM on December 10, and the latest sunset is 4 hours, 32 minutes later at 9:19 PM on June 26.
Daylight saving time (DST) is observed at Watertown Municipal Airport during 2019, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.
Sunrise & Sunset with Twilight and Daylight Saving Time
Watertown Municipal Airport experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.0 months, from June 11 to September 12, during which time the comfort level is muggy, oppressive, or miserable at least 6% of the time. The muggiest day of the year is July 25, with muggy conditions 26% of the time.
The least muggy day of the year is February 27, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed at Watertown Municipal Airport experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 8.6 months, from September 14 to June 2, with average wind speeds of more than 11.4 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 13.4 miles per hour.
The calmer time of year lasts for 3.4 months, from June 2 to September 14. The calmest day of the year is July 31, with an average hourly wind speed of 9.4 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Watertown Municipal Airport varies throughout the year.
The wind is most often from the north for 3.1 months, from February 1 to May 5, with a peak percentage of 36% on April 12. The wind is most often from the south for 6.2 months, from May 5 to November 11, with a peak percentage of 44% on August 26. The wind is most often from the west for 2.7 months, from November 11 to February 1, with a peak percentage of 36% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is at Watertown Municipal Airport 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 Watertown Municipal Airport for general outdoor tourist activities is from late June to late August, with a peak score in the last week of July.
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 Watertown Municipal Airport 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 at Watertown Municipal Airport typically lasts for 4.9 months (149 days), from around May 4 to around September 30, rarely starting before April 16 or after May 22, and rarely ending before September 13 or after October 18.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms at Watertown Municipal Airport should appear around April 27, only rarely appearing before April 16 or after May 13.
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 4 to August 21, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest day of the year is July 7, with an average of 7.2 kWh.
The darker period of the year lasts for 3.4 months, from October 29 to February 12, with an average daily incident shortwave energy per square meter below 2.7 kWh. The darkest day of the year is December 20, with an average of 1.5 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Watertown Municipal Airport are 44.914 deg latitude, -97.155 deg longitude, and 1,729 ft elevation.
The topography within 2 miles of Watertown Municipal Airport contains only modest variations in elevation, with a maximum elevation change of 98 feet and an average elevation above sea level of 1,736 feet. Within 10 miles also contains only modest variations in elevation (328 feet). Within 50 miles contains only modest variations in elevation (1,184 feet).
The area within 2 miles of Watertown Municipal Airport is covered by cropland (59%), grassland (18%), and artificial surfaces (15%), within 10 miles by cropland (72%) and grassland (19%), and within 50 miles by cropland (76%) and grassland (18%).
This report illustrates the typical weather at Watertown Municipal Airport, 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
Watertown Municipal Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
The stations on which we may fall back include but are not limited to Brookings Municipal Airport; Sisseton Municipal Airport; Ortonville, Ortonville Muncipal-Martinson Field Airport; Madison Municipal Airport; Myers Field Airport; Wheaton Municipal Airport; Madison-Lac Qui Parle County Airport; and Appleton Municipal Airport.
Time zones for aiports and weather stations are provided by AskGeo.com .