Average Weather in Derby Kansas, United States
In Derby, the summers are hot, humid, wet, and mostly clear and the winters are very cold, dry, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 25°F to 93°F and is rarely below 11°F or above 102°F.
Based on the tourism score, the best times of year to visit Derby for warm-weather activities are from mid May to mid July and from late July to early October.
The hot season lasts for 3.4 months, from June 3 to September 16, with an average daily high temperature above 83°F. The hottest day of the year is July 21, with an average high of 93°F and low of 72°F.
The cold season lasts for 3.0 months, from November 25 to February 25, with an average daily high temperature below 53°F. The coldest day of the year is January 6, with an average low of 25°F and high of 43°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 Derby, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year in Derby begins around June 8 and lasts for 4.9 months, ending around November 5. On July 9, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 73% of the time, and overcast or mostly cloudy 27% of the time.
The cloudier part of the year begins around November 5 and lasts for 7.1 months, ending around June 8. On February 11, the cloudiest day of the year, the sky is overcast or mostly cloudy 47% of the time, and clear, mostly clear, or partly cloudy 53% 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 Derby varies significantly throughout the year.
The wetter season lasts 5.1 months, from April 9 to September 14, 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 7.
The drier season lasts 6.9 months, from September 14 to April 9. The smallest chance of a wet day is 6% on January 12.
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 throughout the year is rain alone, with a peak probability of 42% on June 7.
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. Derby experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 11 months, from January 24 to January 1, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 3, with an average total accumulation of 4.6 inches.
The rainless period of the year lasts for 3.3 weeks, from January 1 to January 24. The least rain falls around January 12, with an average total accumulation of 0.4 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Derby does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Derby varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 34 minutes of daylight; the longest day is June 21, with 14 hours, 46 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:07 AM on June 13, and the latest sunrise is 1 hour, 49 minutes later at 7:56 AM on November 3. The earliest sunset is at 5:10 PM on December 6, and the latest sunset is 3 hours, 44 minutes later at 8:54 PM on June 28.
Daylight saving time (DST) is observed in Derby 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
Derby experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.2 months, from May 17 to September 24, during which time the comfort level is muggy, oppressive, or miserable at least 15% of the time. The muggiest day of the year is July 22, with muggy conditions 60% of the time.
The least muggy day of the year is December 17, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Derby experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 3.6 months, from February 7 to May 26, with average wind speeds of more than 11.1 miles per hour. The windiest day of the year is April 4, with an average hourly wind speed of 12.9 miles per hour.
The calmer time of year lasts for 8.4 months, from May 26 to February 7. The calmest day of the year is August 6, with an average hourly wind speed of 9.4 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Derby varies throughout the year.
The wind is most often from the south for 8.8 months, from March 10 to December 3, with a peak percentage of 66% on July 5. The wind is most often from the north for 3.2 months, from December 3 to March 10, with a peak percentage of 39% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Derby 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 times of year to visit Derby for general outdoor tourist activities are from mid May to mid July and from late July to early October, with a peak score in the second week of September.
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 Derby for hot-weather activities is from mid June to early September, 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 Derby typically lasts for 7.2 months (219 days), from around March 31 to around November 4, rarely starting before March 11 or after April 19, and rarely ending before October 16 or after November 24.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Derby should appear around March 9, only rarely appearing before February 24 or after March 30.
Growing Degree Days
The average daily incident shortwave solar energy experiences significant seasonal variation over the course of the year.
The brighter period of the year lasts for 4.0 months, from April 24 to August 22, with an average daily incident shortwave energy per square meter above 6.3 kWh. The brightest day of the year is July 8, with an average of 7.2 kWh.
The darker period of the year lasts for 3.1 months, from November 6 to February 8, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest day of the year is December 22, with an average of 2.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Derby are 37.546 deg latitude, -97.269 deg longitude, and 1,270 ft elevation.
The topography within 2 miles of Derby contains only modest variations in elevation, with a maximum elevation change of 115 feet and an average elevation above sea level of 1,271 feet. Within 10 miles also contains only modest variations in elevation (220 feet). Within 50 miles contains only modest variations in elevation (755 feet).
The area within 2 miles of Derby is covered by artificial surfaces (57%), grassland (27%), and cropland (14%), within 10 miles by grassland (45%) and cropland (36%), and within 50 miles by grassland (53%) and cropland (44%).
This report illustrates the typical weather in Derby, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Derby.
For each station, the records are corrected for the elevation difference between that station and Derby 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 Derby is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Derby and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .