Derby, KS climate
Derby has chilly winters and hot summers. A typical July afternoon reaches 92°, a January night drops to 23°, and about 11 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Derby feels like
Winter
Spring
Summer
Fall
Derby weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 44° | 23° | 0.8" | 3.0" | 4 | 3 | 29° – 44° |
| February | 49° | 26° | 1.3" | 2.3" | 5 | 3 | 31° – 46° |
| March | 59° | 36° | 2.4" | 1.7" | 6 | 1 | 40° – 58° |
| April | 69° | 44° | 3.3" | 0 | 7 | 0 | 50° – 63° |
| May | 78° | 55° | 5.5" | 0 | 10 | 0 | 60° – 74° |
| June | 87° | 65° | 5.1" | 0 | 8 | 0 | 71° – 81° |
| July | 92° | 70° | 4.1" | 0 | 7 | 0 | 76° – 88° |
| August | 91° | 68° | 4.1" | 0 | 7 | 0 | 73° – 87° |
| September | 83° | 60° | 3.0" | 0 | 6 | 0 | 66° – 79° |
| October | 71° | 47° | 3.2" | 0.1" | 6 | 0 | 52° – 65° |
| November | 58° | 35° | 1.8" | 0.4" | 4 | 0 | 40° – 54° |
| December | 46° | 26° | 1.3" | 3.3" | 4 | 3 | 24° – 41° |
| Year | 69° | 46° | 35.9" | 10.8" | 74 | 10 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Derby
Derby gets 36 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 74 days a year. Snow covers the ground about 10 days of the year.
About 189 frost-free days a year
In half of years the last 32° night comes by April 14 and the first one by October 22. That leaves about 189 frost-free days for gardens, longer than 63% of U.S. towns.
Heating and cooling a home in Derby
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Derby, 74% of that work is heating and 26% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Derby and its neighbors
Derby borders 3 towns with climate data. January nights across them vary by 0.2°. Riverside has the coldest January nights (23°) and Rockford the hottest July afternoons (92°). Derby’s January low is 23° and its July high 92°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Derby compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Derby averaged 1.0° warmer than the 1900s. The biggest change is in January (+2.6°). The shift is smaller than in 71% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Derby’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 40° to 58°. June is the most reliable, staying within 11°.
Common questions about Derby’s climate
What is the coldest month in Derby?
January, with a typical high of 44° and a low of 23°.
What is the hottest month in Derby?
July, with a typical high of 92° and a low of 70°. About 60 days a year reach 90°.
How much snow does Derby get?
About 11 inches in a normal winter, most of it in December.
When is the first frost in Derby?
In half of years the first 32° night comes by October 22, and the last spring frost by April 14.
What is the rainiest month in Derby?
May, with 5.5 inches of rain and melted snow. The year totals 36 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Derby itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Peck 2 S, KS (11 mi, snow) and Haysville 3se, KS (4 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.