Climate and monthly weather forecastDerby, IA
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Derby, Iowa, with an average temperature varying between 29.3°F (-1.5°C) and 16°F (-8.9°C). January is the coldest month, with an average high-temperature of 29.3°F (-1.5°C) and an average low-temperature of 16°F (-8.9°C). Weather in January »Weather in February
February, the last month of the winter in Derby, is a cold month, with temperature in the range of an average high of 33.3°F (0.7°C) and an average low of 18.9°F (-7.3°C). Derby observes an average high-temperature of a wintry 33.3°F (0.7°C) in February, barely different from 29.3°F (-1.5°C) in January. Weather in February »Weather in March
March, the first month of the spring in Derby, is a frosty month, with an average temperature varying between 47.8°F (8.8°C) and 32.5°F (0.3°C). As Derby steps into March, a marked temperature rise is observed, with the average high-temperature advancing from February's cold 33.3°F (0.7°C) to a frosty 47.8°F (8.8°C). Weather in March »Weather in April
April is a moderate spring month in Derby, Iowa, with temperature in the range of an average high of 60.1°F (15.6°C) and an average low of 42.4°F (5.8°C). The start of April signals an increase in the average high-temperature, moving from a chilly 47.8°F (8.8°C) in March to a refreshing 60.1°F (15.6°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Derby, Iowa, with temperature in the range of an average high of 69.4°F (20.8°C) and an average low of 52.7°F (11.5°C). With the arrival of May, the average high-temperature transitions from a mild 60.1°F (15.6°C) in April to an agreeable 69.4°F (20.8°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Derby, Iowa, with an average temperature varying between 63.1°F (17.3°C) and 79.7°F (26.5°C). June brings a rise in Derby's average high-temperature, moving from a pleasant 69.4°F (20.8°C) in May to a warm 79.7°F (26.5°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Derby, Iowa, with an average temperature ranging between min 65.7°F (18.7°C) and max 83.1°F (28.4°C). With average high temperatures of 83.1°F (28.4°C) and lows of 65.7°F (18.7°C), July is the warmest month. Throughout July, the heat index is evaluated at a hot 91.4°F (33°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Derby, Iowa, with an average temperature varying between 62.8°F (17.1°C) and 81.7°F (27.6°C). The transition from July to August brings an average high-temperature of a still warm 81.7°F (27.6°C), barely different from July's 83.1°F (28.4°C). Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Derby, Iowa, with an average temperature ranging between min 56.3°F (13.5°C) and max 75.7°F (24.3°C). The onset of September aligns with a soft reduction in the average high-temperature, gently falling from a warm 81.7°F (27.6°C) in August to a still moderately hot 75.7°F (24.3°C). Weather in September »Weather in October
October, like September, in Derby, Iowa, is another enjoyable autumn month, with an average temperature fluctuating between 61.3°F (16.3°C) and 44.6°F (7°C). The changeover to October signals a significant decrease in the average high-temperature, dropping from a moderately hot 75.7°F (24.3°C) in September to an enjoyable 61.3°F (16.3°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Derby, Iowa, with temperature in the range of an average low of 32.7°F (0.4°C) and an average high of 48°F (8.9°C). With November's arrival, Derby sees a decrease in average high-temperatures, moving from an enjoyable 61.3°F (16.3°C) in October to a frosty 48°F (8.9°C). Weather in November »Weather in December
December, the first month of the winter in Derby, is still a cold month, with an average temperature varying between 34.9°F (1.6°C) and 23.2°F (-4.9°C). Derby's December weather features a mild decline in high-temperatures, reducing from a chilly 48°F (8.9°C) in November to a wintry 34.9°F (1.6°C). Weather in December »Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, noted for its average high-temperature of 29.3°F (-1.5°C) and an average low-temperature of 16°F (-8.9°C), is considered the coldest month.
The month with the least rainfall in Derby, Iowa, is January, when the rain falls for 4.7 days and typically collects 0.94" (24mm) of precipitation.
Throughout the year, there are 131.1 rainfall days, and 25.71" (653mm) of precipitation is accumulated.
January through May, October through December are months with snowfall in Derby.
Throughout the year, there are 33.4 snowfall days, and 13.54" (344mm) of snow is accumulated.
The month with the least sunshine is January, with an average of 4.2h of sunshine.
January is the month with the lowest UV index in Derby, with an average maximum UV index of 1.
February is the month with the most snowfall. Snow falls for 8.1 days and accumulates 4.13" (105mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Derby, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
The most humid month in Derby is June, with an average relative humidity of 83%.
The month with the most rainfall is June, when the rain falls for 16.3 days and typically aggregates up to 3.74" (95mm) of precipitation.
June through September are months without snowfall.
With an average of 15h and 6min of daylight, June has the longest days of the year in Derby, Iowa.
The months with the highest UV index in Derby, Iowa, are June through August, with an average maximum UV index of 6.
With average high and low temperatures of 83.1°F (28.4°C) and 65.7°F (18.7°C) respectively, July is Derby's warmest month.
The month with the most sunshine in Derby is July, with an average of 10.2h of sunshine.
October is the least humid month in Derby, Iowa, with an average relative humidity of 72%.
With an average of 9h and 18min of daylight, December has the shortest days of the year in Derby.
Average temperature
Derby, IA
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (29.3°F).
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (16°F).
Average pressure
Derby, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.92"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
Derby, IA
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.6mph - Average wind speed in April:
10.5mph - Average wind speed in May:
8.9mph - Average wind speed in June:
8.1mph
- Average wind speed in July:
7.1mph - Average wind speed in August:
7.1mph - Average wind speed in September:
8.1mph - Average wind speed in October:
9.6mph - Average wind speed in November:
10.6mph - Average wind speed in December:
10.3mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity
Derby, IA
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Derby, IA
- Average rainfall in January:
0.94" - Average rainfall in February:
1.06" - Average rainfall in March:
2.01" - Average rainfall in April:
2.48" - Average rainfall in May:
3.7" - Average rainfall in June:
3.74"
- Average rainfall in July:
2.17" - Average rainfall in August:
2.32" - Average rainfall in September:
2.72" - Average rainfall in October:
2.05" - Average rainfall in November:
1.46" - Average rainfall in December:
1.06"
The wettest month (with the highest rainfall) is June (3.74").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days
Derby, IA
- Average rainfall days in January:
4.7 days - Average rainfall days in February:
5.3 days - Average rainfall days in March:
11.3 days - Average rainfall days in April:
14.5 days - Average rainfall days in May:
16.7 days - Average rainfall days in June:
16.3 days
- Average rainfall days in July:
13.8 days - Average rainfall days in August:
12.7 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
7.7 days - Average rainfall days in December:
6.1 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is January (4.7 days).
Average snowfall
Derby, IA
- Average snowfall in January:
3.78" - Average snowfall in February:
4.13" - Average snowfall in March:
1.54" - Average snowfall in April:
1.38" - Average snowfall in May:
0.28" - Average snowfall in June:
0"
The month with the highest snowfall is February (4.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Derby, IA
- Average snowfall days in January:
10.2 days - Average snowfall days in February:
8.1 days - Average snowfall days in March:
4.3 days - Average snowfall days in April:
1.3 days - Average snowfall days in May:
0.3 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.6 days - Average snowfall days in November:
2.2 days - Average snowfall days in December:
6.4 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Derby, IA
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 12min - Average sunshine in February:
4h and 42min - Average sunshine in March:
6h and 0min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 30min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
10h and 12min - Average sunshine in August:
9h and 42min - Average sunshine in September:
9h and 12min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days
Derby, IA
- Average sunshine days in January:
17.5 days - Average sunshine days in February:
16.1 days - Average sunshine days in March:
15.8 days - Average sunshine days in April:
13.4 days - Average sunshine days in May:
11.5 days - Average sunshine days in June:
10.7 days
- Average sunshine days in July:
14.1 days - Average sunshine days in August:
16 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
18 days - Average sunshine days in November:
19.3 days - Average sunshine days in December:
19.1 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is June (10.7 days).
Average UV index
Derby, IA
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Derby, IA
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility
Derby, IA
The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).
