Climate Insights for Rock Rapids Municipal Airport

Sully County, Iowa, United States

Hottest
July
29°C peak
Coldest
January
-10°C low
Wettest
May
133mm rain
Best to Visit
July
Mild temps & low rain

Climate Overview

The climate in Rock Rapids Municipal Airport is cool. The average annual temperature is 9°C and approximately 915mm of precipitation falls per year. May is the wettest month, receiving around 133mm of rainfall. Rock Rapids Municipal Airport is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are January, February, December, when temperatures can drop to -10°C. Snowfall occurs from January to December, with around 134cm accumulating over the season.

Temperature

-10° 10° 20° 30° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: -2° Average: -7° Min: -10° Feb Max: 0° Average: -5° Min: -9° Mar Max: 7° Average: 2° Min: -2° Apr Max: 15° Average: 8° Min: 3° May Max: 21° Average: 15° Min: 10° Jun Max: 28° Average: 22° Min: 17° Jul Max: 29° Average: 24° Min: 19° Aug Max: 27° Average: 21° Min: 16° Sep Max: 24° Average: 18° Min: 14° Oct Max: 14° Average: 8° Min: 4° Nov Max: 8° Average: 2° Min: -2° Dec Max: 0° Average: -4° Min: -8°
Max
Average
Min

Rock Rapids Municipal Airport has a wide annual temperature range, spanning 39°C from the coldest to warmest months. The warmest month is July, when average highs reach 29°C and the mean temperature sits around 24°C. The coldest month is January, when overnight lows fall to -10°C and the daily average is -7°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 10°C shift in average temperatures.

Precipitation

0mm 25mm 50mm 75mm 100mm 125mm 150mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Precipitation: 27mm Snow: 23mm Feb Precipitation: 31mm Snow: 27mm Mar Precipitation: 66mm Snow: 23mm Apr Precipitation: 102mm Snow: 18mm May Precipitation: 133mm Snow: 3mm Jun Precipitation: 107mm Snow: 0mm Jul Precipitation: 80mm Snow: 0mm Aug Precipitation: 108mm Snow: 0mm Sep Precipitation: 109mm Snow: 0mm Oct Precipitation: 77mm Snow: 4mm Nov Precipitation: 37mm Snow: 14mm Dec Precipitation: 38mm Snow: 23mm
Precipitation
Snow

Rock Rapids Municipal Airport is a moderately rainy area, receiving approximately 915mm of precipitation annually, which averages out to around 76mm per month. The wettest month is May, averaging 133mm of rainfall. September and August also tend to see above-average precipitation. The driest month is January, with just 27mm. That's 106mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 134cm accumulating over the season. February typically sees the most snow at around 27cm.

Wind

0km/h 5km/h Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 4km/h Feb Wind Speed: 4km/h Mar Wind Speed: 5km/h Apr Wind Speed: 5km/h May Wind Speed: 4km/h Jun Wind Speed: 4km/h Jul Wind Speed: 4km/h Aug Wind Speed: 3km/h Sep Wind Speed: 4km/h Oct Wind Speed: 5km/h Nov Wind Speed: 4km/h Dec Wind Speed: 4km/h
Wind Speed

Rock Rapids Municipal Airport is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

Seasons

Winter
Dec 21
Spring
Mar 20
Summer
Jun 21
Autumn
Sep 23

75 days until Autumn

It is currently summer in Rock Rapids Municipal Airport, which began on June 21, 2026. Rock Rapids Municipal Airport is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 29°C, while the coldest stretch bottoms out in January near -10°C. Autumn is next, beginning on September 23, 2026 — 75 days from now.

Spring

Temperatures range from -2 to 21°C. Precipitation is moderate at around 301mm for the season, averaging 100mm per month. Winds are generally light, averaging 4km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 16 to 29°C. Precipitation is moderate at around 295mm for the season, averaging 98mm per month. Winds are generally light, averaging 4km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.

Autumn

Temperatures range from -2 to 24°C. Precipitation is moderate at around 223mm for the season, averaging 74mm per month. Expect around 18cm of snow accumulation during this period. Winds are generally light, averaging 4km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from -10 to 0°C. Rainfall is relatively light, with around 96mm over the season and a monthly average of 32mm. Expect around 73cm of snow accumulation during this period. Winds are generally light, averaging 4km/h. Heavy layering and insulated outerwear are essential — exposed skin should be minimised outdoors.

Best Time to Visit

Jan -7°
Feb -5°
Mar
Apr
May 15°
Jun 22°
Jul 24°
Aug 21°
Sep 18°
Oct
Nov
Dec -4°

The best time to visit Rock Rapids Municipal Airport is during July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 80mm per month. By contrast, January can be quite cold with temperatures dropping to -10°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

Monthly Climate Data

The table below shows monthly climate averages for Rock Rapids Municipal Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.

Month
Min Temperature
Max Temperature
Wind Speed
Precipitation
Snow
Jan
-10 °C
-2 °C
4 km/h
27 mm
23 cm
Feb
-9 °C
0 °C
4 km/h
31 mm
27 cm
Mar
-2 °C
7 °C
5 km/h
66 mm
23 cm
Apr
3 °C
15 °C
5 km/h
102 mm
18 cm
May
10 °C
21 °C
4 km/h
133 mm
3 cm
Jun
17 °C
28 °C
4 km/h
107 mm
0 cm
Jul Current
19 °C
29 °C
4 km/h
80 mm
0 cm
Aug
16 °C
27 °C
3 km/h
108 mm
0 cm
Sep
14 °C
24 °C
4 km/h
109 mm
0 cm
Oct
4 °C
14 °C
5 km/h
77 mm
4 cm
Nov
-2 °C
8 °C
4 km/h
37 mm
14 cm
Dec
-8 °C
0 °C
4 km/h
38 mm
23 cm
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