Coggon, Iowa climate: Normal weather by month, frost dates and records
Coggon's normal year runs from 9°F January nights to 83°F July afternoons, with 39.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.1°C, January lows of −13°C, July highs of 28°C, 994 mm of precipitation a year.
- NOAA stationCoggon
- Station IDUSC00131705
- Location42.28°N 91.53°W
- Elevation903 ft (275 m)
- From the centerunder 1 mile
- Population691
On October 23, the normal high in Coggon is 57°F and the normal low 35°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Coggon.
- Jan 26° 9°
- Feb 31° 13°
- Mar 44° 24°
- Apr 58° 34°
- May 70° 46°
- Jun 80° 57°
- Jul 83° 61°
- Aug 81° 58°
- Sep 75° 49°
- Oct 61° 37°
- Nov 45° 26°
- Dec 32° 16°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Coggon each month?
July is the warmest month, with normal highs of 83°F; January the coldest, with normal lows of 9°F. The most precipitation falls in June (5.87 in), the least in January (1.22 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 26°F | 9°F | 17.7°F | 1.22 | – | <1 | 30 | 9 h 20 min |
| February | 31°F | 13°F | 21.9°F | 1.29 | – | <1 | 28 | 10 h 30 min |
| March | 44°F | 24°F | 34.0°F | 2.03 | – | <1 | 26 | 11 h 50 min |
| April | 58°F | 34°F | 46.4°F | 3.91 | – | <1 | 12 | 13 h 20 min |
| May | 70°F | 46°F | 57.8°F | 4.78 | – | 1 | 2 | 14 h 30 min |
| June | 80°F | 57°F | 68.4°F | 5.87 | – | 3 | <1 | 15 h 10 min |
| July | 83°F | 61°F | 71.8°F | 4.96 | – | 5 | <1 | 15 h |
| August | 81°F | 58°F | 69.5°F | 4.29 | – | 2 | <1 | 14 h |
| September | 75°F | 49°F | 61.9°F | 3.94 | – | 1 | 1 | 12 h 30 min |
| October | 61°F | 37°F | 49.3°F | 3.08 | – | <1 | 11 | 11 h 10 min |
| November | 45°F | 26°F | 35.6°F | 2.22 | – | <1 | 22 | 9 h 50 min |
| December | 32°F | 16°F | 23.9°F | 1.56 | – | <1 | 29 | 9 h 10 min |
| Year (annual) | 57°F | 36°F | 46.5°F | 39.15 | – | 11 | 160 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −3°C | −13°C | −7.9°C | 31 mm |
| February | −1°C | −11°C | −5.6°C | 33 mm |
| March | 7°C | −5°C | 1.1°C | 52 mm |
| April | 15°C | 1°C | 8.0°C | 99 mm |
| May | 21°C | 8°C | 14.3°C | 121 mm |
| June | 26°C | 14°C | 20.2°C | 149 mm |
| July | 28°C | 16°C | 22.1°C | 126 mm |
| August | 27°C | 14°C | 20.8°C | 109 mm |
| September | 24°C | 9°C | 16.6°C | 100 mm |
| October | 16°C | 3°C | 9.6°C | 78 mm |
| November | 7°C | −3°C | 2.0°C | 56 mm |
| December | 0°C | −9°C | −4.5°C | 40 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Manchester (14 miles away), gets 35 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00131705; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Coggon?
Normal highs sit between 65°F and 85°F in May, June, July, August and September.
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00131705.
When is the last frost in Coggon?
In Coggon, the last spring frost (32°F) comes after May 3 in half of years and after May 17 in one year in ten; the first autumn frost comes before October 7 in half of years and before September 22 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 31 year in 10 after May 17; 9 in 10 after April 18
- First autumn frost, half of years before
- October 71 year in 10 before September 22; 9 in 10 before October 20
NOAA puts the median frost-free season at 156 days, and the season without a hard freeze (28°F) at 176 days.
A hard freeze (28°F) comes after April 22 in half of springs and before October 18 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Coggon in zone 5a in ZIP code 52218, the nearest ZIP area.
Frost dates for every NOAA station in Iowa · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00131705; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Coggon?
In a normal year in Coggon, 11 days a year reach 90°F and 160 nights fall to 32°F or colder.
- Days at 90°F or more
- 11a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 160a normal year
- Days that stay below freezing
- 64high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00131705.
How sunny is Coggon?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Coggon, 4.0 kWh per square metre a day. July is the sunniest month (80%) and December the cloudiest (63%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.8 |
| February | 72% | 2.9 |
| March | 70% | 3.8 |
| April | 68% | 4.7 |
| May | 71% | 5.6 |
| June | 75% | 6.2 |
| July | 80% | 6.3 |
| August | 80% | 5.5 |
| September | 79% | 4.4 |
| October | 70% | 2.9 |
| November | 69% | 2.0 |
| December | 63% | 1.5 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Coggon need?
A normal year in Coggon brings 7,318 heating degree days, 36% more than the median U.S. place (5,373), and 614 cooling degree days, 32% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,670 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,466 | 0 |
| February | 1,207 | 0 |
| March | 964 | 1 |
| April | 560 | 2 |
| May | 258 | 35 |
| June | 35 | 138 |
| July | 7 | 218 |
| August | 19 | 157 |
| September | 151 | 57 |
| October | 496 | 8 |
| November | 882 | 0 |
| December | 1,274 | 0 |
| Year (annual) | 7,318 | 614 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00131705. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Coggon's climate compare?
Coggon is warmer than 29 of the other 131 places with their own NOAA record in Iowa, and wetter than 115. Across the 7,247 U.S. stations with normals, its annual mean of 46.5°F is warmer than 25%.
In the Köppen classification computed from these normals, Coggon is Dfa: continental, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Coggon share this climate record?
4 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Central City, IA1,254 people · 5 mi S
- Walker, IA671 people · 13 mi W
- Ryan, IA348 people · 5 mi N
- Prairieburg, IA156 people · 6 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Coggon's climate
What is the coldest month in Coggon?
January, with a normal high of 26°F and a normal low of 9°F. The warmest is July (83°F by day, 61°F at night).
Does it snow in Coggon?
Yes. NOAA publishes no 1991-2020 snowfall normal for Coggon's NOAA station; the nearest record that keeps one, Manchester (14 miles away), records 35 inches of snow in a normal year.
What is the rainiest month in Coggon?
June, with 5.87 in of precipitation in a normal year; the driest is January with 1.22 in.
What plant hardiness zone is Coggon in?
The USDA's 2023 map puts Coggon in zone 5a in ZIP code 52218, the nearest ZIP area.
How late can frost come in Coggon?
In half of years the last 32°F night comes after May 3; in one year in ten it comes after May 17. Waiting until May 17 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Iowa climateThe statewide normals and every place in the state
- Manchester, IA14 miles from this station, 46.3°F a year
- Marion, IA16 miles from this station, 49.9°F a year
- Anamosa, IA17 miles from this station, 47.0°F a year
- Independence, IA25 miles from this station, 47.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made