Lamoni, Iowa climate: Normal weather by month, frost dates and records
Lamoni's normal year runs from 16°F January nights to 85°F July afternoons, with 37.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.9°C, January lows of −9°C, July highs of 30°C, 949 mm of precipitation a year.
- NOAA stationLamoni Municipal Airport
- Station IDUSW00094991
- Location40.63°N 93.90°W
- Elevation1,131 ft (345 m)
- Population2,072
On October 23, the normal high in Lamoni is 61°F and the normal low 41°F, and the chance of measurable rain or snow is 27%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Lamoni.
- Jan 33° 16°
- Feb 38° 20°
- Mar 51° 31°
- Apr 63° 41°
- May 72° 53°
- Jun 82° 62°
- Jul 85° 66°
- Aug 84° 64°
- Sep 77° 55°
- Oct 64° 43°
- Nov 50° 31°
- Dec 38° 21°
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 Lamoni each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 16°F. The most precipitation falls in May (5.14 in), the least in January (1.04 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 33°F | 16°F | 24.3°F | 1.04 | 6 | <1 | 29 | 9 h 30 min |
| February | 38°F | 20°F | 28.8°F | 1.35 | 7 | <1 | 24 | 10 h 40 min |
| March | 51°F | 31°F | 40.8°F | 2.20 | 10 | <1 | 19 | 11 h 50 min |
| April | 63°F | 41°F | 52.0°F | 4.25 | 11 | <1 | 5 | 13 h 10 min |
| May | 72°F | 53°F | 62.3°F | 5.14 | 13 | <1 | <1 | 14 h 20 min |
| June | 82°F | 62°F | 71.8°F | 4.81 | 12 | 3 | <1 | 15 h |
| July | 85°F | 66°F | 75.8°F | 4.11 | 9 | 9 | <1 | 14 h 50 min |
| August | 84°F | 64°F | 73.9°F | 4.38 | 10 | 6 | <1 | 13 h 50 min |
| September | 77°F | 55°F | 65.9°F | 3.71 | 9 | 2 | <1 | 12 h 30 min |
| October | 64°F | 43°F | 53.6°F | 2.82 | 9 | <1 | 4 | 11 h 10 min |
| November | 50°F | 31°F | 40.4°F | 2.09 | 7 | <1 | 16 | 10 h |
| December | 38°F | 21°F | 29.3°F | 1.48 | 7 | <1 | 27 | 9 h 20 min |
| Year (annual) | 61°F | 42°F | 51.6°F | 37.38 | 109 | 21 | 125 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −9°C | −4.3°C | 26 mm |
| February | 3°C | −7°C | −1.8°C | 34 mm |
| March | 10°C | −1°C | 4.9°C | 56 mm |
| April | 17°C | 5°C | 11.1°C | 108 mm |
| May | 22°C | 11°C | 16.8°C | 131 mm |
| June | 28°C | 17°C | 22.1°C | 122 mm |
| July | 30°C | 19°C | 24.3°C | 104 mm |
| August | 29°C | 18°C | 23.3°C | 111 mm |
| September | 25°C | 13°C | 18.8°C | 94 mm |
| October | 18°C | 6°C | 12.0°C | 72 mm |
| November | 10°C | 0°C | 4.7°C | 53 mm |
| December | 3°C | −6°C | −1.5°C | 38 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. Lamoni's own co-op station Lamoni station does: 27 inches of snow in a normal year (see the other stations below).
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094991; 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 Lamoni?
Normal highs sit between 65°F and 85°F in May, June, August and September. Of those, September has the fewest days with rain (9).
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 USW00094991.
When is the last frost in Lamoni?
In Lamoni, the last spring frost (32°F) comes after April 16 in half of years and after May 2 in one year in ten; the first autumn frost comes before October 21 in half of years and before October 6 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
- April 161 year in 10 after May 2; 9 in 10 after April 2
- First autumn frost, half of years before
- October 211 year in 10 before October 6; 9 in 10 before November 1
NOAA puts the median frost-free season at 186 days, and the season without a hard freeze (28°F) at 205 days.
A hard freeze (28°F) comes after April 6 in half of springs and before October 30 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Lamoni in zone 5b in ZIP code 50140, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Lamoni's NOAA station is in zone 5b: the coldest night of a typical year reaches −11°F (22 complete years).
Frost dates for every NOAA station in Iowa · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00094991; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. 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 Lamoni?
In a normal year in Lamoni, 21 days a year reach 90°F (1 of them 100°F or more), 125 nights fall to 32°F or colder and 109 days bring measurable precipitation.
- Days at 90°F or more
- 21a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 125a normal year
- Days that stay below freezing
- 41high of 32°F or less
- Days with 0.01 inch of precipitation
- 109a normal year
The highest temperature in this station's record (since 1998) is 105°F, on July 7, 2012; the lowest is −20°F, on January 30, 2019.
The wettest calendar year on that record is 2010, with 51.33 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00094991; records: ACIS (NOAA Regional Climate Centers), station USW00094991. Records use complete months only; a month missing more than three days is left out.
How sunny is Lamoni?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Lamoni, 4.1 kWh per square metre a day. July is the sunniest month (82%) and January the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 66% | 2.0 |
| February | 70% | 2.9 |
| March | 68% | 3.8 |
| April | 70% | 4.9 |
| May | 72% | 5.7 |
| June | 78% | 6.4 |
| July | 82% | 6.4 |
| August | 80% | 5.6 |
| September | 81% | 4.7 |
| October | 74% | 3.2 |
| November | 72% | 2.3 |
| December | 68% | 1.8 |
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 Lamoni need?
A normal year in Lamoni brings 5,895 heating degree days, 10% more than the median U.S. place (5,373), and 1,038 cooling degree days, 14% more 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 3,476 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,260 | 0 |
| February | 1,012 | 0 |
| March | 753 | 2 |
| April | 399 | 8 |
| May | 149 | 64 |
| June | 15 | 220 |
| July | 2 | 337 |
| August | 5 | 279 |
| September | 87 | 112 |
| October | 368 | 16 |
| November | 738 | 0 |
| December | 1,107 | 0 |
| Year (annual) | 5,895 | 1,038 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094991. 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.
Has Lamoni been warmer than normal lately?
2025 averaged 52.3°F, 0.7°F above the 1991-2020 normal of 51.6°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 52.9°F | +1.3°F | 37.52 |
| 2022 | 51.3°F | −0.3°F | 28.64 |
| 2023 | 53.7°F | +2.1°F | 29.11 |
| 2024 | 54.1°F | +2.5°F | 37.44 |
| 2025 | 52.3°F | +0.7°F | 31.89 |
Source: observed years: ACIS, station USW00094991. A year counts only with all twelve months complete.
How does Lamoni's climate compare?
Lamoni is warmer than 126 of the other 131 places with their own NOAA record in Iowa, and wetter than 80. Across the 7,247 U.S. stations with normals, its annual mean of 51.6°F is warmer than 48%.
In the Köppen classification computed from these normals, Lamoni 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 Lamoni share this climate record?
6 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.
- Ridgeway, MO377 people · 18 mi S
- Cainsville, MO282 people · 15 mi SE
- Eagleville, MO280 people · 12 mi S
- Blythedale, MO210 people · 11 mi S
- Davis City, IA178 people · 5 mi E
- Decatur, IA174 people · 8 mi NE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Lamoni's other NOAA stations record?
2 more NOAA stations keep 1991-2020 normals in or near Lamoni. This page uses Lamoni Municipal Airport; the others differ by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Lamoni station USW00014993 | 5 mi W | 1,168 ft | 51.2°F | 15°F | 85°F | – | – | April 16 |
| Lamoni station USC00134585 | 2 mi W | 1,128 ft | 51.5°F | 14°F | 87°F | 41.0 | 27 | April 17 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Lamoni's climate
What is the coldest month in Lamoni?
January, with a normal high of 33°F and a normal low of 16°F. The warmest is July (85°F by day, 66°F at night).
Does it snow in Lamoni?
Yes. NOAA publishes no 1991-2020 snowfall normal for Lamoni's NOAA station; Lamoni's own co-op station Lamoni station records 27 inches of snow in a normal year.
What is the rainiest month in Lamoni?
May, with 5.14 in of precipitation in a normal year; the driest is January with 1.04 in.
What plant hardiness zone is Lamoni in?
The USDA's 2023 map puts Lamoni in zone 5b in ZIP code 50140, the nearest ZIP area. By the same method at Lamoni's NOAA station, the coldest night of a typical year reaches −11°F (22 years, 1991-2020): zone 5b.
How late can frost come in Lamoni?
In half of years the last 32°F night comes after April 16; in one year in ten it comes after May 2. Waiting until May 2 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Iowa climateThe statewide normals and every place in the state
- Beaconsfield, IA14 miles from this station, 49.2°F a year
- Leon, IA15 miles from this station, 49.6°F a year
- Mount Ayr, IA19 miles from this station, 49.6°F a year
- Princeton, MO23 miles from this station, 51.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made