Anamosa, Iowa climate: Normal weather by month, frost dates and records
Anamosa's normal year runs from 9°F January nights to 83°F July afternoons, with 40.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.3°C, January lows of −13°C, July highs of 28°C, 1,020 mm of precipitation a year.
- NOAA stationAnamosa (1 mi WNW)
- Station IDUSC00130213
- Location42.11°N 91.29°W
- Elevation805 ft (245 m)
- From the centerunder 1 mile
- Population5,845
On October 24, the normal high in Anamosa is 57°F and the normal low 35°F, and the chance of measurable rain or snow is 22%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Anamosa.
- Jan 27° 9°
- Feb 32° 12°
- Mar 45° 25°
- Apr 59° 36°
- May 70° 47°
- Jun 80° 58°
- Jul 83° 62°
- Aug 81° 59°
- Sep 75° 50°
- Oct 61° 38°
- Nov 46° 26°
- Dec 33° 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 Anamosa 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 (5.78 in), the least in January (1.47 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 27°F | 9°F | 17.8°F | 1.47 | 6 | <1 | 30 | 9 h 30 min |
| February | 32°F | 12°F | 21.9°F | 1.56 | 5 | <1 | 26 | 10 h 30 min |
| March | 45°F | 25°F | 34.9°F | 1.80 | 6 | <1 | 24 | 11 h 50 min |
| April | 59°F | 36°F | 47.5°F | 3.99 | 9 | <1 | 10 | 13 h 20 min |
| May | 70°F | 47°F | 58.7°F | 4.80 | 10 | 1 | 2 | 14 h 30 min |
| June | 80°F | 58°F | 68.9°F | 5.78 | 11 | 3 | <1 | 15 h 10 min |
| July | 83°F | 62°F | 72.3°F | 5.23 | 9 | 5 | <1 | 15 h |
| August | 81°F | 59°F | 70.1°F | 4.46 | 9 | 4 | <1 | 14 h |
| September | 75°F | 50°F | 62.1°F | 3.72 | 8 | 1 | 1 | 12 h 30 min |
| October | 61°F | 38°F | 49.6°F | 3.24 | 7 | <1 | 9 | 11 h 10 min |
| November | 46°F | 26°F | 36.0°F | 2.26 | 6 | <1 | 21 | 9 h 50 min |
| December | 33°F | 16°F | 24.6°F | 1.84 | 7 | <1 | 29 | 9 h 10 min |
| Year (annual) | 58°F | 36°F | 47.0°F | 40.15 | 93 | 13 | 152 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −3°C | −13°C | −7.9°C | 37 mm |
| February | 0°C | −11°C | −5.6°C | 40 mm |
| March | 7°C | −4°C | 1.6°C | 46 mm |
| April | 15°C | 2°C | 8.6°C | 101 mm |
| May | 21°C | 8°C | 14.8°C | 122 mm |
| June | 27°C | 14°C | 20.5°C | 147 mm |
| July | 28°C | 17°C | 22.4°C | 133 mm |
| August | 27°C | 15°C | 21.2°C | 113 mm |
| September | 24°C | 10°C | 16.7°C | 94 mm |
| October | 16°C | 3°C | 9.8°C | 82 mm |
| November | 8°C | −3°C | 2.2°C | 57 mm |
| December | 1°C | −9°C | −4.1°C | 47 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Marion (16 miles away), gets 34 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00130213; 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 Anamosa?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (8).
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 USC00130213.
When is the last frost in Anamosa?
In Anamosa, the last spring frost (32°F) comes after May 1 in half of years and after May 18 in one year in ten; the first autumn frost comes before October 4 in half of years and before September 21 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 11 year in 10 after May 18; 9 in 10 after April 18
- First autumn frost, half of years before
- October 41 year in 10 before September 21; 9 in 10 before October 18
NOAA puts the median frost-free season at 154 days, and the season without a hard freeze (28°F) at 175 days.
A hard freeze (28°F) comes after April 21 in half of springs and before October 16 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Anamosa in zone 5a in ZIP code 52205, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Anamosa's NOAA station is in zone 5a: the coldest night of a typical year reaches −18°F (16 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 USC00130213; 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 Anamosa?
In a normal year in Anamosa, 13 days a year reach 90°F, 152 nights fall to 32°F or colder and 93 days bring measurable precipitation.
- Days at 90°F or more
- 13a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 152a normal year
- Days that stay below freezing
- 55high of 32°F or less
- Days with 0.01 inch of precipitation
- 93a normal year
The highest temperature in this station's record (since 1937) is 104°F, on July 25, 1940; the lowest is −37°F, on January 17, 2009.
The wettest calendar year on that record is 1993, with 57.27 in; the snowiest season is 1961–62, with 63.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00130213; records: ACIS (NOAA Regional Climate Centers), station USC00130213. Records use complete months only; a month missing more than three days is left out.
How sunny is Anamosa?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Anamosa, 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 Anamosa need?
A normal year in Anamosa brings 7,183 heating degree days, 34% more than the median U.S. place (5,373), and 672 cooling degree days, 26% 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 2,766 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,461 | 0 |
| February | 1,205 | 0 |
| March | 935 | 0 |
| April | 529 | 4 |
| May | 233 | 37 |
| June | 36 | 153 |
| July | 7 | 233 |
| August | 21 | 177 |
| September | 147 | 60 |
| October | 484 | 8 |
| November | 871 | 0 |
| December | 1,254 | 0 |
| Year (annual) | 7,183 | 672 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00130213. 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 Anamosa's climate compare?
Anamosa is warmer than 45 of the other 131 places with their own NOAA record in Iowa, and wetter than 127. Across the 7,247 U.S. stations with normals, its annual mean of 47.0°F is warmer than 28%.
In the Köppen classification computed from these normals, Anamosa 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 Anamosa 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.
- Monticello, IA4,095 people · 10 mi NE
- Olin, IA652 people · 11 mi SE
- Martelle, IA250 people · 7 mi SW
- Center Junction, IA125 people · 10 mi E
- Stone City, IA122 people · 3 mi W
- Morley, IA94 people · 8 mi S
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 Anamosa's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Anamosa. This page uses Anamosa (1 mi WNW); the other differs by site and elevation:
| Station | From the center | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Anamosa (3 mi SSW) USC00130214 | 3 mi SW | 906 ft | 48.0°F | 11°F | 83°F | 39.3 | – | April 27 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Anamosa's climate
What is the coldest month in Anamosa?
January, with a normal high of 27°F and a normal low of 9°F. The warmest is July (83°F by day, 62°F at night).
Does it snow in Anamosa?
Yes. NOAA publishes no 1991-2020 snowfall normal for Anamosa's NOAA station; the nearest record that keeps one, Marion (16 miles away), records 34 inches of snow in a normal year.
What is the rainiest month in Anamosa?
June, with 5.78 in of precipitation in a normal year; the driest is January with 1.47 in.
What plant hardiness zone is Anamosa in?
The USDA's 2023 map puts Anamosa in zone 5a in ZIP code 52205, the nearest ZIP area. By the same method at Anamosa's NOAA station, the coldest night of a typical year reaches −18°F (16 years, 1991-2020): zone 5a.
How late can frost come in Anamosa?
In half of years the last 32°F night comes after May 1; in one year in ten it comes after May 18. Waiting until May 18 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Iowa climateThe statewide normals and every place in the state
- Marion, IA16 miles from this station, 49.9°F a year
- Coggon, IA17 miles from this station, 46.5°F a year
- Cascade, IA19 miles from this station, 47.9°F a year
- Tipton, IA24 miles from this station, 49.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made