Bloomfield, Iowa climate: Normal weather by month, frost dates and records
Bloomfield's normal year runs from 15°F January nights to 86°F July afternoons, with 39.1 inches of precipitation and 24 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.7°C, January lows of −10°C, July highs of 30°C, 993 mm of precipitation a year.
- NOAA stationBloomfield
- Station IDUSC00130753
- Location40.74°N 92.41°W
- Elevation858 ft (262 m)
- From the centerunder 1 mile
- Population2,773
On October 22, the normal high in Bloomfield is 62°F and the normal low 41°F, and the chance of measurable rain or snow is 26%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Bloomfield.
- Jan 32° 15°
- Feb 37° 19°
- Mar 50° 30°
- Apr 62° 41°
- May 72° 52°
- Jun 81° 62°
- Jul 86° 66°
- Aug 84° 64°
- Sep 77° 55°
- Oct 64° 43°
- Nov 50° 31°
- Dec 37° 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 Bloomfield each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 15°F. The most precipitation falls in May (5.51 in), the least in January (1.23 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | 15°F | 23.4°F | 1.23 | 7.4 | 7 | <1 | 30 | 9 h 30 min |
| February | 37°F | 19°F | 27.6°F | 1.60 | 5.5 | 7 | <1 | 25 | 10 h 40 min |
| March | 50°F | 30°F | 39.5°F | 2.23 | 3.2 | 8 | <1 | 20 | 11 h 50 min |
| April | 62°F | 41°F | 51.2°F | 3.70 | 1.5 | 10 | <1 | 5 | 13 h 20 min |
| May | 72°F | 52°F | 62.1°F | 5.51 | 0.0 | 13 | <1 | <1 | 14 h 30 min |
| June | 81°F | 62°F | 71.7°F | 5.36 | 0.0 | 11 | 3 | <1 | 15 h |
| July | 86°F | 66°F | 75.9°F | 4.45 | 0.0 | 8 | 9 | <1 | 14 h 50 min |
| August | 84°F | 64°F | 74.0°F | 4.74 | 0.0 | 9 | 7 | <1 | 13 h 50 min |
| September | 77°F | 55°F | 66.0°F | 3.95 | 0.0 | 8 | 3 | <1 | 12 h 30 min |
| October | 64°F | 43°F | 53.8°F | 2.70 | 0.0 | 8 | <1 | 4 | 11 h 10 min |
| November | 50°F | 31°F | 40.4°F | 2.12 | 1.5 | 7 | <1 | 17 | 10 h |
| December | 37°F | 21°F | 28.9°F | 1.51 | 5.1 | 7 | <1 | 27 | 9 h 20 min |
| Year (annual) | 61°F | 42°F | 51.2°F | 39.10 | 24.2 | 103 | 22 | 128 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −10°C | −4.8°C | 31 mm | 19 cm |
| February | 3°C | −7°C | −2.4°C | 41 mm | 14 cm |
| March | 10°C | −1°C | 4.2°C | 57 mm | 8 cm |
| April | 17°C | 5°C | 10.7°C | 94 mm | 4 cm |
| May | 22°C | 11°C | 16.7°C | 140 mm | 0 cm |
| June | 27°C | 17°C | 22.1°C | 136 mm | 0 cm |
| July | 30°C | 19°C | 24.4°C | 113 mm | 0 cm |
| August | 29°C | 18°C | 23.3°C | 120 mm | 0 cm |
| September | 25°C | 13°C | 18.9°C | 100 mm | 0 cm |
| October | 18°C | 6°C | 12.1°C | 69 mm | 0 cm |
| November | 10°C | 0°C | 4.7°C | 54 mm | 4 cm |
| December | 3°C | −6°C | −1.7°C | 38 mm | 13 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00130753; 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 Bloomfield?
Normal highs sit between 65°F and 85°F in May, June, 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 USC00130753.
When is the last frost in Bloomfield?
In Bloomfield, the last spring frost (32°F) comes after April 16 in half of years and after April 30 in one year in ten; the first autumn frost comes before October 22 in half of years and before October 5 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 April 30; 9 in 10 after April 1
- First autumn frost, half of years before
- October 221 year in 10 before October 5; 9 in 10 before November 2
NOAA puts the median frost-free season at 188 days, and the season without a hard freeze (28°F) at 208 days.
A hard freeze (28°F) comes after April 6 in half of springs and before October 31 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Bloomfield in zone 5b in ZIP code 52537, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Bloomfield's NOAA station is in zone 5b: the coldest night of a typical year reaches −10°F (23 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 USC00130753; 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 Bloomfield?
In a normal year in Bloomfield, 22 days a year reach 90°F (1 of them 100°F or more), 128 nights fall to 32°F or colder and 103 days bring measurable precipitation.
- Days at 90°F or more
- 22a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 128a normal year
- Days that stay below freezing
- 41high of 32°F or less
- Days with 0.01 inch of precipitation
- 103a normal year
- Days with 1 inch of snow or more
- 10a normal year
The highest temperature in this station's record (since 1906) is 113°F, on July 15, 1936; the lowest is −29°F, on January 12, 1974.
The wettest calendar year on that record is 1973, with 57.66 in; the snowiest season is 1977–78, with 67.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00130753; records: ACIS (NOAA Regional Climate Centers), station USC00130753. Records use complete months only; a month missing more than three days is left out.
How sunny is Bloomfield?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Bloomfield, 4.1 kWh per square metre a day. September is the sunniest month (82%) and January the cloudiest (65%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 65% | 1.9 |
| February | 69% | 2.9 |
| March | 68% | 3.8 |
| April | 70% | 4.9 |
| May | 72% | 5.6 |
| June | 78% | 6.3 |
| July | 82% | 6.4 |
| August | 80% | 5.5 |
| September | 82% | 4.7 |
| October | 73% | 3.2 |
| November | 72% | 2.2 |
| December | 66% | 1.7 |
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 Bloomfield need?
A normal year in Bloomfield brings 6,035 heating degree days, 12% more than the median U.S. place (5,373), and 1,044 cooling degree days, 15% 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 3,456 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,291 | 0 |
| February | 1,046 | 0 |
| March | 792 | 1 |
| April | 421 | 7 |
| May | 154 | 64 |
| June | 16 | 217 |
| July | 1 | 339 |
| August | 5 | 284 |
| September | 86 | 115 |
| October | 363 | 16 |
| November | 740 | 0 |
| December | 1,121 | 0 |
| Year (annual) | 6,035 | 1,044 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00130753. 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 Bloomfield been warmer than normal lately?
Over 63 complete years from 1914 to 2019, the station's annual mean temperature rose at a fitted 1.1°F per century (+0.06°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Bloomfield's climate compare?
Bloomfield is warmer than 125 of the other 131 places with their own NOAA record in Iowa, and wetter than 113. Across the 7,247 U.S. stations with normals, its annual mean of 51.2°F is warmer than 46%.
In the Köppen classification computed from these normals, Bloomfield 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 Bloomfield 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.
- Lancaster, MO679 people · 16 mi SW
- Queen City, MO558 people · 24 mi S
- Downing, MO306 people · 18 mi S
- Glenwood, MO182 people · 17 mi SW
- Drakesville, IA170 people · 5 mi NW
- Floris, IA119 people · 10 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.
Questions about Bloomfield's climate
What is the coldest month in Bloomfield?
January, with a normal high of 32°F and a normal low of 15°F. The warmest is July (86°F by day, 66°F at night).
Does it snow in Bloomfield?
Yes: 24 inches in a normal year, falling on 15 days with 0.1 inch or more, the most in January (7.4 inches).
What is the rainiest month in Bloomfield?
May, with 5.51 in of precipitation in a normal year; the driest is January with 1.23 in.
What plant hardiness zone is Bloomfield in?
The USDA's 2023 map puts Bloomfield in zone 5b in ZIP code 52537, the nearest ZIP area. By the same method at Bloomfield's NOAA station, the coldest night of a typical year reaches −10°F (23 years, 1991-2020): zone 5b.
How late can frost come in Bloomfield?
In half of years the last 32°F night comes after April 16; in one year in ten it comes after April 30. Waiting until April 30 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Iowa climateThe statewide normals and every place in the state
- Memphis, MO23 miles from this station, 50.6°F a year
- Keosauqua, IA23 miles from this station, 50.6°F a year
- Centerville, IA25 miles from this station, 49.9°F a year
- Ottumwa, IA25 miles from this station, 50.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made