Brunswick, Missouri climate: Normal weather by month, frost dates and records
Brunswick's normal year runs from 20°F January nights to 87°F July afternoons, with 40.4 inches of precipitation and 12 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.3°C, January lows of −7°C, July highs of 30°C, 1,027 mm of precipitation a year.
- NOAA stationBrunswick
- Station IDUSC00231037
- Location39.42°N 93.13°W
- Elevation662 ft (202 m)
- Population796
On October 12, the normal high in Brunswick is 69°F and the normal low 47°F, and the chance of measurable rain or snow is 24%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Brunswick.
- Jan 36° 20°
- Feb 41° 23°
- Mar 53° 33°
- Apr 65° 44°
- May 74° 55°
- Jun 83° 65°
- Jul 87° 69°
- Aug 85° 67°
- Sep 79° 58°
- Oct 67° 46°
- Nov 53° 34°
- Dec 41° 24°
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 Brunswick each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 20°F. The most precipitation falls in June (5.55 in), the least in January (1.51 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 36°F | 20°F | 27.8°F | 1.51 | 4.0 | 5 | <1 | 29 | 9 h 40 min |
| February | 41°F | 23°F | 32.3°F | 2.03 | 4.9 | 5 | <1 | 23 | 10 h 40 min |
| March | 53°F | 33°F | 43.3°F | 2.77 | 1.1 | 7 | <1 | 18 | 11 h 50 min |
| April | 65°F | 44°F | 54.0°F | 3.96 | 0.0 | 10 | <1 | 5 | 13 h 10 min |
| May | 74°F | 55°F | 64.3°F | 5.45 | 0.0 | 11 | <1 | <1 | 14 h 20 min |
| June | 83°F | 65°F | 73.7°F | 5.55 | 0.0 | 10 | 5 | <1 | 15 h |
| July | 87°F | 69°F | 77.7°F | 4.30 | 0.0 | 9 | 10 | <1 | 14 h 40 min |
| August | 85°F | 67°F | 75.8°F | 3.85 | 0.0 | 7 | 8 | <1 | 13 h 50 min |
| September | 79°F | 58°F | 68.1°F | 3.49 | 0.0 | 7 | 3 | <1 | 12 h 30 min |
| October | 67°F | 46°F | 56.4°F | 3.35 | 0.0 | 7 | <1 | 3 | 11 h 10 min |
| November | 53°F | 34°F | 43.5°F | 2.36 | 0.1 | 6 | <1 | 15 | 10 h |
| December | 41°F | 24°F | 32.4°F | 1.80 | 2.1 | 5 | <1 | 26 | 9 h 20 min |
| Year (annual) | 64°F | 45°F | 54.1°F | 40.42 | 12.2 | 89 | 26 | 118 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −7°C | −2.3°C | 38 mm | 10 cm |
| February | 5°C | −5°C | 0.2°C | 52 mm | 12 cm |
| March | 12°C | 1°C | 6.3°C | 70 mm | 3 cm |
| April | 18°C | 6°C | 12.2°C | 101 mm | 0 cm |
| May | 23°C | 13°C | 17.9°C | 138 mm | 0 cm |
| June | 28°C | 18°C | 23.2°C | 141 mm | 0 cm |
| July | 30°C | 20°C | 25.4°C | 109 mm | 0 cm |
| August | 30°C | 19°C | 24.3°C | 98 mm | 0 cm |
| September | 26°C | 14°C | 20.1°C | 89 mm | 0 cm |
| October | 19°C | 8°C | 13.6°C | 85 mm | 0 cm |
| November | 12°C | 1°C | 6.4°C | 60 mm | 0 cm |
| December | 5°C | −4°C | 0.2°C | 46 mm | 5 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00231037; 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 Brunswick?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September has the fewest days with rain (7).
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 USC00231037.
When is the last frost in Brunswick?
In Brunswick, the last spring frost (32°F) comes after April 10 in half of years and after April 26 in one year in ten; the first autumn frost comes before October 29 in half of years and before October 15 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 101 year in 10 after April 26; 9 in 10 after March 24
- First autumn frost, half of years before
- October 291 year in 10 before October 15; 9 in 10 before November 11
NOAA puts the median frost-free season at 201 days, and the season without a hard freeze (28°F) at 223 days.
A hard freeze (28°F) comes after March 31 in half of springs and before November 7 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Brunswick in zone 6a in ZIP code 65236, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Brunswick's NOAA station is in zone 6a: the coldest night of a typical year reaches −5°F (19 complete years).
Frost dates for every NOAA station in Missouri · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00231037; 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 Brunswick?
In a normal year in Brunswick, 26 days a year reach 90°F (1 of them 100°F or more), 118 nights fall to 32°F or colder and 89 days bring measurable precipitation.
- Days at 90°F or more
- 26a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 118a normal year
- Days that stay below freezing
- 31high of 32°F or less
- Days with 0.01 inch of precipitation
- 89a normal year
- Days with 1 inch of snow or more
- 4a normal year
The highest temperature in this station's record (since 1890) is 114°F, on July 15, 1936; the lowest is −29°F, on February 13, 1905.
The wettest calendar year on that record is 1961, with 62.32 in; the snowiest season is 1925–26, with 59.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00231037; records: ACIS (NOAA Regional Climate Centers), station USC00231037. Records use complete months only; a month missing more than three days is left out.
How sunny is Brunswick?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Brunswick, 4.2 kWh per square metre a day. July is the sunniest month (83%) and January the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 2.1 |
| February | 70% | 2.9 |
| March | 68% | 3.8 |
| April | 71% | 5.0 |
| May | 73% | 5.7 |
| June | 80% | 6.4 |
| July | 83% | 6.5 |
| August | 81% | 5.6 |
| September | 82% | 4.8 |
| October | 75% | 3.3 |
| November | 73% | 2.4 |
| 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 Brunswick need?
A normal year in Brunswick brings 5,235 heating degree days, 3% fewer than the median U.S. place (5,373), and 1,311 cooling degree days, 44% more than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,937 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,153 | 0 |
| February | 914 | 0 |
| March | 675 | 4 |
| April | 348 | 18 |
| May | 118 | 95 |
| June | 10 | 272 |
| July | 1 | 396 |
| August | 3 | 339 |
| September | 62 | 156 |
| October | 295 | 29 |
| November | 647 | 2 |
| December | 1,010 | 0 |
| Year (annual) | 5,235 | 1,311 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00231037. 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 Brunswick's climate compare?
Brunswick is warmer than 43 of the other 133 places with their own NOAA record in Missouri, and wetter than 27. Across the 7,247 U.S. stations with normals, its annual mean of 54.1°F is warmer than 57%.
In the Köppen classification computed from these normals, Brunswick 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 Brunswick 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.
- Hale, MO373 people · 17 mi NW
- Mendon, MO164 people · 11 mi N
- Miami, MO150 people · 9 mi SW
- De Witt, MO82 people · 5 mi SW
- Triplett, MO36 people · 6 mi NW
- Dalton, MO6 people · 8 mi E
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 Brunswick's climate
What is the coldest month in Brunswick?
January, with a normal high of 36°F and a normal low of 20°F. The warmest is July (87°F by day, 69°F at night).
Does it snow in Brunswick?
Yes: 12 inches in a normal year, falling on 7 days with 0.1 inch or more, the most in February (4.9 inches).
What is the rainiest month in Brunswick?
June, with 5.55 in of precipitation in a normal year; the driest is January with 1.51 in.
What plant hardiness zone is Brunswick in?
The USDA's 2023 map puts Brunswick in zone 6a in ZIP code 65236, the nearest ZIP area. By the same method at Brunswick's NOAA station, the coldest night of a typical year reaches −5°F (19 years, 1991-2020): zone 6a.
How late can frost come in Brunswick?
In half of years the last 32°F night comes after April 10; in one year in ten it comes after April 26. Waiting until April 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Missouri climateThe statewide normals and every place in the state
- Salisbury, MO17 miles from this station, 54.0°F a year
- Carrollton, MO19 miles from this station, 53.7°F a year
- Marshall, MO21 miles from this station, 54.0°F a year
- Brookfield, MO24 miles from this station, 53.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made