Brookport, Illinois climate: Normal weather by month, frost dates and records
Brookport's normal year runs from 25°F January nights to 89°F July afternoons, with 49.1 inches of precipitation and 3 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.1°C, January lows of −4°C, July highs of 31°C, 1,247 mm of precipitation a year.
- NOAA stationBrookport Dam 52
- Station IDUSC00110993
- Location37.13°N 88.65°W
- Elevation330 ft (101 m)
- Population691
On October 14, the normal high in Brookport is 72°F and the normal low 48°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 Brookport.
- Jan 43° 25°
- Feb 48° 28°
- Mar 58° 36°
- Apr 69° 46°
- May 77° 56°
- Jun 85° 65°
- Jul 89° 68°
- Aug 88° 66°
- Sep 82° 59°
- Oct 71° 47°
- Nov 57° 36°
- Dec 47° 29°
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 Brookport each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 25°F. The most precipitation falls in April (5.10 in), the least in August (2.93 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 43°F | 25°F | 34.1°F | 3.72 | 0.7 | 9 | <1 | 23 | 9 h 50 min |
| February | 48°F | 28°F | 37.8°F | 3.79 | 1.8 | 8 | <1 | 18 | 10 h 50 min |
| March | 58°F | 36°F | 46.9°F | 4.63 | 0.1 | 10 | <1 | 11 | 11 h 50 min |
| April | 69°F | 46°F | 57.6°F | 5.10 | 0.0 | 11 | <1 | 2 | 13 h 10 min |
| May | 77°F | 56°F | 66.7°F | 4.83 | 0.0 | 11 | 1 | <1 | 14 h 10 min |
| June | 85°F | 65°F | 75.0°F | 4.67 | 0.0 | 8 | 8 | <1 | 14 h 40 min |
| July | 89°F | 68°F | 78.4°F | 3.85 | 0.0 | 8 | 15 | <1 | 14 h 30 min |
| August | 88°F | 66°F | 77.2°F | 2.93 | 0.0 | 6 | 13 | <1 | 13 h 40 min |
| September | 82°F | 59°F | 70.3°F | 3.49 | 0.0 | 7 | 5 | <1 | 12 h 30 min |
| October | 71°F | 47°F | 58.8°F | 4.08 | 0.0 | 7 | <1 | 1 | 11 h 20 min |
| November | 57°F | 36°F | 46.6°F | 3.97 | 0.0 | 8 | <1 | 10 | 10 h 10 min |
| December | 47°F | 29°F | 37.9°F | 4.05 | 0.5 | 10 | <1 | 18 | 9 h 40 min |
| Year (annual) | 68°F | 47°F | 57.3°F | 49.11 | 3.1 | 103 | 42 | 83 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −4°C | 1.2°C | 94 mm | 2 cm |
| February | 9°C | −2°C | 3.2°C | 96 mm | 5 cm |
| March | 14°C | 2°C | 8.3°C | 118 mm | 0 cm |
| April | 21°C | 8°C | 14.2°C | 130 mm | 0 cm |
| May | 25°C | 13°C | 19.3°C | 123 mm | 0 cm |
| June | 30°C | 18°C | 23.9°C | 119 mm | 0 cm |
| July | 31°C | 20°C | 25.8°C | 98 mm | 0 cm |
| August | 31°C | 19°C | 25.1°C | 74 mm | 0 cm |
| September | 28°C | 15°C | 21.3°C | 89 mm | 0 cm |
| October | 22°C | 8°C | 14.9°C | 104 mm | 0 cm |
| November | 14°C | 2°C | 8.1°C | 101 mm | 0 cm |
| December | 8°C | −2°C | 3.3°C | 103 mm | 1 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00110993; 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 Brookport?
Normal highs sit between 65°F and 85°F in April, May, 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 USC00110993.
When is the last frost in Brookport?
In Brookport, the last spring frost (32°F) comes after April 6 in half of years and after April 23 in one year in ten; the first autumn frost comes before October 27 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 61 year in 10 after April 23; 9 in 10 after March 21
- First autumn frost, half of years before
- October 271 year in 10 before October 15; 9 in 10 before November 9
NOAA puts the median frost-free season at 203 days, and the season without a hard freeze (28°F) at 223 days.
A hard freeze (28°F) comes after March 27 in half of springs and before November 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Brookport in zone 7a in ZIP code 62910, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Brookport's NOAA station is in zone 7a: the coldest night of a typical year reaches 3°F (16 complete years).
Frost dates for every NOAA station in Illinois · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00110993; 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 Brookport?
In a normal year in Brookport, 42 days a year reach 90°F (1 of them 100°F or more), 83 nights fall to 32°F or colder and 103 days bring measurable precipitation.
- Days at 90°F or more
- 42a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 83a normal year
- Days that stay below freezing
- 13high of 32°F or less
- Days with 0.01 inch of precipitation
- 103a normal year
- Days with 1 inch of snow or more
- 2a normal year
The highest temperature in this station's record (since 1962) is 105°F, on June 30, 2012; the lowest is −21°F, on January 21, 1984.
The wettest calendar year on that record is 1973, with 65.14 in; the snowiest season is 1984–85, with 35.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00110993; records: ACIS (NOAA Regional Climate Centers), station USC00110993. Records use complete months only; a month missing more than three days is left out.
How sunny is Brookport?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Brookport, 4.2 kWh per square metre a day. August is the sunniest month (83%) and December the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 2.1 |
| February | 64% | 2.8 |
| March | 67% | 3.8 |
| April | 73% | 5.1 |
| May | 74% | 5.7 |
| June | 82% | 6.5 |
| July | 83% | 6.3 |
| August | 83% | 5.7 |
| September | 81% | 4.8 |
| October | 76% | 3.5 |
| November | 72% | 2.5 |
| December | 64% | 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 Brookport need?
A normal year in Brookport brings 4,267 heating degree days, 21% fewer than the median U.S. place (5,373), and 1,481 cooling degree days, 63% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,362 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 959 | 0 |
| February | 763 | 0 |
| March | 565 | 4 |
| April | 249 | 27 |
| May | 70 | 122 |
| June | 4 | 302 |
| July | 0 | 415 |
| August | 1 | 379 |
| September | 31 | 190 |
| October | 230 | 39 |
| November | 554 | 2 |
| December | 842 | 0 |
| Year (annual) | 4,267 | 1,481 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00110993. 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 Brookport's climate compare?
Brookport is warmer than 139 of the other 143 places with their own NOAA record in Illinois, and wetter than 133. Across the 7,247 U.S. stations with normals, its annual mean of 57.3°F is warmer than 67%.
In the Köppen classification computed from these normals, Brookport is Cfa: temperate, 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 Brookport share this climate record?
9 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.
- Mayfield, KY9,805 people · 27 mi S
- Massac, KY4,937 people · 7 mi S
- Reidland, KY4,887 people · 11 mi SE
- Hendron, KY4,840 people · 7 mi S
- Farley, KY4,402 people · 8 mi SE
- Symsonia, KY386 people · 16 mi SE
- Lowes, KY126 people · 18 mi S
- Hickory, KY53 people · 21 mi S
- Lovelaceville, KY12 people · 15 mi SW
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 Brookport's climate
What is the coldest month in Brookport?
January, with a normal high of 43°F and a normal low of 25°F. The warmest is July (89°F by day, 68°F at night).
Does it snow in Brookport?
Yes: 3 inches in a normal year, falling on 2 days with 0.1 inch or more, the most in February (1.8 inches).
What is the rainiest month in Brookport?
April, with 5.10 in of precipitation in a normal year; the driest is August with 2.93 in.
What plant hardiness zone is Brookport in?
The USDA's 2023 map puts Brookport in zone 7a in ZIP code 62910, the nearest ZIP area. By the same method at Brookport's NOAA station, the coldest night of a typical year reaches 3°F (16 years, 1991-2020): zone 7a.
How late can frost come in Brookport?
In half of years the last 32°F night comes after April 6; in one year in ten it comes after April 23. Waiting until April 23 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Illinois climateThe statewide normals and every place in the state
- Paducah, KY7 miles from this station, 58.8°F a year
- Smithland Lock and Dam, IL12 miles from this station, 57.1°F a year
- Dixon Springs Agricultural Center, IL22 miles from this station, 57.2°F a year
- Grand Chain Dam 53, IL22 miles from this station, 57.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made