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Shaded-relief map of Big Foot Prairie, Illinois: rivers, roads, the city limits and where the water drains.
ILLINOIS · MCHENRY COUNTY

Big Foot Prairie

65 people, 960 ft above sea level in McHenry County.

960 ftElevation, city center
65People, 2024 estimate
0 sq miLand area
Clear 37°
Clear now Dew point 27° · NW 5 mph · high 36°
City of Big Foot Prairie River Interstate 2 miles
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The Big Foot Prairie plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in Big Foot Prairie

NWS forecast and National Blend of Models · updated 5:00 PM CST
RIGHT NOW Janesville-Rock County (KJVL) · 4:45 PM
Clear
37° Clear Feels like 34° · high of 36° near 5 PM
WindNW 5 mphno gusts
Humidity65%rising to 96% by morning
Pressure30.28 in →steady
Visibility10 mihaze-free
CloudsClear
UV index—no forecast
Dew point 27° · Dryabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Showers
Friday40% chance · showers
LIKELY AMOUNT—amounts come within 3 days
LAST RAINNov. 60.01 in · 8 dry days
ALERTS & OUTLOOKS
No watches or warnings for McHenry County
NWS Chicago and the Storm Prediction Center · checked 5:45 PM
SUN & MOON
↑ 6:44 AM4:33 PM ↓
9 h 49 m of daylight, 2 minutes less than yesterday
Waxing crescent, 26% lit. Next full moon: Nov. 24.
AIR & POLLEN
19
GOODAir quality index · fine particles
Tomorrow: None, good. No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
SATURDAY, NOV. 14
SUNDAY, NOV. 15
MONDAY, NOV. 16
TUESDAY, NOV. 17
5p
8p
11p
2a
5a
8a
11a
2p
5p
8p
11p
2a
5a
8a
11a
2p
5p
8p
11p
2a
5a
8a
11a
2p
clear night
clear night
mostly clear night
mostly clear night
mostly clear night
mostly sunny
clear day
clear day
clear night
clear night
mostly clear night
mostly clear night
mostly clear night
clear day
mostly sunny
partly cloudy day
mostly clear night
clear night
clear night
mostly clear night
mostly clear night
mostly sunny
clear day
mostly sunny
TEMPERATURE °F
36°
25°
47°
25°
49°
32°
CHANCE OF RAIN
50%
WIND, MPH
3
0
0
0
0
0
0
0
0
0
0
0
0
5
10
10
8
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12
HOW IT FEELS · DEW POINT
Dry: dew points 23 to 34°

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 47° / 29°
SAT Nov. 14 Sunny Sunny
36° 23°
0% rain — NNW 1 A
SUN Nov. 15 Mostly sunny; warmer Mostly sunny; warmer
49° 24°
0% rain — NW 0 A
MON Nov. 16 Mostly sunny Mostly sunny
52° 30°
0% rain — SW 8 A
TUE Nov. 17 Mostly sunny Mostly sunny
55° 34°
0% rain — S 10 A
WED Nov. 18 Partly cloudy Partly cloudy
56° 43°
10% rain — S 14 B
THU Nov. 19 Mostly sunny Mostly sunny
59° 41°
20% rain — WSW 8 C
FRI Nov. 20 Chance of showers Chance of showers
59° 47°
40% rain up to 0.08″ SSE 10 C
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over Big Foot Prairie about 5,000 feet above the ground was over the open Pacific three days ago, and over the northern Plains a day ago, about 3,010 miles back along its path. It came down from about 12,200 feet up, warming and drying as it sank. Near the ground the air came from British Columbia; at 10,000 feet, from the northern Rockies. It feels dry all the same. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

THIS WEEK, FOUR YEARS AGO Nov. 11, 2022

The hottest this week has been

75° on Nov. 11, 2022, the hottest reading for this week of the year since 1945. Next is 71° in 1964.

71°
75°
19642022
Source: NOAA RCC-ACIS, the Lake Geneva Wwtp record since 1945.
MILE2
THE GROUND

What Big Foot Prairie stands on

Big Foot Prairie’s center stands about 960 ft above sea level. Within three miles the land runs from 900 ft to 1,170 ft, a difference of 270 ft: rolling country.

Under the town center the state geologic map shows Silurian System undivided (dolostone, limestone), from the Silurian, 422 to 445 million years old.

The section below crosses 3 rock units mapped at the surface.

Big Foot Prairie, cut in half from west to east

A section west to east, 24 miles through the town center
900 ft1,000 ft1,100 ft BIG FOOT PRAIRIE960 ftSharon990 ftBloomfield900 ft ← WBloomfield · E →

Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 62×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.

Rock at the surface along the line

Galena Group (Trenton Limestone)

Dolostone, limestone. Age: Late Ordovician, 447 to 459 million years old. About 10 mi of the line.

Silurian System undivided

Dolostone, limestone. Age: Silurian, 422 to 445 million years old. About 7 mi of the line.

Maquoketa Formation or Group

Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 7 mi of the line.

From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.

Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.

MILE3
THE WATER

Where Big Foot Prairie’s rain goes

A raindrop that lands in Big Foot Prairie reaches the Gulf of America by way of Lawrence Creek, Piscasaw Creek, the Kishwaukee, the Rock River and the Mississippi: about 1,640 river miles.

THE WAY DOWN, TO SCALE
Big Foot Prairie≈ 1,640 mi · the Gulf of America
FROM THE CENTER OF BIG FOOT PRAIRIE ≈ 1,640 mi to the Gulf of America Lawrence Creek → Piscasaw Creek → Kishwaukee → Rock River → Mississippi

Traced down the USGS NHDPlus V2.1 river network from the Census center point of Big Foot Prairie; river miles along the main stem, rounded.

MILE5
THE ALMANAC

Big Foot Prairie’s year

1991–2020 normals · records since 1945 · Lake Geneva Wwtp, 12 mi northeast

Big Foot Prairie has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 15° in January. A normal year brings about 40 inches of snow; with the rain, that comes to about 37 inches of water.

30°15°35°17°45°26°59°37°72°48°81°58°86°63°83°61°76°54°63°42°47°31°35°21° JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 123 TODAY 36.9 in rain and snowmelt
Normal high to low, by month Record high to low, by day Rain by month Freezing
July, average86° / 63°high / low, the warmest month
January, average30° / 15°high / low, the coldest month
Rain and melted snow36.9 inwettest months: June and May
Snow a year40.1 insnowiest: January
Hottest on record106°FAugust 1, 1988
Coldest on record−27°FJanuary 18, 1994
Wettest day on record4.96 inSeptember 12, 2022
Snowiest day on record13.2 inJanuary 26, 1978
Climate typeHot-summer humid continentalKöppen Dfa

AROUND THE RING

1Highs below freezingDec. 26 to Feb. 8; normal highs stay below 32°
2Lows below freezingNov. 12 to April 3; normal lows fall below 32°
3Wettest stretchMay through July: 12.7 of the year’s 36.9 inches
NOVEMBER 14 IN THE RECORD

On November 14 Big Foot Prairie normally reaches 48° and falls to 31°. The record high is 70°, in 1971; the record low 8°, in 1959. The most rain on this date, 1.13 in, fell in 1957.

MONTH BY MONTH
JanFebMarAprMayJunJulAugSepOctNovDec
Normal high30°35°45°59°72°81°86°83°76°63°47°35°
Normal low15°17°26°37°48°58°63°61°54°42°31°21°
Rain and melt, in1.901.892.293.454.124.813.723.323.653.012.482.31
Snow, inches13.98.14.82.60.00.00.00.00.00.23.47.1
Record high59° (1997)74° (2024)81° (1986)90° (1980)94° (1991)104° (1988)104° (1995)106° (1988)100° (1953)87° (2025)75° (2022)67° (2001)
Record low−27° (1994)−25° (1996)−15° (1962)9° (1982)26° (1947)34° (1945)39° (1965)40° (1986)28° (1995)17° (1988)−6° (1950)−23° (1983)

Normals 1991–2020 and records since 1945 at Lake Geneva Wwtp, 12 miles northeast, 110 ft lower. NOAA, through RCC-ACIS.

MILE7
ON THE NETWORK

Around Big Foot Prairie on the Forecast Network

Neighboring plates

Rockford IL · 29 MI 29 miles southwest Elgin IL · 34 MI 34 miles southeast Milwaukee WI · 51 MI 51 miles northeast Madison WI · 59 MI 59 miles northwest Chicago IL · 65 MI 65 miles southeast Grand Rapids MI · 153 MI 153 miles east
FORECASTCITY
Map of Big Foot Prairie, Illinois. Explore the plate
ILLINOIS · MCHENRY

Big Foot Prairie

65 people, 960 ft above sea level in McHenry County.

960 ftElevation
65People
0 sq miLand
Clear 37°
ClearDew point 27°
1

Today in Big Foot Prairie

NEXT 15 HOURS
Now clear night 36° 0%
8p clear night 32° 0%
11p mostly clear night 29° 0%
2a mostly clear night 27° 0%
5a mostly clear night 25° 0%
8a mostly sunny 29° 0%
Showers
NEXT RAINFriday · 40%
→
Sat0%
Sunny Sunny
23
36
A
Sun0%
Mostly sunny; warmer Mostly sunny; warmer
24
49
A
Mon0%
Mostly sunny Mostly sunny
30
52
A
Tue0%
Mostly sunny Mostly sunny
34
55
A
Wed10%
Partly cloudy Partly cloudy
43
56
B
Thu20%
Mostly sunny Mostly sunny
41
59
C
Fri40%
Chance of showers Chance of showers
47
59
C
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
THIS WEEK, FOUR YEARS AGO · NOV. 11, 2022

75°, the hottest this week of the year has been since 1945.

2

What Big Foot Prairie stands on

Big Foot Prairie’s center stands about 960 ft above sea level. Within three miles the land runs from 900 ft to 1,170 ft, a difference of 270 ft: rolling country.

Big Foot Prairie, west to east Big Foot Prairie960 ft ← WE → 24 miles through the town center; vertical exaggeration about 117×. Colors: rock at the surface.
Elevation, center960 ft
Within 3 miles900 to 1,170 ft
Lie of the landRolling (270 ft of relief)
Rock at the surfaceSilurian System undivided
Its ageSilurian, 422 to 445 million years old
5

Big Foot Prairie’s year

Big Foot Prairie has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 15° in January. A normal year brings about 40 inches of snow; with the rain, that comes to about 37 inches of water.

JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 123 36.9 in
July, average86° / 63° · high / low, the warmest month
January, average30° / 15° · high / low, the coldest month
Rain and melted snow36.9 in · wettest months: June and May
Snow a year40.1 in · snowiest: January
Hottest on record106°F · August 1, 1988
Coldest on record−27°F · January 18, 1994
Wettest day on record4.96 in · September 12, 2022
Snowiest day on record13.2 in · January 26, 1978
Climate typeHot-summer humid continental · Köppen Dfa
1Highs below freezing · Dec. 26 to Feb. 8; normal highs stay below 32°
2Lows below freezing · Nov. 12 to April 3; normal lows fall below 32°
3Wettest stretch · May through July: 12.7 of the year’s 36.9 inches
NOVEMBER 14 IN THE RECORD

On November 14 Big Foot Prairie normally reaches 48° and falls to 31°. The record high is 70°, in 1971; the record low 8°, in 1959. The most rain on this date, 1.13 in, fell in 1957.

Normals 1991–2020 and records since 1945 at Lake Geneva Wwtp, 12 miles northeast, 110 ft lower. NOAA, through RCC-ACIS.
3

Where the rain goes

≈ 1,640 mito the Gulf of AmericaLawrence Creek → Piscasaw Creek → Kishwaukee → Rock River → Mississippi

A raindrop that lands in Big Foot Prairie reaches the Gulf of America by way of Lawrence Creek, Piscasaw Creek, the Kishwaukee, the Rock River and the Mississippi: about 1,640 river miles.