ROCKFORD, ILLINOIS

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Elevation: 220 meters Latitude: 42 12N Longitude: 089 06W

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MONTHLY - ALL WEATHER AVERAGES [ Show Summary ]

[ °F ] °C

TEMPERATURE

Average Temperature

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		9.6		-5.4		-3.6		2.1		9.2		15.4		20.8		23.6		22.4		18.2		11.6		3.7		-3.1

Average High Temperature

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		15.4		-0.6		1.2		7.4		15.4		22.1		27.3		30.3		29		24.8		17.9		8.6		1.2

Average Low Temperature

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		3.8		-10.2		-8.4		-3.2		3.1		8.9		14.4		16.9		15.8		11.6		5.2		-1.2		-7.3

Highest Recorded Temperature

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		44.4		16.1		19.4		27.8		33.9		41.1		41.1		44.4		40		39.4		32.8		27.2		17.8

Lowest Recorded Temperature

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-31.7		-31.7		-31.7		-22.8		-10		-2.8		1.7		6.1		1.7		-4.4		-13.9		-22.2		-30.6

Average Number of Days Above 90F/32C

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		27.5		---		---		---		0.1		1.2		5.1		10.6		7.3		3.1		0.1		---		---

Average Number of Days Above 65F/18C

Years on Record: 41

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		165		---		---		2		9		23		29		31		31		26		13		2		---

Average Number of Days Below 32F/0C

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		142.9		29.3		26.2		23.4		9.7		1.2		---		---		---		0.5		6.3		18.6		27.7

Average Number of Days Below 5F/-15C

Years on Record: 41

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		26		12		7		1		---		---		---		---		---		---		---		---		6

Average Number of Days Below 0F/-17C

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		12.9		5.6		3.6		0.5		---		---		---		---		---		---		---		0.2		3

PRECIPITATION

Average Precipitation

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		884		47		40		66		78		97		104		94		96		97		65		58		42

Average Number of Days With Precipitation

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		97		7		6		8		10		11		10		8		8		8		7		7		7

Most Reported Precipitation in a Month

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		395		147		84		158		181		226		270		395		272		261		166		200		99

Least Reported Precipitation in a Month

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1		3		1		7		7		17		9		1		5		9		5		2		4

Most Precipitation Reported in a Day

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		213.6		50.8		33.8		51		64.3		70.6		118.6		213.6		114.3		138.4		111.2		68.6		59.2

Avg. No. of Days w/Precip. Above 0.2in/5mm

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		67		4		4		6		7		8		6		6		6		6		5		5		4

Avg. # of Days w/Precip. Above 0.4in/10mm

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		24		1		1		2		2		3		3		2		3		3		2		1		1

Avg. No. of Days w/Precip. Above 1in/25mm

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		8		---		---		1		1		1		1		1		1		1		1		---		---

PRECIPITATION - RAIN

Average Number of Rainy Days

Years on Record: 43

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		118		9		8		11		12		11		10		10		9		9		9		9		10

Average Number of Days With Thunderstorms

Years on Record: 41

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		41		---		---		2		4		5		8		8		6		5		2		1		---

Most Rain Reported in a Month

Years on Record: 41

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1430		110		70		140		250		170		290		290		340		270		210		130		120

Least Recorded Rainfall

Years on Record: 41

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		590		---		---		10		20		10		10		20		10		---		---		10		10

PRECIPITATION - SNOW

Average Snowfall

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		82		23.4		16.5		15.5		2.5		---		---		---		---		---		0.5		7.1		16.5

Most Snow Reported in a Month

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		91.7		91.7		55.4		54.6		22.9		3.8		---		---		---		---		12.7		47		67.3

HUMIDITY

Average Morning Relative Humidity

Years on Record: 41

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		84		80		81		82		80		80		81		86		90		90		86		83		83

Average Evening Relative Humidity

Years on Record: 41

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		58		69		64		60		51		50		51		53		56		54		53		63		70

Average Dew Point

Years on Record: 41

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		3		-10		-8		-3		2		8		13		16		16		11		5		-1		-7

DEGREE DAYS

Heating Degree Days

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2397.2		563.3		462.8		334.4		135.6		31.1		1.7		---		---		11.1		87.8		278.3		491.1

Cooling Degree Days

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		497.8		---		---		---		3.9		30		98.3		166.1		133.3		58.9		7.2		---		---

Growing Degree Days

Years on Record: 65

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1596.4		---		---		---		---		168.8		325		421.9		384.1		246.7		49.9		---		---

VISIBILITY

Average Number of Days With Fog

Years on Record: 41

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		146		12		11		12		11		11		8		12		16		14		12		13		14

Average Number of Clear Days

Years on Record: 43

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		93		7		7		6		6		8		7		9		9		10		10		6		7

Average Number of Cloudy Days

Years on Record: 43

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		174		17		15		17		16		14		12		10		11		11		13		18		18

Average Number of Partly Cloudy Days

Years on Record: 43

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		98		7		6		8		8		9		11		12		11		9		8		6		6

WIND

Average Wind Speed

Years on Record: 41

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
km/h		16		19		19		19		19		16		14		12		12		12		14		16		19

NEARBY - MAP

NEARBY - LIST

Cherry Valley, Illinois (0 mi / 1 km)
Belvidere, Illinois (9 mi / 14 km)
Rochelle, Illinois (19 mi / 31 km)
South Beloit, Illinois (21 mi / 34 km)
Browns Mill, Illinois (26 mi / 42 km)

GEOBA.SE

Rockford, Illinois

WEATHER FORECAST