Weather on December 17

Rockford, IL

55 Years of Data

Avg High
30°F
Avg Low
17°F
Warmest
1977
44°F avg
Coldest
1985
1°F avg

About This Date

December 17th in Rockford, IL typically brings very cold winter weather, with average highs around 30°F and lows near 17°F. Over 55 years of records, the warmest December 17th was in 1977 (44°F average), while the coldest was 1985 (1°F) — a 43°F range across recorded history. Precipitation has occurred on 27% of recorded December 17th dates, with snow falling 18% of the time (heaviest snowfall: 2"). The last decade has been 7.0°F warmer on this date compared to 20-30 years ago.

The last decade has been 7.0°F warmer on this date compared to 20-30 years ago.

Planning for December 17th in Rockford, IL? Bundle up with warm layers and protect extremities from the cold.

Warming Trend
2.3°F per decade on this date
YearHighLowAvgPrecipSnow
202539°27°33°
202439°32°36°
202343°33°38°
202224°19°22°0.03"0.1"
202139°19°29°
202038°21°30°
201928°18°23°
201841°23°32°
201740°27°34°0.03"
201620°13°17°0.33"2"
201534°26°30°
201426°23°25°
201334°16°25°0.03"0.1"
201237°30°34°
201131°23°27°0.23"1.6"
201017°13°
200930°13°21°
200818°11°0.03"
200723°14°19°
200650°35°43°
200517°12°
200432°15°24°
200323°19°21°
200237°29°33°
200144°29°36°
200012°-4°
199924°16°0.36"1.4"
199838°23°30°
199740°15°27°
199627°15°21°
199535°19°27°
199438°30°34°
199340°34°37°0.2"
199230°21°26°
199136°20°28°
199036°32°34°0.53"
198917°10°
198822°15°0.03"0.1"
198723°15°
198637°29°33°
1985coldest-7°0.13"0.5"
198434°22°28°
19830.03"0.2"
198230°17°
198121°14°
198036°23°29°
197917°-5°
197832°15°24°
1977warmest50°37°44°0.13"
197637°18°27°
197511°
197428°17°23°0.08"0.3"
197323°-2°11°
197227°-9°
197128°18°0.03"0.2"
55 years of data from ROCKFORD GTR ROCKFORD AP

Browse Weather History

Weather data provided by NOAA Climate Data Online. Not for critical planning.