Climate at a Glance | Statewide Rankings | National Centers for Environmental Information (NCEI)

Statewide Rankings

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Please note, Degree Days and Palmer Indices are not available for Alaska or Hawaii. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Illinois

August 1930 Precipitation Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
August 1930 1-Month	1.96in (49.78mm)	3.50in (88.90mm)	-1.54in	15th Driest	Driest since: 1922	1897, 1953
August 1930 1-Month	1.96in (49.78mm)	3.50in (88.90mm)	-1.54in	116th Wettest	Wettest since: 1929	1977
Jul–Aug 1930 2-Month	2.93in (74.42mm)	7.13in (181.10mm)	-4.20in	1st Driest	Driest to Date	1930
Jul–Aug 1930 2-Month	2.93in (74.42mm)	7.13in (181.10mm)	-4.20in	130th Wettest	Wettest since: 1929	2016
Jun–Aug 1930 3-Month	6.34in (161.04mm)	11.22in (284.99mm)	-4.88in	3rd Driest	Driest to Date	1936
Jun–Aug 1930 3-Month	6.34in (161.04mm)	11.22in (284.99mm)	-4.88in	128th Wettest	Wettest since: 1929	1993
May–Aug 1930 4-Month	8.18in (207.77mm)	15.30in (388.62mm)	-7.12in	3rd Driest	Driest to Date	1936
May–Aug 1930 4-Month	8.18in (207.77mm)	15.30in (388.62mm)	-7.12in	128th Wettest	Wettest since: 1929	1915
Apr–Aug 1930 5-Month	10.92in (277.37mm)	19.01in (482.85mm)	-8.09in	3rd Driest	Driest to Date	1988
Apr–Aug 1930 5-Month	10.92in (277.37mm)	19.01in (482.85mm)	-8.09in	128th Wettest	Wettest since: 1929	1981
Mar–Aug 1930 6-Month	12.45in (316.23mm)	22.10in (561.34mm)	-9.65in	2nd Driest	Driest to Date	1936
Mar–Aug 1930 6-Month	12.45in (316.23mm)	22.10in (561.34mm)	-9.65in	129th Wettest	Wettest since: 1929	2009
Feb–Aug 1930 7-Month	14.38in (365.25mm)	23.96in (608.58mm)	-9.58in	2nd Driest	Driest to Date	1936
Feb–Aug 1930 7-Month	14.38in (365.25mm)	23.96in (608.58mm)	-9.58in	129th Wettest	Wettest since: 1929	2009
Jan–Aug 1930 8-Month	18.88in (479.55mm)	26.09in (662.69mm)	-7.21in	7th Driest	Driest since: 1914	1936
	18.88in (479.55mm)	26.09in (662.69mm)	-7.21in	124th Wettest	Wettest since: 1929	2019
	Ties: 1895
Dec 1929–Aug 1930 9-Month	21.12in (536.45mm)	28.41in (721.61mm)	-7.29in	6th Driest	Driest since: 1914	1936
Dec 1929–Aug 1930 9-Month	21.12in (536.45mm)	28.41in (721.61mm)	-7.29in	124th Wettest	Wettest since: 1929	2019
Nov 1929–Aug 1930 10-Month	22.88in (581.15mm)	31.17in (791.72mm)	-8.29in	5th Driest	Driest since: 1914	1934
Nov 1929–Aug 1930 10-Month	22.88in (581.15mm)	31.17in (791.72mm)	-8.29in	125th Wettest	Wettest since: 1929	1993
Oct 1929–Aug 1930 11-Month	26.39in (670.31mm)	33.96in (862.58mm)	-7.57in	7th Driest	Driest since: 1925	1934
Oct 1929–Aug 1930 11-Month	26.39in (670.31mm)	33.96in (862.58mm)	-7.57in	123rd Wettest	Wettest since: 1929	1993
Sep 1929–Aug 1930 12-Month	29.10in (739.14mm)	37.45in (951.23mm)	-8.35in	7th Driest	Driest since: 1925	1934
Sep 1929–Aug 1930 12-Month	29.10in (739.14mm)	37.45in (951.23mm)	-8.35in	123rd Wettest	Wettest since: 1929	1927
Mar 1929–Aug 1930 18-Month	55.59in (1,411.99mm)	59.51in	-3.92in	29th Driest	Driest since: 1926	1931
Mar 1929–Aug 1930 18-Month	55.59in (1,411.99mm)	59.51in	-3.92in	101st Wettest	Wettest since: 1929	2010
Sep 1928–Aug 1930 24-Month	72.80in (1,849.12mm)	74.89in	-2.09in	44th Driest	Driest since: 1926	1941
Sep 1928–Aug 1930 24-Month	72.80in (1,849.12mm)	74.89in	-2.09in	85th Wettest	Wettest since: 1929	2010
Sep 1927–Aug 1930 36-Month	114.17in (2,899.92mm)	112.30in	1.87in	66th Driest	Driest since: 1926	1941
Sep 1927–Aug 1930 36-Month	114.17in (2,899.92mm)	112.30in	1.87in	62nd Wettest	Wettest since: 1929	2010
Sep 1926–Aug 1930 48-Month	165.30in (4,198.62mm)	149.71in	15.59in	105th Driest	Driest since: 1928	1956
Sep 1926–Aug 1930 48-Month	165.30in (4,198.62mm)	149.71in	15.59in	22nd Wettest	Wettest since: 1929	2011
Sep 1925–Aug 1930 60-Month	202.68in (5,148.07mm)	187.12in	15.56in	101st Driest	Driest since: 1929	1934
Sep 1925–Aug 1930 60-Month	202.68in (5,148.07mm)	187.12in	15.56in	25th Wettest	Wettest to Date	2011

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published March 2025, retrieved on April 2, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings

Climate at a Glance Statewide Rankings

Statewide Rankings

Illinois

August 1930 Precipitation Rankings

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