Statewide Rankings

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

Colorado

Precipitation Rankings, September 1991

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Record Driest
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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Wettest/Driest Since	Record
September 1991 1-Month	1.36" (34.54mm)	1.43" (36.32mm)	-0.07" (-1.78mm)	70th Driest	Driest since: 1987	1956
September 1991 1-Month	1.36" (34.54mm)	1.43" (36.32mm)	-0.07" (-1.78mm)	59th Wettest	Wettest since: 1990	2013
Aug–Sep 1991 2-Month	3.80" (96.52mm)	3.46" (87.88mm)	0.34" (8.64mm)	88th Driest	Driest since: 1989	1944
	3.80" (96.52mm)	3.46" (87.88mm)	0.34" (8.64mm)	41st Wettest	Wettest since: 1990	2013
	Ties: 1935
Jul–Sep 1991 3-Month	6.49" (164.85mm)	5.56" (141.22mm)	0.93" (23.63mm)	105th Driest	Driest since: 1989	1900
	6.49" (164.85mm)	5.56" (141.22mm)	0.93" (23.63mm)	24th Wettest	Wettest since: 1990	2013
	Ties: 1996
Jun–Sep 1991 4-Month	8.37" (212.60mm)	7.10" (180.34mm)	1.27" (32.26mm)	108th Driest	Driest since: 1990	1924
	8.37" (212.60mm)	7.10" (180.34mm)	1.27" (32.26mm)	21st Wettest	Wettest since: 1986	1965
	Ties: 2004
May–Sep 1991 5-Month	10.00" (254.00mm)	9.12" (231.65mm)	0.88" (22.35mm)	94th Driest	Driest since: 1990	1939
	10.00" (254.00mm)	9.12" (231.65mm)	0.88" (22.35mm)	35th Wettest	Wettest since: 1986	1965
	Ties: 1895
Apr–Sep 1991 6-Month	11.27" (286.26mm)	10.96" (278.38mm)	0.31" (7.88mm)	81st Driest	Driest since: 1989	1939
Apr–Sep 1991 6-Month	11.27" (286.26mm)	10.96" (278.38mm)	0.31" (7.88mm)	48th Wettest	Wettest since: 1990	1999
Mar–Sep 1991 7-Month	13.25" (336.55mm)	12.47" (316.74mm)	0.78" (19.81mm)	87th Driest	Driest since: 1989	2002
Mar–Sep 1991 7-Month	13.25" (336.55mm)	12.47" (316.74mm)	0.78" (19.81mm)	42nd Wettest	Wettest since: 1990	1941
Feb–Sep 1991 8-Month	13.69" (347.73mm)	13.56" (344.42mm)	0.13" (3.31mm)	74th Driest	Driest since: 1989	2002
Feb–Sep 1991 8-Month	13.69" (347.73mm)	13.56" (344.42mm)	0.13" (3.31mm)	55th Wettest	Wettest since: 1990	1941
Jan–Sep 1991 9-Month	14.49" (368.05mm)	14.62" (371.35mm)	-0.13" (-3.30mm)	68th Driest	Driest since: 1989	2002
Jan–Sep 1991 9-Month	14.49" (368.05mm)	14.62" (371.35mm)	-0.13" (-3.30mm)	61st Wettest	Wettest since: 1990	1957
Dec 1990–Sep 1991 10-Month	15.44" (392.18mm)	15.70" (398.78mm)	-0.26" (-6.60mm)	61st Driest	Driest since: 1989	2002
	15.44" (392.18mm)	15.70" (398.78mm)	-0.26" (-6.60mm)	67th Wettest	Wettest since: 1990	1957
	Ties: 1911
Nov 1990–Sep 1991 11-Month	16.85" (427.99mm)	16.76" (425.70mm)	0.09" (2.29mm)	70th Driest	Driest since: 1989	2002
Nov 1990–Sep 1991 11-Month	16.85" (427.99mm)	16.76" (425.70mm)	0.09" (2.29mm)	58th Wettest	Wettest since: 1990	1941
Oct 1990–Sep 1991 12-Month	18.46" (468.88mm)	18.10" (459.74mm)	0.36" (9.14mm)	74th Driest	Driest since: 1990	2002
Oct 1990–Sep 1991 12-Month	18.46" (468.88mm)	18.10" (459.74mm)	0.36" (9.14mm)	54th Wettest	Wettest since: 1987	1995
Apr 1990–Sep 1991 18-Month	30.36" (771.14mm)	29.08" (738.63mm)	1.28" (32.51mm)	88th Driest	Driest since: 1990	2002
Apr 1990–Sep 1991 18-Month	30.36" (771.14mm)	29.08" (738.63mm)	1.28" (32.51mm)	40th Wettest	Wettest since: 1987	1942
Oct 1989–Sep 1991 24-Month	36.29" (921.77mm)	36.22" (919.99mm)	0.07" (1.78mm)	64th Driest	Driest since: 1990	2003
Oct 1989–Sep 1991 24-Month	36.29" (921.77mm)	36.22" (919.99mm)	0.07" (1.78mm)	63rd Wettest	Wettest since: 1988	1942
Oct 1988–Sep 1991 36-Month	51.88" (1,317.75mm)	54.27" (1,378.46mm)	-2.39" (-60.71mm)	41st Driest	Driest since: 1990	1956
Oct 1988–Sep 1991 36-Month	51.88" (1,317.75mm)	54.27" (1,378.46mm)	-2.39" (-60.71mm)	85th Wettest	Wettest since: 1989	1997
Oct 1987–Sep 1991 48-Month	69.65" (1,769.11mm)	72.31" (1,836.67mm)	-2.66" (-67.56mm)	41st Driest	Driest since: 1979	1956
Oct 1987–Sep 1991 48-Month	69.65" (1,769.11mm)	72.31" (1,836.67mm)	-2.66" (-67.56mm)	84th Wettest	Wettest since: 1990	1998
Oct 1986–Sep 1991 60-Month	89.18" (2,265.17mm)	90.33" (2,294.38mm)	-1.15" (-29.21mm)	56th Driest	Driest since: 1981	2022
Oct 1986–Sep 1991 60-Month	89.18" (2,265.17mm)	90.33" (2,294.38mm)	-1.15" (-29.21mm)	68th Wettest	Wettest since: 1990	1999

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published May 2023, retrieved on May 29, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings