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 1987

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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 1987 1-Month	0.80" (20.32mm)	1.43" (36.32mm)	-0.63" (-16.00mm)	26th Driest	Driest since: 1983	1956
	0.80" (20.32mm)	1.43" (36.32mm)	-0.63" (-16.00mm)	103rd Wettest	Wettest since: 1986	2013
	Ties: 1898, 1975
Aug–Sep 1987 2-Month	3.21" (81.53mm)	3.46" (87.88mm)	-0.25" (-6.35mm)	56th Driest	Driest since: 1983	1944
Aug–Sep 1987 2-Month	3.21" (81.53mm)	3.46" (87.88mm)	-0.25" (-6.35mm)	73rd Wettest	Wettest since: 1986	2013
Jul–Sep 1987 3-Month	4.67" (118.62mm)	5.56" (141.22mm)	-0.89" (-22.60mm)	34th Driest	Driest since: 1983	1900
	4.67" (118.62mm)	5.56" (141.22mm)	-0.89" (-22.60mm)	95th Wettest	Wettest since: 1986	2013
	Ties: 1926, 1937
Jun–Sep 1987 4-Month	6.41" (162.81mm)	7.10" (180.34mm)	-0.69" (-17.53mm)	44th Driest	Driest since: 1980	1924
	6.41" (162.81mm)	7.10" (180.34mm)	-0.69" (-17.53mm)	85th Wettest	Wettest since: 1986	1965
	Ties: 1950
May–Sep 1987 5-Month	9.63" (244.60mm)	9.12" (231.65mm)	0.51" (12.95mm)	85th Driest	Driest since: 1985	1939
May–Sep 1987 5-Month	9.63" (244.60mm)	9.12" (231.65mm)	0.51" (12.95mm)	44th Wettest	Wettest since: 1986	1965
Apr–Sep 1987 6-Month	10.49" (266.45mm)	10.96" (278.38mm)	-0.47" (-11.93mm)	59th Driest	Driest since: 1980	1939
Apr–Sep 1987 6-Month	10.49" (266.45mm)	10.96" (278.38mm)	-0.47" (-11.93mm)	70th Wettest	Wettest since: 1986	1999
Mar–Sep 1987 7-Month	12.12" (307.85mm)	12.47" (316.74mm)	-0.35" (-8.89mm)	62nd Driest	Driest since: 1980	2002
Mar–Sep 1987 7-Month	12.12" (307.85mm)	12.47" (316.74mm)	-0.35" (-8.89mm)	67th Wettest	Wettest since: 1986	1941
Feb–Sep 1987 8-Month	13.93" (353.82mm)	13.56" (344.42mm)	0.37" (9.40mm)	82nd Driest	Driest since: 1980	2002
	13.93" (353.82mm)	13.56" (344.42mm)	0.37" (9.40mm)	47th Wettest	Wettest since: 1986	1941
	Ties: 1918, 1944
Jan–Sep 1987 9-Month	15.04" (382.02mm)	14.62" (371.35mm)	0.42" (10.67mm)	80th Driest	Driest since: 1981	2002
Jan–Sep 1987 9-Month	15.04" (382.02mm)	14.62" (371.35mm)	0.42" (10.67mm)	49th Wettest	Wettest since: 1986	1957
Dec 1986–Sep 1987 10-Month	15.63" (397.00mm)	15.70" (398.78mm)	-0.07" (-1.78mm)	71st Driest	Driest since: 1981	2002
	15.63" (397.00mm)	15.70" (398.78mm)	-0.07" (-1.78mm)	57th Wettest	Wettest since: 1986	1957
	Ties: 1940
Nov 1986–Sep 1987 11-Month	17.41" (442.21mm)	16.76" (425.70mm)	0.65" (16.51mm)	85th Driest	Driest since: 1981	2002
Nov 1986–Sep 1987 11-Month	17.41" (442.21mm)	16.76" (425.70mm)	0.65" (16.51mm)	43rd Wettest	Wettest since: 1986	1941
Oct 1986–Sep 1987 12-Month	19.53" (496.06mm)	18.10" (459.74mm)	1.43" (36.32mm)	92nd Driest	Driest since: 1981	2002
Oct 1986–Sep 1987 12-Month	19.53" (496.06mm)	18.10" (459.74mm)	1.43" (36.32mm)	36th Wettest	Wettest since: 1986	1995
Apr 1986–Sep 1987 18-Month	31.97" (812.04mm)	29.08" (738.63mm)	2.89" (73.41mm)	104th Driest	Driest since: 1982	2002
Apr 1986–Sep 1987 18-Month	31.97" (812.04mm)	29.08" (738.63mm)	2.89" (73.41mm)	24th Wettest	Wettest since: 1986	1942
Oct 1985–Sep 1987 24-Month	39.78" (1,010.41mm)	36.22" (919.99mm)	3.56" (90.42mm)	107th Driest	Driest since: 1982	2003
Oct 1985–Sep 1987 24-Month	39.78" (1,010.41mm)	36.22" (919.99mm)	3.56" (90.42mm)	20th Wettest	Wettest since: 1986	1942
Oct 1984–Sep 1987 36-Month	60.54" (1,537.72mm)	54.27" (1,378.46mm)	6.27" (159.26mm)	116th Driest	Driest since: 1983	1956
Oct 1984–Sep 1987 36-Month	60.54" (1,537.72mm)	54.27" (1,378.46mm)	6.27" (159.26mm)	10th Wettest	Wettest since: 1986	1997
Oct 1983–Sep 1987 48-Month	81.66" (2,074.16mm)	72.31" (1,836.67mm)	9.35" (237.49mm)	121st Driest	Driest since: 1984	1956
Oct 1983–Sep 1987 48-Month	81.66" (2,074.16mm)	72.31" (1,836.67mm)	9.35" (237.49mm)	4th Wettest	Wettest since: 1986	1998
Oct 1982–Sep 1987 60-Month	101.37" (2,574.80mm)	90.33" (2,294.38mm)	11.04" (280.42mm)	121st Driest	Driest since: 1985	2022
Oct 1982–Sep 1987 60-Month	101.37" (2,574.80mm)	90.33" (2,294.38mm)	11.04" (280.42mm)	3rd Wettest	Wettest since: 1986	1999

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published May 2023, retrieved on May 30, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings