Statewide Rankings

Statewide Data Info
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 1900

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 1900
1-Month 		1.25"
(31.75mm)		 1.43"
(36.32mm)		 -0.18"
(-4.57mm)		 56th Driest
Driest since:
 1956
73rd Wettest
Wettest since:
 2013
Ties: 1924, 1937
Aug–Sep 1900
2-Month 		1.98"
(50.29mm)		 3.46"
(87.88mm)		 -1.48"
(-37.59mm)		 10th Driest
Driest since:
 1944
119th Wettest
Wettest since:
 2013
Jul–Sep 1900
3-Month 		2.99"
(75.95mm)		 5.56"
(141.22mm)		 -2.57"
(-65.27mm)		 1st Driest
Driest since:
 1900
128th Wettest
Wettest since:
 2013
Jun–Sep 1900
4-Month 		4.42"
(112.27mm)		 7.10"
(180.34mm)		 -2.68"
(-68.07mm)		 4th Driest
Driest since:
 1924
125th Wettest
Wettest since:
 1965
Ties: 1956
May–Sep 1900
5-Month 		5.76"
(146.30mm)		 9.12"
(231.65mm)		 -3.36"
(-85.35mm)		 4th Driest
Driest since:
 1939
125th Wettest
Wettest since:
 1965
Apr–Sep 1900
6-Month 		11.21"
(284.73mm)		 10.96"
(278.38mm)		 0.25"
(6.35mm)		 78th Driest
Driest since:
 1939
51st Wettest
Wettest since:
 1999
Ties: 1992
Mar–Sep 1900
7-Month 		11.71"
(297.43mm)		 12.47"
(316.74mm)		 -0.76"
(-19.31mm)		 48th Driest
Driest since:
 2002
81st Wettest
Wettest since:
 1941
Ties: 1977
Feb–Sep 1900
8-Month 		12.78"
(324.61mm)		 13.56"
(344.42mm)		 -0.78"
(-19.81mm)		 51st Driest
Driest since:
 2002
78th Wettest
Wettest since:
 1941
Jan–Sep 1900
9-Month 		13.10"
(332.74mm)		 14.62"
(371.35mm)		 -1.52"
(-38.61mm)		 35th Driest
Driest since:
 2002
94th Wettest
Wettest since:
 1957
Dec 1899–Sep 1900
10-Month 		14.56"
(369.82mm)		 15.70"
(398.78mm)		 -1.14"
(-28.96mm)		 43rd Driest
Driest since:
 2002
85th Wettest
Wettest since:
 1957
Nov 1899–Sep 1900
11-Month 		15.52"
(394.21mm)		 16.76"
(425.70mm)		 -1.24"
(-31.49mm)		 45th Driest
Driest since:
 2002
83rd Wettest
Wettest since:
 1941
Oct 1899–Sep 1900
12-Month 		17.45"
(443.23mm)		 18.10"
(459.74mm)		 -0.65"
(-16.51mm)		 54th Driest
Driest since:
 2002
74th Wettest
Wettest since:
 1995
Apr 1899–Sep 1900
18-Month 		25.36"
(644.14mm)		 29.08"
(738.63mm)		 -3.72"
(-94.49mm)		 22nd Driest
Driest since:
 2002
106th Wettest
Wettest since:
 1942
Oct 1898–Sep 1900
24-Month 		32.83"
(833.88mm)		 36.22"
(919.99mm)		 -3.39"
(-86.11mm)		 29th Driest
Driest since:
 2003
98th Wettest
Wettest since:
 1942
Oct 1897–Sep 1900
36-Month 		51.13"
(1,298.70mm)		 54.27"
(1,378.46mm)		 -3.14"
(-79.76mm)		 35th Driest
Driest since:
 1956
91st Wettest
Wettest since:
 1997
Oct 1896–Sep 1900
48-Month 		71.03"
(1,804.16mm)		 72.31"
(1,836.67mm)		 -1.28"
(-32.51mm)		 57th Driest
Driest since:
 1956
68th Wettest
Wettest to Date
 1998
Oct 1895–Sep 1900
60-Month 		88.22"
(2,240.79mm)		 90.33"
(2,294.38mm)		 -2.11"
(-53.59mm)		 49th Driest
Driest since:
 1956
75th Wettest
Wettest to Date
 1999
Ties: 1960

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