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 1999

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 1999
1-Month 		1.39"
(35.31mm)		 1.43"
(36.32mm)		 -0.04"
(-1.01mm)		 72nd Driest
Driest since:
 1956
57th Wettest
Wettest since:
 2013
Aug–Sep 1999
2-Month 		4.66"
(118.36mm)		 3.46"
(87.88mm)		 1.20"
(30.48mm)		 115th Driest
Driest since:
 1944
14th Wettest
Wettest since:
 2013
Jul–Sep 1999
3-Month 		7.25"
(184.15mm)		 5.56"
(141.22mm)		 1.69"
(42.93mm)		 118th Driest
Driest since:
 1900
11th Wettest
Wettest since:
 2013
Jun–Sep 1999
4-Month 		8.89"
(225.81mm)		 7.10"
(180.34mm)		 1.79"
(45.47mm)		 115th Driest
Driest since:
 1924
14th Wettest
Wettest since:
 1965
May–Sep 1999
5-Month 		11.53"
(292.86mm)		 9.12"
(231.65mm)		 2.41"
(61.21mm)		 118th Driest
Driest since:
 1939
11th Wettest
Wettest since:
 1965
Apr–Sep 1999
6-Month 		15.91"
(404.11mm)		 10.96"
(278.38mm)		 4.95"
(125.73mm)		 128th Driest
Driest since:
 1939
1st Wettest
Wettest to Date
 1999
Mar–Sep 1999
7-Month 		16.63"
(422.40mm)		 12.47"
(316.74mm)		 4.16"
(105.66mm)		 124th Driest
Driest since:
 2002
5th Wettest
Wettest since:
 1941
Feb–Sep 1999
8-Month 		17.29"
(439.17mm)		 13.56"
(344.42mm)		 3.73"
(94.75mm)		 123rd Driest
Driest since:
 2002
6th Wettest
Wettest since:
 1941
Jan–Sep 1999
9-Month 		18.36"
(466.34mm)		 14.62"
(371.35mm)		 3.74"
(94.99mm)		 124th Driest
Driest since:
 2002
5th Wettest
Wettest since:
 1957
Ties: 1905
Dec 1998–Sep 1999
10-Month 		18.99"
(482.35mm)		 15.70"
(398.78mm)		 3.29"
(83.57mm)		 118th Driest
Driest since:
 2002
10th Wettest
Wettest since:
 1957
Nov 1998–Sep 1999
11-Month 		20.33"
(516.38mm)		 16.76"
(425.70mm)		 3.57"
(90.68mm)		 119th Driest
Driest since:
 2002
9th Wettest
Wettest since:
 1941
Oct 1998–Sep 1999
12-Month 		22.83"
(579.88mm)		 18.10"
(459.74mm)		 4.73"
(120.14mm)		 124th Driest
Driest since:
 2002
4th Wettest
Wettest since:
 1995
Apr 1998–Sep 1999
18-Month 		33.40"
(848.36mm)		 29.08"
(738.63mm)		 4.32"
(109.73mm)		 121st Driest
Driest since:
 2002
7th Wettest
Wettest since:
 1942
Oct 1997–Sep 1999
24-Month 		41.47"
(1,053.34mm)		 36.22"
(919.99mm)		 5.25"
(133.35mm)		 121st Driest
Driest since:
 2003
6th Wettest
Wettest since:
 1942
Oct 1996–Sep 1999
36-Month 		63.63"
(1,616.20mm)		 54.27"
(1,378.46mm)		 9.36"
(237.74mm)		 124th Driest
Driest since:
 1956
2nd Wettest
Wettest since:
 1997
Oct 1995–Sep 1999
48-Month 		81.34"
(2,066.04mm)		 72.31"
(1,836.67mm)		 9.03"
(229.37mm)		 120th Driest
Driest since:
 1956
5th Wettest
Wettest since:
 1998
Oct 1994–Sep 1999
60-Month 		105.32"
(2,675.13mm)		 90.33"
(2,294.38mm)		 14.99"
(380.75mm)		 123rd Driest
Driest since:
 1956
1st Wettest
Wettest to Date
 1999

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