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, May 2021

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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 2021
1-Month
2.99"
(75.95mm)
2.02"
(51.31mm)
0.97"
(24.64mm)
118th Driest
Driest since:
1974
11th Wettest
Wettest since:
2015
Apr–May 2021
2-Month
4.00"
(101.60mm)
3.86"
(98.04mm)
0.14"
(3.56mm)
82nd Driest
Driest since:
2002
47th Wettest
Wettest since:
1957
Mar–May 2021
3-Month
6.07"
(154.18mm)
5.37"
(136.40mm)
0.70"
(17.78mm)
97th Driest
Driest since:
2002
32nd Wettest
Wettest since:
1957
Feb–May 2021
4-Month
7.18"
(182.37mm)
6.46"
(164.08mm)
0.72"
(18.29mm)
101st Driest
Driest since:
2002
28th Wettest
Wettest since:
1905
Ties: 2017
Jan–May 2021
5-Month
7.92"
(201.17mm)
7.52"
(191.01mm)
0.40"
(10.16mm)
87th Driest
Driest since:
2002
42nd Wettest
Wettest since:
1957
Ties: 2001
Dec 2020–May 2021
6-Month
8.88"
(225.55mm)
8.60"
(218.44mm)
0.28"
(7.11mm)
83rd Driest
Driest since:
2002
45th Wettest
Wettest since:
1957
Ties: 1903, 1997
Nov 2020–May 2021
7-Month
9.73"
(247.14mm)
9.66"
(245.36mm)
0.07"
(1.78mm)
76th Driest
Driest since:
2002
52nd Wettest
Wettest since:
1957
Oct 2020–May 2021
8-Month
10.35"
(262.89mm)
11.00"
(279.40mm)
-0.65"
(-16.51mm)
53rd Driest
Driest since:
2002
75th Wettest
Wettest since:
1995
Sep 2020–May 2021
9-Month
11.32"
(287.53mm)
12.43"
(315.72mm)
-1.11"
(-28.19mm)
46th Driest
Driest since:
2002
82nd Wettest
Wettest since:
1942
Aug 2020–May 2021
10-Month
12.12"
(307.85mm)
14.44"
(366.78mm)
-2.32"
(-58.93mm)
21st Driest
Driest since:
2002
107th Wettest
Wettest since:
1942
Ties: 1951
Jul 2020–May 2021
11-Month
13.97"
(354.84mm)
16.54"
(420.12mm)
-2.57"
(-65.28mm)
25th Driest
Driest since:
2002
103rd Wettest
Wettest since:
1942
Jun 2020–May 2021
12-Month
15.12"
(384.05mm)
18.08"
(459.23mm)
-2.96"
(-75.18mm)
21st Driest
Driest since:
2002
107th Wettest
Wettest since:
1942
Dec 2019–May 2021
18-Month
21.42"
(544.07mm)
26.70"
(678.18mm)
-5.28"
(-134.11mm)
7th Driest
Driest since:
2013
120th Wettest
Wettest since:
1942
Jun 2019–May 2021
24-Month
29.04"
(737.62mm)
36.18"
(918.97mm)
-7.14"
(-181.35mm)
6th Driest
Driest since:
1902
121st Wettest
Wettest since:
1942
Jun 2018–May 2021
36-Month
48.27"
(1,226.06mm)
54.21"
(1,376.93mm)
-5.94"
(-150.87mm)
21st Driest
Driest since:
2022
105th Wettest
Wettest since:
1943
Jun 2017–May 2021
48-Month
63.46"
(1,611.88mm)
72.23"
(1,834.64mm)
-8.77"
(-222.76mm)
8th Driest
Driest since:
1956
117th Wettest
Wettest since:
1944
Jun 2016–May 2021
60-Month
82.05"
(2,084.07mm)
90.24"
(2,292.10mm)
-8.19"
(-208.03mm)
16th Driest
Driest since:
2022
108th Wettest
Wettest since:
1987

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