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, May 2021

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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
May 2021 1-Month	2.99" (75.95mm)	2.02" (51.31mm)	0.97" (24.64mm)	118th Driest	Driest since: 2020	1974
May 2021 1-Month	2.99" (75.95mm)	2.02" (51.31mm)	0.97" (24.64mm)	11th Wettest	Wettest since: 2015	2015
Apr–May 2021 2-Month	4.00" (101.60mm)	3.86" (98.04mm)	0.14" (3.56mm)	82nd Driest	Driest since: 2020	2002
Apr–May 2021 2-Month	4.00" (101.60mm)	3.86" (98.04mm)	0.14" (3.56mm)	47th Wettest	Wettest since: 2019	1957
Mar–May 2021 3-Month	6.07" (154.18mm)	5.37" (136.40mm)	0.70" (17.78mm)	97th Driest	Driest since: 2020	2002
Mar–May 2021 3-Month	6.07" (154.18mm)	5.37" (136.40mm)	0.70" (17.78mm)	32nd Wettest	Wettest since: 2019	1957
Feb–May 2021 4-Month	7.18" (182.37mm)	6.46" (164.08mm)	0.72" (18.29mm)	101st Driest	Driest since: 2020	2002
	7.18" (182.37mm)	6.46" (164.08mm)	0.72" (18.29mm)	28th Wettest	Wettest since: 2019	1905
	Ties: 2017
Jan–May 2021 5-Month	7.92" (201.17mm)	7.52" (191.01mm)	0.40" (10.16mm)	87th Driest	Driest since: 2020	2002
	7.92" (201.17mm)	7.52" (191.01mm)	0.40" (10.16mm)	42nd Wettest	Wettest since: 2019	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: 2020	2002
	8.88" (225.55mm)	8.60" (218.44mm)	0.28" (7.11mm)	45th Wettest	Wettest since: 2019	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: 2020	2002
Nov 2020–May 2021 7-Month	9.73" (247.14mm)	9.66" (245.36mm)	0.07" (1.78mm)	52nd Wettest	Wettest since: 2019	1957
Oct 2020–May 2021 8-Month	10.35" (262.89mm)	11.00" (279.40mm)	-0.65" (-16.51mm)	53rd Driest	Driest since: 2020	2002
Oct 2020–May 2021 8-Month	10.35" (262.89mm)	11.00" (279.40mm)	-0.65" (-16.51mm)	75th Wettest	Wettest since: 2019	1995
Sep 2020–May 2021 9-Month	11.32" (287.53mm)	12.43" (315.72mm)	-1.11" (-28.19mm)	46th Driest	Driest since: 2020	2002
Sep 2020–May 2021 9-Month	11.32" (287.53mm)	12.43" (315.72mm)	-1.11" (-28.19mm)	82nd Wettest	Wettest since: 2019	1942
Aug 2020–May 2021 10-Month	12.12" (307.85mm)	14.44" (366.78mm)	-2.32" (-58.93mm)	21st Driest	Driest since: 2020	2002
	12.12" (307.85mm)	14.44" (366.78mm)	-2.32" (-58.93mm)	107th Wettest	Wettest since: 2019	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: 2020	2002
Jul 2020–May 2021 11-Month	13.97" (354.84mm)	16.54" (420.12mm)	-2.57" (-65.28mm)	103rd Wettest	Wettest since: 2019	1942
Jun 2020–May 2021 12-Month	15.12" (384.05mm)	18.08" (459.23mm)	-2.96" (-75.18mm)	21st Driest	Driest since: 2020	2002
Jun 2020–May 2021 12-Month	15.12" (384.05mm)	18.08" (459.23mm)	-2.96" (-75.18mm)	107th Wettest	Wettest since: 2019	1942
Dec 2019–May 2021 18-Month	21.42" (544.07mm)	26.70" (678.18mm)	-5.28" (-134.11mm)	7th Driest	Driest since: 2013	2013
Dec 2019–May 2021 18-Month	21.42" (544.07mm)	26.70" (678.18mm)	-5.28" (-134.11mm)	120th Wettest	Wettest since: 2020	1942
Jun 2019–May 2021 24-Month	29.04" (737.62mm)	36.18" (918.97mm)	-7.14" (-181.35mm)	6th Driest	Driest since: 2013	1902
Jun 2019–May 2021 24-Month	29.04" (737.62mm)	36.18" (918.97mm)	-7.14" (-181.35mm)	121st Wettest	Wettest since: 2020	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: 2014	2022
Jun 2018–May 2021 36-Month	48.27" (1,226.06mm)	54.21" (1,376.93mm)	-5.94" (-150.87mm)	105th Wettest	Wettest since: 2020	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: 2004	1956
Jun 2017–May 2021 48-Month	63.46" (1,611.88mm)	72.23" (1,834.64mm)	-8.77" (-222.76mm)	117th Wettest	Wettest since: 2020	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: 2006	2022
Jun 2016–May 2021 60-Month	82.05" (2,084.07mm)	90.24" (2,292.10mm)	-8.19" (-208.03mm)	108th Wettest	Wettest since: 2020	1987

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published March 2023, retrieved on March 25, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings