National Rankings

National Data Info
Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Contiguous U.S.

Precipitation Rankings, December 2015

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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
December 2015
1-Month 		4.06"
(103.12mm)		 2.35"
(59.69mm)		 1.71"
(43.43mm)		 128th Driest
Driest since:
 1930
1st Wettest
Wettest to Date
 2015
Nov–Dec 2015
2-Month 		7.41"
(188.21mm)		 4.58"
(116.33mm)		 2.83"
(71.88mm)		 128th Driest
Driest since:
 1976
1st Wettest
Wettest to Date
 2015
Oct–Dec 2015
3-Month 		10.31"
(261.87mm)		 6.74"
(171.20mm)		 3.57"
(90.67mm)		 128th Driest
Driest since:
 1917
1st Wettest
Wettest to Date
 2015
Sep–Dec 2015
4-Month 		12.43"
(315.72mm)		 9.23"
(234.44mm)		 3.20"
(81.28mm)		 127th Driest
Driest since:
 1939
2nd Wettest
Wettest to Date
 2018
Aug–Dec 2015
5-Month 		14.84"
(376.94mm)		 11.85"
(300.99mm)		 2.99"
(75.95mm)		 126th Driest
Driest since:
 1917
3rd Wettest
Wettest since:
 2018
Jul–Dec 2015
6-Month 		18.07"
(458.98mm)		 14.62"
(371.35mm)		 3.45"
(87.63mm)		 127th Driest
Driest since:
 1917
2nd Wettest
Wettest to Date
 2018
Jun–Dec 2015
7-Month 		21.62"
(549.15mm)		 17.55"
(445.77mm)		 4.07"
(103.38mm)		 127th Driest
Driest since:
 1917
2nd Wettest
Wettest to Date
 2018
May–Dec 2015
8-Month 		26.06"
(661.92mm)		 20.46"
(519.68mm)		 5.60"
(142.24mm)		 128th Driest
Driest since:
 1917
1st Wettest
Wettest to Date
 2015
Apr–Dec 2015
9-Month 		28.89"
(733.81mm)		 22.98"
(583.69mm)		 5.91"
(150.12mm)		 128th Driest
Driest since:
 1956
1st Wettest
Wettest to Date
 2015
Mar–Dec 2015
10-Month 		31.02"
(787.91mm)		 25.49"
(647.45mm)		 5.53"
(140.46mm)		 128th Driest
Driest since:
 1956
1st Wettest
Wettest to Date
 2015
Feb–Dec 2015
11-Month 		32.76"
(832.10mm)		 27.62"
(701.55mm)		 5.14"
(130.55mm)		 127th Driest
Driest since:
 1910
2nd Wettest
Wettest to Date
 2018
Jan–Dec 2015
12-Month 		34.59"
(878.59mm)		 29.94"
(760.48mm)		 4.65"
(118.11mm)		 124th Driest
Driest since:
 1910
5th Wettest
Wettest since:
 1973
Jul 2014–Dec 2015
18-Month 		50.09"
(1,272.29mm)		 44.58"
(1,132.33mm)		 5.51"
(139.96mm)		 124th Driest
Driest since:
 1954
4th Wettest
Wettest since:
 2019
Jan 2014–Dec 2015
24-Month 		65.44"
(1,662.18mm)		 59.90"
(1,521.46mm)		 5.54"
(140.72mm)		 117th Driest
Driest since:
 1931
11th Wettest
Wettest since:
 2019
Ties: 1906
Jan 2013–Dec 2015
36-Month 		96.50"
(2,451.10mm)		 89.86"
(2,282.44mm)		 6.64"
(168.66mm)		 113th Driest
Driest since:
 1956
14th Wettest
Wettest since:
 2019
Jan 2012–Dec 2015
48-Month 		124.03"
(3,150.36mm)		 119.78"
(3,042.41mm)		 4.25"
(107.95mm)		 95th Driest
Driest since:
 1956
31st Wettest
Wettest since:
 2019
Ties: 2022
Jan 2011–Dec 2015
60-Month 		154.13"
(3,914.90mm)		 149.68"
(3,801.87mm)		 4.45"
(113.03mm)		 92nd Driest
Driest since:
 1956
33rd Wettest
Wettest since:
 2019
Ties: 1908

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