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

View Period (Months):
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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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