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 2018

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 2018
1-Month
3.25"
(82.55mm)
2.35"
(59.69mm)
0.90"
(22.86mm)
122nd Driest
Driest since:
1930
7th Wettest
Wettest since:
2015
Nov–Dec 2018
2-Month
5.96"
(151.38mm)
4.58"
(116.33mm)
1.38"
(35.05mm)
120th Driest
Driest since:
1976
9th Wettest
Wettest since:
2015
Oct–Dec 2018
3-Month
9.39"
(238.51mm)
6.74"
(171.20mm)
2.65"
(67.31mm)
126th Driest
Driest since:
1917
3rd Wettest
Wettest since:
2015
Sep–Dec 2018
4-Month
12.96"
(329.18mm)
9.23"
(234.44mm)
3.73"
(94.74mm)
128th Driest
Driest since:
1939
1st Wettest
Wettest to Date
2018
Aug–Dec 2018
5-Month
15.94"
(404.88mm)
11.85"
(300.99mm)
4.09"
(103.89mm)
128th Driest
Driest since:
1917
1st Wettest
Wettest to Date
2018
Jul–Dec 2018
6-Month
18.80"
(477.52mm)
14.62"
(371.35mm)
4.18"
(106.17mm)
128th Driest
Driest since:
1917
1st Wettest
Wettest to Date
2018
Jun–Dec 2018
7-Month
21.95"
(557.53mm)
17.55"
(445.77mm)
4.40"
(111.76mm)
128th Driest
Driest since:
1917
1st Wettest
Wettest to Date
2018
May–Dec 2018
8-Month
24.97"
(634.24mm)
20.46"
(519.68mm)
4.51"
(114.56mm)
127th Driest
Driest since:
1917
2nd Wettest
Wettest since:
2015
Apr–Dec 2018
9-Month
27.43"
(696.72mm)
22.98"
(583.69mm)
4.45"
(113.03mm)
127th Driest
Driest since:
1956
2nd Wettest
Wettest since:
2015
Mar–Dec 2018
10-Month
29.91"
(759.71mm)
25.49"
(647.45mm)
4.42"
(112.26mm)
125th Driest
Driest since:
1956
4th Wettest
Wettest since:
2015
Feb–Dec 2018
11-Month
32.80"
(833.12mm)
27.62"
(701.55mm)
5.18"
(131.57mm)
128th Driest
Driest since:
1910
1st Wettest
Wettest to Date
2018
Jan–Dec 2018
12-Month
34.65"
(880.11mm)
29.94"
(760.48mm)
4.71"
(119.63mm)
125th Driest
Driest since:
1910
4th Wettest
Wettest since:
1973
Jul 2017–Dec 2018
18-Month
48.95"
(1,243.33mm)
44.58"
(1,132.33mm)
4.37"
(111.00mm)
118th Driest
Driest since:
1954
10th Wettest
Wettest since:
2019
Jan 2017–Dec 2018
24-Month
66.96"
(1,700.78mm)
59.90"
(1,521.46mm)
7.06"
(179.32mm)
125th Driest
Driest since:
1931
3rd Wettest
Wettest since:
2019
Jan 2016–Dec 2018
36-Month
98.38"
(2,498.85mm)
89.86"
(2,282.44mm)
8.52"
(216.41mm)
120th Driest
Driest since:
1956
7th Wettest
Wettest since:
2019
Jan 2015–Dec 2018
48-Month
132.97"
(3,377.44mm)
119.78"
(3,042.41mm)
13.19"
(335.03mm)
124th Driest
Driest since:
1956
2nd Wettest
Wettest to Date
2019
Jan 2014–Dec 2018
60-Month
163.82"
(4,161.03mm)
149.68"
(3,801.87mm)
14.14"
(359.16mm)
123rd Driest
Driest since:
1956
2nd Wettest
Wettest to Date
2019

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