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, April 1977

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
April 1977
1-Month
2.27"
(57.66mm)
2.52"
(64.01mm)
-0.25"
(-6.35mm)
40th Driest
Driest since:
1987
89th Wettest
Wettest since:
1957
Mar–Apr 1977
2-Month
5.37"
(136.40mm)
5.03"
(127.76mm)
0.34"
(8.64mm)
92nd Driest
Driest since:
1910
37th Wettest
Wettest since:
1973
Feb–Apr 1977
3-Month
6.60"
(167.64mm)
7.16"
(181.86mm)
-0.56"
(-14.22mm)
33rd Driest
Driest since:
1910
96th Wettest
Wettest since:
1983
Ties: 1915
Jan–Apr 1977
4-Month
8.18"
(207.77mm)
9.48"
(240.79mm)
-1.30"
(-33.02mm)
11th Driest
Driest since:
1910
118th Wettest
Wettest since:
1998
Ties: 2002
Dec 1976–Apr 1977
5-Month
9.54"
(242.32mm)
11.82"
(300.23mm)
-2.28"
(-57.91mm)
3rd Driest
Driest since:
1931
125th Wettest
Wettest since:
1983
Nov 1976–Apr 1977
6-Month
10.65"
(270.51mm)
14.05"
(356.87mm)
-3.40"
(-86.36mm)
1st Driest
Driest since:
1977
127th Wettest
Wettest since:
1983
Oct 1976–Apr 1977
7-Month
13.09"
(332.49mm)
16.22"
(411.99mm)
-3.13"
(-79.50mm)
4th Driest
Driest since:
1981
124th Wettest
Wettest since:
1983
Sep 1976–Apr 1977
8-Month
15.54"
(394.72mm)
18.71"
(475.23mm)
-3.17"
(-80.51mm)
3rd Driest
Driest since:
1918
125th Wettest
Wettest since:
2019
Ties: 1981
Aug 1976–Apr 1977
9-Month
17.54"
(445.52mm)
21.33"
(541.78mm)
-3.79"
(-96.26mm)
2nd Driest
Driest since:
1918
126th Wettest
Wettest since:
2019
Jul 1976–Apr 1977
10-Month
20.28"
(515.11mm)
24.12"
(612.65mm)
-3.84"
(-97.54mm)
4th Driest
Driest since:
1931
124th Wettest
Wettest since:
2019
Jun 1976–Apr 1977
11-Month
23.05"
(585.47mm)
27.04"
(686.82mm)
-3.99"
(-101.35mm)
5th Driest
Driest since:
1931
123rd Wettest
Wettest since:
2019
May 1976–Apr 1977
12-Month
25.98"
(659.89mm)
29.95"
(760.73mm)
-3.97"
(-100.84mm)
7th Driest
Driest since:
1918
121st Wettest
Wettest since:
2019
Nov 1975–Apr 1977
18-Month
38.88"
(987.55mm)
44.02"
(1,118.11mm)
-5.14"
(-130.56mm)
4th Driest
Driest since:
1931
123rd Wettest
Wettest since:
2020
May 1975–Apr 1977
24-Month
56.23"
(1,428.24mm)
59.92"
(1,521.97mm)
-3.69"
(-93.73mm)
18th Driest
Driest since:
1955
109th Wettest
Wettest since:
2020
May 1974–Apr 1977
36-Month
88.13"
(2,238.50mm)
89.88"
(2,282.95mm)
-1.75"
(-44.45mm)
40th Driest
Driest since:
1955
86th Wettest
Wettest since:
2020
May 1973–Apr 1977
48-Month
121.33"
(3,081.78mm)
119.77"
(3,042.16mm)
1.56"
(39.62mm)
71st Driest
Driest since:
1956
54th Wettest
Wettest since:
2019
May 1972–Apr 1977
60-Month
156.28"
(3,969.51mm)
149.63"
(3,800.60mm)
6.65"
(168.91mm)
103rd Driest
Driest since:
1957
21st Wettest
Wettest since:
2020

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