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, October 1978

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
October 1978
1-Month
1.11"
(28.19mm)
2.16"
(54.86mm)
-1.05"
(-26.67mm)
4th Driest
Driest since:
1952
125th Wettest
Wettest since:
2009
Sep–Oct 1978
2-Month
3.55"
(90.17mm)
4.65"
(118.11mm)
-1.10"
(-27.94mm)
12th Driest
Driest since:
1952
117th Wettest
Wettest since:
2018
Ties: 1917
Aug–Oct 1978
3-Month
6.32"
(160.53mm)
7.27"
(184.66mm)
-0.95"
(-24.13mm)
16th Driest
Driest since:
1952
113th Wettest
Wettest since:
2018
Jul–Oct 1978
4-Month
9.07"
(230.38mm)
10.05"
(255.27mm)
-0.98"
(-24.89mm)
22nd Driest
Driest since:
1952
107th Wettest
Wettest since:
1941
Jun–Oct 1978
5-Month
11.62"
(295.15mm)
12.97"
(329.44mm)
-1.35"
(-34.29mm)
19th Driest
Driest since:
1952
110th Wettest
Wettest since:
1941
May–Oct 1978
6-Month
15.26"
(387.60mm)
15.88"
(403.35mm)
-0.62"
(-15.75mm)
37th Driest
Driest since:
1952
92nd Wettest
Wettest since:
1941
Apr–Oct 1978
7-Month
17.80"
(452.12mm)
18.40"
(467.36mm)
-0.60"
(-15.24mm)
40th Driest
Driest since:
1952
89th Wettest
Wettest since:
1941
Ties: 1902
Mar–Oct 1978
8-Month
20.06"
(509.52mm)
20.91"
(531.11mm)
-0.85"
(-21.59mm)
34th Driest
Driest since:
1956
95th Wettest
Wettest since:
2019
Feb–Oct 1978
9-Month
21.83"
(554.48mm)
23.04"
(585.22mm)
-1.21"
(-30.74mm)
27th Driest
Driest since:
1934
102nd Wettest
Wettest since:
2019
Jan–Oct 1978
10-Month
25.01"
(635.25mm)
25.36"
(644.14mm)
-0.35"
(-8.89mm)
50th Driest
Driest since:
1934
79th Wettest
Wettest since:
2019
Dec 1977–Oct 1978
11-Month
27.73"
(704.34mm)
27.70"
(703.58mm)
0.03"
(0.76mm)
61st Driest
Driest since:
1931
67th Wettest
Wettest since:
2019
Ties: 1896
Nov 1977–Oct 1978
12-Month
30.59"
(776.99mm)
29.93"
(760.22mm)
0.66"
(16.77mm)
75th Driest
Driest since:
1934
53rd Wettest
Wettest since:
2019
Ties: 1935
May 1977–Oct 1978
18-Month
47.27"
(1,200.66mm)
45.83"
(1,164.08mm)
1.44"
(36.58mm)
83rd Driest
Driest since:
1931
45th Wettest
Wettest since:
2019
Nov 1976–Oct 1978
24-Month
57.92"
(1,471.17mm)
59.90"
(1,521.46mm)
-1.98"
(-50.29mm)
33rd Driest
Driest since:
1931
94th Wettest
Wettest since:
2019
Nov 1975–Oct 1978
36-Month
86.15"
(2,188.21mm)
89.86"
(2,282.44mm)
-3.71"
(-94.23mm)
25th Driest
Driest since:
1956
101st Wettest
Wettest since:
2019
Nov 1974–Oct 1978
48-Month
119.39"
(3,032.51mm)
119.78"
(3,042.41mm)
-0.39"
(-9.90mm)
53rd Driest
Driest since:
1956
72nd Wettest
Wettest since:
2019
Nov 1973–Oct 1978
60-Month
151.67"
(3,852.42mm)
149.66"
(3,801.36mm)
2.01"
(51.06mm)
73rd Driest
Driest since:
1934
51st Wettest
Wettest since:
2019

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