Statewide Rankings

Statewide Data Info
Please note, Degree Days and Palmer Indices are not available for Alaska. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Pennsylvania

Precipitation Rankings, May 1904

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
May 1904
1-Month 		4.03"
(102.36mm)		 3.93"
(99.82mm)		 0.10"
(2.54mm)		 72nd Driest
Driest since:
 1964
57th Wettest
Wettest since:
 1989
Apr–May 1904
2-Month 		7.61"
(193.29mm)		 7.57"
(192.28mm)		 0.04"
(1.01mm)		 65th Driest
Driest since:
 1926
64th Wettest
Wettest since:
 2011
Mar–May 1904
3-Month 		11.88"
(301.75mm)		 11.06"
(280.92mm)		 0.82"
(20.83mm)		 82nd Driest
Driest since:
 1926
47th Wettest
Wettest since:
 2011
Feb–May 1904
4-Month 		14.42"
(366.27mm)		 13.66"
(346.96mm)		 0.76"
(19.31mm)		 80th Driest
Driest since:
 1941
49th Wettest
Wettest since:
 2011
Jan–May 1904
5-Month 		17.97"
(456.44mm)		 16.71"
(424.43mm)		 1.26"
(32.01mm)		 87th Driest
Driest since:
 1941
42nd Wettest
Wettest since:
 2011
Dec 1903–May 1904
6-Month 		20.49"
(520.45mm)		 19.81"
(503.17mm)		 0.68"
(17.28mm)		 78th Driest
Driest since:
 1941
50th Wettest
Wettest since:
 2011
Nov 1903–May 1904
7-Month 		22.80"
(579.12mm)		 23.02"
(584.71mm)		 -0.22"
(-5.59mm)		 65th Driest
Driest since:
 1934
63rd Wettest
Wettest since:
 1952
Oct 1903–May 1904
8-Month 		27.19"
(690.63mm)		 26.19"
(665.23mm)		 1.00"
(25.40mm)		 76th Driest
Driest since:
 1925
52nd Wettest
Wettest since:
 2011
Sep 1903–May 1904
9-Month 		29.32"
(744.73mm)		 29.75"
(755.65mm)		 -0.43"
(-10.92mm)		 61st Driest
Driest since:
 1941
67th Wettest
Wettest since:
 2019
Aug 1903–May 1904
10-Month 		34.97"
(888.24mm)		 33.62"
(853.95mm)		 1.35"
(34.29mm)		 78th Driest
Driest since:
 1931
50th Wettest
Wettest since:
 2019
Jul 1903–May 1904
11-Month 		40.22"
(1,021.59mm)		 37.82"
(960.63mm)		 2.40"
(60.96mm)		 85th Driest
Driest since:
 1931
43rd Wettest
Wettest since:
 2019
Jun 1903–May 1904
12-Month 		46.80"
(1,188.72mm)		 41.97"
(1,066.04mm)		 4.83"
(122.68mm)		 103rd Driest
Driest since:
 1931
25th Wettest
Wettest since:
 2019
Dec 1902–May 1904
18-Month 		69.73"
(1,771.14mm)		 61.76"
(1,568.70mm)		 7.97"
(202.44mm)		 112th Driest
Driest since:
 1931
15th Wettest
Wettest to Date
 2019
Jun 1902–May 1904
24-Month 		94.75"
(2,406.65mm)		 83.91"
(2,131.31mm)		 10.84"
(275.34mm)		 112th Driest
Driest since:
 1931
15th Wettest
Wettest to Date
 2019
Jun 1901–May 1904
36-Month 		138.62"
(3,520.95mm)		 125.93"
(3,198.62mm)		 12.69"
(322.33mm)		 109th Driest
Driest since:
 1965
17th Wettest
Wettest to Date
 2020
Jun 1900–May 1904
48-Month 		180.44"
(4,583.18mm)		 167.92"
(4,265.17mm)		 12.52"
(318.01mm)		 102nd Driest
Driest since:
 1966
23rd Wettest
Wettest to Date
 2020
Jun 1899–May 1904
60-Month 		218.31"
(5,545.07mm)		 209.84"
(5,329.94mm)		 8.47"
(215.13mm)		 89th Driest
Driest since:
 1967
35th Wettest
Wettest to Date
 2022

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