Regional Rankings

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

Southwest Climate Region

Precipitation Rankings, May 1940

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1940
1-Month
1.10"
(27.94mm)
1.11"
(28.19mm)
-0.01"
(-0.25mm)
66th Driest
Driest since:
1974
63rd Wettest
Wettest since:
2015
Ties: 1919
Apr–May 1940
2-Month
2.21"
(56.13mm)
2.17"
(55.12mm)
0.04"
(1.01mm)
68th Driest
Driest since:
2002
61st Wettest
Wettest since:
1941
Ties: 1908
Mar–May 1940
3-Month
2.97"
(75.44mm)
3.33"
(84.58mm)
-0.36"
(-9.14mm)
52nd Driest
Driest since:
2002
77th Wettest
Wettest since:
1941
Feb–May 1940
4-Month
4.50"
(114.30mm)
4.33"
(109.98mm)
0.17"
(4.32mm)
81st Driest
Driest since:
2002
48th Wettest
Wettest since:
1905
Jan–May 1940
5-Month
5.68"
(144.27mm)
5.31"
(134.87mm)
0.37"
(9.40mm)
88th Driest
Driest since:
1972
41st Wettest
Wettest since:
1905
Ties: 2001
Dec 1939–May 1940
6-Month
6.16"
(156.46mm)
6.32"
(160.53mm)
-0.16"
(-4.07mm)
75th Driest
Driest since:
2002
53rd Wettest
Wettest since:
1905
Ties: 1898
Nov 1939–May 1940
7-Month
6.77"
(171.96mm)
7.21"
(183.13mm)
-0.44"
(-11.17mm)
59th Driest
Driest since:
2002
69th Wettest
Wettest since:
1941
Oct 1939–May 1940
8-Month
7.50"
(190.50mm)
8.34"
(211.84mm)
-0.84"
(-21.34mm)
44th Driest
Driest since:
2002
84th Wettest
Wettest since:
1941
Sep 1939–May 1940
9-Month
9.70"
(246.38mm)
9.71"
(246.63mm)
-0.01"
(-0.25mm)
70th Driest
Driest since:
2002
58th Wettest
Wettest since:
1941
Ties: 1947
Aug 1939–May 1940
10-Month
11.11"
(282.19mm)
11.72"
(297.69mm)
-0.61"
(-15.50mm)
58th Driest
Driest since:
2002
70th Wettest
Wettest since:
1941
Ties: 1970
Jul 1939–May 1940
11-Month
12.43"
(315.72mm)
13.59"
(345.19mm)
-1.16"
(-29.47mm)
52nd Driest
Driest since:
2021
76th Wettest
Wettest since:
1941
Jun 1939–May 1940
12-Month
12.90"
(327.66mm)
14.53"
(369.06mm)
-1.63"
(-41.40mm)
44th Driest
Driest since:
2021
84th Wettest
Wettest since:
1905
Ties: 1989
Dec 1938–May 1940
18-Month
18.82"
(478.03mm)
20.86"
(529.84mm)
-2.04"
(-51.81mm)
37th Driest
Driest since:
2021
90th Wettest
Wettest since:
1942
Jun 1938–May 1940
24-Month
26.58"
(675.13mm)
29.05"
(737.87mm)
-2.47"
(-62.74mm)
31st Driest
Driest since:
2021
96th Wettest
Wettest since:
1942
Jun 1937–May 1940
36-Month
40.89"
(1,038.61mm)
43.54"
(1,105.92mm)
-2.65"
(-67.31mm)
38th Driest
Driest since:
2022
88th Wettest
Wettest since:
1907
Jun 1936–May 1940
48-Month
56.47"
(1,434.34mm)
58.01"
(1,473.45mm)
-1.54"
(-39.11mm)
56th Driest
Driest since:
1904
69th Wettest
Wettest since:
1986
Jun 1935–May 1940
60-Month
69.13"
(1,755.90mm)
72.48"
(1,840.99mm)
-3.35"
(-85.09mm)
42nd Driest
Driest since:
1957
82nd Wettest
Wettest since:
1987

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