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, September 1999

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
September 1999
1-Month
1.44"
(36.58mm)
1.36"
(34.54mm)
0.08"
(2.04mm)
70th Driest
Driest since:
1953, 1956
59th Wettest
Wettest since:
2013
Aug–Sep 1999
2-Month
4.28"
(108.71mm)
3.38"
(85.85mm)
0.90"
(22.86mm)
114th Driest
Driest since:
2020
15th Wettest
Wettest since:
2013
Jul–Sep 1999
3-Month
7.05"
(179.07mm)
5.25"
(133.35mm)
1.80"
(45.72mm)
123rd Driest
Driest since:
2020
6th Wettest
Wettest since:
2013
Jun–Sep 1999
4-Month
8.22"
(208.79mm)
6.19"
(157.23mm)
2.03"
(51.56mm)
123rd Driest
Driest since:
2020
6th Wettest
Wettest since:
1927
May–Sep 1999
5-Month
9.62"
(244.35mm)
7.30"
(185.42mm)
2.32"
(58.93mm)
126th Driest
Driest since:
2020
3rd Wettest
Wettest since:
1941
Apr–Sep 1999
6-Month
12.00"
(304.80mm)
8.36"
(212.34mm)
3.64"
(92.46mm)
127th Driest
Driest since:
2020
2nd Wettest
Wettest since:
1941
Mar–Sep 1999
7-Month
12.56"
(319.02mm)
9.51"
(241.55mm)
3.05"
(77.47mm)
127th Driest
Driest since:
1956
2nd Wettest
Wettest since:
1941
Feb–Sep 1999
8-Month
13.02"
(330.71mm)
10.52"
(267.21mm)
2.50"
(63.50mm)
125th Driest
Driest since:
1956
4th Wettest
Wettest since:
1941
Jan–Sep 1999
9-Month
13.68"
(347.47mm)
11.50"
(292.10mm)
2.18"
(55.37mm)
120th Driest
Driest since:
1956
9th Wettest
Wettest since:
1941
Dec 1998–Sep 1999
10-Month
14.17"
(359.92mm)
12.51"
(317.75mm)
1.66"
(42.17mm)
105th Driest
Driest since:
1956
23rd Wettest
Wettest since:
1941
Ties: 1979
Nov 1998–Sep 1999
11-Month
15.16"
(385.06mm)
13.40"
(340.36mm)
1.76"
(44.70mm)
104th Driest
Driest since:
1956
24th Wettest
Wettest since:
1941
Oct 1998–Sep 1999
12-Month
17.47"
(443.74mm)
14.53"
(369.06mm)
2.94"
(74.68mm)
117th Driest
Driest since:
1956
11th Wettest
Wettest since:
1941
Apr 1998–Sep 1999
18-Month
25.52"
(648.21mm)
22.92"
(582.17mm)
2.60"
(66.04mm)
104th Driest
Driest since:
2021
24th Wettest
Wettest since:
1941
Oct 1997–Sep 1999
24-Month
33.14"
(841.76mm)
29.08"
(738.63mm)
4.06"
(103.13mm)
112th Driest
Driest since:
1956
15th Wettest
Wettest since:
1942
Oct 1996–Sep 1999
36-Month
50.32"
(1,278.13mm)
43.57"
(1,106.68mm)
6.75"
(171.45mm)
117th Driest
Driest since:
1956
9th Wettest
Wettest since:
1907
Oct 1995–Sep 1999
48-Month
62.66"
(1,591.56mm)
58.05"
(1,474.47mm)
4.61"
(117.09mm)
104th Driest
Driest since:
1956
21st Wettest
Wettest since:
1986
Oct 1994–Sep 1999
60-Month
80.51"
(2,044.95mm)
72.53"
(1,842.26mm)
7.98"
(202.69mm)
116th Driest
Driest since:
1957
8th Wettest
Wettest since:
1986

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