Regional Rankings

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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

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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: 1998	1953, 1956
September 1999 1-Month	1.44" (36.58mm)	1.36" (34.54mm)	0.08" (2.04mm)	59th Wettest	Wettest since: 1997	2013
Aug–Sep 1999 2-Month	4.28" (108.71mm)	3.38" (85.85mm)	0.90" (22.86mm)	114th Driest	Driest since: 1998	2020
Aug–Sep 1999 2-Month	4.28" (108.71mm)	3.38" (85.85mm)	0.90" (22.86mm)	15th Wettest	Wettest since: 1997	2013
Jul–Sep 1999 3-Month	7.05" (179.07mm)	5.25" (133.35mm)	1.80" (45.72mm)	123rd Driest	Driest since: 1998	2020
Jul–Sep 1999 3-Month	7.05" (179.07mm)	5.25" (133.35mm)	1.80" (45.72mm)	6th Wettest	Wettest since: 1941	2013
Jun–Sep 1999 4-Month	8.22" (208.79mm)	6.19" (157.23mm)	2.03" (51.56mm)	123rd Driest	Driest since: 1998	2020
Jun–Sep 1999 4-Month	8.22" (208.79mm)	6.19" (157.23mm)	2.03" (51.56mm)	6th Wettest	Wettest since: 1984	1927
May–Sep 1999 5-Month	9.62" (244.35mm)	7.30" (185.42mm)	2.32" (58.93mm)	126th Driest	Driest since: 1998	2020
May–Sep 1999 5-Month	9.62" (244.35mm)	7.30" (185.42mm)	2.32" (58.93mm)	3rd Wettest	Wettest since: 1941	1941
Apr–Sep 1999 6-Month	12.00" (304.80mm)	8.36" (212.34mm)	3.64" (92.46mm)	127th Driest	Driest since: 1998	2020
Apr–Sep 1999 6-Month	12.00" (304.80mm)	8.36" (212.34mm)	3.64" (92.46mm)	2nd Wettest	Wettest since: 1941	1941
Mar–Sep 1999 7-Month	12.56" (319.02mm)	9.51" (241.55mm)	3.05" (77.47mm)	127th Driest	Driest since: 1998	1956
Mar–Sep 1999 7-Month	12.56" (319.02mm)	9.51" (241.55mm)	3.05" (77.47mm)	2nd Wettest	Wettest since: 1941	1941
Feb–Sep 1999 8-Month	13.02" (330.71mm)	10.52" (267.21mm)	2.50" (63.50mm)	125th Driest	Driest since: 1998	1956
Feb–Sep 1999 8-Month	13.02" (330.71mm)	10.52" (267.21mm)	2.50" (63.50mm)	4th Wettest	Wettest since: 1941	1941
Jan–Sep 1999 9-Month	13.68" (347.47mm)	11.50" (292.10mm)	2.18" (55.37mm)	120th Driest	Driest since: 1998	1956
Jan–Sep 1999 9-Month	13.68" (347.47mm)	11.50" (292.10mm)	2.18" (55.37mm)	9th Wettest	Wettest since: 1997	1941
Dec 1998–Sep 1999 10-Month	14.17" (359.92mm)	12.51" (317.75mm)	1.66" (42.17mm)	105th Driest	Driest since: 1998	1956
	14.17" (359.92mm)	12.51" (317.75mm)	1.66" (42.17mm)	23rd Wettest	Wettest since: 1997	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: 1998	1956
Nov 1998–Sep 1999 11-Month	15.16" (385.06mm)	13.40" (340.36mm)	1.76" (44.70mm)	24th Wettest	Wettest since: 1997	1941
Oct 1998–Sep 1999 12-Month	17.47" (443.74mm)	14.53" (369.06mm)	2.94" (74.68mm)	117th Driest	Driest since: 1998	1956
Oct 1998–Sep 1999 12-Month	17.47" (443.74mm)	14.53" (369.06mm)	2.94" (74.68mm)	11th Wettest	Wettest since: 1995	1941
Apr 1998–Sep 1999 18-Month	25.52" (648.21mm)	22.92" (582.17mm)	2.60" (66.04mm)	104th Driest	Driest since: 1996	2021
Apr 1998–Sep 1999 18-Month	25.52" (648.21mm)	22.92" (582.17mm)	2.60" (66.04mm)	24th Wettest	Wettest since: 1998	1941
Oct 1997–Sep 1999 24-Month	33.14" (841.76mm)	29.08" (738.63mm)	4.06" (103.13mm)	112th Driest	Driest since: 1998	1956
Oct 1997–Sep 1999 24-Month	33.14" (841.76mm)	29.08" (738.63mm)	4.06" (103.13mm)	15th Wettest	Wettest since: 1993	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: 1998	1956
Oct 1996–Sep 1999 36-Month	50.32" (1,278.13mm)	43.57" (1,106.68mm)	6.75" (171.45mm)	9th Wettest	Wettest since: 1987	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: 1997	1956
Oct 1995–Sep 1999 48-Month	62.66" (1,591.56mm)	58.05" (1,474.47mm)	4.61" (117.09mm)	21st Wettest	Wettest since: 1998	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: 1998	1957
Oct 1994–Sep 1999 60-Month	80.51" (2,044.95mm)	72.53" (1,842.26mm)	7.98" (202.69mm)	8th Wettest	Wettest since: 1988	1986

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Regional Rankings, published January 2023, retrieved on February 7, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings