Regional Rankings

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Month:

Region:

Please note, Palmer Indices are not available for NWS Regions. Degree Days are not available for Great Plains, Souther Plains and Gulf Coast Rockies and Westward, River Basins, or Agricultural Belts. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Northwest Climate Region

Precipitation Rankings, September 1939

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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 1939 1-Month	0.91" (23.11mm)	1.42" (36.07mm)	-0.51" (-12.96mm)	32nd Driest	Driest since: 1938	1975
September 1939 1-Month	0.91" (23.11mm)	1.42" (36.07mm)	-0.51" (-12.96mm)	97th Wettest	Wettest since: 1937	2013
Aug–Sep 1939 2-Month	1.28" (32.51mm)	2.22" (56.39mm)	-0.94" (-23.88mm)	20th Driest	Driest since: 1938	2012
	1.28" (32.51mm)	2.22" (56.39mm)	-0.94" (-23.88mm)	109th Wettest	Wettest since: 1937	2013
	Ties: 2006
Jul–Sep 1939 3-Month	2.02" (51.31mm)	2.95" (74.93mm)	-0.93" (-23.62mm)	29th Driest	Driest since: 1935	1929
Jul–Sep 1939 3-Month	2.02" (51.31mm)	2.95" (74.93mm)	-0.93" (-23.62mm)	100th Wettest	Wettest since: 1938	1978
Jun–Sep 1939 4-Month	3.41" (86.61mm)	4.67" (118.62mm)	-1.26" (-32.01mm)	25th Driest	Driest since: 1938	2003
	3.41" (86.61mm)	4.67" (118.62mm)	-1.26" (-32.01mm)	104th Wettest	Wettest since: 1937	1941
	Ties: 1988
May–Sep 1939 5-Month	4.73" (120.14mm)	6.81" (172.97mm)	-2.08" (-52.83mm)	14th Driest	Driest since: 1938	1928
May–Sep 1939 5-Month	4.73" (120.14mm)	6.81" (172.97mm)	-2.08" (-52.83mm)	115th Wettest	Wettest since: 1937	1941
Apr–Sep 1939 6-Month	5.52" (140.21mm)	9.17" (232.92mm)	-3.65" (-92.71mm)	2nd Driest	Driest since: 1924	1924
Apr–Sep 1939 6-Month	5.52" (140.21mm)	9.17" (232.92mm)	-3.65" (-92.71mm)	127th Wettest	Wettest since: 1938	1948
Mar–Sep 1939 7-Month	7.94" (201.68mm)	12.43" (315.72mm)	-4.49" (-114.04mm)	3rd Driest	Driest since: 1924	1924
Mar–Sep 1939 7-Month	7.94" (201.68mm)	12.43" (315.72mm)	-4.49" (-114.04mm)	126th Wettest	Wettest since: 1938	1948
Feb–Sep 1939 8-Month	11.75" (298.45mm)	16.04" (407.42mm)	-4.29" (-108.97mm)	6th Driest	Driest since: 1935	1924
Feb–Sep 1939 8-Month	11.75" (298.45mm)	16.04" (407.42mm)	-4.29" (-108.97mm)	123rd Wettest	Wettest since: 1938	1983
Jan–Sep 1939 9-Month	15.49" (393.45mm)	20.57" (522.48mm)	-5.08" (-129.03mm)	6th Driest	Driest since: 1929	1924
Jan–Sep 1939 9-Month	15.49" (393.45mm)	20.57" (522.48mm)	-5.08" (-129.03mm)	123rd Wettest	Wettest since: 1938	1983
Dec 1938–Sep 1939 10-Month	18.68" (474.47mm)	25.21" (640.33mm)	-6.53" (-165.86mm)	6th Driest	Driest since: 1929	2001
Dec 1938–Sep 1939 10-Month	18.68" (474.47mm)	25.21" (640.33mm)	-6.53" (-165.86mm)	122nd Wettest	Wettest since: 1938	1997
Nov 1938–Sep 1939 11-Month	22.15" (562.61mm)	29.56" (750.82mm)	-7.41" (-188.21mm)	8th Driest	Driest since: 1931	2001
Nov 1938–Sep 1939 11-Month	22.15" (562.61mm)	29.56" (750.82mm)	-7.41" (-188.21mm)	120th Wettest	Wettest since: 1938	1997
Oct 1938–Sep 1939 12-Month	25.35" (643.89mm)	32.12" (815.85mm)	-6.77" (-171.96mm)	11th Driest	Driest since: 1931	1977
Oct 1938–Sep 1939 12-Month	25.35" (643.89mm)	32.12" (815.85mm)	-6.77" (-171.96mm)	117th Wettest	Wettest since: 1938	1997
Apr 1938–Sep 1939 18-Month	32.19" (817.63mm)	41.30" (1,049.02mm)	-9.11" (-231.39mm)	5th Driest	Driest since: 1931	1929, 2001
Apr 1938–Sep 1939 18-Month	32.19" (817.63mm)	41.30" (1,049.02mm)	-9.11" (-231.39mm)	123rd Wettest	Wettest since: 1938	1997
Oct 1937–Sep 1939 24-Month	61.01" (1,549.65mm)	64.26" (1,632.20mm)	-3.25" (-82.55mm)	39th Driest	Driest since: 1937	1930
Oct 1937–Sep 1939 24-Month	61.01" (1,549.65mm)	64.26" (1,632.20mm)	-3.25" (-82.55mm)	88th Wettest	Wettest since: 1938	1997
Oct 1936–Sep 1939 36-Month	88.23" (2,241.04mm)	96.34" (2,447.04mm)	-8.11" (-206.00mm)	17th Driest	Driest since: 1937	1931
Oct 1936–Sep 1939 36-Month	88.23" (2,241.04mm)	96.34" (2,447.04mm)	-8.11" (-206.00mm)	109th Wettest	Wettest since: 1938	1997
Oct 1935–Sep 1939 48-Month	118.13" (3,000.50mm)	128.40" (3,261.36mm)	-10.27" (-260.86mm)	16th Driest	Driest since: 1937	1931
Oct 1935–Sep 1939 48-Month	118.13" (3,000.50mm)	128.40" (3,261.36mm)	-10.27" (-260.86mm)	109th Wettest	Wettest since: 1938	1998
Oct 1934–Sep 1939 60-Month	148.72" (3,777.49mm)	160.37" (4,073.40mm)	-11.65" (-295.91mm)	15th Driest	Driest since: 1934	1932
Oct 1934–Sep 1939 60-Month	148.72" (3,777.49mm)	160.37" (4,073.40mm)	-11.65" (-295.91mm)	109th Wettest	Wettest since: 1938	1999

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Regional Rankings, published May 2023, retrieved on May 29, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings