National Weather Service United States Department of Commerce
 

Greatest observed point precipitation values for the USA


USmap
 
 

Duration Amount
(in)
Amount
(mm)
Location Lat
(deg)
Long
(deg)
Start date Ref
1-min 1.23 31.2 Unionville, MD 38.80 -76.13 4 Jul 1956 2,3,4,5
5-min 2.03 52 Alamogordo Creek, NM 34.66 -104.39 5 Jun 1960 4
12-min 2.30 58 Embarrass, WI 44.67 -88.71 28 May 1881 4
15-min 3.95 100 Galveston, TX 29.29 -94.79 4 Jun 1871 4
30-min 7.00 178 Cambridge, OH 40.00 -81.58 16 Jul 1914 4
42-min 12.0 305 Holt, MO 39.45 -94.33 22 Jun 1947 1,4
13.8* 351* Burnsville 6 WNW, WV 38.88 -80.77 4 Aug 1943 4
60-min 12.0 305 Holt, MO 39.45 -94.33 22 Jun 1947 2,3,5
12.0 305 Kilauea Sugar Plantation, Kauai, HI 22.21 -159.41 24 Jan 1956 3,5
90-min 14.6* 371* Burnsville 6 WNW, WV 38.88 -80.77 4 Aug 1943 4
2-hr 15.0 381 Woodward Ranch (D'Hanis), TX 29.49 -99.38 31 May 1935 4
2.17-hr 19.0 483 Rockport, WV 39.07 -81.55 18 Jul 1889 1
2.75-hr 22.0 559 Woodward Ranch (D'Hanis), TX 29.49 -99.38 31 May 1935 1,4
3-hr 28.5 724 Smethport, PA 41.80 -78.45 18 Jul 1942 4
4.5-hr 30.7 780 Smethport, PA 41.80 -78.45 18 Jul 1942 1,4
12-hr 34.3 871 Smethport, PA 41.80 -78.45 17 Jul 1942 4
18-hr 36.4 925 Thrall, TX 30.59 -97.30 9 Sep 1921 4
24-hr 43.0 1092 Alvin, TX 29.42 -95.24 25 Jul 1979 3,4,5
4-day 62.0 1575 Kukaiau, Hamakua, HI 20.02 -155.37 27 Feb 1902 4
8-day 82.0 2083 Kukaiau, Hamakua, HI 20.02 -155.37 28 Feb 1902 4
1-month 149 3800 Mt. Waialeale, Kauai, HI 22.07 -159.50 1 Mar 1982 4
12-month 739 18780 Kukui, Maui, HI 20.90 -156.60 1 Dec 1981 3

Disclaimers: Some data are estimates. Not all data have been verified. "*" indicates questionable veracity. Coordinates are approximate.