Built 2026-10-15 (15 October 2026)

Iowa Hill Weather Records (USC00044288)

Record envelope, standing records and threshold days for Iowa Hill (USC00044288), California, United States, with 115 years of record.

Key Facts for Iowa Hill

  • Iowa Hill (USC00044288) is a weather station in California, United States at 39.12 latitude and -120.84 longitude, 945 m (3,100 ft) above sea level.
  • The station reports from 1893 to 2007, 115 years of record.
  • 1,464 records set at Iowa Hill still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Iowa Hill set a daily record precipitation of 61.0 mm (2.4 in) on 11 February 2007.

About the Station

  • Location: California, United States, 39.12 latitude, -120.84 longitude.
  • Elevation: 945 m (3,100 ft).
  • Period of record: 1893 to 2007, 115 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Iowa Hill, with 2026 drawn through them The band shows the record high and record low for each calendar day at Iowa Hill. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Iowa Hill. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Iowa Hill, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan22.2 C (72.0 F)-8.9 C (16.0 F)n/an/a
Feb25.0 C (77.0 F)-7.8 C (18.0 F)n/an/a
Mar26.1 C (79.0 F)-6.7 C (19.9 F)n/an/a
Apr31.1 C (88.0 F)-5.0 C (23.0 F)n/an/a
May36.7 C (98.1 F)0.0 C (32.0 F)n/an/a
Jun35.0 C (95.0 F)1.1 C (34.0 F)n/an/a
Jul40.0 C (104.0 F)6.7 C (44.1 F)n/an/a
Aug41.7 C (107.1 F)7.8 C (46.0 F)n/an/a
Sep36.7 C (98.1 F)4.4 C (39.9 F)n/an/a
Oct32.2 C (90.0 F)-1.1 C (30.0 F)n/an/a
Nov27.8 C (82.0 F)-2.2 C (28.0 F)n/an/a
Dec23.3 C (73.9 F)-6.1 C (21.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Iowa Hill by the year they were set 1,464 records at Iowa Hill still stand. 1906 holds the most, with 139. 0501001501904: 201905: 1351906: 1391907: 1191908: 1261909: 1311910: 521939: 131940: 1111941: 811942: 721943: 781944: 1111945: 451946: 471947: 921948: 531964: 181967: 21981: 191904190619081910194019421944194619481967
1,464 records at Iowa Hill still stand. 1906 holds the most, with 139.
Standing records at Iowa Hill by the year they were set
Year setStanding records
190420
1905135
1906139
1907119
1908126
1909131
191052
193913
1940111
194181
194272
194378
1944111
194545
194647
194792
194853
196418
19672
198119

All-Time Record Progression

4 new records
When Iowa Hill set new all-time records 4 all-time records were set at Iowa Hill between 23 December 1964 and 31 December 2005. Each dot is a new record. Record daily precipitationRecord daily snowfall23 December 1964: Record daily precipitation 181.9 mm (7.2 in)16 February 1990: Record daily snowfall 73.7 cm (29.0 in)1 January 1997: Record daily precipitation 182.9 mm (7.2 in)31 December 2005: Record daily precipitation 215.9 mm (8.5 in)1970198019902000
4 all-time records were set at Iowa Hill between 23 December 1964 and 31 December 2005. Each dot is a new record.
When Iowa Hill set new all-time records
DateKindDetail
1964-12-23Record daily precipitationRecord daily precipitation 181.9 mm (7.2 in)
1990-02-16Record daily snowfallRecord daily snowfall 73.7 cm (29.0 in)
1997-01-01Record daily precipitationRecord daily precipitation 182.9 mm (7.2 in)
2005-12-31Record daily precipitationRecord daily precipitation 215.9 mm (8.5 in)

Wettest Day of Each Month

Dec: 215.9 mm (8.5 in)
Record daily precipitation for each month at Iowa Hill The wettest day on record for each calendar month at Iowa Hill. The most was 215.9 mm (8.5 in) on 31 December 2005. 0100200300 Jan: 182.9 mm (7.2 in), 1 January 1997 Jan Feb: 135.9 mm (5.4 in), 8 February 1960 Feb Mar: 105.9 mm (4.2 in), 2 March 1995 Mar Apr: 96.5 mm (3.8 in), 13 April 2003 Apr May: 96.5 mm (3.8 in), 27 May 1942 May Jun: 42.4 mm (1.7 in), 28 June 1991 Jun Jul: 66.8 mm (2.6 in), 9 July 1974 Jul Aug: 50.8 mm (2.0 in), 15 August 1976 Aug Sep: 49.3 mm (1.9 in), 25 September 1904 Sep Oct: 155.7 mm (6.1 in), 31 October 1945 Oct Nov: 150.9 mm (5.9 in), 29 November 1945 Nov Dec: 215.9 mm (8.5 in), 31 December 2005 Dec
The wettest day on record for each calendar month at Iowa Hill. The most was 215.9 mm (8.5 in) on 31 December 2005.
Record daily precipitation for each month at Iowa Hill
MonthRecord daily precipitation (mm)Date
Jan182.9 mm (7.2 in)1 January 1997
Feb135.9 mm (5.4 in)8 February 1960
Mar105.9 mm (4.2 in)2 March 1995
Apr96.5 mm (3.8 in)13 April 2003
May96.5 mm (3.8 in)27 May 1942
Jun42.4 mm (1.7 in)28 June 1991
Jul66.8 mm (2.6 in)9 July 1974
Aug50.8 mm (2.0 in)15 August 1976
Sep49.3 mm (1.9 in)25 September 1904
Oct155.7 mm (6.1 in)31 October 1945
Nov150.9 mm (5.9 in)29 November 1945
Dec215.9 mm (8.5 in)31 December 2005

Period of Record Coverage

1904 to 1981
Days with data per year at Iowa Hill 20 years of record at Iowa Hill, 1904 to 1981. 11 years have data for under 90 percent of days and are left out of rankings: 1904, 1910, 1939, 1942, 1945, 1946, 1947, 1948 and others. 1904: 61 of 366 days1905: 363 of 365 days1906: 364 of 365 days1907: 365 of 365 days1908: 356 of 366 days1909: 363 of 365 days1910: 150 of 365 days1939: 60 of 365 days1940: 362 of 366 days1941: 354 of 365 days1942: 303 of 365 days1943: 330 of 365 days1944: 345 of 366 days1945: 164 of 365 days1946: 257 of 365 days1947: 312 of 365 days1948: 174 of 366 days1964: 59 of 366 days1967: 29 of 365 days1981: 31 of 365 days1905191019401945
20 years of record at Iowa Hill, 1904 to 1981. 11 years have data for under 90 percent of days and are left out of rankings: 1904, 1910, 1939, 1942, 1945, 1946, 1947, 1948 and others.
Days with data per year at Iowa Hill
YearDays with dataShare of yearComplete
19046117%No
190536399%Yes
1906364100%Yes
1907365100%Yes
190835697%Yes
190936399%Yes
191015041%No
19396016%No
194036299%Yes
194135497%Yes
194230383%No
194333090%Yes
194434594%Yes
194516445%No
194625770%No
194731285%No
194817448%No
19645916%No
1967298%No
1981318%No

Latest Records

20
Latest records at Iowa Hill
DateStationRecordValueBeat old record byOld record stoodSignificance
11 February 2007Iowa Hill, USdaily rain61.0 mm (2.4 in)8.2 mm (0.32 in)48 years28 of 100 (Routine)
9 February 2007Iowa Hill, USdaily rain77.5 mm (3.1 in)30.3 mm (1.2 in)47 years39 of 100 (Notable)
19 May 2006Iowa Hill, USdaily rain73.7 mm (2.9 in)5.1 mm (0.20 in)0 years14 of 100 (Routine)
2 March 2006Iowa Hill, USdaily snowfall12.7 cm (5.0 in)3.8 cm (1.5 in)29 years23 of 100 (Routine)
17 February 2006Iowa Hill, USdaily snowfall22.9 cm (9.0 in)8.9 cm (3.5 in)12 years20 of 100 (Routine)
31 December 2005Iowa Hill, USall-time rain215.9 mm (8.5 in)33.0 mm (1.3 in)8 years46 of 100 (Notable)
26 December 2005Iowa Hill, USdaily rain78.5 mm (3.1 in)2.3 mm (0.09 in)8 years13 of 100 (Routine)
2 December 2005Iowa Hill, USdaily rain80.8 mm (3.2 in)9.7 mm (0.38 in)4 years15 of 100 (Routine)
26 September 2005Iowa Hill, USdaily rain37.3 mm (1.5 in)2.2 mm (0.09 in)23 years17 of 100 (Routine)
8 June 2005Iowa Hill, USdaily rain20.6 mm (0.8 in)0.3 mm (0.01 in)4 years11 of 100 (Routine)
19 May 2005Iowa Hill, USdaily rain68.6 mm (2.7 in)34.3 mm (1.4 in)15 years42 of 100 (Notable)
9 May 2005Iowa Hill, USdaily rain39.1 mm (1.5 in)6.3 mm (0.25 in)42 years27 of 100 (Routine)
5 May 2005Iowa Hill, USdaily rain33.0 mm (1.3 in)15.2 mm (0.6 in)108 years52 of 100 (Notable)
23 April 2005Iowa Hill, USdaily rain38.4 mm (1.5 in)2.1 mm (0.08 in)7 years13 of 100 (Routine)
7 April 2005Iowa Hill, USdaily rain45.7 mm (1.8 in)6.8 mm (0.27 in)4 years15 of 100 (Routine)
23 March 2005Iowa Hill, USdaily rain74.9 mm (2.9 in)8.9 mm (0.35 in)12 years18 of 100 (Routine)
20 October 2004Iowa Hill, USdaily rain46.5 mm (1.8 in)9.9 mm (0.39 in)104 years45 of 100 (Notable)
17 October 2004Iowa Hill, USdaily rain76.7 mm (3.0 in)39.9 mm (1.6 in)20 years37 of 100 (Notable)
3 November 2003Iowa Hill, USdaily snowfall3.8 cm (1.5 in)3.8 cm (1.5 in)97 years20 of 100 (Routine)
27 August 2003Iowa Hill, USdaily rain1.8 mm (0.07 in)0.5 mm (0.02 in)107 years20 of 100 (Routine)

Extremes by Year

1893 to 2007
Yearly extremes at Iowa Hill: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)41.7 C (107.1 F)198135.9 C (96.5 F)20
Coldest night (TNn)-8.9 C (16.0 F)1910-5.0 C (23.0 F)20
Wettest day (Rx1day)215.9 mm (8.5 in)200585.4 mm (3.4 in)86
Wettest five days (Rx5day)490.8 mm (19.3 in)1964194.8 mm (7.7 in)86
Longest dry spell (CDD)179 days196673 days86

Hottest day (TXx)

Hottest day (TXx) at Iowa Hill by year The hottest day of the year at Iowa Hill, 1893 to 2007. The record is 41.7 C (107.1 F) in 1981, marked on the chart; the median year is 35.9 C (96.5 F). 20304050190019201940196019802000Record: 41.7 C (107.1 F) in 1981
The hottest day of the year at Iowa Hill, 1893 to 2007. The record is 41.7 C (107.1 F) in 1981, marked on the chart; the median year is 35.9 C (96.5 F).
Hottest day (TXx) at Iowa Hill by year
YearHottest day (TXx)
1893n/a
1894n/a
1895n/a
1896n/a
1897n/a
1898n/a
1899n/a
1900n/a
1901n/a
1902n/a
1903n/a
190422.2 C (72.0 F)
190540.0 C (104.0 F)
190636.1 C (97.0 F)
190733.3 C (91.9 F)
190839.4 C (102.9 F)
190935.6 C (96.1 F)
191036.7 C (98.1 F)
193921.1 C (70.0 F)
194036.1 C (97.0 F)
194136.7 C (98.1 F)
194237.2 C (99.0 F)
194335.6 C (96.1 F)
194436.7 C (98.1 F)
194535.0 C (95.0 F)
194636.7 C (98.1 F)
194735.6 C (96.1 F)
194831.7 C (89.1 F)
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1963n/a
196426.7 C (80.1 F)
1965n/a
1966n/a
196721.1 C (70.0 F)
1968n/a
1969n/a
1970n/a
1971n/a
1972n/a
1973n/a
1974n/a
1975n/a
1976n/a
1977n/a
1978n/a
1979n/a
1980n/a
198141.7 C (107.1 F)
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005n/a
2006n/a
2007n/a

Coldest night (TNn)

Coldest night (TNn) at Iowa Hill by year The coldest night of the year at Iowa Hill, 1893 to 2007. The record is -8.9 C (16.0 F) in 1910, marked on the chart; the median year is -5.0 C (23.0 F). -10-5051015190019201940196019802000Record: -8.9 C (16.0 F) in 1910
The coldest night of the year at Iowa Hill, 1893 to 2007. The record is -8.9 C (16.0 F) in 1910, marked on the chart; the median year is -5.0 C (23.0 F).
Coldest night (TNn) at Iowa Hill by year
YearColdest night (TNn)
1893n/a
1894n/a
1895n/a
1896n/a
1897n/a
1898n/a
1899n/a
1900n/a
1901n/a
1902n/a
1903n/a
1904-2.2 C (28.0 F)
1905-5.0 C (23.0 F)
1906-5.0 C (23.0 F)
1907-7.8 C (18.0 F)
1908-6.7 C (19.9 F)
1909-6.1 C (21.0 F)
1910-8.9 C (16.0 F)
1939-1.1 C (30.0 F)
1940-3.9 C (25.0 F)
1941-5.0 C (23.0 F)
1942-5.0 C (23.0 F)
1943-7.8 C (18.0 F)
1944-5.6 C (21.9 F)
1945-5.0 C (23.0 F)
1946-1.7 C (28.9 F)
1947-4.4 C (24.1 F)
1948-5.6 C (21.9 F)
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1963n/a
1964-1.7 C (28.9 F)
1965n/a
1966n/a
1967-1.1 C (30.0 F)
1968n/a
1969n/a
1970n/a
1971n/a
1972n/a
1973n/a
1974n/a
1975n/a
1976n/a
1977n/a
1978n/a
1979n/a
1980n/a
198111.1 C (52.0 F)
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005n/a
2006n/a
2007n/a

Wettest day (Rx1day)

Wettest day (Rx1day) at Iowa Hill by year The wettest day of the year at Iowa Hill, 1893 to 2007. The record is 215.9 mm (8.5 in) in 2005, marked on the chart; the median year is 85.4 mm (3.4 in). 050100150200250190019201940196019802000Record: 215.9 mm (8.5 in) in 2005
The wettest day of the year at Iowa Hill, 1893 to 2007. The record is 215.9 mm (8.5 in) in 2005, marked on the chart; the median year is 85.4 mm (3.4 in).
Wettest day (Rx1day) at Iowa Hill by year
YearWettest day (Rx1day)
189362.0 mm (2.4 in)
189477.5 mm (3.1 in)
189582.3 mm (3.2 in)
189698.8 mm (3.9 in)
189773.2 mm (2.9 in)
189853.1 mm (2.1 in)
189986.1 mm (3.4 in)
190066.8 mm (2.6 in)
190178.2 mm (3.1 in)
190269.1 mm (2.7 in)
190374.9 mm (2.9 in)
190474.7 mm (2.9 in)
190552.8 mm (2.1 in)
1906114.3 mm (4.5 in)
190781.5 mm (3.2 in)
190865.5 mm (2.6 in)
190992.7 mm (3.6 in)
191060.2 mm (2.4 in)
193942.7 mm (1.7 in)
194089.7 mm (3.5 in)
194176.2 mm (3.0 in)
194296.5 mm (3.8 in)
1943112.3 mm (4.4 in)
194498.6 mm (3.9 in)
1945155.7 mm (6.1 in)
194689.9 mm (3.5 in)
194754.6 mm (2.1 in)
194888.9 mm (3.5 in)
194991.4 mm (3.6 in)
1950127.5 mm (5.0 in)
1951104.1 mm (4.1 in)
195296.5 mm (3.8 in)
195367.3 mm (2.6 in)
1954104.6 mm (4.1 in)
1955141.7 mm (5.6 in)
195656.1 mm (2.2 in)
195774.7 mm (2.9 in)
195872.9 mm (2.9 in)
195963.8 mm (2.5 in)
1960135.9 mm (5.4 in)
196150.0 mm (2.0 in)
196358.7 mm (2.3 in)
1964181.9 mm (7.2 in)
196572.4 mm (2.9 in)
196661.0 mm (2.4 in)
196786.4 mm (3.4 in)
196857.2 mm (2.3 in)
1969101.3 mm (4.0 in)
197095.3 mm (3.8 in)
197180.8 mm (3.2 in)
197269.9 mm (2.8 in)
1973119.9 mm (4.7 in)
197466.8 mm (2.6 in)
197580.0 mm (3.1 in)
197650.8 mm (2.0 in)
197787.6 mm (3.4 in)
197884.6 mm (3.3 in)
1979114.3 mm (4.5 in)
1980109.0 mm (4.3 in)
198191.7 mm (3.6 in)
198293.0 mm (3.7 in)
198388.4 mm (3.5 in)
198450.3 mm (2.0 in)
198558.2 mm (2.3 in)
1986115.1 mm (4.5 in)
1987116.1 mm (4.6 in)
1988125.7 mm (4.9 in)
198973.7 mm (2.9 in)
199057.2 mm (2.3 in)
199196.5 mm (3.8 in)
1992111.8 mm (4.4 in)
199369.6 mm (2.7 in)
1994114.3 mm (4.5 in)
1995134.6 mm (5.3 in)
1996115.6 mm (4.6 in)
1997182.9 mm (7.2 in)
199890.2 mm (3.6 in)
1999101.9 mm (4.0 in)
2000110.7 mm (4.4 in)
200171.1 mm (2.8 in)
200279.2 mm (3.1 in)
200396.5 mm (3.8 in)
200476.7 mm (3.0 in)
2005215.9 mm (8.5 in)
200673.7 mm (2.9 in)
200777.5 mm (3.1 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Iowa Hill by year The wettest five days of the year at Iowa Hill, 1893 to 2007. The record is 490.8 mm (19.3 in) in 1964, marked on the chart; the median year is 194.8 mm (7.7 in). 0200400600190019201940196019802000Record: 490.8 mm (19.3 in) in 1964
The wettest five days of the year at Iowa Hill, 1893 to 2007. The record is 490.8 mm (19.3 in) in 1964, marked on the chart; the median year is 194.8 mm (7.7 in).
Wettest five days (Rx5day) at Iowa Hill by year
YearWettest five days (Rx5day)
1893171.2 mm (6.7 in)
1894186.9 mm (7.4 in)
1895174.3 mm (6.9 in)
1896261.1 mm (10.3 in)
1897248.2 mm (9.8 in)
189896.9 mm (3.8 in)
1899230.1 mm (9.1 in)
1900163.3 mm (6.4 in)
1901165.1 mm (6.5 in)
1902156.2 mm (6.1 in)
1903240.1 mm (9.5 in)
1904200.4 mm (7.9 in)
190592.3 mm (3.6 in)
1906345.5 mm (13.6 in)
1907273.3 mm (10.8 in)
1908117.7 mm (4.6 in)
1909268.3 mm (10.6 in)
1910176.6 mm (7.0 in)
193942.7 mm (1.7 in)
1940259.5 mm (10.2 in)
1941168.5 mm (6.6 in)
1942214.9 mm (8.5 in)
1943288.8 mm (11.4 in)
1944172.0 mm (6.8 in)
1945243.1 mm (9.6 in)
1946199.9 mm (7.9 in)
1947117.1 mm (4.6 in)
194893.8 mm (3.7 in)
1949138.0 mm (5.4 in)
1950400.3 mm (15.8 in)
1951176.3 mm (6.9 in)
1952241.4 mm (9.5 in)
1953114.3 mm (4.5 in)
1954169.4 mm (6.7 in)
1955397.7 mm (15.7 in)
1956142.0 mm (5.6 in)
1957193.8 mm (7.6 in)
1958213.6 mm (8.4 in)
1959151.3 mm (6.0 in)
1960236.0 mm (9.3 in)
196192.8 mm (3.7 in)
1963125.2 mm (4.9 in)
1964490.8 mm (19.3 in)
1965211.3 mm (8.3 in)
1966179.1 mm (7.1 in)
1967212.3 mm (8.4 in)
1968120.2 mm (4.7 in)
1969319.6 mm (12.6 in)
1970220.5 mm (8.7 in)
1971181.6 mm (7.1 in)
1972133.4 mm (5.3 in)
1973218.5 mm (8.6 in)
1974167.1 mm (6.6 in)
1975148.7 mm (5.9 in)
197663.3 mm (2.5 in)
1977132.5 mm (5.2 in)
1978207.7 mm (8.2 in)
1979227.8 mm (9.0 in)
1980297.3 mm (11.7 in)
1981207.8 mm (8.2 in)
1982212.2 mm (8.4 in)
1983167.2 mm (6.6 in)
1984100.0 mm (3.9 in)
198599.1 mm (3.9 in)
1986402.7 mm (15.9 in)
1987143.6 mm (5.7 in)
1988188.2 mm (7.4 in)
1989129.9 mm (5.1 in)
1990109.2 mm (4.3 in)
1991284.0 mm (11.2 in)
1992253.8 mm (10.0 in)
1993187.7 mm (7.4 in)
1994211.2 mm (8.3 in)
1995314.2 mm (12.4 in)
1996255.6 mm (10.1 in)
1997386.5 mm (15.2 in)
1998253.6 mm (10.0 in)
1999222.8 mm (8.8 in)
2000300.2 mm (11.8 in)
2001148.6 mm (5.9 in)
2002169.1 mm (6.7 in)
2003138.8 mm (5.5 in)
2004211.1 mm (8.3 in)
2005317.5 mm (12.5 in)
2006326.9 mm (12.9 in)
2007195.7 mm (7.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Iowa Hill by year The longest dry spell of the year at Iowa Hill, 1893 to 2007. The record is 179 days in 1966, marked on the chart; the median year is 73 days. 050100150200190019201940196019802000Record: 179 days in 1966
The longest dry spell of the year at Iowa Hill, 1893 to 2007. The record is 179 days in 1966, marked on the chart; the median year is 73 days.
Longest dry spell (CDD) at Iowa Hill by year
YearLongest dry spell (CDD)
1893100 days
189470 days
189589 days
189635 days
189739 days
189859 days
189966 days
190037 days
190169 days
190269 days
1903102 days
1904119 days
190577 days
190643 days
190773 days
190887 days
1909101 days
191021 days
193924 days
194093 days
194166 days
1942104 days
1943137 days
1944109 days
194523 days
194659 days
194753 days
194861 days
194999 days
195099 days
1951139 days
195260 days
195379 days
195473 days
195533 days
195662 days
195751 days
195865 days
195983 days
196064 days
196125 days
1963105 days
196475 days
196544 days
1966179 days
196796 days
196827 days
196977 days
1970112 days
197164 days
197279 days
1973117 days
197483 days
197550 days
197663 days
197754 days
197868 days
197972 days
198051 days
1981120 days
198238 days
198347 days
198479 days
198575 days
1986132 days
198796 days
198855 days
198960 days
1990111 days
199167 days
199293 days
199369 days
1994133 days
1995160 days
199632 days
199749 days
199831 days
1999102 days
200084 days
200190 days
2002168 days
200384 days
2004100 days
2005104 days
200693 days
200734 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

65 years, 1896 to 2005

A day with at least 86.2 mm (3.4 in) of rain is expected about once in 2 years. A day with at least 201.4 mm (7.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Iowa Hill: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years86.2 mm (3.4 in)
5 years113.1 mm (4.5 in)
10 years132.4 mm (5.2 in)
25 years158.6 mm (6.2 in)
50 years179.4 mm (7.1 in)
100 years201.4 mm (7.9 in)Longer than the 65 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 65 years of values from 1896 to 2005.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 215.9 mm (8.5 in) in 2005; 182.9 mm (7.2 in) in 1997; 181.9 mm (7.2 in) in 1964.

Download the Data

  • Data for Iowa Hill standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Iowa Hill threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).