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Data as of 2026-10-12
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Built 2026-10-16 (16 October 2026)

Rock Valley Weather Records (USC00137152)

Record envelope, standing records and threshold days for Rock Valley (USC00137152), Iowa, United States, with 49 years of record.

Key Facts for Rock Valley

  • Rock Valley (USC00137152) is a weather station in Iowa, United States at 43.20 latitude and -96.31 longitude, 380 m (1,246 ft) above sea level.
  • The station reports from 1978 to 2026, 49 years of record.
  • 0 records set at Rock Valley still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Rock Valley set a daily record precipitation of 16.3 mm (0.6 in) on 13 August 2026.

About the Station

  • Location: Iowa, United States, 43.20 latitude, -96.31 longitude.
  • Elevation: 380 m (1,246 ft).
  • Period of record: 1978 to 2026, 49 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 Rock Valley, with 2026 drawn through them The band shows the record high and record low for each calendar day at Rock Valley. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Rock Valley. 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 Rock Valley, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jann/an/an/an/a
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Aprn/an/an/an/a
Mayn/an/an/an/a
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Juln/an/an/an/a
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Octn/an/an/an/a
Novn/an/an/an/a
Decn/an/an/an/a

Which Years Hold Standing Records

0 standing records
Standing records at Rock Valley by the year they were set 0 records at Rock Valley still stand. 00000000000
0 records at Rock Valley still stand.
Standing records at Rock Valley by the year they were set
Year setStanding records

Wettest Day of Each Month

Jun: 146.1 mm (5.8 in)
Record daily precipitation for each month at Rock Valley The wettest day on record for each calendar month at Rock Valley. The most was 146.1 mm (5.8 in) on 17 June 1990. 050100150 Jan: 25.9 mm (1.0 in), 30 January 2001 Jan Feb: 29.2 mm (1.1 in), 29 February 2012 Feb Mar: 58.4 mm (2.3 in), 24 March 2018 Mar Apr: 52.1 mm (2.1 in), 6 April 1999 Apr May: 85.1 mm (3.4 in), 26 May 2013 May Jun: 146.1 mm (5.8 in), 17 June 1990 Jun Jul: 91.9 mm (3.6 in), 22 July 2010 Jul Aug: 140.7 mm (5.5 in), 6 August 2023 Aug Sep: 142.2 mm (5.6 in), 19 September 2018 Sep Oct: 91.2 mm (3.6 in), 30 October 1979 Oct Nov: 51.6 mm (2.0 in), 10 November 1998 Nov Dec: 38.1 mm (1.5 in), 27 December 1982 Dec
The wettest day on record for each calendar month at Rock Valley. The most was 146.1 mm (5.8 in) on 17 June 1990.
Record daily precipitation for each month at Rock Valley
MonthRecord daily precipitation (mm)Date
Jan25.9 mm (1.0 in)30 January 2001
Feb29.2 mm (1.1 in)29 February 2012
Mar58.4 mm (2.3 in)24 March 2018
Apr52.1 mm (2.1 in)6 April 1999
May85.1 mm (3.4 in)26 May 2013
Jun146.1 mm (5.8 in)17 June 1990
Jul91.9 mm (3.6 in)22 July 2010
Aug140.7 mm (5.5 in)6 August 2023
Sep142.2 mm (5.6 in)19 September 2018
Oct91.2 mm (3.6 in)30 October 1979
Nov51.6 mm (2.0 in)10 November 1998
Dec38.1 mm (1.5 in)27 December 1982

Latest Records

20
Latest records at Rock Valley
DateStationRecordValueBeat old record byOld record stoodSignificance
13 August 2026Rock Valley, USdaily rain16.3 mm (0.6 in)3.3 mm (0.13 in)24 years13 of 100 (Routine)
1 July 2026Rock Valley, USdaily rain30.5 mm (1.2 in)10.7 mm (0.4 in)8 years13 of 100 (Routine)
30 June 2026Rock Valley, USdaily rain24.1 mm (0.9 in)13.7 mm (0.5 in)43 years20 of 100 (Routine)
28 June 2026Rock Valley, USdaily rain95.0 mm (3.7 in)11.7 mm (0.5 in)7 years12 of 100 (Routine)
19 May 2026Rock Valley, USdaily rain14.7 mm (0.6 in)0.5 mm (0.02 in)29 years12 of 100 (Routine)
27 April 2026Rock Valley, USdaily rain39.4 mm (1.6 in)11.5 mm (0.5 in)40 years27 of 100 (Routine)
11 March 2026Rock Valley, USdaily snowfall2.5 cm (1.0 in)0.5 cm (0.2 in)28 years13 of 100 (Routine)
18 December 2025Rock Valley, USdaily rain (Tie)2.5 mm (0.10 in)tie32 years3 of 100 (Routine)
16 December 2025Rock Valley, USdaily snow depth15.2 cm (6.0 in)5.0 cm (2.0 in)12 years14 of 100 (Routine)
15 December 2025Rock Valley, USdaily snow depth17.8 cm (7.0 in)5.1 cm (2.0 in)31 years20 of 100 (Routine)
14 December 2025Rock Valley, USdaily snow depth20.3 cm (8.0 in)7.6 cm (3.0 in)32 years24 of 100 (Routine)
13 December 2025Rock Valley, USdaily snow depth20.3 cm (8.0 in)7.6 cm (3.0 in)4 years16 of 100 (Routine)
12 December 2025Rock Valley, USdaily snowfall6.4 cm (2.5 in)3.9 cm (1.5 in)24 years18 of 100 (Routine)
12 December 2025Rock Valley, USdaily snow depth17.8 cm (7.0 in)2.6 cm (1.0 in)4 years9 of 100 (Routine)
10 December 2025Rock Valley, USdaily snow depth20.3 cm (8.0 in)7.6 cm (3.0 in)36 years25 of 100 (Routine)
9 December 2025Rock Valley, USdaily snow depth27.9 cm (11.0 in)17.7 cm (7.0 in)7 years33 of 100 (Routine)
8 December 2025Rock Valley, USdaily snow depth27.9 cm (11.0 in)15.2 cm (6.0 in)7 years29 of 100 (Routine)
7 December 2025Rock Valley, USdaily snowfall21.6 cm (8.5 in)20.3 cm (8.0 in)16 years47 of 100 (Notable)
7 December 2025Rock Valley, USdaily snow depth27.9 cm (11.0 in)15.2 cm (6.0 in)7 years29 of 100 (Routine)
7 December 2025Rock Valley, USdaily rain11.9 mm (0.5 in)2.2 mm (0.09 in)31 years16 of 100 (Routine)

Extremes by Year

1978 to 2026
Yearly extremes at Rock Valley: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)146.1 mm (5.8 in)199063.5 mm (2.5 in)49
Wettest five days (Rx5day)219.5 mm (8.6 in)202499.3 mm (3.9 in)49
Longest dry spell (CDD)70 days198729 days49

Wettest day (Rx1day)

Wettest day (Rx1day) at Rock Valley by year The wettest day of the year at Rock Valley, 1978 to 2026. The record is 146.1 mm (5.8 in) in 1990, marked on the chart; the median year is 63.5 mm (2.5 in). 05010015019801990200020102020Record: 146.1 mm (5.8 in) in 1990
The wettest day of the year at Rock Valley, 1978 to 2026. The record is 146.1 mm (5.8 in) in 1990, marked on the chart; the median year is 63.5 mm (2.5 in).
Wettest day (Rx1day) at Rock Valley by year
YearWettest day (Rx1day)
197855.6 mm (2.2 in)
197991.2 mm (3.6 in)
198076.2 mm (3.0 in)
198144.5 mm (1.8 in)
198246.0 mm (1.8 in)
198394.0 mm (3.7 in)
198437.3 mm (1.5 in)
198595.5 mm (3.8 in)
198662.2 mm (2.4 in)
198738.9 mm (1.5 in)
198889.2 mm (3.5 in)
198943.9 mm (1.7 in)
1990146.1 mm (5.8 in)
199145.7 mm (1.8 in)
199270.6 mm (2.8 in)
199358.9 mm (2.3 in)
199438.4 mm (1.5 in)
199559.7 mm (2.4 in)
199674.9 mm (2.9 in)
199734.3 mm (1.4 in)
199851.6 mm (2.0 in)
199952.1 mm (2.1 in)
200051.1 mm (2.0 in)
2001117.3 mm (4.6 in)
200253.3 mm (2.1 in)
200363.5 mm (2.5 in)
200482.3 mm (3.2 in)
200554.9 mm (2.2 in)
200699.3 mm (3.9 in)
200748.0 mm (1.9 in)
200866.5 mm (2.6 in)
200961.2 mm (2.4 in)
2010121.2 mm (4.8 in)
201125.7 mm (1.0 in)
201262.2 mm (2.4 in)
201385.1 mm (3.4 in)
201485.9 mm (3.4 in)
201551.3 mm (2.0 in)
201695.0 mm (3.7 in)
201757.7 mm (2.3 in)
2018142.2 mm (5.6 in)
201983.3 mm (3.3 in)
202080.0 mm (3.1 in)
202171.1 mm (2.8 in)
202225.9 mm (1.0 in)
2023140.7 mm (5.5 in)
2024106.7 mm (4.2 in)
202574.9 mm (2.9 in)
202695.0 mm (3.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Rock Valley by year The wettest five days of the year at Rock Valley, 1978 to 2026. The record is 219.5 mm (8.6 in) in 2024, marked on the chart; the median year is 99.3 mm (3.9 in). 05010015020025019801990200020102020Record: 219.5 mm (8.6 in) in 2024
The wettest five days of the year at Rock Valley, 1978 to 2026. The record is 219.5 mm (8.6 in) in 2024, marked on the chart; the median year is 99.3 mm (3.9 in).
Wettest five days (Rx5day) at Rock Valley by year
YearWettest five days (Rx5day)
1978133.0 mm (5.2 in)
197994.2 mm (3.7 in)
198097.5 mm (3.8 in)
198175.0 mm (3.0 in)
198285.9 mm (3.4 in)
1983129.0 mm (5.1 in)
198481.5 mm (3.2 in)
1985107.2 mm (4.2 in)
1986116.7 mm (4.6 in)
198771.1 mm (2.8 in)
198891.0 mm (3.6 in)
198978.2 mm (3.1 in)
1990171.7 mm (6.8 in)
199153.6 mm (2.1 in)
1992111.8 mm (4.4 in)
1993126.4 mm (5.0 in)
199448.5 mm (1.9 in)
199585.6 mm (3.4 in)
1996106.7 mm (4.2 in)
199750.6 mm (2.0 in)
199862.0 mm (2.4 in)
199986.9 mm (3.4 in)
200062.5 mm (2.5 in)
2001117.3 mm (4.6 in)
200253.3 mm (2.1 in)
2003145.1 mm (5.7 in)
2004130.8 mm (5.1 in)
2005101.2 mm (4.0 in)
200699.3 mm (3.9 in)
200774.2 mm (2.9 in)
200882.0 mm (3.2 in)
2009118.4 mm (4.7 in)
2010157.3 mm (6.2 in)
201159.3 mm (2.3 in)
2012111.2 mm (4.4 in)
2013142.8 mm (5.6 in)
2014162.1 mm (6.4 in)
201570.4 mm (2.8 in)
201696.5 mm (3.8 in)
2017109.0 mm (4.3 in)
2018196.6 mm (7.7 in)
2019118.4 mm (4.7 in)
202080.0 mm (3.1 in)
202191.2 mm (3.6 in)
202240.4 mm (1.6 in)
2023163.6 mm (6.4 in)
2024219.5 mm (8.6 in)
2025123.4 mm (4.9 in)
2026156.0 mm (6.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Rock Valley by year The longest dry spell of the year at Rock Valley, 1978 to 2026. The record is 70 days in 1987, marked on the chart; the median year is 29 days. 02040608019801990200020102020Record: 70 days in 1987
The longest dry spell of the year at Rock Valley, 1978 to 2026. The record is 70 days in 1987, marked on the chart; the median year is 29 days.
Longest dry spell (CDD) at Rock Valley by year
YearLongest dry spell (CDD)
197829 days
197930 days
198035 days
198131 days
198221 days
198325 days
198429 days
198533 days
198665 days
198770 days
198837 days
198944 days
199045 days
199124 days
199222 days
199323 days
199437 days
199532 days
199620 days
199721 days
199845 days
199946 days
200024 days
200141 days
200229 days
200321 days
200423 days
200533 days
200622 days
200742 days
200820 days
200915 days
201026 days
201121 days
201229 days
201327 days
201423 days
201526 days
201622 days
201732 days
201824 days
201926 days
202052 days
202129 days
202226 days
202345 days
202437 days
202538 days
202652 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

46 years, 1979 to 2025

A day with at least 67.0 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 170.7 mm (6.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Rock Valley: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years67.0 mm (2.6 in)
5 years93.5 mm (3.7 in)
10 years111.5 mm (4.4 in)
25 years134.9 mm (5.3 in)
50 years152.7 mm (6.0 in)Longer than the 46 years of record
100 years170.7 mm (6.7 in)Longer than the 46 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, 46 years of values from 1979 to 2025.

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: 146.1 mm (5.8 in) in 1990; 142.2 mm (5.6 in) in 2018; 140.7 mm (5.5 in) in 2023.

Download the Data

  • Data for Rock Valley standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Rock Valley 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-12).