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Built 2026-10-14 (14 October 2026)

Rock Lake Idaho Weather Records (USR0000IROC)

Record envelope, standing records and threshold days for Rock Lake Idaho (USR0000IROC), Idaho, United States, with 34 years of record.

Key Facts for Rock Lake Idaho

  • Rock Lake Idaho (USR0000IROC) is a weather station in Idaho, United States at 42.97 latitude and -114.06 longitude, 1,298 m (4,260 ft) above sea level.
  • The station reports from 1990 to 2023, 34 years of record.
  • 1,464 records set at Rock Lake Idaho still stand.
  • Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
  • Rock Lake Idaho set a daily record high maximum temperature of 29.4 C (84.9 F) on 7 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Idaho, United States, 42.97 latitude, -114.06 longitude.
  • Elevation: 1,298 m (4,260 ft).
  • Period of record: 1990 to 2023, 34 years.
  • Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

34 days at or beyond a record
Daily record high and record low at Rock Lake Idaho, with 2026 drawn through them The band shows the record high and record low for each calendar day at Rock Lake Idaho. The lines show the 2026 daily maximum and minimum. 34 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Rock Lake Idaho. The lines show the 2026 daily maximum and minimum. 34 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Rock Lake Idaho, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan14.4 C (57.9 F)-29.4 C (-20.9 F)10.6 C (51.1 F)-13.9 C (7.0 F)
Feb18.3 C (64.9 F)-30.6 C (-23.1 F)16.1 C (61.0 F)-9.4 C (15.1 F)
Mar26.7 C (80.1 F)-19.4 C (-2.9 F)26.7 C (80.1 F)-8.3 C (17.1 F)
Apr30.6 C (87.1 F)-9.4 C (15.1 F)26.7 C (80.1 F)-8.9 C (16.0 F)
May37.2 C (99.0 F)-7.1 C (19.2 F)33.9 C (93.0 F)-3.9 C (25.0 F)
Jun40.6 C (105.1 F)-3.4 C (25.9 F)33.9 C (93.0 F)-1.1 C (30.0 F)
Jul42.2 C (108.0 F)2.8 C (37.0 F)40.6 C (105.1 F)8.9 C (48.0 F)
Aug40.1 C (104.2 F)1.1 C (34.0 F)39.4 C (102.9 F)3.9 C (39.0 F)
Sep40.0 C (104.0 F)-5.0 C (23.0 F)31.1 C (88.0 F)1.7 C (35.1 F)
Oct35.0 C (95.0 F)-18.3 C (-0.9 F)32.8 C (91.0 F)2.8 C (37.0 F)
Nov23.3 C (73.9 F)-26.7 C (-16.1 F)n/an/a
Dec15.0 C (59.0 F)-36.7 C (-34.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Rock Lake Idaho by the year they were set 1,464 records at Rock Lake Idaho still stand. 1993 holds the most, with 74. 0204060801990: 311991: 311992: 561993: 741994: 441995: 461996: 641997: 181998: 261999: 592000: 362001: 362002: 582003: 422004: 372005: 292006: 332007: 302008: 392009: 352010: 422011: 352012: 382013: 452014: 562015: 492016: 352017: 382018: 312019: 252020: 362021: 352022: 352023: 332024: 342025: 402026: 331990199419982002200620102014201820222026
1,464 records at Rock Lake Idaho still stand. 1993 holds the most, with 74.
Standing records at Rock Lake Idaho by the year they were set
Year setStanding records
199031
199131
199256
199374
199444
199546
199664
199718
199826
199959
200036
200136
200258
200342
200437
200529
200633
200730
200839
200935
201042
201135
201238
201345
201456
201549
201635
201738
201831
201925
202036
202135
202235
202333
202434
202540
202633

Period of Record Coverage

1990 to 2026
Days with data per year at Rock Lake Idaho 37 years of record at Rock Lake Idaho, 1990 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1990, 2026. 1990: 183 of 365 days1991: 363 of 365 days1992: 364 of 366 days1993: 353 of 365 days1994: 362 of 365 days1995: 363 of 365 days1996: 365 of 366 days1997: 362 of 365 days1998: 365 of 365 days1999: 361 of 365 days2000: 366 of 366 days2001: 365 of 365 days2002: 365 of 365 days2003: 365 of 365 days2004: 365 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 365 of 366 days2009: 365 of 365 days2010: 364 of 365 days2011: 365 of 365 days2012: 365 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 364 of 366 days2017: 364 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 365 of 365 days2022: 363 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 284 of 365 days19901995200020052010201520202025
37 years of record at Rock Lake Idaho, 1990 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1990, 2026.
Days with data per year at Rock Lake Idaho
YearDays with dataShare of yearComplete
199018350%No
199136399%Yes
199236499%Yes
199335397%Yes
199436299%Yes
199536399%Yes
1996365100%Yes
199736299%Yes
1998365100%Yes
199936199%Yes
2000366100%Yes
2001365100%Yes
2002365100%Yes
2003365100%Yes
2004365100%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008365100%Yes
2009365100%Yes
2010364100%Yes
2011365100%Yes
2012365100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
201636499%Yes
2017364100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
2021365100%Yes
202236399%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202628478%No

Latest Records

20
Latest records at Rock Lake Idaho
DateStationRecordValueBeat old record byOld record stoodSignificance
7 October 2026Rock Lake Idaho, USdaily high max (Provisional)29.4 C (84.9 F)1.1 C (2.0 F)5 years5 of 100 (Routine)
6 October 2026Rock Lake Idaho, USdaily high max (Provisional)28.9 C (84.0 F)0.6 C (1.1 F)23 years9 of 100 (Routine)
5 October 2026Rock Lake Idaho, USdaily high max (Provisional)31.7 C (89.1 F)3.4 C (6.1 F)23 years14 of 100 (Routine)
4 October 2026Rock Lake Idaho, USdaily high max (Provisional)32.8 C (91.0 F)2.8 C (5.0 F)32 years16 of 100 (Routine)
22 September 2026Rock Lake Idaho, USdaily high min (Tie, Provisional)11.7 C (53.1 F)tie12 years1 of 100 (Routine)
17 September 2026Rock Lake Idaho, USdaily high min (Provisional)16.1 C (61.0 F)1.1 C (2.0 F)12 years8 of 100 (Routine)
15 September 2026Rock Lake Idaho, USdaily low min (Tie, Provisional)1.7 C (35.1 F)tie21 years2 of 100 (Routine)
27 August 2026Rock Lake Idaho, USdaily high min (Provisional)19.4 C (66.9 F)1.6 C (2.9 F)15 years11 of 100 (Routine)
22 August 2026Rock Lake Idaho, USdaily high min (Provisional)18.3 C (64.9 F)1.1 C (2.0 F)31 years14 of 100 (Routine)
21 August 2026Rock Lake Idaho, USdaily high max (Provisional)39.4 C (102.9 F)0.5 C (0.9 F)16 years9 of 100 (Routine)
20 August 2026Rock Lake Idaho, USdaily high max (Provisional)38.9 C (102.0 F)2.2 C (4.0 F)16 years13 of 100 (Routine)
7 August 2026Rock Lake Idaho, USdaily high max38.9 C (102.0 F)0.6 C (1.1 F)36 years14 of 100 (Routine)
5 August 2026Rock Lake Idaho, USdaily low min7.2 C (45.0 F)1.1 C (2.0 F)29 years13 of 100 (Routine)
4 August 2026Rock Lake Idaho, USdaily low min (Tie)6.1 C (43.0 F)tie29 years2 of 100 (Routine)
1 August 2026Rock Lake Idaho, USdaily high max (Tie)39.4 C (102.9 F)tie5 years1 of 100 (Routine)
31 July 2026Rock Lake Idaho, USdaily high min (Tie)19.4 C (66.9 F)tie5 years1 of 100 (Routine)
25 July 2026Rock Lake Idaho, USdaily high max38.9 C (102.0 F)0.6 C (1.1 F)17 years9 of 100 (Routine)
24 July 2026Rock Lake Idaho, USdaily high max40.6 C (105.1 F)1.7 C (3.1 F)15 years11 of 100 (Routine)
20 July 2026Rock Lake Idaho, USdaily high max40.0 C (104.0 F)0.6 C (1.1 F)23 years10 of 100 (Routine)
17 July 2026Rock Lake Idaho, USdaily high min (Tie)21.1 C (70.0 F)tie12 years1 of 100 (Routine)

Climate Trend

35 complete years, 1991 to 2025
Annual mean temperature at Rock Lake Idaho as warming stripes, 1991 to 2025 One stripe for each of 35 complete years at Rock Lake Idaho, 1991 to 2025. Blue stripes are years cooler than the station's own mean of 8.9 C (48.0 F); red stripes are warmer. The coolest year was 1993, at 6.8 C (44.2 F), and the warmest was 2012, at 10.3 C (50.5 F). The strongest colour marks a difference of 2.2 C (4.0 F). 1991: 8.7 C, -0.2 C from the station mean1992: 9.6 C, +0.7 C from the station mean1993: 6.8 C, -2.1 C from the station mean1994: 8.9 C, 0.0 C from the station mean1995: 8.7 C, -0.2 C from the station mean1996: 8.4 C, -0.5 C from the station mean1997: 8.9 C, 0.0 C from the station mean1998: 9.2 C, +0.3 C from the station mean1999: 8.5 C, -0.4 C from the station mean2000: 9.1 C, +0.2 C from the station mean2001: 9.0 C, +0.1 C from the station mean2002: 8.1 C, -0.8 C from the station mean2003: 10.2 C, +1.3 C from the station mean2004: 8.8 C, -0.1 C from the station mean2005: 8.4 C, -0.5 C from the station mean2006: 8.9 C, 0.0 C from the station mean2007: 9.4 C, +0.5 C from the station mean2008: 7.9 C, -1.0 C from the station mean2009: 8.0 C, -0.9 C from the station mean2010: 8.5 C, -0.4 C from the station mean2011: 8.1 C, -0.8 C from the station mean2012: 10.3 C, +1.4 C from the station mean2013: 9.1 C, +0.2 C from the station mean2014: 9.9 C, +1.0 C from the station mean2015: 9.9 C, +1.0 C from the station mean2016: 9.0 C, +0.1 C from the station mean2017: 8.5 C, -0.4 C from the station mean2018: 9.2 C, +0.3 C from the station mean2019: 8.2 C, -0.7 C from the station mean2020: 9.0 C, +0.1 C from the station mean2021: 10.0 C, +1.1 C from the station mean2022: 8.0 C, -0.9 C from the station mean2023: 8.6 C, -0.3 C from the station mean2024: 9.7 C, +0.8 C from the station mean2025: 10.2 C, +1.3 C from the station mean19911995200020052010201520202025
One stripe for each of 35 complete years at Rock Lake Idaho, 1991 to 2025. Blue stripes are years cooler than the station's own mean of 8.9 C (48.0 F); red stripes are warmer. The coolest year was 1993, at 6.8 C (44.2 F), and the warmest was 2012, at 10.3 C (50.5 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Rock Lake Idaho as warming stripes, 1991 to 2025
YearAnnual mean temperatureDifference from the station mean
19918.7 C-0.18 C
19929.6 C+0.65 C
19936.8 C-2.14 C
19948.9 C+0.02 C
19958.7 C-0.19 C
19968.4 C-0.54 C
19978.9 C+0.04 C
19989.2 C+0.33 C
19998.5 C-0.40 C
20009.1 C+0.16 C
20019.0 C+0.05 C
20028.1 C-0.77 C
200310.2 C+1.29 C
20048.8 C-0.08 C
20058.4 C-0.53 C
20068.9 C+0.00 C
20079.4 C+0.53 C
20087.9 C-0.99 C
20098.0 C-0.88 C
20108.5 C-0.44 C
20118.1 C-0.77 C
201210.3 C+1.35 C
20139.1 C+0.22 C
20149.9 C+0.97 C
20159.9 C+0.97 C
20169.0 C+0.10 C
20178.5 C-0.44 C
20189.2 C+0.29 C
20198.2 C-0.70 C
20209.0 C+0.13 C
202110.0 C+1.05 C
20228.0 C-0.94 C
20238.6 C-0.30 C
20249.7 C+0.77 C
202510.2 C+1.26 C

The fitted trend in annual mean temperature here over 1991 to 2025 is 0.2 C (-0.1 to 0.5) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.4 F (-0.1 to 0.8) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Rock Lake Idaho
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.2 C (-0.1 to 0.5) per decade0.4 F (-0.1 to 0.8) per decade1991 to 202535Not clearly different from zero
Mean daily maximum0.27 C (-0.02 to 0.57) per decade0.49 F (-0.04 to 1.03) per decade1991 to 202535Not clearly different from zero
Mean daily minimum0.1 C (-0.1 to 0.4) per decade0.2 F (-0.2 to 0.7) per decade1991 to 202535Not clearly different from zero

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1990 to 2026
Yearly extremes at Rock Lake Idaho: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.2 C (108.0 F)200039.4 C (102.9 F)37
Coldest night (TNn)-36.7 C (-34.1 F)1990-23.3 C (-9.9 F)37

Hottest day (TXx)

Hottest day (TXx) at Rock Lake Idaho by year The hottest day of the year at Rock Lake Idaho, 1990 to 2026. The record is 42.2 C (108.0 F) in 2000, marked on the chart; the median year is 39.4 C (102.9 F). 32.53537.54042.51990200020102020Record: 42.2 C (108.0 F) in 2000
The hottest day of the year at Rock Lake Idaho, 1990 to 2026. The record is 42.2 C (108.0 F) in 2000, marked on the chart; the median year is 39.4 C (102.9 F).
Hottest day (TXx) at Rock Lake Idaho by year
YearHottest day (TXx)
199039.4 C (102.9 F)
199137.8 C (100.0 F)
199238.3 C (100.9 F)
199333.3 C (91.9 F)
199439.4 C (102.9 F)
199536.7 C (98.1 F)
199638.3 C (100.9 F)
199737.8 C (100.0 F)
199841.1 C (106.0 F)
199937.8 C (100.0 F)
200042.2 C (108.0 F)
200140.6 C (105.1 F)
200241.7 C (107.1 F)
200342.2 C (108.0 F)
200437.2 C (99.0 F)
200539.4 C (102.9 F)
200641.7 C (107.1 F)
200740.6 C (105.1 F)
200838.9 C (102.0 F)
200938.9 C (102.0 F)
201038.3 C (100.9 F)
201138.9 C (102.0 F)
201240.0 C (104.0 F)
201341.1 C (106.0 F)
201440.6 C (105.1 F)
201540.6 C (105.1 F)
201637.8 C (100.0 F)
201738.3 C (100.9 F)
201839.4 C (102.9 F)
201938.3 C (100.9 F)
202040.0 C (104.0 F)
202139.4 C (102.9 F)
202240.0 C (104.0 F)
202339.4 C (102.9 F)
202440.2 C (104.4 F)
202538.1 C (100.6 F)
202640.6 C (105.1 F)

Coldest night (TNn)

Coldest night (TNn) at Rock Lake Idaho by year The coldest night of the year at Rock Lake Idaho, 1990 to 2026. The record is -36.7 C (-34.1 F) in 1990, marked on the chart; the median year is -23.3 C (-9.9 F). -40-30-20-101990200020102020Record: -36.7 C (-34.1 F) in 1990
The coldest night of the year at Rock Lake Idaho, 1990 to 2026. The record is -36.7 C (-34.1 F) in 1990, marked on the chart; the median year is -23.3 C (-9.9 F).
Coldest night (TNn) at Rock Lake Idaho by year
YearColdest night (TNn)
1990-36.7 C (-34.1 F)
1991-21.7 C (-7.1 F)
1992-27.2 C (-17.0 F)
1993-25.0 C (-13.0 F)
1994-19.4 C (-2.9 F)
1995-18.9 C (-2.0 F)
1996-30.6 C (-23.1 F)
1997-16.7 C (1.9 F)
1998-23.9 C (-11.0 F)
1999-21.1 C (-6.0 F)
2000-15.6 C (3.9 F)
2001-20.0 C (-4.0 F)
2002-22.2 C (-8.0 F)
2003-14.4 C (6.1 F)
2004-22.2 C (-8.0 F)
2005-22.2 C (-8.0 F)
2006-18.3 C (-0.9 F)
2007-24.4 C (-11.9 F)
2008-23.9 C (-11.0 F)
2009-24.4 C (-11.9 F)
2010-26.7 C (-16.1 F)
2011-24.4 C (-11.9 F)
2012-18.9 C (-2.0 F)
2013-28.3 C (-18.9 F)
2014-23.3 C (-9.9 F)
2015-25.0 C (-13.0 F)
2016-24.4 C (-11.9 F)
2017-29.4 C (-20.9 F)
2018-17.2 C (1.0 F)
2019-19.4 C (-2.9 F)
2020-23.3 C (-9.9 F)
2021-16.7 C (1.9 F)
2022-23.3 C (-9.9 F)
2023-23.3 C (-9.9 F)
2024-23.6 C (-10.5 F)
2025-18.8 C (-1.8 F)
2026-13.9 C (7.0 F)

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.

Frost Dates and Growing Season

35 years with a frost

Across 35 years with a frost, the median last spring frost at Rock Lake Idaho falls on 21 May and the median first autumn frost on 28 September, which leaves a median of 129 days between them.

Fitted over all years, the growing season changes by +2.4 days per decade at this station.

Frost dates and growing season at Rock Lake Idaho
MeasureMedian, all yearsEarliest periodRecent period (1996 to 2025)Recent against earliestFitted trend
Last spring frost21 Mayn/a21 Mayn/a+2.2 days per decade
First autumn frost28 Septembern/a29 Septembern/a+4.6 days per decade
Growing days129 daysn/a129 daysn/a+2.4 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Download the Data

  • Data for Rock Lake Idaho standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Rock Lake Idaho 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-13).