Built 2026-10-16 (16 October 2026)

Boise 7 N Weather Records (USC00101017)

Record envelope, standing records and threshold days for Boise 7 N (USC00101017), Idaho, United States, with 54 years of record.

Key Facts for Boise 7 N

  • Boise 7 N (USC00101017) is a weather station in Idaho, United States at 43.74 latitude and -116.20 longitude, 1,184 m (3,885 ft) above sea level.
  • The station reports from 1973 to 2026, 54 years of record.
  • 1,464 records set at Boise 7 N still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Boise 7 N set a daily record high maximum temperature of 38.3 C (100.9 F) on 25 July 2026.

About the Station

  • Location: Idaho, United States, 43.74 latitude, -116.20 longitude.
  • Elevation: 1,184 m (3,885 ft).
  • Period of record: 1973 to 2026, 54 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

4 days at or beyond a record
Daily record high and record low at Boise 7 N, with 2026 drawn through them The band shows the record high and record low for each calendar day at Boise 7 N. The lines show the 2026 daily maximum and minimum. 4 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 Boise 7 N. The lines show the 2026 daily maximum and minimum. 4 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Boise 7 N, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan16.1 C (61.0 F)-23.3 C (-9.9 F)11.1 C (52.0 F)0.0 C (32.0 F)
Feb19.4 C (66.9 F)-26.7 C (-16.1 F)n/an/a
Mar25.0 C (77.0 F)-12.8 C (9.0 F)n/an/a
Apr31.1 C (88.0 F)-7.8 C (18.0 F)n/an/a
May35.0 C (95.0 F)-6.7 C (19.9 F)33.3 C (91.9 F)0.0 C (32.0 F)
Jun40.0 C (104.0 F)-2.2 C (28.0 F)32.2 C (90.0 F)3.9 C (39.0 F)
Jul40.6 C (105.1 F)2.2 C (36.0 F)38.3 C (100.9 F)8.9 C (48.0 F)
Aug41.1 C (106.0 F)1.1 C (34.0 F)36.7 C (98.1 F)8.3 C (46.9 F)
Sep37.8 C (100.0 F)-2.8 C (27.0 F)n/an/a
Oct33.3 C (91.9 F)-11.1 C (12.0 F)n/an/a
Nov22.2 C (72.0 F)-20.0 C (-4.0 F)n/an/a
Dec16.7 C (62.1 F)-30.6 C (-23.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Boise 7 N by the year they were set 1,464 records at Boise 7 N still stand. 1990 holds the most, with 55. 02040601973: 201974: 501975: 441976: 211977: 421978: 331979: 371980: 281981: 251982: 271983: 251984: 341985: 471986: 411987: 421988: 391989: 301990: 551991: 211992: 441993: 501994: 241995: 261996: 381997: 181998: 91999: 332000: 122001: 182002: 352003: 412004: 102005: 122006: 122007: 202008: 272009: 262010: 162011: 202012: 122013: 312014: 262015: 422016: 292017: 312018: 162019: 242020: 252021: 22022: 22023: 92024: 262025: 332026: 4197319791985199119972003200920152021
1,464 records at Boise 7 N still stand. 1990 holds the most, with 55.
Standing records at Boise 7 N by the year they were set
Year setStanding records
197320
197450
197544
197621
197742
197833
197937
198028
198125
198227
198325
198434
198547
198641
198742
198839
198930
199055
199121
199244
199350
199424
199526
199638
199718
19989
199933
200012
200118
200235
200341
200410
200512
200612
200720
200827
200926
201016
201120
201212
201331
201426
201542
201629
201731
201816
201924
202025
20212
20222
20239
202426
202533
20264

All-Time Record Progression

3 new records
When Boise 7 N set new all-time records 3 all-time records were set at Boise 7 N between 27 December 2008 and 13 February 2021. Each dot is a new record. Record snow depthRecord daily snowfall27 December 2008: Record snow depth 58.4 cm (23.0 in)2 December 2018: Record daily snowfall 31.8 cm (12.5 in)13 February 2021: Record daily snowfall 34.0 cm (13.4 in)201020152020
3 all-time records were set at Boise 7 N between 27 December 2008 and 13 February 2021. Each dot is a new record.
When Boise 7 N set new all-time records
DateKindDetail
2008-12-27Record snow depthRecord snow depth 58.4 cm (23.0 in)
2018-12-02Record daily snowfallRecord daily snowfall 31.8 cm (12.5 in)
2021-02-13Record daily snowfallRecord daily snowfall 34.0 cm (13.4 in)

Wettest Day of Each Month

Jun: 57.9 mm (2.3 in)
Record daily precipitation for each month at Boise 7 N The wettest day on record for each calendar month at Boise 7 N. The most was 57.9 mm (2.3 in) on 11 June 1976. 0204060 Jan: 50.3 mm (2.0 in), 19 January 2012 Jan Feb: 33.0 mm (1.3 in), 12 February 1975 Feb Mar: 29.7 mm (1.2 in), 30 March 2017 Mar Apr: 37.3 mm (1.5 in), 26 April 2012 Apr May: 35.8 mm (1.4 in), 22 May 2010 May Jun: 57.9 mm (2.3 in), 11 June 1976 Jun Jul: 35.1 mm (1.4 in), 28 July 1984 Jul Aug: 42.2 mm (1.7 in), 13 August 1979 Aug Sep: 49.8 mm (2.0 in), 10 September 1980 Sep Oct: 42.2 mm (1.7 in), 24 October 2010 Oct Nov: 27.9 mm (1.1 in), 1 November 2014 Nov Dec: 34.3 mm (1.4 in), 25 December 1996 Dec
The wettest day on record for each calendar month at Boise 7 N. The most was 57.9 mm (2.3 in) on 11 June 1976.
Record daily precipitation for each month at Boise 7 N
MonthRecord daily precipitation (mm)Date
Jan50.3 mm (2.0 in)19 January 2012
Feb33.0 mm (1.3 in)12 February 1975
Mar29.7 mm (1.2 in)30 March 2017
Apr37.3 mm (1.5 in)26 April 2012
May35.8 mm (1.4 in)22 May 2010
Jun57.9 mm (2.3 in)11 June 1976
Jul35.1 mm (1.4 in)28 July 1984
Aug42.2 mm (1.7 in)13 August 1979
Sep49.8 mm (2.0 in)10 September 1980
Oct42.2 mm (1.7 in)24 October 2010
Nov27.9 mm (1.1 in)1 November 2014
Dec34.3 mm (1.4 in)25 December 1996

Period of Record Coverage

1973 to 2026
Days with data per year at Boise 7 N 54 years of record at Boise 7 N, 1973 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1973, 2020, 2021, 2022, 2023, 2026. 1973: 245 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 364 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 366 of 366 days1981: 365 of 365 days1982: 364 of 365 days1983: 364 of 365 days1984: 365 of 366 days1985: 364 of 365 days1986: 365 of 365 days1987: 365 of 365 days1988: 366 of 366 days1989: 365 of 365 days1990: 365 of 365 days1991: 364 of 365 days1992: 366 of 366 days1993: 364 of 365 days1994: 365 of 365 days1995: 365 of 365 days1996: 366 of 366 days1997: 365 of 365 days1998: 364 of 365 days1999: 363 of 365 days2000: 365 of 366 days2001: 363 of 365 days2002: 363 of 365 days2003: 363 of 365 days2004: 364 of 366 days2005: 362 of 365 days2006: 365 of 365 days2007: 364 of 365 days2008: 362 of 366 days2009: 365 of 365 days2010: 363 of 365 days2011: 362 of 365 days2012: 365 of 366 days2013: 362 of 365 days2014: 350 of 365 days2015: 363 of 365 days2016: 365 of 366 days2017: 362 of 365 days2018: 359 of 365 days2019: 362 of 365 days2020: 329 of 366 days2021: 73 of 365 days2022: 14 of 365 days2023: 242 of 365 days2024: 359 of 366 days2025: 338 of 365 days2026: 95 of 365 days19801990200020102020
54 years of record at Boise 7 N, 1973 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1973, 2020, 2021, 2022, 2023, 2026.
Days with data per year at Boise 7 N
YearDays with dataShare of yearComplete
197324567%No
1974365100%Yes
1975365100%Yes
197636499%Yes
1977365100%Yes
1978365100%Yes
1979365100%Yes
1980366100%Yes
1981365100%Yes
1982364100%Yes
1983364100%Yes
1984365100%Yes
1985364100%Yes
1986365100%Yes
1987365100%Yes
1988366100%Yes
1989365100%Yes
1990365100%Yes
1991364100%Yes
1992366100%Yes
1993364100%Yes
1994365100%Yes
1995365100%Yes
1996366100%Yes
1997365100%Yes
1998364100%Yes
199936399%Yes
2000365100%Yes
200136399%Yes
200236399%Yes
200336399%Yes
200436499%Yes
200536299%Yes
2006365100%Yes
2007364100%Yes
200836299%Yes
2009365100%Yes
201036399%Yes
201136299%Yes
2012365100%Yes
201336299%Yes
201435096%Yes
201536399%Yes
2016365100%Yes
201736299%Yes
201835998%Yes
201936299%Yes
202032990%No
20217320%No
2022144%No
202324266%No
202435998%Yes
202533893%Yes
20269526%No

Latest Records

20
Latest records at Boise 7 N
DateStationRecordValueBeat old record byOld record stoodSignificance
25 July 2026Boise 7 N, USdaily high max38.3 C (100.9 F)1.1 C (2.0 F)41 years19 of 100 (Routine)
20 July 2026Boise 7 N, USdaily high min21.7 C (71.1 F)0.6 C (1.1 F)47 years20 of 100 (Routine)
20 July 2026Boise 7 N, USdaily high max37.8 C (100.0 F)0.6 C (1.1 F)44 years19 of 100 (Routine)
26 June 2026Boise 7 N, USdaily rain20.8 mm (0.8 in)11.9 mm (0.5 in)28 years20 of 100 (Routine)
20 June 2026Boise 7 N, USdaily rain (Tie)7.9 mm (0.31 in)tie41 years4 of 100 (Routine)
12 May 2026Boise 7 N, USdaily high max33.3 C (91.9 F)1.6 C (2.9 F)37 years18 of 100 (Routine)
10 May 2026Boise 7 N, USdaily high max (Tie)28.9 C (84.0 F)tie39 years4 of 100 (Routine)
25 December 2025Boise 7 N, USdaily high max13.9 C (57.0 F)2.2 C (4.0 F)44 years22 of 100 (Routine)
25 December 2025Boise 7 N, USdaily high min5.6 C (42.1 F)1.7 C (3.1 F)44 years21 of 100 (Routine)
24 December 2025Boise 7 N, USdaily high min5.6 C (42.1 F)2.8 C (5.0 F)0 years10 of 100 (Routine)
23 December 2025Boise 7 N, USdaily high max15.0 C (59.0 F)3.3 C (5.9 F)6 years12 of 100 (Routine)
23 December 2025Boise 7 N, USdaily high min5.6 C (42.1 F)2.8 C (5.0 F)0 years10 of 100 (Routine)
16 December 2025Boise 7 N, USdaily high max13.3 C (55.9 F)2.7 C (4.9 F)52 years25 of 100 (Routine)
16 December 2025Boise 7 N, USdaily high min7.2 C (45.0 F)3.3 C (5.9 F)43 years23 of 100 (Routine)
13 December 2025Boise 7 N, USdaily high max14.4 C (57.9 F)3.3 C (5.9 F)48 years25 of 100 (Routine)
12 December 2025Boise 7 N, USdaily high max (Tie)14.4 C (57.9 F)tie32 years3 of 100 (Routine)
10 December 2025Boise 7 N, USdaily high min8.9 C (48.0 F)1.1 C (2.0 F)32 years16 of 100 (Routine)
5 December 2025Boise 7 N, USdaily rain14.2 mm (0.6 in)1.2 mm (0.05 in)12 years10 of 100 (Routine)
16 November 2025Boise 7 N, USdaily high min7.2 C (45.0 F)0.5 C (0.9 F)44 years19 of 100 (Routine)
14 November 2025Boise 7 N, USdaily high max (Tie)16.1 C (61.0 F)tie26 years3 of 100 (Routine)

Climate Trend

49 complete years, 1974 to 2025
Annual mean temperature at Boise 7 N as warming stripes, 1974 to 2025 One stripe for each of 49 complete years at Boise 7 N, 1974 to 2025. Blue stripes are years cooler than the station's own mean of 9.9 C (49.8 F); red stripes are warmer. The coolest year was 1985, at 7.8 C (46.1 F), and the warmest was 2025, at 11.6 C (52.9 F). The strongest colour marks a difference of 2.1 C (3.8 F). 1974: 9.6 C, -0.3 C from the station mean1975: 8.7 C, -1.2 C from the station mean1976: 9.0 C, -0.9 C from the station mean1977: 9.7 C, -0.2 C from the station mean1978: 9.5 C, -0.4 C from the station mean1979: 9.7 C, -0.3 C from the station mean1980: 9.5 C, -0.4 C from the station mean1981: 10.2 C, +0.3 C from the station mean1982: 8.6 C, -1.3 C from the station mean1983: 9.7 C, -0.2 C from the station mean1984: 8.6 C, -1.3 C from the station mean1985: 7.8 C, -2.1 C from the station mean1986: 10.6 C, +0.7 C from the station mean1987: 11.2 C, +1.3 C from the station mean1988: 10.7 C, +0.7 C from the station mean1989: 9.7 C, -0.2 C from the station mean1990: 10.2 C, +0.2 C from the station mean1991: 9.8 C, -0.1 C from the station mean1992: 11.1 C, +1.2 C from the station mean1993: 8.2 C, -1.7 C from the station mean1994: 10.2 C, +0.3 C from the station mean1995: 9.8 C, -0.1 C from the station mean1996: 9.6 C, -0.3 C from the station mean1997: 9.9 C, 0.0 C from the station mean1998: 10.1 C, +0.2 C from the station mean1999: 9.9 C, 0.0 C from the station mean2000: 9.8 C, -0.1 C from the station mean2001: 10.2 C, +0.3 C from the station mean2002: 9.9 C, 0.0 C from the station mean2003: 11.2 C, +1.3 C from the station mean2004: 10.1 C, +0.2 C from the station mean2005: 9.8 C, -0.1 C from the station mean2006: 10.4 C, +0.4 C from the station mean2007: 10.4 C, +0.5 C from the station mean2008: 9.2 C, -0.7 C from the station mean2009: 9.3 C, -0.6 C from the station mean2010: 9.5 C, -0.4 C from the station mean2011: 8.9 C, -1.0 C from the station mean2012: 10.6 C, +0.7 C from the station mean2013: 9.3 C, -0.6 C from the station mean2014: 10.5 C, +0.5 C from the station mean2015: 11.1 C, +1.1 C from the station mean2016: 10.6 C, +0.7 C from the station mean2017: 9.9 C, 0.0 C from the station mean2018: 10.3 C, +0.4 C from the station mean2019: 9.4 C, -0.5 C from the station mean2020: 10.7 C, +0.8 C from the station mean2024: 11.2 C, +1.3 C from the station mean2025: 11.6 C, +1.7 C from the station mean19741980198519901995200020052010201520202025
One stripe for each of 49 complete years at Boise 7 N, 1974 to 2025. Blue stripes are years cooler than the station's own mean of 9.9 C (49.8 F); red stripes are warmer. The coolest year was 1985, at 7.8 C (46.1 F), and the warmest was 2025, at 11.6 C (52.9 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Boise 7 N as warming stripes, 1974 to 2025
YearAnnual mean temperatureDifference from the station mean
19749.6 C-0.29 C
19758.7 C-1.18 C
19769.0 C-0.87 C
19779.7 C-0.16 C
19789.5 C-0.42 C
19799.7 C-0.25 C
19809.5 C-0.37 C
198110.2 C+0.30 C
19828.6 C-1.31 C
19839.7 C-0.18 C
19848.6 C-1.29 C
19857.8 C-2.08 C
198610.6 C+0.66 C
198711.2 C+1.33 C
198810.7 C+0.75 C
19899.7 C-0.24 C
199010.2 C+0.25 C
19919.8 C-0.11 C
199211.1 C+1.17 C
19938.2 C-1.67 C
199410.2 C+0.27 C
19959.8 C-0.13 C
19969.6 C-0.31 C
19979.9 C-0.04 C
199810.1 C+0.20 C
19999.9 C-0.02 C
20009.8 C-0.11 C
200110.2 C+0.29 C
20029.9 C0.00 C
200311.2 C+1.31 C
200410.1 C+0.21 C
20059.8 C-0.13 C
200610.4 C+0.45 C
200710.4 C+0.54 C
20089.2 C-0.67 C
20099.3 C-0.58 C
20109.5 C-0.43 C
20118.9 C-1.04 C
201210.6 C+0.72 C
20139.3 C-0.58 C
201410.5 C+0.55 C
201511.1 C+1.15 C
201610.6 C+0.70 C
20179.9 C+0.04 C
201810.3 C+0.37 C
20199.4 C-0.52 C
202010.7 C+0.79 C
202411.2 C+1.31 C
202511.6 C+1.72 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.4) per decade over 1974 to 2025. In Fahrenheit: 0.4 F (0.2 to 0.7) per decade. The slope is a straight line fitted to 49 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Boise 7 N
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.2 C (0.1 to 0.4) per decade0.4 F (0.2 to 0.7) per decade1974 to 202549Rise
Mean daily maximum0.15 C (-0.03 to 0.32) per decade0.3 F (-0.1 to 0.6) per decade1974 to 202549Not clearly different from zero
Mean daily minimum0.3 C (0.2 to 0.5) per decade0.6 F (0.3 to 0.8) per decade1974 to 202549Rise

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

1973 to 2026
Yearly extremes at Boise 7 N: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)41.1 C (106.0 F)199038.3 C (100.9 F)54
Coldest night (TNn)-30.6 C (-23.1 F)1990-17.5 C (0.5 F)54
Wettest day (Rx1day)57.9 mm (2.3 in)197627.6 mm (1.1 in)54
Wettest five days (Rx5day)88.9 mm (3.5 in)201250.5 mm (2.0 in)54
Longest dry spell (CDD)105 days201243 days54

Hottest day (TXx)

Hottest day (TXx) at Boise 7 N by year The hottest day of the year at Boise 7 N, 1973 to 2026. The record is 41.1 C (106.0 F) in 1990, marked on the chart; the median year is 38.3 C (100.9 F). 20253035404519801990200020102020Record: 41.1 C (106.0 F) in 1990
The hottest day of the year at Boise 7 N, 1973 to 2026. The record is 41.1 C (106.0 F) in 1990, marked on the chart; the median year is 38.3 C (100.9 F).
Hottest day (TXx) at Boise 7 N by year
YearHottest day (TXx)
197339.4 C (102.9 F)
197438.3 C (100.9 F)
197538.9 C (102.0 F)
197637.2 C (99.0 F)
197738.9 C (102.0 F)
197838.3 C (100.9 F)
197939.4 C (102.9 F)
198040.0 C (104.0 F)
198137.8 C (100.0 F)
198237.2 C (99.0 F)
198340.6 C (105.1 F)
198437.8 C (100.0 F)
198539.4 C (102.9 F)
198640.0 C (104.0 F)
198738.3 C (100.9 F)
198838.9 C (102.0 F)
198940.6 C (105.1 F)
199041.1 C (106.0 F)
199138.3 C (100.9 F)
199240.0 C (104.0 F)
199336.7 C (98.1 F)
199437.8 C (100.0 F)
199535.6 C (96.1 F)
199637.2 C (99.0 F)
199736.1 C (97.0 F)
199838.3 C (100.9 F)
199936.1 C (97.0 F)
200037.8 C (100.0 F)
200138.3 C (100.9 F)
200240.0 C (104.0 F)
200340.0 C (104.0 F)
200437.2 C (99.0 F)
200538.3 C (100.9 F)
200638.3 C (100.9 F)
200738.9 C (102.0 F)
200837.8 C (100.0 F)
200937.8 C (100.0 F)
201036.7 C (98.1 F)
201135.6 C (96.1 F)
201238.9 C (102.0 F)
201339.4 C (102.9 F)
201436.7 C (98.1 F)
201540.0 C (104.0 F)
201636.1 C (97.0 F)
201736.7 C (98.1 F)
201840.0 C (104.0 F)
201935.0 C (95.0 F)
202036.1 C (97.0 F)
202122.2 C (72.0 F)
202231.7 C (89.1 F)
202337.2 C (99.0 F)
202439.4 C (102.9 F)
202537.8 C (100.0 F)
202638.3 C (100.9 F)

Coldest night (TNn)

Coldest night (TNn) at Boise 7 N by year The coldest night of the year at Boise 7 N, 1973 to 2026. The record is -30.6 C (-23.1 F) in 1990, marked on the chart; the median year is -17.5 C (0.5 F). -40-30-20-10019801990200020102020Record: -30.6 C (-23.1 F) in 1990
The coldest night of the year at Boise 7 N, 1973 to 2026. The record is -30.6 C (-23.1 F) in 1990, marked on the chart; the median year is -17.5 C (0.5 F).
Coldest night (TNn) at Boise 7 N by year
YearColdest night (TNn)
1973-10.6 C (12.9 F)
1974-20.6 C (-5.1 F)
1975-14.4 C (6.1 F)
1976-17.8 C (0.0 F)
1977-19.4 C (-2.9 F)
1978-21.1 C (-6.0 F)
1979-23.3 C (-9.9 F)
1980-20.0 C (-4.0 F)
1981-12.8 C (9.0 F)
1982-20.0 C (-4.0 F)
1983-26.1 C (-15.0 F)
1984-22.8 C (-9.0 F)
1985-18.9 C (-2.0 F)
1986-12.8 C (9.0 F)
1987-14.4 C (6.1 F)
1988-17.8 C (0.0 F)
1989-26.7 C (-16.1 F)
1990-30.6 C (-23.1 F)
1991-18.9 C (-2.0 F)
1992-18.9 C (-2.0 F)
1993-20.0 C (-4.0 F)
1994-13.9 C (7.0 F)
1995-13.3 C (8.1 F)
1996-20.6 C (-5.1 F)
1997-18.9 C (-2.0 F)
1998-22.8 C (-9.0 F)
1999-10.0 C (14.0 F)
2000-10.6 C (12.9 F)
2001-16.7 C (1.9 F)
2002-15.0 C (5.0 F)
2003-11.1 C (12.0 F)
2004-19.4 C (-2.9 F)
2005-17.8 C (0.0 F)
2006-15.6 C (3.9 F)
2007-15.0 C (5.0 F)
2008-17.2 C (1.0 F)
2009-20.0 C (-4.0 F)
2010-18.9 C (-2.0 F)
2011-16.1 C (3.0 F)
2012-11.7 C (10.9 F)
2013-22.8 C (-9.0 F)
2014-16.7 C (1.9 F)
2015-17.2 C (1.0 F)
2016-20.0 C (-4.0 F)
2017-23.3 C (-9.9 F)
2018-17.2 C (1.0 F)
2019-14.4 C (6.1 F)
2020-10.6 C (12.9 F)
2021-6.7 C (19.9 F)
2022-4.4 C (24.1 F)
2023-9.4 C (15.1 F)
2024-19.4 C (-2.9 F)
2025-17.2 C (1.0 F)
20260.0 C (32.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Boise 7 N by year The wettest day of the year at Boise 7 N, 1973 to 2026. The record is 57.9 mm (2.3 in) in 1976, marked on the chart; the median year is 27.6 mm (1.1 in). 020406019801990200020102020Record: 57.9 mm (2.3 in) in 1976
The wettest day of the year at Boise 7 N, 1973 to 2026. The record is 57.9 mm (2.3 in) in 1976, marked on the chart; the median year is 27.6 mm (1.1 in).
Wettest day (Rx1day) at Boise 7 N by year
YearWettest day (Rx1day)
197323.9 mm (0.9 in)
197424.6 mm (1.0 in)
197533.0 mm (1.3 in)
197657.9 mm (2.3 in)
197725.1 mm (1.0 in)
197828.4 mm (1.1 in)
197942.2 mm (1.7 in)
198049.8 mm (2.0 in)
198127.4 mm (1.1 in)
198227.2 mm (1.1 in)
198327.2 mm (1.1 in)
198435.1 mm (1.4 in)
198528.4 mm (1.1 in)
198629.0 mm (1.1 in)
198722.1 mm (0.9 in)
198828.2 mm (1.1 in)
198922.6 mm (0.9 in)
199028.2 mm (1.1 in)
199128.2 mm (1.1 in)
199217.0 mm (0.7 in)
199328.7 mm (1.1 in)
199421.1 mm (0.8 in)
199526.7 mm (1.1 in)
199634.3 mm (1.4 in)
199724.9 mm (1.0 in)
199831.5 mm (1.2 in)
199926.7 mm (1.1 in)
200029.7 mm (1.2 in)
200124.9 mm (1.0 in)
200227.7 mm (1.1 in)
200321.1 mm (0.8 in)
200431.5 mm (1.2 in)
200530.0 mm (1.2 in)
200625.9 mm (1.0 in)
200721.8 mm (0.9 in)
200826.2 mm (1.0 in)
200922.1 mm (0.9 in)
201042.2 mm (1.7 in)
201123.9 mm (0.9 in)
201250.3 mm (2.0 in)
201324.1 mm (0.9 in)
201429.7 mm (1.2 in)
201534.5 mm (1.4 in)
201621.1 mm (0.8 in)
201729.7 mm (1.2 in)
201825.9 mm (1.0 in)
201928.7 mm (1.1 in)
202038.4 mm (1.5 in)
202123.1 mm (0.9 in)
202222.6 mm (0.9 in)
202333.5 mm (1.3 in)
202435.6 mm (1.4 in)
202527.4 mm (1.1 in)
202620.8 mm (0.8 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Boise 7 N by year The wettest five days of the year at Boise 7 N, 1973 to 2026. The record is 88.9 mm (3.5 in) in 2012, marked on the chart; the median year is 50.5 mm (2.0 in). 2040608010019801990200020102020Record: 88.9 mm (3.5 in) in 2012
The wettest five days of the year at Boise 7 N, 1973 to 2026. The record is 88.9 mm (3.5 in) in 2012, marked on the chart; the median year is 50.5 mm (2.0 in).
Wettest five days (Rx5day) at Boise 7 N by year
YearWettest five days (Rx5day)
197341.8 mm (1.6 in)
197429.5 mm (1.2 in)
197551.2 mm (2.0 in)
197662.6 mm (2.5 in)
197744.5 mm (1.8 in)
197841.4 mm (1.6 in)
197950.6 mm (2.0 in)
198083.8 mm (3.3 in)
198148.7 mm (1.9 in)
198257.7 mm (2.3 in)
198348.8 mm (1.9 in)
198445.9 mm (1.8 in)
198553.4 mm (2.1 in)
198672.4 mm (2.9 in)
198729.4 mm (1.2 in)
198840.1 mm (1.6 in)
198937.8 mm (1.5 in)
199060.2 mm (2.4 in)
199149.8 mm (2.0 in)
199248.5 mm (1.9 in)
199361.8 mm (2.4 in)
199442.4 mm (1.7 in)
199550.7 mm (2.0 in)
199685.3 mm (3.4 in)
199747.6 mm (1.9 in)
199850.3 mm (2.0 in)
199940.6 mm (1.6 in)
200051.5 mm (2.0 in)
200137.6 mm (1.5 in)
200265.8 mm (2.6 in)
200358.4 mm (2.3 in)
200449.6 mm (2.0 in)
200572.7 mm (2.9 in)
200658.7 mm (2.3 in)
200732.2 mm (1.3 in)
200834.8 mm (1.4 in)
200941.5 mm (1.6 in)
201053.4 mm (2.1 in)
201153.0 mm (2.1 in)
201288.9 mm (3.5 in)
201350.8 mm (2.0 in)
201454.8 mm (2.2 in)
201552.6 mm (2.1 in)
201630.8 mm (1.2 in)
201768.8 mm (2.7 in)
201841.1 mm (1.6 in)
201963.5 mm (2.5 in)
202062.5 mm (2.5 in)
202147.5 mm (1.9 in)
202223.4 mm (0.9 in)
202344.5 mm (1.8 in)
202479.6 mm (3.1 in)
202551.2 mm (2.0 in)
202620.8 mm (0.8 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Boise 7 N by year The longest dry spell of the year at Boise 7 N, 1973 to 2026. The record is 105 days in 2012, marked on the chart; the median year is 43 days. 025507510012519801990200020102020Record: 105 days in 2012
The longest dry spell of the year at Boise 7 N, 1973 to 2026. The record is 105 days in 2012, marked on the chart; the median year is 43 days.
Longest dry spell (CDD) at Boise 7 N by year
YearLongest dry spell (CDD)
197374 days
197449 days
197538 days
197635 days
197739 days
197850 days
197951 days
198026 days
198143 days
198220 days
198328 days
198429 days
198540 days
198647 days
198779 days
198875 days
198940 days
199032 days
199171 days
199273 days
199351 days
199469 days
199535 days
199637 days
199722 days
199836 days
199959 days
200045 days
200136 days
200235 days
200355 days
200429 days
200572 days
200642 days
200781 days
200859 days
200934 days
201024 days
201177 days
2012105 days
201327 days
201440 days
201540 days
201672 days
201779 days
201857 days
201936 days
202052 days
20216 days
202231 days
202346 days
202454 days
202546 days
202624 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.

Frost Dates and Growing Season

49 years with a frost

Across 49 years with a frost, the median last spring frost at Boise 7 N falls on 21 May and the median first autumn frost on 6 October, which leaves a median of 140 days between them.

Fitted over all years, the growing season changes by +5.4 days per decade at this station.

Frost dates and growing season at Boise 7 N
MeasureMedian, all yearsEarliest periodRecent period (1993 to 2025)Recent against earliestFitted trend
Last spring frost21 Mayn/a19 Mayn/a-2.7 days per decade
First autumn frost6 Octobern/a7 Octobern/a+2.7 days per decade
Growing days140 daysn/a145 daysn/a+5.4 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.

Rainfall Return Levels

49 years, 1974 to 2025

A day with at least 27.6 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 59.8 mm (2.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Boise 7 N: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years27.6 mm (1.1 in)
5 years34.0 mm (1.3 in)
10 years39.0 mm (1.5 in)
25 years46.3 mm (1.8 in)
50 years52.7 mm (2.1 in)Longer than the 49 years of record
100 years59.8 mm (2.4 in)Longer than the 49 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, 49 years of values from 1974 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: 57.9 mm (2.3 in) in 1976; 50.3 mm (2.0 in) in 2012; 49.8 mm (2.0 in) in 1980.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Boise 7 N, at 1994. Each is measured against neighbouring stations.

  • Relative to 5 neighbouring stations, the station's annual mean temperature from 1994 ran 0.3 C (0.5 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Boise 7 N, against neighbouring stations
YearShift (C)Shift (F)StrengthNeighbours
1994-0.3-0.5likely5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Climate Twins

2008 to 2025 against 1961 to 1990

Over 2008 to 2025, Boise 7 N had a mean temperature of 10.1 C (50.2 F) and 460.0 mm (18.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Kassler (United States, 1,036 km away), Pleasant Grove (United States, 526 km away) and Denver-Stapleton (United States, 1,038 km away).

Climate twins of Boise 7 N: stations whose 1961 to 1990 climate is closest to its 2008 to 2025 climate
Twin stationCountryDistance awayMean temperature, 1961-1990Rain a year, 1961-1990Climate difference
KasslerUnited States1,036 km (644 mi)10.2 C (50.3 F)448.3 mm (17.6 in)0.89
Pleasant GroveUnited States526 km (327 mi)10.4 C (50.8 F)427.7 mm (16.8 in)0.95
Denver-StapletonUnited States1,038 km (645 mi)10.1 C (50.2 F)392.1 mm (15.4 in)0.96

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

  • Data for Boise 7 N standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Boise 7 N 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).