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Swan Lake Weather Records (USC00248087)

Record envelope, standing records and threshold days for Swan Lake (USC00248087), Montana, United States, with 77 years of record.

Key Facts for Swan Lake

  • Swan Lake (USC00248087) is a weather station in Montana, United States at 47.92 latitude and -113.84 longitude, 945 m (3,100 ft) above sea level.
  • The station reports from 1950 to 2026, 77 years of record.
  • 1,464 records set at Swan Lake still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Swan Lake set a daily record low maximum temperature of 13.9 C (57.0 F) on 9 September 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Montana, United States, 47.92 latitude, -113.84 longitude.
  • Elevation: 945 m (3,100 ft).
  • Period of record: 1950 to 2026, 77 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

17 days at or beyond a record
Daily record high and record low at Swan Lake, with 2026 drawn through them The band shows the record high and record low for each calendar day at Swan Lake. The lines show the 2026 daily maximum and minimum. 17 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 Swan Lake. The lines show the 2026 daily maximum and minimum. 17 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Swan Lake, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan14.4 C (57.9 F)-37.8 C (-36.0 F)11.7 C (53.1 F)-15.6 C (3.9 F)
Feb16.1 C (61.0 F)-33.3 C (-27.9 F)15.6 C (60.1 F)-13.3 C (8.1 F)
Mar24.4 C (75.9 F)-25.0 C (-13.0 F)20.6 C (69.1 F)-6.7 C (19.9 F)
Apr30.0 C (86.0 F)-15.0 C (5.0 F)29.4 C (84.9 F)-5.0 C (23.0 F)
May33.9 C (93.0 F)-7.8 C (18.0 F)31.1 C (88.0 F)-1.7 C (28.9 F)
Jun37.2 C (99.0 F)-4.4 C (24.1 F)30.6 C (87.1 F)0.0 C (32.0 F)
Jul38.3 C (100.9 F)-2.2 C (28.0 F)36.7 C (98.1 F)6.7 C (44.1 F)
Aug41.1 C (106.0 F)-2.8 C (27.0 F)36.7 C (98.1 F)5.6 C (42.1 F)
Sep36.7 C (98.1 F)-8.9 C (16.0 F)30.0 C (86.0 F)-1.1 C (30.0 F)
Oct28.9 C (84.0 F)-18.9 C (-2.0 F)26.7 C (80.1 F)-1.7 C (28.9 F)
Nov21.1 C (70.0 F)-23.3 C (-9.9 F)n/an/a
Dec12.8 C (55.0 F)-40.0 C (-40.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Swan Lake by the year they were set 1,464 records at Swan Lake still stand. 1985 holds the most, with 45. 02040601963: 91964: 331965: 411966: 341967: 331968: 341969: 411970: 321971: 281972: 441973: 321974: 201975: 331976: 241977: 241978: 181979: 341980: 201981: 201982: 171983: 181984: 311985: 451986: 341987: 211988: 221989: 211990: 281991: 91992: 171993: 221996: 181997: 211998: 361999: 162000: 132001: 222002: 372003: 262004: 232005: 222006: 182007: 222008: 182009: 202010: 122011: 242012: 82018: 132019: 202020: 252021: 362022: 382023: 402024: 262025: 422026: 291963196919751981198719932001200720182024
1,464 records at Swan Lake still stand. 1985 holds the most, with 45.
Standing records at Swan Lake by the year they were set
Year setStanding records
19639
196433
196541
196634
196733
196834
196941
197032
197128
197244
197332
197420
197533
197624
197724
197818
197934
198020
198120
198217
198318
198431
198545
198634
198721
198822
198921
199028
19919
199217
199322
199618
199721
199836
199916
200013
200122
200237
200326
200423
200522
200618
200722
200818
200920
201012
201124
20128
201813
201920
202025
202136
202238
202340
202426
202542
202629

All-Time Record Progression

1 new records
When Swan Lake set new all-time records 1 all-time records were set at Swan Lake between 11 August 2018 and 11 August 2018. Each dot is a new record. Record high maximum temperature11 August 2018: Record high maximum temperature 41.1 C (106.0 F)
1 all-time records were set at Swan Lake between 11 August 2018 and 11 August 2018. Each dot is a new record.
When Swan Lake set new all-time records
DateKindDetail
2018-08-11Record high maximum temperatureRecord high maximum temperature 41.1 C (106.0 F)

Wettest Day of Each Month

Jun: 86.4 mm (3.4 in)
Record daily precipitation for each month at Swan Lake The wettest day on record for each calendar month at Swan Lake. The most was 86.4 mm (3.4 in) on 8 June 1964. 0255075100 Jan: 31.8 mm (1.3 in), 10 January 2006 Jan Feb: 55.9 mm (2.2 in), 15 February 1986 Feb Mar: 39.4 mm (1.6 in), 28 March 2005 Mar Apr: 35.8 mm (1.4 in), 29 April 2010 Apr May: 78.0 mm (3.1 in), 3 May 1951 May Jun: 86.4 mm (3.4 in), 8 June 1964 Jun Jul: 74.2 mm (2.9 in), 23 July 1987 Jul Aug: 61.7 mm (2.4 in), 15 August 1968 Aug Sep: 58.4 mm (2.3 in), 5 September 1985 Sep Oct: 45.7 mm (1.8 in), 29 October 2003 Oct Nov: 50.8 mm (2.0 in), 26 November 1991 Nov Dec: 48.3 mm (1.9 in), 2 December 1981 Dec
The wettest day on record for each calendar month at Swan Lake. The most was 86.4 mm (3.4 in) on 8 June 1964.
Record daily precipitation for each month at Swan Lake
MonthRecord daily precipitation (mm)Date
Jan31.8 mm (1.3 in)10 January 2006
Feb55.9 mm (2.2 in)15 February 1986
Mar39.4 mm (1.6 in)28 March 2005
Apr35.8 mm (1.4 in)29 April 2010
May78.0 mm (3.1 in)3 May 1951
Jun86.4 mm (3.4 in)8 June 1964
Jul74.2 mm (2.9 in)23 July 1987
Aug61.7 mm (2.4 in)15 August 1968
Sep58.4 mm (2.3 in)5 September 1985
Oct45.7 mm (1.8 in)29 October 2003
Nov50.8 mm (2.0 in)26 November 1991
Dec48.3 mm (1.9 in)2 December 1981

Period of Record Coverage

1963 to 2026
Days with data per year at Swan Lake 58 years of record at Swan Lake, 1963 to 2026. 20 years have data for under 90 percent of days and are left out of rankings: 1963, 1971, 1972, 1980, 1983, 1984, 1986, 1987 and others. 1963: 131 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 365 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 327 of 365 days1972: 319 of 366 days1973: 338 of 365 days1974: 330 of 365 days1975: 330 of 365 days1976: 350 of 366 days1977: 341 of 365 days1978: 345 of 365 days1979: 346 of 365 days1980: 308 of 366 days1981: 340 of 365 days1982: 329 of 365 days1983: 269 of 365 days1984: 325 of 366 days1985: 334 of 365 days1986: 322 of 365 days1987: 303 of 365 days1988: 323 of 366 days1989: 304 of 365 days1990: 285 of 365 days1991: 305 of 365 days1992: 245 of 366 days1993: 182 of 365 days1996: 236 of 366 days1997: 337 of 365 days1998: 273 of 365 days1999: 301 of 365 days2000: 363 of 366 days2001: 364 of 365 days2002: 358 of 365 days2003: 329 of 365 days2004: 350 of 366 days2005: 358 of 365 days2006: 359 of 365 days2007: 339 of 365 days2008: 362 of 366 days2009: 361 of 365 days2010: 358 of 365 days2011: 342 of 365 days2012: 82 of 366 days2017: 3 of 365 days2018: 364 of 365 days2019: 360 of 365 days2020: 334 of 366 days2021: 358 of 365 days2022: 361 of 365 days2023: 359 of 365 days2024: 355 of 366 days2025: 354 of 365 days2026: 279 of 365 days197019801990200020102020
58 years of record at Swan Lake, 1963 to 2026. 20 years have data for under 90 percent of days and are left out of rankings: 1963, 1971, 1972, 1980, 1983, 1984, 1986, 1987 and others.
Days with data per year at Swan Lake
YearDays with dataShare of yearComplete
196313136%No
1964366100%Yes
1965365100%Yes
1966365100%Yes
1967365100%Yes
1968365100%Yes
1969365100%Yes
1970365100%Yes
197132790%No
197231987%No
197333893%Yes
197433090%Yes
197533090%Yes
197635096%Yes
197734193%Yes
197834595%Yes
197934695%Yes
198030884%No
198134093%Yes
198232990%Yes
198326974%No
198432589%No
198533492%Yes
198632288%No
198730383%No
198832388%No
198930483%No
199028578%No
199130584%No
199224567%No
199318250%No
199623664%No
199733792%Yes
199827375%No
199930182%No
200036399%Yes
2001364100%Yes
200235898%Yes
200332990%Yes
200435096%Yes
200535898%Yes
200635998%Yes
200733993%Yes
200836299%Yes
200936199%Yes
201035898%Yes
201134294%Yes
20128222%No
201731%No
2018364100%Yes
201936099%Yes
202033491%Yes
202135898%Yes
202236199%Yes
202335998%Yes
202435597%Yes
202535497%Yes
202627976%No

Latest Records

20
Latest records at Swan Lake
DateStationRecordValueBeat old record byOld record stoodSignificance
9 September 2026Swan Lake, USdaily low max (Provisional)13.9 C (57.0 F)0.5 C (0.9 F)40 years18 of 100 (Routine)
8 September 2026Swan Lake, USdaily low max (Provisional)12.2 C (54.0 F)1.7 C (3.1 F)24 years15 of 100 (Routine)
27 August 2026Swan Lake, USdaily high max (Provisional)35.6 C (96.1 F)1.2 C (2.2 F)16 years12 of 100 (Routine)
27 August 2026Swan Lake, USdaily high min (Provisional)11.1 C (52.0 F)0.5 C (0.9 F)4 years9 of 100 (Routine)
14 August 2026Swan Lake, USdaily high min13.9 C (57.0 F)1.7 C (3.1 F)47 years26 of 100 (Routine)
5 August 2026Swan Lake, USdaily high max36.7 C (98.1 F)1.7 C (3.1 F)28 years17 of 100 (Routine)
4 August 2026Swan Lake, USdaily high max36.7 C (98.1 F)1.1 C (2.0 F)27 years16 of 100 (Routine)
26 July 2026Swan Lake, USdaily high max35.6 C (96.1 F)1.2 C (2.2 F)28 years16 of 100 (Routine)
18 July 2026Swan Lake, USdaily high min14.4 C (57.9 F)0.5 C (0.9 F)28 years16 of 100 (Routine)
18 July 2026Swan Lake, USdaily high max (Tie)36.1 C (97.0 F)tie1 year1 of 100 (Routine)
15 July 2026Swan Lake, USdaily high min13.9 C (57.0 F)2.2 C (4.0 F)19 years18 of 100 (Routine)
30 May 2026Swan Lake, USdaily high min9.4 C (48.9 F)0.5 C (0.9 F)56 years25 of 100 (Routine)
29 May 2026Swan Lake, USdaily high min11.1 C (52.0 F)0.5 C (0.9 F)3 years8 of 100 (Routine)
28 May 2026Swan Lake, USdaily high min11.7 C (53.1 F)0.6 C (1.1 F)3 years8 of 100 (Routine)
27 May 2026Swan Lake, USdaily high min (Tie)10.6 C (51.1 F)tie3 years1 of 100 (Routine)
22 April 2026Swan Lake, USdaily high max29.4 C (84.9 F)2.7 C (4.9 F)56 years27 of 100 (Routine)
20 April 2026Swan Lake, USdaily high max (Tie)22.2 C (72.0 F)tie36 years4 of 100 (Routine)
17 April 2026Swan Lake, USdaily low max2.2 C (36.0 F)1.1 C (2.0 F)48 years22 of 100 (Routine)
15 April 2026Swan Lake, USdaily high min (Tie)3.9 C (39.0 F)tie60 years6 of 100 (Routine)
14 April 2026Swan Lake, USdaily high min6.7 C (44.1 F)2.3 C (4.1 F)36 years24 of 100 (Routine)

Climate Trend

37 complete years, 1964 to 2025
Annual mean temperature at Swan Lake as warming stripes, 1964 to 2025 One stripe for each of 37 complete years at Swan Lake, 1964 to 2025. Blue stripes are years cooler than the station's own mean of 6.1 C (43.0 F); red stripes are warmer. The coolest year was 1985, at 4.3 C (39.8 F), and the warmest was 2025, at 8.3 C (47.0 F). The strongest colour marks a difference of 2.3 C (4.1 F). 1964: 5.7 C, -0.5 C from the station mean1965: 5.9 C, -0.2 C from the station mean1966: 6.5 C, +0.4 C from the station mean1967: 6.9 C, +0.8 C from the station mean1968: 5.9 C, -0.2 C from the station mean1969: 5.7 C, -0.4 C from the station mean1970: 5.7 C, -0.4 C from the station mean1973: 5.7 C, -0.4 C from the station mean1976: 6.1 C, 0.0 C from the station mean1977: 5.6 C, -0.5 C from the station mean1978: 4.9 C, -1.2 C from the station mean1979: 4.9 C, -1.2 C from the station mean1981: 6.3 C, +0.2 C from the station mean1982: 5.0 C, -1.1 C from the station mean1984: 5.6 C, -0.6 C from the station mean1985: 4.3 C, -1.8 C from the station mean1986: 6.3 C, +0.2 C from the station mean1987: 6.5 C, +0.4 C from the station mean1988: 6.5 C, +0.4 C from the station mean2000: 5.8 C, -0.3 C from the station mean2001: 6.2 C, +0.1 C from the station mean2002: 5.4 C, -0.7 C from the station mean2004: 6.4 C, +0.2 C from the station mean2005: 5.8 C, -0.3 C from the station mean2006: 6.3 C, +0.2 C from the station mean2007: 6.1 C, 0.0 C from the station mean2008: 5.4 C, -0.7 C from the station mean2009: 5.4 C, -0.7 C from the station mean2010: 5.8 C, -0.3 C from the station mean2011: 5.1 C, -1.0 C from the station mean2018: 7.1 C, +1.0 C from the station mean2019: 6.3 C, +0.2 C from the station mean2021: 7.7 C, +1.5 C from the station mean2022: 6.8 C, +0.7 C from the station mean2023: 7.7 C, +1.6 C from the station mean2024: 8.3 C, +2.2 C from the station mean2025: 8.3 C, +2.2 C from the station mean1964197019801990200020102020
One stripe for each of 37 complete years at Swan Lake, 1964 to 2025. Blue stripes are years cooler than the station's own mean of 6.1 C (43.0 F); red stripes are warmer. The coolest year was 1985, at 4.3 C (39.8 F), and the warmest was 2025, at 8.3 C (47.0 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Swan Lake as warming stripes, 1964 to 2025
YearAnnual mean temperatureDifference from the station mean
19645.7 C-0.46 C
19655.9 C-0.25 C
19666.5 C+0.43 C
19676.9 C+0.83 C
19685.9 C-0.23 C
19695.7 C-0.37 C
19705.7 C-0.42 C
19735.7 C-0.40 C
19766.1 C-0.01 C
19775.6 C-0.47 C
19784.9 C-1.17 C
19794.9 C-1.24 C
19816.3 C+0.17 C
19825.0 C-1.10 C
19845.6 C-0.56 C
19854.3 C-1.80 C
19866.3 C+0.23 C
19876.5 C+0.42 C
19886.5 C+0.40 C
20005.8 C-0.34 C
20016.2 C+0.09 C
20025.4 C-0.69 C
20046.4 C+0.24 C
20055.8 C-0.30 C
20066.3 C+0.15 C
20076.1 C+0.03 C
20085.4 C-0.70 C
20095.4 C-0.68 C
20105.8 C-0.27 C
20115.1 C-0.99 C
20187.1 C+0.96 C
20196.3 C+0.22 C
20217.7 C+1.54 C
20226.8 C+0.70 C
20237.7 C+1.62 C
20248.3 C+2.16 C
20258.3 C+2.21 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.4) per decade over 1964 to 2025. In Fahrenheit: 0.4 F (0.2 to 0.6) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Swan Lake
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 0.6) per decade1964 to 202537Rise
Mean daily maximum0.2 C (0.0 to 0.4) per decade0.3 F (0.0 to 0.6) per decade1964 to 202537Not clearly different from zero
Mean daily minimum0.3 C (0.1 to 0.4) per decade0.5 F (0.3 to 0.7) per decade1964 to 202537Rise

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

1950 to 2026
Yearly extremes at Swan Lake: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)41.1 C (106.0 F)201834.7 C (94.5 F)58
Coldest night (TNn)-40.0 C (-40.0 F)1968-26.7 C (-16.1 F)59
Wettest day (Rx1day)86.4 mm (3.4 in)196434.3 mm (1.4 in)50
Wettest five days (Rx5day)115.3 mm (4.5 in)200556.9 mm (2.2 in)50
Longest dry spell (CDD)57 days196922 days50

Hottest day (TXx)

Hottest day (TXx) at Swan Lake by year The hottest day of the year at Swan Lake, 1950 to 2026. The record is 41.1 C (106.0 F) in 2018, marked on the chart; the median year is 34.7 C (94.5 F). 02040601960198020002020Record: 41.1 C (106.0 F) in 2018
The hottest day of the year at Swan Lake, 1950 to 2026. The record is 41.1 C (106.0 F) in 2018, marked on the chart; the median year is 34.7 C (94.5 F).
Hottest day (TXx) at Swan Lake by year
YearHottest day (TXx)
1950n/a
1951n/a
196332.2 C (90.0 F)
196434.4 C (93.9 F)
196535.0 C (95.0 F)
196634.4 C (93.9 F)
196737.8 C (100.0 F)
196834.4 C (93.9 F)
196939.4 C (102.9 F)
197036.7 C (98.1 F)
197134.4 C (93.9 F)
197231.7 C (89.1 F)
197335.6 C (96.1 F)
197435.0 C (95.0 F)
197534.4 C (93.9 F)
197632.2 C (90.0 F)
197732.2 C (90.0 F)
197831.1 C (88.0 F)
197933.9 C (93.0 F)
198031.1 C (88.0 F)
198133.3 C (91.9 F)
198232.2 C (90.0 F)
198332.8 C (91.0 F)
198433.9 C (93.0 F)
198535.0 C (95.0 F)
198633.3 C (91.9 F)
198733.3 C (91.9 F)
198833.3 C (91.9 F)
198933.9 C (93.0 F)
199034.4 C (93.9 F)
199132.8 C (91.0 F)
199234.4 C (93.9 F)
199332.8 C (91.0 F)
199635.6 C (96.1 F)
199735.0 C (95.0 F)
199836.7 C (98.1 F)
199935.6 C (96.1 F)
200036.1 C (97.0 F)
200136.7 C (98.1 F)
200237.8 C (100.0 F)
200337.2 C (99.0 F)
200435.6 C (96.1 F)
200536.7 C (98.1 F)
200636.7 C (98.1 F)
200737.8 C (100.0 F)
200836.7 C (98.1 F)
200934.4 C (93.9 F)
201034.4 C (93.9 F)
201134.4 C (93.9 F)
20127.8 C (46.0 F)
20170.6 C (33.1 F)
201841.1 C (106.0 F)
201935.6 C (96.1 F)
202038.3 C (100.9 F)
202138.3 C (100.9 F)
202237.8 C (100.0 F)
202338.3 C (100.9 F)
202437.2 C (99.0 F)
202536.1 C (97.0 F)
202636.7 C (98.1 F)

Coldest night (TNn)

Coldest night (TNn) at Swan Lake by year The coldest night of the year at Swan Lake, 1950 to 2026. The record is -40.0 C (-40.0 F) in 1968, marked on the chart; the median year is -26.7 C (-16.1 F). -40-200201960198020002020Record: -40.0 C (-40.0 F) in 1968
The coldest night of the year at Swan Lake, 1950 to 2026. The record is -40.0 C (-40.0 F) in 1968, marked on the chart; the median year is -26.7 C (-16.1 F).
Coldest night (TNn) at Swan Lake by year
YearColdest night (TNn)
1950n/a
19510.6 C (33.1 F)
1963-20.6 C (-5.1 F)
1964-38.9 C (-38.0 F)
1965-25.0 C (-13.0 F)
1966-24.4 C (-11.9 F)
1967-20.6 C (-5.1 F)
1968-40.0 C (-40.0 F)
1969-27.8 C (-18.0 F)
1970-28.9 C (-20.0 F)
1971-25.6 C (-14.1 F)
1972-34.4 C (-29.9 F)
1973-31.7 C (-25.1 F)
1974-30.0 C (-22.0 F)
1975-27.2 C (-17.0 F)
1976-26.7 C (-16.1 F)
1977-27.2 C (-17.0 F)
1978-35.6 C (-32.1 F)
1979-37.8 C (-36.0 F)
1980-32.8 C (-27.0 F)
1981-32.8 C (-27.0 F)
1982-32.8 C (-27.0 F)
1983-35.6 C (-32.1 F)
1984-25.6 C (-14.1 F)
1985-33.3 C (-27.9 F)
1986-21.1 C (-6.0 F)
1987-24.4 C (-11.9 F)
1988-27.2 C (-17.0 F)
1989-25.0 C (-13.0 F)
1990-37.2 C (-35.0 F)
1991-25.6 C (-14.1 F)
1992-21.1 C (-6.0 F)
1993-30.6 C (-23.1 F)
1996-24.4 C (-11.9 F)
1997-27.2 C (-17.0 F)
1998-28.9 C (-20.0 F)
1999-18.9 C (-2.0 F)
2000-23.9 C (-11.0 F)
2001-20.0 C (-4.0 F)
2002-23.3 C (-9.9 F)
2003-22.2 C (-8.0 F)
2004-33.9 C (-29.0 F)
2005-28.3 C (-18.9 F)
2006-30.0 C (-22.0 F)
2007-23.9 C (-11.0 F)
2008-30.0 C (-22.0 F)
2009-26.7 C (-16.1 F)
2010-26.1 C (-15.0 F)
2011-28.3 C (-18.9 F)
2012-15.6 C (3.9 F)
2017-14.4 C (6.1 F)
2018-21.7 C (-7.1 F)
2019-26.7 C (-16.1 F)
2020-16.7 C (1.9 F)
2021-27.8 C (-18.0 F)
2022-25.0 C (-13.0 F)
2023-25.0 C (-13.0 F)
2024-25.6 C (-14.1 F)
2025-26.7 C (-16.1 F)
2026-15.6 C (3.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Swan Lake by year The wettest day of the year at Swan Lake, 1950 to 2026. The record is 86.4 mm (3.4 in) in 1964, marked on the chart; the median year is 34.3 mm (1.4 in). 0204060801001960198020002020Record: 86.4 mm (3.4 in) in 1964
The wettest day of the year at Swan Lake, 1950 to 2026. The record is 86.4 mm (3.4 in) in 1964, marked on the chart; the median year is 34.3 mm (1.4 in).
Wettest day (Rx1day) at Swan Lake by year
YearWettest day (Rx1day)
195020.3 mm (0.8 in)
195178.0 mm (3.1 in)
196327.9 mm (1.1 in)
196486.4 mm (3.4 in)
196558.4 mm (2.3 in)
196647.2 mm (1.9 in)
196724.6 mm (1.0 in)
196861.7 mm (2.4 in)
196930.0 mm (1.2 in)
197033.0 mm (1.3 in)
197127.7 mm (1.1 in)
197230.7 mm (1.2 in)
197323.1 mm (0.9 in)
197419.8 mm (0.8 in)
197551.3 mm (2.0 in)
197643.2 mm (1.7 in)
197724.1 mm (0.9 in)
197833.8 mm (1.3 in)
197945.7 mm (1.8 in)
198040.1 mm (1.6 in)
198148.3 mm (1.9 in)
198235.1 mm (1.4 in)
198327.2 mm (1.1 in)
198439.9 mm (1.6 in)
198562.0 mm (2.4 in)
198655.9 mm (2.2 in)
198774.2 mm (2.9 in)
198843.4 mm (1.7 in)
198943.2 mm (1.7 in)
199029.7 mm (1.2 in)
199150.8 mm (2.0 in)
199240.6 mm (1.6 in)
199337.1 mm (1.5 in)
199640.6 mm (1.6 in)
199725.9 mm (1.0 in)
199830.5 mm (1.2 in)
199927.7 mm (1.1 in)
200020.6 mm (0.8 in)
200131.8 mm (1.3 in)
200227.2 mm (1.1 in)
200345.7 mm (1.8 in)
200420.3 mm (0.8 in)
200546.5 mm (1.8 in)
200632.5 mm (1.3 in)
200734.8 mm (1.4 in)
200828.7 mm (1.1 in)
200927.2 mm (1.1 in)
201038.1 mm (1.5 in)
201133.3 mm (1.3 in)
20127.6 mm (0.30 in)
2017n/a
2018n/a
2019n/a
2020n/a
2021n/a
2022n/a
2023n/a
2024n/a
2025n/a
2026n/a

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Swan Lake by year The wettest five days of the year at Swan Lake, 1950 to 2026. The record is 115.3 mm (4.5 in) in 2005, marked on the chart; the median year is 56.9 mm (2.2 in). 02550751001251960198020002020Record: 115.3 mm (4.5 in) in 2005
The wettest five days of the year at Swan Lake, 1950 to 2026. The record is 115.3 mm (4.5 in) in 2005, marked on the chart; the median year is 56.9 mm (2.2 in).
Wettest five days (Rx5day) at Swan Lake by year
YearWettest five days (Rx5day)
195048.2 mm (1.9 in)
195182.9 mm (3.3 in)
196336.5 mm (1.4 in)
196499.9 mm (3.9 in)
1965112.9 mm (4.4 in)
196682.2 mm (3.2 in)
196751.0 mm (2.0 in)
196890.3 mm (3.6 in)
196983.4 mm (3.3 in)
197082.8 mm (3.3 in)
197157.4 mm (2.3 in)
197256.1 mm (2.2 in)
197377.3 mm (3.0 in)
197456.9 mm (2.2 in)
197562.3 mm (2.5 in)
197667.3 mm (2.6 in)
197740.3 mm (1.6 in)
197868.1 mm (2.7 in)
197945.7 mm (1.8 in)
198064.5 mm (2.5 in)
198172.2 mm (2.8 in)
198250.6 mm (2.0 in)
198331.2 mm (1.2 in)
198451.3 mm (2.0 in)
198597.3 mm (3.8 in)
198659.9 mm (2.4 in)
198774.7 mm (2.9 in)
198851.1 mm (2.0 in)
198963.4 mm (2.5 in)
199055.3 mm (2.2 in)
199150.9 mm (2.0 in)
199263.2 mm (2.5 in)
199338.1 mm (1.5 in)
199680.5 mm (3.2 in)
199763.9 mm (2.5 in)
199850.6 mm (2.0 in)
199946.5 mm (1.8 in)
200031.7 mm (1.2 in)
200139.1 mm (1.5 in)
200241.7 mm (1.6 in)
200347.7 mm (1.9 in)
200442.3 mm (1.7 in)
2005115.3 mm (4.5 in)
200671.2 mm (2.8 in)
200753.9 mm (2.1 in)
200860.8 mm (2.4 in)
200951.2 mm (2.0 in)
201056.9 mm (2.2 in)
201150.8 mm (2.0 in)
201216.4 mm (0.6 in)
2017n/a
2018n/a
2019n/a
2020n/a
2021n/a
2022n/a
2023n/a
2024n/a
2025n/a
2026n/a

Longest dry spell (CDD)

Longest dry spell (CDD) at Swan Lake by year The longest dry spell of the year at Swan Lake, 1950 to 2026. The record is 57 days in 1969, marked on the chart; the median year is 22 days. 02040601960198020002020Record: 57 days in 1969
The longest dry spell of the year at Swan Lake, 1950 to 2026. The record is 57 days in 1969, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Swan Lake by year
YearLongest dry spell (CDD)
195021 days
195117 days
196316 days
196422 days
196520 days
196612 days
196745 days
196820 days
196957 days
197032 days
197122 days
197215 days
197335 days
197418 days
197523 days
197616 days
197732 days
197831 days
197933 days
198016 days
198126 days
198215 days
198316 days
198432 days
198532 days
198621 days
198733 days
198825 days
198920 days
199020 days
199137 days
199216 days
199324 days
199617 days
199722 days
199819 days
199918 days
200035 days
200132 days
200226 days
200331 days
200417 days
200524 days
200628 days
200717 days
200820 days
200921 days
201017 days
201140 days
201214 days
2017n/a
2018n/a
2019n/a
2020n/a
2021n/a
2022n/a
2023n/a
2024n/a
2025n/a
2026n/a

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

37 years with a frost

Across 37 years with a frost, the median last spring frost at Swan Lake falls on 5 June and the median first autumn frost on 3 September, which leaves a median of 91 days between them.

Fitted over all years, the growing season changes by +11.1 days per decade at this station.

Frost dates and growing season at Swan Lake
MeasureMedian, all yearsEarliest periodRecent period (1973 to 2025)Recent against earliestFitted trend
Last spring frost5 Junen/a3 Junen/a-4.3 days per decade
First autumn frost3 Septembern/a7 Septembern/a+6.8 days per decade
Growing days91 daysn/a93 daysn/a+11.1 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 Swan Lake standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Swan Lake 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 (2026-10-14).