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Lewistown 11 SSE Weather Records (USC00244978)

Record envelope, standing records and threshold days for Lewistown 11 SSE (USC00244978), Montana, United States, with 78 years of record.

Key Facts for Lewistown 11 SSE

  • Lewistown 11 SSE (USC00244978) is a weather station in Montana, United States at 46.91 latitude and -109.41 longitude, 1,513 m (4,965 ft) above sea level.
  • The station reports from 1949 to 2026, 78 years of record.
  • 1,464 records set at Lewistown 11 SSE still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Lewistown 11 SSE set a daily record precipitation of 33.5 mm (1.3 in) on 15 July 2026.

About the Station

  • Location: Montana, United States, 46.91 latitude, -109.41 longitude.
  • Elevation: 1,513 m (4,965 ft).
  • Period of record: 1949 to 2026, 78 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

26 days at or beyond a record
Daily record high and record low at Lewistown 11 SSE, with 2026 drawn through them The band shows the record high and record low for each calendar day at Lewistown 11 SSE. The lines show the 2026 daily maximum and minimum. 26 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Lewistown 11 SSE. The lines show the 2026 daily maximum and minimum. 26 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Lewistown 11 SSE, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan18.3 C (64.9 F)-38.9 C (-38.0 F)14.4 C (57.9 F)-26.1 C (-15.0 F)
Feb20.0 C (68.0 F)-37.8 C (-36.0 F)18.9 C (66.0 F)-22.8 C (-9.0 F)
Mar22.2 C (72.0 F)-37.2 C (-35.0 F)20.0 C (68.0 F)-25.0 C (-13.0 F)
Apr28.3 C (82.9 F)-22.2 C (-8.0 F)25.0 C (77.0 F)-12.8 C (9.0 F)
May30.6 C (87.1 F)-11.7 C (10.9 F)28.3 C (82.9 F)-7.8 C (18.0 F)
Jun33.9 C (93.0 F)-2.2 C (28.0 F)25.6 C (78.1 F)1.1 C (34.0 F)
Jul37.8 C (100.0 F)-1.7 C (28.9 F)36.7 C (98.1 F)6.7 C (44.1 F)
Aug38.3 C (100.9 F)0.0 C (32.0 F)34.4 C (93.9 F)2.8 C (37.0 F)
Sep35.0 C (95.0 F)-7.8 C (18.0 F)27.8 C (82.0 F)-2.8 C (27.0 F)
Oct31.7 C (89.1 F)-22.8 C (-9.0 F)28.3 C (82.9 F)2.8 C (37.0 F)
Nov23.3 C (73.9 F)-30.6 C (-23.1 F)n/an/a
Dec18.3 C (64.9 F)-36.7 C (-34.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Lewistown 11 SSE by the year they were set 1,464 records at Lewistown 11 SSE still stand. 1950 holds the most, with 98. 02550751001949: 571950: 981951: 901952: 561953: 781954: 841955: 791956: 601957: 642010: 12011: 432012: 412013: 392014: 402015: 602016: 592017: 472018: 322019: 472020: 552021: 742022: 632023: 482024: 572025: 462026: 46194919521955201020132016201920222025
1,464 records at Lewistown 11 SSE still stand. 1950 holds the most, with 98.
Standing records at Lewistown 11 SSE by the year they were set
Year setStanding records
194957
195098
195190
195256
195378
195484
195579
195660
195764
20101
201143
201241
201339
201440
201560
201659
201747
201832
201947
202055
202174
202263
202348
202457
202546
202646

All-Time Record Progression

3 new records
When Lewistown 11 SSE set new all-time records 3 all-time records were set at Lewistown 11 SSE between 3 August 1985 and 23 August 2014. Each dot is a new record. Record daily precipitationRecord daily snowfall3 August 1985: Record daily precipitation 91.2 mm (3.6 in)22 March 1987: Record daily snowfall 61.0 cm (24.0 in)23 August 2014: Record daily precipitation 108.0 mm (4.3 in)1985199019952000200520102015
3 all-time records were set at Lewistown 11 SSE between 3 August 1985 and 23 August 2014. Each dot is a new record.
When Lewistown 11 SSE set new all-time records
DateKindDetail
1985-08-03Record daily precipitationRecord daily precipitation 91.2 mm (3.6 in)
1987-03-22Record daily snowfallRecord daily snowfall 61.0 cm (24.0 in)
2014-08-23Record daily precipitationRecord daily precipitation 108.0 mm (4.3 in)

Wettest Day of Each Month

Aug: 108.0 mm (4.3 in)
Record daily precipitation for each month at Lewistown 11 SSE The wettest day on record for each calendar month at Lewistown 11 SSE. The most was 108.0 mm (4.3 in) on 23 August 2014. 050100150 Jan: 22.4 mm (0.9 in), 18 January 1975 Jan Feb: 21.8 mm (0.9 in), 9 February 2026 Feb Mar: 35.6 mm (1.4 in), 14 March 2026 Mar Apr: 39.4 mm (1.6 in), 27 April 2012 Apr May: 77.7 mm (3.1 in), 29 May 1982 May Jun: 90.2 mm (3.6 in), 3 June 2023 Jun Jul: 56.1 mm (2.2 in), 4 July 1993 Jul Aug: 108.0 mm (4.3 in), 23 August 2014 Aug Sep: 88.9 mm (3.5 in), 12 September 1978 Sep Oct: 48.3 mm (1.9 in), 7 October 2011 Oct Nov: 24.9 mm (1.0 in), 18 November 2007 Nov Dec: 29.5 mm (1.2 in), 26 December 2003 Dec
The wettest day on record for each calendar month at Lewistown 11 SSE. The most was 108.0 mm (4.3 in) on 23 August 2014.
Record daily precipitation for each month at Lewistown 11 SSE
MonthRecord daily precipitation (mm)Date
Jan22.4 mm (0.9 in)18 January 1975
Feb21.8 mm (0.9 in)9 February 2026
Mar35.6 mm (1.4 in)14 March 2026
Apr39.4 mm (1.6 in)27 April 2012
May77.7 mm (3.1 in)29 May 1982
Jun90.2 mm (3.6 in)3 June 2023
Jul56.1 mm (2.2 in)4 July 1993
Aug108.0 mm (4.3 in)23 August 2014
Sep88.9 mm (3.5 in)12 September 1978
Oct48.3 mm (1.9 in)7 October 2011
Nov24.9 mm (1.0 in)18 November 2007
Dec29.5 mm (1.2 in)26 December 2003

Period of Record Coverage

1949 to 2026
Days with data per year at Lewistown 11 SSE 26 years of record at Lewistown 11 SSE, 1949 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1949, 2010, 2012, 2015, 2017, 2026. 1949: 243 of 365 days1950: 365 of 365 days1951: 363 of 365 days1952: 365 of 366 days1953: 365 of 365 days1954: 362 of 365 days1955: 364 of 365 days1956: 366 of 366 days1957: 365 of 365 days2010: 29 of 365 days2011: 345 of 365 days2012: 324 of 366 days2013: 364 of 365 days2014: 362 of 365 days2015: 318 of 365 days2016: 366 of 366 days2017: 299 of 365 days2018: 365 of 365 days2019: 354 of 365 days2020: 362 of 366 days2021: 355 of 365 days2022: 363 of 365 days2023: 359 of 365 days2024: 365 of 366 days2025: 364 of 365 days2026: 277 of 365 days195019552010201520202025
26 years of record at Lewistown 11 SSE, 1949 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1949, 2010, 2012, 2015, 2017, 2026.
Days with data per year at Lewistown 11 SSE
YearDays with dataShare of yearComplete
194924367%No
1950365100%Yes
195136399%Yes
1952365100%Yes
1953365100%Yes
195436299%Yes
1955364100%Yes
1956366100%Yes
1957365100%Yes
2010298%No
201134595%Yes
201232489%No
2013364100%Yes
201436299%Yes
201531887%No
2016366100%Yes
201729982%No
2018365100%Yes
201935497%Yes
202036299%Yes
202135597%Yes
202236399%Yes
202335998%Yes
2024365100%Yes
2025364100%Yes
202627776%No

Latest Records

20
Latest records at Lewistown 11 SSE
DateStationRecordValueBeat old record byOld record stoodSignificance
15 July 2026Lewistown 11 SSE, USdaily rain33.5 mm (1.3 in)15.0 mm (0.6 in)64 years46 of 100 (Notable)
15 March 2026Lewistown 11 SSE, USdaily snow depth81.3 cm (32.0 in)50.8 cm (20.0 in)73 years69 of 100 (Major)
15 March 2026Lewistown 11 SSE, USdaily rain8.4 mm (0.33 in)4.3 mm (0.17 in)29 years20 of 100 (Routine)
14 March 2026Lewistown 11 SSE, USdaily snow depth71.1 cm (28.0 in)40.6 cm (16.0 in)73 years61 of 100 (Major)
14 March 2026Lewistown 11 SSE, USmonthly rain35.6 mm (1.4 in)3.1 mm (0.12 in)45 years37 of 100 (Notable)
14 March 2026Lewistown 11 SSE, USdaily snowfall38.1 cm (15.0 in)2.5 cm (1.0 in)36 years20 of 100 (Routine)
13 March 2026Lewistown 11 SSE, USdaily rain25.4 mm (1.0 in)19.6 mm (0.8 in)52 years62 of 100 (Major)
13 March 2026Lewistown 11 SSE, USdaily snow depth33.0 cm (13.0 in)2.5 cm (1.0 in)73 years31 of 100 (Routine)
6 March 2026Lewistown 11 SSE, USdaily rain10.2 mm (0.4 in)0.5 mm (0.02 in)76 years20 of 100 (Routine)
9 February 2026Lewistown 11 SSE, USmonthly rain21.8 mm (0.9 in)1.5 mm (0.06 in)9 years20 of 100 (Routine)
9 February 2026Lewistown 11 SSE, USmonthly snowfall (Tie)30.5 cm (12.0 in)tie19 years5 of 100 (Routine)
13 December 2025Lewistown 11 SSE, USdaily snow depth33.0 cm (13.0 in)12.7 cm (5.0 in)67 years39 of 100 (Notable)
12 December 2025Lewistown 11 SSE, USdaily rain16.8 mm (0.7 in)5.4 mm (0.21 in)67 years20 of 100 (Routine)
7 December 2025Lewistown 11 SSE, USdaily snow depth (Tie)25.4 cm (10.0 in)tie54 years5 of 100 (Routine)
6 December 2025Lewistown 11 SSE, USdaily snow depth25.4 cm (10.0 in)2.5 cm (1.0 in)3 years9 of 100 (Routine)
5 December 2025Lewistown 11 SSE, USdaily snow depth25.4 cm (10.0 in)5.1 cm (2.0 in)8 years13 of 100 (Routine)
3 December 2025Lewistown 11 SSE, USdaily snow depth (Tie)25.4 cm (10.0 in)tie8 years2 of 100 (Routine)
21 October 2025Lewistown 11 SSE, USdaily rain11.9 mm (0.5 in)2.2 mm (0.09 in)50 years20 of 100 (Routine)
28 July 2025Lewistown 11 SSE, USdaily rain41.9 mm (1.6 in)17.8 mm (0.7 in)36 years41 of 100 (Notable)
23 July 2025Lewistown 11 SSE, USdaily rain14.0 mm (0.6 in)3.1 mm (0.12 in)23 years17 of 100 (Routine)

Climate Trend

19 complete years, 1950 to 2025
Annual mean temperature at Lewistown 11 SSE as warming stripes, 1950 to 2025 One stripe for each of 19 complete years at Lewistown 11 SSE, 1950 to 2025. Blue stripes are years cooler than the station's own mean of 5.2 C (41.3 F); red stripes are warmer. The coolest year was 1951, at 3.2 C (37.7 F), and the warmest was 1953, at 7.2 C (45.0 F). The strongest colour marks a difference of 2.1 C (3.8 F). 1950: 4.0 C, -1.2 C from the station mean1951: 3.2 C, -2.0 C from the station mean1952: 5.9 C, +0.7 C from the station mean1953: 7.2 C, +2.0 C from the station mean1954: 5.9 C, +0.7 C from the station mean1955: 4.3 C, -0.9 C from the station mean1956: 6.1 C, +0.9 C from the station mean1957: 5.3 C, +0.1 C from the station mean2011: 4.3 C, -0.9 C from the station mean2013: 5.1 C, -0.1 C from the station mean2014: 4.8 C, -0.4 C from the station mean2016: 6.2 C, +1.0 C from the station mean2018: 4.6 C, -0.6 C from the station mean2019: 3.5 C, -1.6 C from the station mean2020: 5.5 C, +0.3 C from the station mean2022: 4.5 C, -0.7 C from the station mean2023: 5.8 C, +0.6 C from the station mean2024: 6.1 C, +1.0 C from the station mean2025: 6.3 C, +1.1 C from the station mean19501960197019801990200020102020
One stripe for each of 19 complete years at Lewistown 11 SSE, 1950 to 2025. Blue stripes are years cooler than the station's own mean of 5.2 C (41.3 F); red stripes are warmer. The coolest year was 1951, at 3.2 C (37.7 F), and the warmest was 1953, at 7.2 C (45.0 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Lewistown 11 SSE as warming stripes, 1950 to 2025
YearAnnual mean temperatureDifference from the station mean
19504.0 C-1.19 C
19513.2 C-1.99 C
19525.9 C+0.72 C
19537.2 C+2.03 C
19545.9 C+0.69 C
19554.3 C-0.92 C
19566.1 C+0.88 C
19575.3 C+0.14 C
20114.3 C-0.88 C
20135.1 C-0.13 C
20144.8 C-0.43 C
20166.2 C+1.01 C
20184.6 C-0.59 C
20193.5 C-1.64 C
20205.5 C+0.30 C
20224.5 C-0.69 C
20235.8 C+0.60 C
20246.1 C+0.96 C
20256.3 C+1.08 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1949 to 2026
Yearly extremes at Lewistown 11 SSE: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)38.3 C (100.9 F)194934.4 C (93.9 F)26
Coldest night (TNn)-38.9 C (-38.0 F)2024-33.0 C (-27.5 F)26
Wettest day (Rx1day)108.0 mm (4.3 in)201441.2 mm (1.6 in)78
Wettest five days (Rx5day)182.1 mm (7.2 in)200871.4 mm (2.8 in)78
Longest dry spell (CDD)50 days195123 days78

Hottest day (TXx)

Hottest day (TXx) at Lewistown 11 SSE by year The hottest day of the year at Lewistown 11 SSE, 1949 to 2026. The record is 38.3 C (100.9 F) in 1949, marked on the chart; the median year is 34.4 C (93.9 F). 102030401960198020002020Record: 38.3 C (100.9 F) in 1949
The hottest day of the year at Lewistown 11 SSE, 1949 to 2026. The record is 38.3 C (100.9 F) in 1949, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Lewistown 11 SSE by year
YearHottest day (TXx)
194938.3 C (100.9 F)
195033.3 C (91.9 F)
195135.0 C (95.0 F)
195234.4 C (93.9 F)
195337.2 C (99.0 F)
195435.6 C (96.1 F)
195537.8 C (100.0 F)
195635.0 C (95.0 F)
195736.7 C (98.1 F)
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963n/a
1964n/a
1965n/a
1966n/a
1967n/a
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
1981n/a
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
2008n/a
2009n/a
201012.2 C (54.0 F)
201134.4 C (93.9 F)
201234.4 C (93.9 F)
201333.9 C (93.0 F)
201433.3 C (91.9 F)
201533.3 C (91.9 F)
201633.3 C (91.9 F)
201733.3 C (91.9 F)
201836.7 C (98.1 F)
201931.7 C (89.1 F)
202033.9 C (93.0 F)
202133.9 C (93.0 F)
202235.0 C (95.0 F)
202333.9 C (93.0 F)
202435.0 C (95.0 F)
202531.7 C (89.1 F)
202636.7 C (98.1 F)

Coldest night (TNn)

Coldest night (TNn) at Lewistown 11 SSE by year The coldest night of the year at Lewistown 11 SSE, 1949 to 2026. The record is -38.9 C (-38.0 F) in 2024, marked on the chart; the median year is -33.0 C (-27.5 F). -40-35-30-25-201960198020002020Record: -38.9 C (-38.0 F) in 2024
The coldest night of the year at Lewistown 11 SSE, 1949 to 2026. The record is -38.9 C (-38.0 F) in 2024, marked on the chart; the median year is -33.0 C (-27.5 F).
Coldest night (TNn) at Lewistown 11 SSE by year
YearColdest night (TNn)
1949-29.4 C (-20.9 F)
1950-35.6 C (-32.1 F)
1951-33.3 C (-27.9 F)
1952-32.8 C (-27.0 F)
1953-22.2 C (-8.0 F)
1954-35.6 C (-32.1 F)
1955-30.6 C (-23.1 F)
1956-35.0 C (-31.0 F)
1957-36.7 C (-34.1 F)
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963n/a
1964n/a
1965n/a
1966n/a
1967n/a
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
1981n/a
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
2008n/a
2009n/a
2010-24.4 C (-11.9 F)
2011-33.3 C (-27.9 F)
2012-28.9 C (-20.0 F)
2013-36.7 C (-34.1 F)
2014-37.2 C (-35.0 F)
2015-27.8 C (-18.0 F)
2016-32.8 C (-27.0 F)
2017-28.3 C (-18.9 F)
2018-32.8 C (-27.0 F)
2019-37.2 C (-35.0 F)
2020-26.1 C (-15.0 F)
2021-37.8 C (-36.0 F)
2022-35.0 C (-31.0 F)
2023-34.4 C (-29.9 F)
2024-38.9 C (-38.0 F)
2025-32.2 C (-26.0 F)
2026-26.1 C (-15.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Lewistown 11 SSE by year The wettest day of the year at Lewistown 11 SSE, 1949 to 2026. The record is 108.0 mm (4.3 in) in 2014, marked on the chart; the median year is 41.2 mm (1.6 in). 02550751001251960198020002020Record: 108.0 mm (4.3 in) in 2014
The wettest day of the year at Lewistown 11 SSE, 1949 to 2026. The record is 108.0 mm (4.3 in) in 2014, marked on the chart; the median year is 41.2 mm (1.6 in).
Wettest day (Rx1day) at Lewistown 11 SSE by year
YearWettest day (Rx1day)
194935.3 mm (1.4 in)
195035.3 mm (1.4 in)
195127.4 mm (1.1 in)
195222.4 mm (0.9 in)
195366.5 mm (2.6 in)
195446.2 mm (1.8 in)
195555.1 mm (2.2 in)
195638.1 mm (1.5 in)
195731.8 mm (1.3 in)
195827.2 mm (1.1 in)
195949.5 mm (1.9 in)
196025.4 mm (1.0 in)
196141.7 mm (1.6 in)
196257.2 mm (2.3 in)
196321.6 mm (0.9 in)
196469.6 mm (2.7 in)
196576.2 mm (3.0 in)
196635.6 mm (1.4 in)
196763.0 mm (2.5 in)
196833.5 mm (1.3 in)
196971.6 mm (2.8 in)
197034.8 mm (1.4 in)
197136.8 mm (1.4 in)
197244.2 mm (1.7 in)
197362.0 mm (2.4 in)
197440.1 mm (1.6 in)
197540.1 mm (1.6 in)
197634.0 mm (1.3 in)
197730.0 mm (1.2 in)
197888.9 mm (3.5 in)
197920.3 mm (0.8 in)
198047.2 mm (1.9 in)
198138.4 mm (1.5 in)
198277.7 mm (3.1 in)
198335.3 mm (1.4 in)
198419.1 mm (0.8 in)
198591.2 mm (3.6 in)
198653.6 mm (2.1 in)
198746.0 mm (1.8 in)
198861.7 mm (2.4 in)
198955.9 mm (2.2 in)
199046.0 mm (1.8 in)
199130.5 mm (1.2 in)
199278.7 mm (3.1 in)
199356.1 mm (2.2 in)
199428.7 mm (1.1 in)
199537.1 mm (1.5 in)
199631.2 mm (1.2 in)
199739.4 mm (1.6 in)
199853.3 mm (2.1 in)
199926.7 mm (1.1 in)
200021.6 mm (0.9 in)
200137.1 mm (1.5 in)
200260.2 mm (2.4 in)
200334.3 mm (1.4 in)
200432.3 mm (1.3 in)
200543.2 mm (1.7 in)
200642.9 mm (1.7 in)
200740.6 mm (1.6 in)
200851.6 mm (2.0 in)
200922.1 mm (0.9 in)
201045.0 mm (1.8 in)
201160.2 mm (2.4 in)
201239.4 mm (1.6 in)
201363.2 mm (2.5 in)
2014108.0 mm (4.3 in)
201546.2 mm (1.8 in)
201645.7 mm (1.8 in)
201736.1 mm (1.4 in)
201830.2 mm (1.2 in)
201956.4 mm (2.2 in)
202036.8 mm (1.4 in)
202124.4 mm (1.0 in)
202243.2 mm (1.7 in)
202390.2 mm (3.6 in)
202476.2 mm (3.0 in)
202541.9 mm (1.6 in)
202636.3 mm (1.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Lewistown 11 SSE by year The wettest five days of the year at Lewistown 11 SSE, 1949 to 2026. The record is 182.1 mm (7.2 in) in 2008, marked on the chart; the median year is 71.4 mm (2.8 in). 0501001502001960198020002020Record: 182.1 mm (7.2 in) in 2008
The wettest five days of the year at Lewistown 11 SSE, 1949 to 2026. The record is 182.1 mm (7.2 in) in 2008, marked on the chart; the median year is 71.4 mm (2.8 in).
Wettest five days (Rx5day) at Lewistown 11 SSE by year
YearWettest five days (Rx5day)
194954.6 mm (2.1 in)
195048.0 mm (1.9 in)
195144.6 mm (1.8 in)
195238.2 mm (1.5 in)
195396.5 mm (3.8 in)
195470.8 mm (2.8 in)
195571.8 mm (2.8 in)
195648.5 mm (1.9 in)
195757.7 mm (2.3 in)
195855.7 mm (2.2 in)
195969.6 mm (2.7 in)
196037.6 mm (1.5 in)
196154.8 mm (2.2 in)
1962119.2 mm (4.7 in)
196365.0 mm (2.6 in)
1964126.5 mm (5.0 in)
1965105.2 mm (4.1 in)
196654.2 mm (2.1 in)
1967138.7 mm (5.5 in)
196874.7 mm (2.9 in)
1969126.3 mm (5.0 in)
197068.6 mm (2.7 in)
197160.7 mm (2.4 in)
197256.7 mm (2.2 in)
197373.2 mm (2.9 in)
197478.7 mm (3.1 in)
197593.2 mm (3.7 in)
197672.2 mm (2.8 in)
197772.9 mm (2.9 in)
1978143.1 mm (5.6 in)
197928.7 mm (1.1 in)
198073.6 mm (2.9 in)
198169.2 mm (2.7 in)
1982129.0 mm (5.1 in)
198347.8 mm (1.9 in)
198438.9 mm (1.5 in)
198599.0 mm (3.9 in)
198690.2 mm (3.6 in)
198757.6 mm (2.3 in)
1988112.5 mm (4.4 in)
198998.5 mm (3.9 in)
199082.8 mm (3.3 in)
199165.6 mm (2.6 in)
1992144.0 mm (5.7 in)
199381.5 mm (3.2 in)
199454.5 mm (2.1 in)
199571.4 mm (2.8 in)
199670.1 mm (2.8 in)
199771.4 mm (2.8 in)
199893.8 mm (3.7 in)
199935.7 mm (1.4 in)
200050.1 mm (2.0 in)
200199.6 mm (3.9 in)
200268.3 mm (2.7 in)
200355.9 mm (2.2 in)
200472.8 mm (2.9 in)
200583.5 mm (3.3 in)
200659.8 mm (2.4 in)
200784.2 mm (3.3 in)
2008182.1 mm (7.2 in)
200938.9 mm (1.5 in)
201079.9 mm (3.1 in)
2011150.0 mm (5.9 in)
201224.1 mm (0.9 in)
2013164.6 mm (6.5 in)
2014179.1 mm (7.1 in)
201594.7 mm (3.7 in)
201685.4 mm (3.4 in)
201765.3 mm (2.6 in)
201863.0 mm (2.5 in)
201963.8 mm (2.5 in)
202049.5 mm (1.9 in)
202143.1 mm (1.7 in)
202278.0 mm (3.1 in)
2023137.0 mm (5.4 in)
2024127.5 mm (5.0 in)
202561.7 mm (2.4 in)
202669.4 mm (2.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Lewistown 11 SSE by year The longest dry spell of the year at Lewistown 11 SSE, 1949 to 2026. The record is 50 days in 1951, marked on the chart; the median year is 23 days. 02040601960198020002020Record: 50 days in 1951
The longest dry spell of the year at Lewistown 11 SSE, 1949 to 2026. The record is 50 days in 1951, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Lewistown 11 SSE by year
YearLongest dry spell (CDD)
194919 days
195018 days
195150 days
195223 days
195326 days
195433 days
195520 days
195642 days
195733 days
195836 days
195923 days
196017 days
196119 days
196224 days
196321 days
196429 days
196520 days
196629 days
196719 days
196821 days
196925 days
197026 days
197122 days
197220 days
197322 days
197425 days
197531 days
197623 days
197720 days
197814 days
197925 days
198022 days
198124 days
198222 days
198325 days
198425 days
198527 days
198621 days
198732 days
198827 days
198912 days
199036 days
199118 days
199222 days
199315 days
199439 days
199518 days
199624 days
199720 days
199827 days
199915 days
200017 days
200136 days
200228 days
200321 days
200418 days
200523 days
200623 days
200723 days
200820 days
200918 days
201026 days
20112 days
201232 days
201315 days
201417 days
201520 days
201617 days
201725 days
201820 days
201920 days
202033 days
202123 days
202221 days
202320 days
202427 days
202518 days
202625 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

69 years, 1950 to 2025

A day with at least 42.1 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 114.8 mm (4.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Lewistown 11 SSE: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years42.1 mm (1.7 in)
5 years59.4 mm (2.3 in)
10 years71.7 mm (2.8 in)
25 years88.2 mm (3.5 in)
50 years101.2 mm (4.0 in)
100 years114.8 mm (4.5 in)Longer than the 69 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, 69 years of values from 1950 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: 108.0 mm (4.3 in) in 2014; 91.2 mm (3.6 in) in 1985; 90.2 mm (3.6 in) in 2023.

Download the Data

  • Data for Lewistown 11 SSE standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Lewistown 11 SSE 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

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