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Tripoli Weather Records (USC00138339)

Record envelope, standing records and threshold days for Tripoli (USC00138339), Iowa, United States, with 76 years of record.

Key Facts for Tripoli

  • Tripoli (USC00138339) is a weather station in Iowa, United States at 42.81 latitude and -92.26 longitude, 322 m (1,055 ft) above sea level.
  • The station reports from 1946 to 2021, 76 years of record.
  • 1,464 records set at Tripoli still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Tripoli set a daily record high minimum temperature of 21.7 C (71.1 F) on 11 June 2021.

About the Station

  • Location: Iowa, United States, 42.81 latitude, -92.26 longitude.
  • Elevation: 322 m (1,055 ft).
  • Period of record: 1946 to 2021, 76 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Tripoli, with 2026 drawn through them The band shows the record high and record low for each calendar day at Tripoli. The lines show the 2026 daily maximum and minimum. 0 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 Tripoli. 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 Tripoli, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan16.7 C (62.1 F)-35.6 C (-32.1 F)n/an/a
Feb20.0 C (68.0 F)-35.6 C (-32.1 F)n/an/a
Mar28.9 C (84.0 F)-32.8 C (-27.0 F)n/an/a
Apr35.6 C (96.1 F)-17.8 C (0.0 F)n/an/a
May35.6 C (96.1 F)-4.4 C (24.1 F)n/an/a
Jun38.9 C (102.0 F)2.2 C (36.0 F)n/an/a
Jul38.3 C (100.9 F)6.1 C (43.0 F)n/an/a
Aug40.0 C (104.0 F)3.3 C (37.9 F)n/an/a
Sep36.7 C (98.1 F)-3.9 C (25.0 F)n/an/a
Oct33.9 C (93.0 F)-12.2 C (10.0 F)n/an/a
Nov26.1 C (79.0 F)-26.1 C (-15.0 F)n/an/a
Dec18.3 C (64.9 F)-33.3 C (-27.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Tripoli by the year they were set 1,464 records at Tripoli still stand. 2012 holds the most, with 39. 0102030401946: 81947: 371948: 81949: 251950: 251951: 241952: 281953: 281954: 201955: 281956: 151957: 81958: 151959: 181960: 151961: 81962: 231963: 261964: 281965: 271966: 181967: 191968: 221969: 111970: 201971: 141972: 171973: 231974: 221975: 171976: 221977: 261978: 131979: 161980: 141981: 211982: 101984: 101985: 271986: 231987: 121988: 291989: 271990: 231991: 281992: 201993: 161994: 181995: 151996: 201997: 181998: 241999: 142000: 342001: 142002: 142003: 162004: 182005: 162006: 262007: 142008: 72009: 122010: 72011: 222012: 392013: 142014: 302015: 152016: 92017: 272018: 262019: 212020: 212021: 191946195419621970197819871995200320112019
1,464 records at Tripoli still stand. 2012 holds the most, with 39.
Standing records at Tripoli by the year they were set
Year setStanding records
19468
194737
19488
194925
195025
195124
195228
195328
195420
195528
195615
19578
195815
195918
196015
19618
196223
196326
196428
196527
196618
196719
196822
196911
197020
197114
197217
197323
197422
197517
197622
197726
197813
197916
198014
198121
198210
198410
198527
198623
198712
198829
198927
199023
199128
199220
199316
199418
199515
199620
199718
199824
199914
200034
200114
200214
200316
200418
200516
200626
200714
20087
200912
20107
201122
201239
201314
201430
201515
20169
201727
201826
201921
202021
202119

All-Time Record Progression

6 new records
When Tripoli set new all-time records 6 all-time records were set at Tripoli between 26 June 1978 and 1 January 2001. Each dot is a new record. Record high minimum temperatureRecord high maximum temperatureRecord low maximum temperatureRecord daily precipitationRecord snow depth26 June 1978: Record high minimum temperature 26.1 C (79.0 F)26 June 1980: Record high maximum temperature 38.9 C (102.0 F)20 January 1985: Record low maximum temperature -26.7 C (-16.1 F)18 August 1988: Record high maximum temperature 40.0 C (104.0 F)17 May 1999: Record daily precipitation 140.5 mm (5.5 in)1 January 2001: Record snow depth 88.9 cm (35.0 in)19801985199019952000
6 all-time records were set at Tripoli between 26 June 1978 and 1 January 2001. Each dot is a new record.
When Tripoli set new all-time records
DateKindDetail
1978-06-26Record high minimum temperatureRecord high minimum temperature 26.1 C (79.0 F)
1980-06-26Record high maximum temperatureRecord high maximum temperature 38.9 C (102.0 F)
1985-01-20Record low maximum temperatureRecord low maximum temperature -26.7 C (-16.1 F)
1988-08-18Record high maximum temperatureRecord high maximum temperature 40.0 C (104.0 F)
1999-05-17Record daily precipitationRecord daily precipitation 140.5 mm (5.5 in)
2001-01-01Record snow depthRecord snow depth 88.9 cm (35.0 in)

Wettest Day of Each Month

May: 140.5 mm (5.5 in)
Record daily precipitation for each month at Tripoli The wettest day on record for each calendar month at Tripoli. The most was 140.5 mm (5.5 in) on 17 May 1999. 050100150 Jan: 41.4 mm (1.6 in), 22 January 2018 Jan Feb: 39.4 mm (1.6 in), 18 February 1961 Feb Mar: 46.5 mm (1.8 in), 26 March 2004 Mar Apr: 139.7 mm (5.5 in), 29 April 1951 Apr May: 140.5 mm (5.5 in), 17 May 1999 May Jun: 110.5 mm (4.4 in), 26 June 1951 Jun Jul: 130.8 mm (5.1 in), 17 July 1968 Jul Aug: 139.7 mm (5.5 in), 31 August 1981 Aug Sep: 124.5 mm (4.9 in), 11 September 2006 Sep Oct: 86.4 mm (3.4 in), 9 October 1970 Oct Nov: 78.7 mm (3.1 in), 1 November 1991 Nov Dec: 75.7 mm (3.0 in), 13 December 2015 Dec
The wettest day on record for each calendar month at Tripoli. The most was 140.5 mm (5.5 in) on 17 May 1999.
Record daily precipitation for each month at Tripoli
MonthRecord daily precipitation (mm)Date
Jan41.4 mm (1.6 in)22 January 2018
Feb39.4 mm (1.6 in)18 February 1961
Mar46.5 mm (1.8 in)26 March 2004
Apr139.7 mm (5.5 in)29 April 1951
May140.5 mm (5.5 in)17 May 1999
Jun110.5 mm (4.4 in)26 June 1951
Jul130.8 mm (5.1 in)17 July 1968
Aug139.7 mm (5.5 in)31 August 1981
Sep124.5 mm (4.9 in)11 September 2006
Oct86.4 mm (3.4 in)9 October 1970
Nov78.7 mm (3.1 in)1 November 1991
Dec75.7 mm (3.0 in)13 December 2015

Period of Record Coverage

1946 to 2021
Days with data per year at Tripoli 75 years of record at Tripoli, 1946 to 2021. 7 years have data for under 90 percent of days and are left out of rankings: 1946, 1948, 1982, 1984, 2002, 2003, 2021. 1946: 120 of 365 days1947: 333 of 365 days1948: 213 of 366 days1949: 365 of 365 days1950: 365 of 365 days1951: 356 of 365 days1952: 365 of 366 days1953: 365 of 365 days1954: 364 of 365 days1955: 333 of 365 days1956: 366 of 366 days1957: 365 of 365 days1958: 364 of 365 days1959: 363 of 365 days1960: 366 of 366 days1961: 365 of 365 days1962: 365 of 365 days1963: 363 of 365 days1964: 361 of 366 days1965: 364 of 365 days1966: 365 of 365 days1967: 364 of 365 days1968: 365 of 366 days1969: 363 of 365 days1970: 361 of 365 days1971: 331 of 365 days1972: 364 of 366 days1973: 363 of 365 days1974: 363 of 365 days1975: 363 of 365 days1976: 365 of 366 days1977: 362 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 360 of 366 days1981: 352 of 365 days1982: 117 of 365 days1984: 122 of 366 days1985: 363 of 365 days1986: 365 of 365 days1987: 356 of 365 days1988: 364 of 366 days1989: 332 of 365 days1990: 365 of 365 days1991: 363 of 365 days1992: 364 of 366 days1993: 362 of 365 days1994: 354 of 365 days1995: 361 of 365 days1996: 353 of 366 days1997: 358 of 365 days1998: 364 of 365 days1999: 365 of 365 days2000: 365 of 366 days2001: 365 of 365 days2002: 264 of 365 days2003: 276 of 365 days2004: 365 of 366 days2005: 365 of 365 days2006: 340 of 365 days2007: 362 of 365 days2008: 333 of 366 days2009: 352 of 365 days2010: 337 of 365 days2011: 363 of 365 days2012: 362 of 366 days2013: 365 of 365 days2014: 360 of 365 days2015: 341 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 363 of 365 days2020: 363 of 366 days2021: 193 of 365 days19501960197019801990200020102020
75 years of record at Tripoli, 1946 to 2021. 7 years have data for under 90 percent of days and are left out of rankings: 1946, 1948, 1982, 1984, 2002, 2003, 2021.
Days with data per year at Tripoli
YearDays with dataShare of yearComplete
194612033%No
194733391%Yes
194821358%No
1949365100%Yes
1950365100%Yes
195135698%Yes
1952365100%Yes
1953365100%Yes
1954364100%Yes
195533391%Yes
1956366100%Yes
1957365100%Yes
1958364100%Yes
195936399%Yes
1960366100%Yes
1961365100%Yes
1962365100%Yes
196336399%Yes
196436199%Yes
1965364100%Yes
1966365100%Yes
1967364100%Yes
1968365100%Yes
196936399%Yes
197036199%Yes
197133191%Yes
197236499%Yes
197336399%Yes
197436399%Yes
197536399%Yes
1976365100%Yes
197736299%Yes
1978365100%Yes
1979365100%Yes
198036098%Yes
198135296%Yes
198211732%No
198412233%No
198536399%Yes
1986365100%Yes
198735698%Yes
198836499%Yes
198933291%Yes
1990365100%Yes
199136399%Yes
199236499%Yes
199336299%Yes
199435497%Yes
199536199%Yes
199635396%Yes
199735898%Yes
1998364100%Yes
1999365100%Yes
2000365100%Yes
2001365100%Yes
200226472%No
200327676%No
2004365100%Yes
2005365100%Yes
200634093%Yes
200736299%Yes
200833391%Yes
200935296%Yes
201033792%Yes
201136399%Yes
201236299%Yes
2013365100%Yes
201436099%Yes
201534193%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
201936399%Yes
202036399%Yes
202119353%No

Latest Records

20
Latest records at Tripoli
DateStationRecordValueBeat old record byOld record stoodSignificance
11 June 2021Tripoli, USdaily high min21.7 C (71.1 F)0.6 C (1.1 F)48 years22 of 100 (Routine)
11 June 2021Tripoli, USdaily high max (Tie)35.0 C (95.0 F)tie4 years2 of 100 (Routine)
10 June 2021Tripoli, USdaily high min21.7 C (71.1 F)1.1 C (2.0 F)20 years15 of 100 (Routine)
7 June 2021Tripoli, USdaily high min (Tie)19.4 C (66.9 F)tie68 years6 of 100 (Routine)
6 June 2021Tripoli, USdaily high min (Tie)19.4 C (66.9 F)tie58 years6 of 100 (Routine)
5 June 2021Tripoli, USdaily high max (Tie)33.3 C (91.9 F)tie44 years5 of 100 (Routine)
25 May 2021Tripoli, USdaily high min (Tie)19.4 C (66.9 F)tie43 years4 of 100 (Routine)
2 May 2021Tripoli, USdaily high max33.9 C (93.0 F)2.8 C (5.0 F)62 years29 of 100 (Routine)
22 April 2021Tripoli, USdaily low min-5.6 C (21.9 F)1.2 C (2.2 F)35 years19 of 100 (Routine)
21 April 2021Tripoli, USdaily low min-6.7 C (19.9 F)1.7 C (3.1 F)71 years31 of 100 (Routine)
21 April 2021Tripoli, USdaily low max (Tie)6.7 C (44.1 F)tie26 years3 of 100 (Routine)
9 April 2021Tripoli, USdaily high min8.9 C (48.0 F)0.6 C (1.1 F)32 years17 of 100 (Routine)
8 April 2021Tripoli, USdaily high min13.9 C (57.0 F)1.1 C (2.0 F)30 years18 of 100 (Routine)
8 April 2021Tripoli, USdaily high max (Tie)25.0 C (77.0 F)tie30 years4 of 100 (Routine)
7 April 2021Tripoli, USdaily high min13.9 C (57.0 F)1.1 C (2.0 F)30 years18 of 100 (Routine)
6 April 2021Tripoli, USdaily high min14.4 C (57.9 F)3.3 C (5.9 F)16 years17 of 100 (Routine)
5 April 2021Tripoli, USdaily high max27.2 C (81.0 F)0.5 C (0.9 F)16 years11 of 100 (Routine)
1 April 2021Tripoli, USdaily low min (Tie)-9.4 C (15.1 F)tie34 years4 of 100 (Routine)
16 March 2021Tripoli, USdaily snowfall10.2 cm (4.0 in)5.1 cm (2.0 in)60 years34 of 100 (Routine)
11 March 2021Tripoli, USdaily high max21.1 C (70.0 F)2.8 C (5.0 F)8 years12 of 100 (Routine)

Climate Trend

60 complete years, 1949 to 2020
Annual mean temperature at Tripoli as warming stripes, 1949 to 2020 One stripe for each of 60 complete years at Tripoli, 1949 to 2020. Blue stripes are years cooler than the station's own mean of 8.0 C (46.5 F); red stripes are warmer. The coolest year was 2014, at 5.6 C (42.1 F), and the warmest was 2012, at 10.0 C (50.0 F). The strongest colour marks a difference of 2.5 C (4.5 F). 1949: 9.3 C, +1.3 C from the station mean1950: 7.3 C, -0.7 C from the station mean1951: 6.9 C, -1.1 C from the station mean1952: 9.2 C, +1.1 C from the station mean1953: 9.5 C, +1.5 C from the station mean1954: 9.6 C, +1.5 C from the station mean1956: 8.3 C, +0.2 C from the station mean1957: 8.0 C, -0.1 C from the station mean1958: 7.6 C, -0.4 C from the station mean1959: 7.5 C, -0.5 C from the station mean1960: 8.1 C, +0.1 C from the station mean1961: 8.1 C, +0.1 C from the station mean1962: 7.7 C, -0.3 C from the station mean1963: 8.2 C, +0.2 C from the station mean1964: 9.2 C, +1.1 C from the station mean1965: 7.9 C, -0.2 C from the station mean1966: 7.8 C, -0.2 C from the station mean1967: 7.7 C, -0.3 C from the station mean1968: 8.4 C, +0.4 C from the station mean1969: 7.6 C, -0.4 C from the station mean1970: 7.8 C, -0.3 C from the station mean1972: 7.0 C, -1.0 C from the station mean1973: 9.1 C, +1.0 C from the station mean1974: 8.1 C, +0.1 C from the station mean1975: 8.3 C, +0.2 C from the station mean1976: 8.2 C, +0.1 C from the station mean1977: 8.6 C, +0.6 C from the station mean1978: 7.1 C, -0.9 C from the station mean1979: 7.1 C, -0.9 C from the station mean1980: 8.6 C, +0.6 C from the station mean1981: 9.2 C, +1.1 C from the station mean1985: 6.4 C, -1.7 C from the station mean1986: 7.3 C, -0.7 C from the station mean1987: 9.3 C, +1.2 C from the station mean1988: 7.6 C, -0.4 C from the station mean1990: 8.4 C, +0.4 C from the station mean1991: 7.7 C, -0.4 C from the station mean1992: 7.3 C, -0.8 C from the station mean1993: 6.3 C, -1.8 C from the station mean1994: 7.2 C, -0.8 C from the station mean1995: 7.3 C, -0.8 C from the station mean1996: 6.6 C, -1.4 C from the station mean1997: 7.6 C, -0.4 C from the station mean1998: 9.7 C, +1.6 C from the station mean1999: 8.9 C, +0.9 C from the station mean2000: 8.3 C, +0.3 C from the station mean2001: 8.5 C, +0.5 C from the station mean2004: 8.3 C, +0.3 C from the station mean2005: 8.6 C, +0.5 C from the station mean2007: 8.2 C, +0.1 C from the station mean2009: 7.0 C, -1.0 C from the station mean2011: 8.0 C, 0.0 C from the station mean2012: 10.0 C, +2.0 C from the station mean2013: 6.8 C, -1.2 C from the station mean2014: 5.6 C, -2.4 C from the station mean2016: 9.4 C, +1.4 C from the station mean2017: 9.0 C, +1.0 C from the station mean2018: 7.7 C, -0.3 C from the station mean2019: 7.3 C, -0.7 C from the station mean2020: 8.5 C, +0.5 C from the station mean19491960197019801990200020102020
One stripe for each of 60 complete years at Tripoli, 1949 to 2020. Blue stripes are years cooler than the station's own mean of 8.0 C (46.5 F); red stripes are warmer. The coolest year was 2014, at 5.6 C (42.1 F), and the warmest was 2012, at 10.0 C (50.0 F). The strongest colour marks a difference of 2.5 C (4.5 F).
Annual mean temperature at Tripoli as warming stripes, 1949 to 2020
YearAnnual mean temperatureDifference from the station mean
19499.3 C+1.27 C
19507.3 C-0.71 C
19516.9 C-1.13 C
19529.2 C+1.13 C
19539.5 C+1.50 C
19549.6 C+1.55 C
19568.3 C+0.24 C
19578.0 C-0.05 C
19587.6 C-0.41 C
19597.5 C-0.53 C
19608.1 C+0.09 C
19618.1 C+0.11 C
19627.7 C-0.32 C
19638.2 C+0.19 C
19649.2 C+1.14 C
19657.9 C-0.17 C
19667.8 C-0.21 C
19677.7 C-0.30 C
19688.4 C+0.41 C
19697.6 C-0.41 C
19707.8 C-0.25 C
19727.0 C-1.00 C
19739.1 C+1.05 C
19748.1 C+0.11 C
19758.3 C+0.25 C
19768.2 C+0.12 C
19778.6 C+0.57 C
19787.1 C-0.90 C
19797.1 C-0.89 C
19808.6 C+0.56 C
19819.2 C+1.13 C
19856.4 C-1.65 C
19867.3 C-0.73 C
19879.3 C+1.24 C
19887.6 C-0.42 C
19908.4 C+0.37 C
19917.7 C-0.37 C
19927.3 C-0.78 C
19936.3 C-1.76 C
19947.2 C-0.82 C
19957.3 C-0.78 C
19966.6 C-1.41 C
19977.6 C-0.40 C
19989.7 C+1.65 C
19998.9 C+0.89 C
20008.3 C+0.28 C
20018.5 C+0.46 C
20048.3 C+0.30 C
20058.6 C+0.54 C
20078.2 C+0.15 C
20097.0 C-1.00 C
20118.0 C-0.03 C
201210.0 C+1.98 C
20136.8 C-1.21 C
20145.6 C-2.42 C
20169.4 C+1.37 C
20179.0 C+1.01 C
20187.7 C-0.31 C
20197.3 C-0.72 C
20208.5 C+0.50 C

The fitted trend in annual mean temperature here over 1949 to 2020 is -0.04 C (-0.16 to 0.07) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.3 to 0.1) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Tripoli
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.04 C (-0.16 to 0.07) per decade-0.1 F (-0.3 to 0.1) per decade1949 to 202060Not clearly different from zero
Mean daily maximum-0.09 C (-0.22 to 0.04) per decade-0.2 F (-0.4 to 0.1) per decade1949 to 202060Not clearly different from zero
Mean daily minimum0.0 C (-0.1 to 0.1) per decade0.0 F (-0.2 to 0.2) per decade1949 to 202060Not 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

1946 to 2021
Yearly extremes at Tripoli: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)40.0 C (104.0 F)198835.0 C (95.0 F)75
Coldest night (TNn)-35.6 C (-32.1 F)1970-29.4 C (-20.9 F)75
Wettest day (Rx1day)140.5 mm (5.5 in)199963.5 mm (2.5 in)75
Wettest five days (Rx5day)201.9 mm (7.9 in)1981104.3 mm (4.1 in)75
Longest dry spell (CDD)59 days195223 days75

Hottest day (TXx)

Hottest day (TXx) at Tripoli by year The hottest day of the year at Tripoli, 1946 to 2021. The record is 40.0 C (104.0 F) in 1988, marked on the chart; the median year is 35.0 C (95.0 F). 253035401960198020002020Record: 40.0 C (104.0 F) in 1988
The hottest day of the year at Tripoli, 1946 to 2021. The record is 40.0 C (104.0 F) in 1988, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Tripoli by year
YearHottest day (TXx)
194628.9 C (84.0 F)
194737.8 C (100.0 F)
194838.3 C (100.9 F)
194936.1 C (97.0 F)
195032.8 C (91.0 F)
195133.3 C (91.9 F)
195235.6 C (96.1 F)
195336.1 C (97.0 F)
195435.6 C (96.1 F)
195538.3 C (100.9 F)
195635.0 C (95.0 F)
195735.6 C (96.1 F)
195833.3 C (91.9 F)
195933.3 C (91.9 F)
196035.6 C (96.1 F)
196133.9 C (93.0 F)
196232.2 C (90.0 F)
196336.1 C (97.0 F)
196435.0 C (95.0 F)
196536.1 C (97.0 F)
196636.1 C (97.0 F)
196733.9 C (93.0 F)
196834.4 C (93.9 F)
196933.3 C (91.9 F)
197037.8 C (100.0 F)
197133.9 C (93.0 F)
197234.4 C (93.9 F)
197333.9 C (93.0 F)
197435.0 C (95.0 F)
197534.4 C (93.9 F)
197636.1 C (97.0 F)
197736.1 C (97.0 F)
197835.0 C (95.0 F)
197933.3 C (91.9 F)
198038.9 C (102.0 F)
198137.8 C (100.0 F)
198231.1 C (88.0 F)
198436.1 C (97.0 F)
198537.8 C (100.0 F)
198634.4 C (93.9 F)
198736.7 C (98.1 F)
198840.0 C (104.0 F)
198936.7 C (98.1 F)
199036.7 C (98.1 F)
199135.6 C (96.1 F)
199232.2 C (90.0 F)
199332.2 C (90.0 F)
199433.3 C (91.9 F)
199537.2 C (99.0 F)
199635.0 C (95.0 F)
199733.9 C (93.0 F)
199834.4 C (93.9 F)
199935.6 C (96.1 F)
200035.0 C (95.0 F)
200135.0 C (95.0 F)
200234.4 C (93.9 F)
200336.7 C (98.1 F)
200432.2 C (90.0 F)
200534.4 C (93.9 F)
200635.6 C (96.1 F)
200734.4 C (93.9 F)
200832.8 C (91.0 F)
200934.4 C (93.9 F)
201033.9 C (93.0 F)
201136.1 C (97.0 F)
201238.3 C (100.9 F)
201335.6 C (96.1 F)
201432.8 C (91.0 F)
201535.6 C (96.1 F)
201635.0 C (95.0 F)
201735.0 C (95.0 F)
201835.6 C (96.1 F)
201934.4 C (93.9 F)
202035.6 C (96.1 F)
202135.0 C (95.0 F)

Coldest night (TNn)

Coldest night (TNn) at Tripoli by year The coldest night of the year at Tripoli, 1946 to 2021. The record is -35.6 C (-32.1 F) in 1970, marked on the chart; the median year is -29.4 C (-20.9 F). -40-35-30-25-201960198020002020Record: -35.6 C (-32.1 F) in 1970
The coldest night of the year at Tripoli, 1946 to 2021. The record is -35.6 C (-32.1 F) in 1970, marked on the chart; the median year is -29.4 C (-20.9 F).
Coldest night (TNn) at Tripoli by year
YearColdest night (TNn)
1946-27.8 C (-18.0 F)
1947-28.3 C (-18.9 F)
1948-26.7 C (-16.1 F)
1949-29.4 C (-20.9 F)
1950-32.8 C (-27.0 F)
1951-34.4 C (-29.9 F)
1952-26.7 C (-16.1 F)
1953-27.2 C (-17.0 F)
1954-28.3 C (-18.9 F)
1955-27.8 C (-18.0 F)
1956-30.0 C (-22.0 F)
1957-28.9 C (-20.0 F)
1958-31.7 C (-25.1 F)
1959-29.4 C (-20.9 F)
1960-28.3 C (-18.9 F)
1961-31.1 C (-24.0 F)
1962-32.8 C (-27.0 F)
1963-32.8 C (-27.0 F)
1964-24.4 C (-11.9 F)
1965-30.0 C (-22.0 F)
1966-34.4 C (-29.9 F)
1967-32.8 C (-27.0 F)
1968-28.9 C (-20.0 F)
1969-28.9 C (-20.0 F)
1970-35.6 C (-32.1 F)
1971-31.7 C (-25.1 F)
1972-33.3 C (-27.9 F)
1973-30.0 C (-22.0 F)
1974-31.7 C (-25.1 F)
1975-27.8 C (-18.0 F)
1976-30.0 C (-22.0 F)
1977-33.3 C (-27.9 F)
1978-28.9 C (-20.0 F)
1979-33.3 C (-27.9 F)
1980-24.4 C (-11.9 F)
1981-28.9 C (-20.0 F)
1982-34.4 C (-29.9 F)
1984-21.1 C (-6.0 F)
1985-31.7 C (-25.1 F)
1986-31.1 C (-24.0 F)
1987-25.6 C (-14.1 F)
1988-31.7 C (-25.1 F)
1989-30.6 C (-23.1 F)
1990-29.4 C (-20.9 F)
1991-29.4 C (-20.9 F)
1992-23.9 C (-11.0 F)
1993-27.2 C (-17.0 F)
1994-32.2 C (-26.0 F)
1995-23.9 C (-11.0 F)
1996-35.6 C (-32.1 F)
1997-26.7 C (-16.1 F)
1998-24.4 C (-11.9 F)
1999-31.1 C (-24.0 F)
2000-33.3 C (-27.9 F)
2001-25.0 C (-13.0 F)
2002-22.2 C (-8.0 F)
2003-24.4 C (-11.9 F)
2004-27.8 C (-18.0 F)
2005-28.3 C (-18.9 F)
2006-28.9 C (-20.0 F)
2007-28.3 C (-18.9 F)
2008-30.6 C (-23.1 F)
2009-35.6 C (-32.1 F)
2010-27.8 C (-18.0 F)
2011-29.4 C (-20.9 F)
2012-22.8 C (-9.0 F)
2013-27.2 C (-17.0 F)
2014-30.0 C (-22.0 F)
2015-29.4 C (-20.9 F)
2016-29.4 C (-20.9 F)
2017-26.7 C (-16.1 F)
2018-28.9 C (-20.0 F)
2019-33.9 C (-29.0 F)
2020-27.8 C (-18.0 F)
2021-30.0 C (-22.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Tripoli by year The wettest day of the year at Tripoli, 1946 to 2021. The record is 140.5 mm (5.5 in) in 1999, marked on the chart; the median year is 63.5 mm (2.5 in). 0501001501960198020002020Record: 140.5 mm (5.5 in) in 1999
The wettest day of the year at Tripoli, 1946 to 2021. The record is 140.5 mm (5.5 in) in 1999, marked on the chart; the median year is 63.5 mm (2.5 in).
Wettest day (Rx1day) at Tripoli by year
YearWettest day (Rx1day)
194640.6 mm (1.6 in)
1947100.6 mm (4.0 in)
194863.5 mm (2.5 in)
194940.6 mm (1.6 in)
195050.8 mm (2.0 in)
1951139.7 mm (5.5 in)
195251.8 mm (2.0 in)
195344.5 mm (1.8 in)
195484.3 mm (3.3 in)
195561.0 mm (2.4 in)
195641.1 mm (1.6 in)
195733.0 mm (1.3 in)
195873.9 mm (2.9 in)
195969.9 mm (2.8 in)
196076.2 mm (3.0 in)
196152.1 mm (2.1 in)
196279.5 mm (3.1 in)
1963118.4 mm (4.7 in)
196467.3 mm (2.6 in)
196550.8 mm (2.0 in)
196654.6 mm (2.1 in)
196753.3 mm (2.1 in)
1968130.8 mm (5.1 in)
196966.0 mm (2.6 in)
197086.4 mm (3.4 in)
197154.9 mm (2.2 in)
197269.9 mm (2.8 in)
197341.9 mm (1.6 in)
197455.9 mm (2.2 in)
197534.3 mm (1.4 in)
197657.2 mm (2.3 in)
197767.3 mm (2.6 in)
197853.3 mm (2.1 in)
1979101.6 mm (4.0 in)
198082.6 mm (3.3 in)
1981139.7 mm (5.5 in)
198247.0 mm (1.9 in)
198443.7 mm (1.7 in)
198579.8 mm (3.1 in)
198647.8 mm (1.9 in)
198787.6 mm (3.4 in)
198847.5 mm (1.9 in)
198950.0 mm (2.0 in)
199079.8 mm (3.1 in)
199188.9 mm (3.5 in)
199246.0 mm (1.8 in)
199351.1 mm (2.0 in)
199455.1 mm (2.2 in)
199596.8 mm (3.8 in)
199653.1 mm (2.1 in)
199774.9 mm (2.9 in)
199851.6 mm (2.0 in)
1999140.5 mm (5.5 in)
200068.6 mm (2.7 in)
200178.7 mm (3.1 in)
200244.7 mm (1.8 in)
200353.3 mm (2.1 in)
200492.7 mm (3.6 in)
2005106.7 mm (4.2 in)
2006124.5 mm (4.9 in)
200783.6 mm (3.3 in)
2008130.3 mm (5.1 in)
200961.2 mm (2.4 in)
201089.9 mm (3.5 in)
201151.8 mm (2.0 in)
201241.4 mm (1.6 in)
201357.4 mm (2.3 in)
201458.7 mm (2.3 in)
201575.7 mm (3.0 in)
2016117.1 mm (4.6 in)
2017120.9 mm (4.8 in)
201899.6 mm (3.9 in)
201955.4 mm (2.2 in)
202078.7 mm (3.1 in)
202139.6 mm (1.6 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Tripoli by year The wettest five days of the year at Tripoli, 1946 to 2021. The record is 201.9 mm (7.9 in) in 1981, marked on the chart; the median year is 104.3 mm (4.1 in). 501001502002501960198020002020Record: 201.9 mm (7.9 in) in 1981
The wettest five days of the year at Tripoli, 1946 to 2021. The record is 201.9 mm (7.9 in) in 1981, marked on the chart; the median year is 104.3 mm (4.1 in).
Wettest five days (Rx5day) at Tripoli by year
YearWettest five days (Rx5day)
194684.3 mm (3.3 in)
1947140.0 mm (5.5 in)
1948134.7 mm (5.3 in)
194968.8 mm (2.7 in)
195063.3 mm (2.5 in)
1951178.0 mm (7.0 in)
195263.2 mm (2.5 in)
195386.6 mm (3.4 in)
1954142.2 mm (5.6 in)
1955124.5 mm (4.9 in)
195695.4 mm (3.8 in)
195762.5 mm (2.5 in)
195883.8 mm (3.3 in)
195996.8 mm (3.8 in)
1960102.4 mm (4.0 in)
196181.8 mm (3.2 in)
1962106.7 mm (4.2 in)
1963133.4 mm (5.3 in)
196488.1 mm (3.5 in)
196574.7 mm (2.9 in)
196663.8 mm (2.5 in)
196796.7 mm (3.8 in)
1968146.1 mm (5.8 in)
1969136.1 mm (5.4 in)
1970121.0 mm (4.8 in)
197199.6 mm (3.9 in)
1972110.1 mm (4.3 in)
197368.0 mm (2.7 in)
197475.4 mm (3.0 in)
197555.6 mm (2.2 in)
1976107.8 mm (4.2 in)
197782.3 mm (3.2 in)
1978112.0 mm (4.4 in)
1979175.5 mm (6.9 in)
1980146.2 mm (5.8 in)
1981201.9 mm (7.9 in)
1982104.3 mm (4.1 in)
198453.1 mm (2.1 in)
198579.8 mm (3.1 in)
198669.6 mm (2.7 in)
1987106.4 mm (4.2 in)
198853.6 mm (2.1 in)
198961.7 mm (2.4 in)
1990109.3 mm (4.3 in)
199188.9 mm (3.5 in)
199266.1 mm (2.6 in)
199393.5 mm (3.7 in)
1994107.7 mm (4.2 in)
1995108.4 mm (4.3 in)
199665.0 mm (2.6 in)
1997108.4 mm (4.3 in)
199896.3 mm (3.8 in)
1999164.9 mm (6.5 in)
200096.5 mm (3.8 in)
200195.2 mm (3.7 in)
200257.7 mm (2.3 in)
200381.0 mm (3.2 in)
2004149.1 mm (5.9 in)
2005115.6 mm (4.6 in)
2006136.9 mm (5.4 in)
2007178.4 mm (7.0 in)
2008159.8 mm (6.3 in)
2009109.5 mm (4.3 in)
2010124.2 mm (4.9 in)
201183.9 mm (3.3 in)
201268.1 mm (2.7 in)
2013111.0 mm (4.4 in)
2014124.7 mm (4.9 in)
2015135.9 mm (5.4 in)
2016179.5 mm (7.1 in)
2017156.7 mm (6.2 in)
2018195.9 mm (7.7 in)
2019107.0 mm (4.2 in)
2020109.0 mm (4.3 in)
202156.6 mm (2.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Tripoli by year The longest dry spell of the year at Tripoli, 1946 to 2021. The record is 59 days in 1952, marked on the chart; the median year is 23 days. 02040601960198020002020Record: 59 days in 1952
The longest dry spell of the year at Tripoli, 1946 to 2021. The record is 59 days in 1952, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Tripoli by year
YearLongest dry spell (CDD)
194626 days
194741 days
194833 days
194927 days
195023 days
195114 days
195259 days
195327 days
195427 days
195517 days
195633 days
195731 days
195837 days
195922 days
196019 days
196114 days
196225 days
196325 days
196419 days
196528 days
196624 days
196724 days
196835 days
196923 days
197017 days
197123 days
197216 days
197320 days
197415 days
197522 days
197624 days
197718 days
197819 days
197917 days
198029 days
198129 days
198214 days
198415 days
198516 days
198622 days
198729 days
198837 days
198923 days
199019 days
199121 days
199220 days
199318 days
199437 days
199535 days
199647 days
199717 days
199820 days
199921 days
200016 days
200118 days
200230 days
200341 days
200419 days
200524 days
200617 days
200730 days
200814 days
200925 days
201021 days
201122 days
201221 days
201318 days
201416 days
201524 days
201627 days
201741 days
201824 days
201926 days
202029 days
202115 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

60 years with a frost

Across 60 years with a frost, the median last spring frost at Tripoli falls on 1 May and the median first autumn frost on 4 October, which leaves a median of 158 days between them.

In 1981 to 2020 the median growing season was 160 days. That is 2 days more than in 1949 to 1980.

Fitted over all years, the growing season changes by +0.6 days per decade at this station.

Frost dates and growing season at Tripoli
MeasureMedian, all yearsEarliest period (1949 to 1980)Recent period (1981 to 2020)Recent against earliestFitted trend
Last spring frost1 May2 May29 April3 days earlier-0.6 days per decade
First autumn frost4 October3 October5 October2 days later0.0 days per decade
Growing days158 days158 days160 days2 days more+0.6 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

68 years, 1947 to 2020

A day with at least 68.1 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 173.8 mm (6.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Tripoli: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years68.1 mm (2.7 in)
5 years93.4 mm (3.7 in)
10 years111.3 mm (4.4 in)
25 years135.3 mm (5.3 in)
50 years154.1 mm (6.1 in)
100 years173.8 mm (6.8 in)Longer than the 68 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, 68 years of values from 1947 to 2020.

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: 140.5 mm (5.5 in) in 1999; 139.7 mm (5.5 in) in 1951; 139.7 mm (5.5 in) in 1981.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Climate Twins

2000 to 2020 against 1961 to 1990

Over 2000 to 2020, Tripoli had a mean temperature of 8.1 C (46.6 F) and 1,014.6 mm (39.9 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Dubuque Rgnl AP (United States, 135 km away), Grinnell 3 SW (United States, 128 km away) and Colo (United States, 124 km away).

Climate twins of Tripoli: stations whose 1961 to 1990 climate is closest to its 2000 to 2020 climate
Twin stationCountryDistance awayMean temperature, 1961-1990Rain a year, 1961-1990Climate difference
Dubuque Rgnl APUnited States135 km (84 mi)8.0 C (46.4 F)972.9 mm (38.3 in)0.54
Grinnell 3 SWUnited States128 km (80 mi)8.2 C (46.8 F)913.5 mm (36.0 in)0.66
ColoUnited States124 km (77 mi)8.3 C (47.0 F)866.4 mm (34.1 in)0.75

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 Tripoli standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Tripoli 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 (2025-12-31).