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Allerton Weather Records (USC00130149)

Record envelope, standing records and threshold days for Allerton (USC00130149), Iowa, United States, with 125 years of record.

Key Facts for Allerton

  • Allerton (USC00130149) is a weather station in Iowa, United States at 40.70 latitude and -93.37 longitude, 332 m (1,090 ft) above sea level.
  • The station reports from 1902 to 2026, 125 years of record.
  • 1,464 records set at Allerton still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Allerton tied a daily record high maximum temperature of 28.9 C (84.0 F) on 11 October 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Iowa, United States, 40.70 latitude, -93.37 longitude.
  • Elevation: 332 m (1,090 ft).
  • Period of record: 1902 to 2026, 125 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

18 days at or beyond a record
Daily record high and record low at Allerton, with 2026 drawn through them The band shows the record high and record low for each calendar day at Allerton. The lines show the 2026 daily maximum and minimum. 18 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 Allerton. The lines show the 2026 daily maximum and minimum. 18 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Allerton, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan19.4 C (66.9 F)-33.9 C (-29.0 F)17.2 C (63.0 F)-23.3 C (-9.9 F)
Feb24.4 C (75.9 F)-36.1 C (-33.0 F)22.2 C (72.0 F)-18.3 C (-0.9 F)
Mar32.8 C (91.0 F)-25.0 C (-13.0 F)32.8 C (91.0 F)-15.6 C (3.9 F)
Apr32.2 C (90.0 F)-13.3 C (8.1 F)30.0 C (86.0 F)-0.6 C (30.9 F)
May35.0 C (95.0 F)-7.2 C (19.0 F)28.9 C (84.0 F)2.2 C (36.0 F)
Jun37.8 C (100.0 F)-1.1 C (30.0 F)32.2 C (90.0 F)11.1 C (52.0 F)
Jul42.2 C (108.0 F)7.8 C (46.0 F)36.1 C (97.0 F)15.6 C (60.1 F)
Aug42.2 C (108.0 F)3.9 C (39.0 F)32.8 C (91.0 F)14.4 C (57.9 F)
Sep39.4 C (102.9 F)-2.8 C (27.0 F)35.6 C (96.1 F)11.1 C (52.0 F)
Oct33.3 C (91.9 F)-8.9 C (16.0 F)29.4 C (84.9 F)7.8 C (46.0 F)
Nov26.7 C (80.1 F)-20.0 C (-4.0 F)n/an/a
Dec22.8 C (73.0 F)-27.8 C (-18.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Allerton by the year they were set 1,464 records at Allerton still stand. 1913 holds the most, with 71. 0204060801902: 251903: 321904: 211905: 311906: 361907: 331908: 331909: 391910: 341911: 671912: 401913: 711914: 321915: 481916: 311917: 331918: 431919: 191979: 21980: 31997: 81998: 351999: 292000: 392001: 202002: 172003: 282004: 332005: 182006: 332007: 182008: 252009: 192010: 82011: 192012: 532013: 292014: 322015: 212016: 202017: 302018: 472019: 272020: 202021: 322022: 302023: 252024: 262025: 252026: 251902190719121917199720022007201220172022
1,464 records at Allerton still stand. 1913 holds the most, with 71.
Standing records at Allerton by the year they were set
Year setStanding records
190225
190332
190421
190531
190636
190733
190833
190939
191034
191167
191240
191371
191432
191548
191631
191733
191843
191919
19792
19803
19978
199835
199929
200039
200120
200217
200328
200433
200518
200633
200718
200825
200919
20108
201119
201253
201329
201432
201521
201620
201730
201847
201927
202020
202132
202230
202325
202426
202525
202625

All-Time Record Progression

1 new records
When Allerton set new all-time records 1 all-time records were set at Allerton between 15 January 2024 and 15 January 2024. Each dot is a new record. Record low maximum temperature15 January 2024: Record low maximum temperature -23.3 C (-9.9 F)2025
1 all-time records were set at Allerton between 15 January 2024 and 15 January 2024. Each dot is a new record.
When Allerton set new all-time records
DateKindDetail
2024-01-15Record low maximum temperatureRecord low maximum temperature -23.3 C (-9.9 F)

Wettest Day of Each Month

Aug: 235.0 mm (9.3 in)
Record daily precipitation for each month at Allerton The wettest day on record for each calendar month at Allerton. The most was 235.0 mm (9.3 in) on 27 August 1903. 0100200300 Jan: 101.6 mm (4.0 in), 21 January 2006 Jan Feb: 101.6 mm (4.0 in), 13 February 2007 Feb Mar: 57.2 mm (2.3 in), 25 March 1915 Mar Apr: 117.3 mm (4.6 in), 18 April 2013 Apr May: 103.4 mm (4.1 in), 28 May 1918 May Jun: 114.3 mm (4.5 in), 8 June 1909 Jun Jul: 165.1 mm (6.5 in), 6 July 1909 Jul Aug: 235.0 mm (9.3 in), 27 August 1903 Aug Sep: 82.0 mm (3.2 in), 27 September 2014 Sep Oct: 72.4 mm (2.9 in), 13 October 1997 Oct Nov: 75.7 mm (3.0 in), 11 November 2021 Nov Dec: 76.2 mm (3.0 in), 7 December 2007 Dec
The wettest day on record for each calendar month at Allerton. The most was 235.0 mm (9.3 in) on 27 August 1903.
Record daily precipitation for each month at Allerton
MonthRecord daily precipitation (mm)Date
Jan101.6 mm (4.0 in)21 January 2006
Feb101.6 mm (4.0 in)13 February 2007
Mar57.2 mm (2.3 in)25 March 1915
Apr117.3 mm (4.6 in)18 April 2013
May103.4 mm (4.1 in)28 May 1918
Jun114.3 mm (4.5 in)8 June 1909
Jul165.1 mm (6.5 in)6 July 1909
Aug235.0 mm (9.3 in)27 August 1903
Sep82.0 mm (3.2 in)27 September 2014
Oct72.4 mm (2.9 in)13 October 1997
Nov75.7 mm (3.0 in)11 November 2021
Dec76.2 mm (3.0 in)7 December 2007

Period of Record Coverage

1902 to 2026
Days with data per year at Allerton 50 years of record at Allerton, 1902 to 2026. 10 years have data for under 90 percent of days and are left out of rankings: 1902, 1917, 1919, 1979, 1980, 1997, 2006, 2010 and others. 1902: 213 of 365 days1903: 365 of 365 days1904: 355 of 366 days1905: 360 of 365 days1906: 365 of 365 days1907: 358 of 365 days1908: 366 of 366 days1909: 359 of 365 days1910: 359 of 365 days1911: 360 of 365 days1912: 365 of 366 days1913: 358 of 365 days1914: 358 of 365 days1915: 355 of 365 days1916: 352 of 366 days1917: 226 of 365 days1918: 332 of 365 days1919: 318 of 365 days1979: 25 of 365 days1980: 60 of 366 days1997: 84 of 365 days1998: 339 of 365 days1999: 357 of 365 days2000: 353 of 366 days2001: 349 of 365 days2002: 358 of 365 days2003: 364 of 365 days2004: 365 of 366 days2005: 340 of 365 days2006: 317 of 365 days2007: 334 of 365 days2008: 342 of 366 days2009: 349 of 365 days2010: 238 of 365 days2011: 351 of 365 days2012: 354 of 366 days2013: 349 of 365 days2014: 344 of 365 days2015: 339 of 365 days2016: 351 of 366 days2017: 343 of 365 days2018: 340 of 365 days2019: 334 of 365 days2020: 341 of 366 days2021: 324 of 365 days2022: 345 of 365 days2023: 340 of 365 days2024: 356 of 366 days2025: 338 of 365 days2026: 251 of 365 days19101980200020102020
50 years of record at Allerton, 1902 to 2026. 10 years have data for under 90 percent of days and are left out of rankings: 1902, 1917, 1919, 1979, 1980, 1997, 2006, 2010 and others.
Days with data per year at Allerton
YearDays with dataShare of yearComplete
190221358%No
1903365100%Yes
190435597%Yes
190536099%Yes
1906365100%Yes
190735898%Yes
1908366100%Yes
190935998%Yes
191035998%Yes
191136099%Yes
1912365100%Yes
191335898%Yes
191435898%Yes
191535597%Yes
191635296%Yes
191722662%No
191833291%Yes
191931887%No
1979257%No
19806016%No
19978423%No
199833993%Yes
199935798%Yes
200035396%Yes
200134996%Yes
200235898%Yes
2003364100%Yes
2004365100%Yes
200534093%Yes
200631787%No
200733492%Yes
200834293%Yes
200934996%Yes
201023865%No
201135196%Yes
201235497%Yes
201334996%Yes
201434494%Yes
201533993%Yes
201635196%Yes
201734394%Yes
201834093%Yes
201933492%Yes
202034193%Yes
202132489%No
202234595%Yes
202334093%Yes
202435697%Yes
202533893%Yes
202625169%No

Latest Records

20
Latest records at Allerton
DateStationRecordValueBeat old record byOld record stoodSignificance
11 October 2026Allerton, USdaily high max (Tie, Provisional)28.9 C (84.0 F)tie116 years10 of 100 (Routine)
10 October 2026Allerton, USdaily high max (Provisional)29.4 C (84.9 F)1.1 C (2.0 F)16 years15 of 100 (Routine)
6 September 2026Allerton, USdaily high min (Provisional)22.2 C (72.0 F)1.1 C (2.0 F)113 years42 of 100 (Notable)
4 September 2026Allerton, USdaily high min (Tie, Provisional)21.7 C (71.1 F)tie113 years10 of 100 (Routine)
1 September 2026Allerton, USdaily high min (Tie, Provisional)21.7 C (71.1 F)tie112 years10 of 100 (Routine)
13 August 2026Allerton, USdaily high min (Tie)22.8 C (73.0 F)tie16 years3 of 100 (Routine)
6 August 2026Allerton, USdaily rain63.2 mm (2.5 in)9.9 mm (0.39 in)12 years17 of 100 (Routine)
6 August 2026Allerton, USdaily low max22.8 C (73.0 F)0.5 C (0.9 F)8 years13 of 100 (Routine)
5 August 2026Allerton, USdaily rain30.5 mm (1.2 in)6.4 mm (0.25 in)124 years42 of 100 (Notable)
27 July 2026Allerton, USdaily high min24.4 C (75.9 F)2.2 C (4.0 F)112 years47 of 100 (Notable)
21 July 2026Allerton, USdaily rain53.3 mm (2.1 in)16.5 mm (0.6 in)5 years20 of 100 (Routine)
30 June 2026Allerton, USdaily high min (Tie)23.3 C (73.9 F)tie115 years10 of 100 (Routine)
22 June 2026Allerton, USdaily low max17.2 C (63.0 F)1.1 C (2.0 F)17 years17 of 100 (Routine)
12 June 2026Allerton, USdaily rain39.6 mm (1.6 in)1.5 mm (0.06 in)108 years40 of 100 (Notable)
10 June 2026Allerton, USdaily high min21.7 C (71.1 F)0.6 C (1.1 F)115 years41 of 100 (Notable)
24 April 2026Allerton, USdaily rain21.1 mm (0.8 in)2.6 mm (0.10 in)117 years20 of 100 (Routine)
22 April 2026Allerton, USdaily high max (Tie)27.2 C (81.0 F)tie111 years10 of 100 (Routine)
15 April 2026Allerton, USdaily high min14.4 C (57.9 F)1.6 C (2.9 F)23 years19 of 100 (Routine)
15 April 2026Allerton, USdaily high max (Tie)30.0 C (86.0 F)tie20 years4 of 100 (Routine)
14 April 2026Allerton, USdaily high min16.7 C (62.1 F)4.5 C (8.1 F)116 years48 of 100 (Notable)

Climate Trend

37 complete years, 1903 to 2025
Annual mean temperature at Allerton as warming stripes, 1903 to 2025 One stripe for each of 37 complete years at Allerton, 1903 to 2025. Blue stripes are years cooler than the station's own mean of 10.2 C (50.3 F); red stripes are warmer. The coolest year was 2008, at 8.4 C (47.2 F), and the warmest was 2012, at 12.0 C (53.7 F). The strongest colour marks a difference of 1.9 C (3.4 F). 1903: 9.6 C, -0.6 C from the station mean1904: 9.2 C, -0.9 C from the station mean1905: 9.8 C, -0.4 C from the station mean1906: 10.4 C, +0.3 C from the station mean1907: 10.0 C, -0.2 C from the station mean1908: 11.0 C, +0.8 C from the station mean1909: 10.1 C, -0.1 C from the station mean1910: 10.5 C, +0.4 C from the station mean1911: 11.5 C, +1.3 C from the station mean1912: 9.6 C, -0.6 C from the station mean1913: 11.5 C, +1.3 C from the station mean1914: 11.0 C, +0.8 C from the station mean1915: 10.4 C, +0.2 C from the station mean1916: 10.2 C, 0.0 C from the station mean1999: 10.2 C, +0.1 C from the station mean2000: 9.6 C, -0.5 C from the station mean2002: 9.9 C, -0.3 C from the station mean2003: 9.3 C, -0.8 C from the station mean2004: 9.4 C, -0.8 C from the station mean2005: 10.2 C, +0.1 C from the station mean2008: 8.4 C, -1.7 C from the station mean2009: 9.1 C, -1.1 C from the station mean2011: 9.9 C, -0.3 C from the station mean2012: 12.0 C, +1.9 C from the station mean2013: 9.1 C, -1.1 C from the station mean2014: 8.4 C, -1.7 C from the station mean2015: 10.5 C, +0.3 C from the station mean2016: 11.3 C, +1.1 C from the station mean2017: 11.0 C, +0.9 C from the station mean2018: 9.6 C, -0.5 C from the station mean2019: 9.2 C, -1.0 C from the station mean2020: 10.1 C, -0.1 C from the station mean2021: 10.5 C, +0.4 C from the station mean2022: 9.7 C, -0.4 C from the station mean2023: 11.2 C, +1.1 C from the station mean2024: 11.6 C, +1.4 C from the station mean2025: 10.7 C, +0.5 C from the station mean1903191019201930194019501960197019801990200020102020
One stripe for each of 37 complete years at Allerton, 1903 to 2025. Blue stripes are years cooler than the station's own mean of 10.2 C (50.3 F); red stripes are warmer. The coolest year was 2008, at 8.4 C (47.2 F), and the warmest was 2012, at 12.0 C (53.7 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Allerton as warming stripes, 1903 to 2025
YearAnnual mean temperatureDifference from the station mean
19039.6 C-0.59 C
19049.2 C-0.93 C
19059.8 C-0.35 C
190610.4 C+0.28 C
190710.0 C-0.16 C
190811.0 C+0.85 C
190910.1 C-0.05 C
191010.5 C+0.39 C
191111.5 C+1.34 C
19129.6 C-0.58 C
191311.5 C+1.35 C
191411.0 C+0.81 C
191510.4 C+0.24 C
191610.2 C+0.04 C
199910.2 C+0.09 C
20009.6 C-0.51 C
20029.9 C-0.29 C
20039.3 C-0.83 C
20049.4 C-0.78 C
200510.2 C+0.09 C
20088.4 C-1.73 C
20099.1 C-1.09 C
20119.9 C-0.28 C
201212.0 C+1.88 C
20139.1 C-1.09 C
20148.4 C-1.73 C
201510.5 C+0.35 C
201611.3 C+1.10 C
201711.0 C+0.87 C
20189.6 C-0.53 C
20199.2 C-0.99 C
202010.1 C-0.07 C
202110.5 C+0.37 C
20229.7 C-0.43 C
202311.2 C+1.09 C
202411.6 C+1.45 C
202510.7 C+0.51 C

The fitted trend in annual mean temperature here over 1903 to 2025 is -0.02 C (-0.08 to 0.04) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.04 F (-0.14 to 0.07) 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 Allerton
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.02 C (-0.08 to 0.04) per decade-0.04 F (-0.14 to 0.07) per decade1903 to 202537Not clearly different from zero
Mean daily maximum-0.03 C (-0.10 to 0.03) per decade-0.1 F (-0.2 to 0.1) per decade1903 to 202537Not clearly different from zero
Mean daily minimum-0.01 C (-0.06 to 0.05) per decade-0.01 F (-0.11 to 0.09) per decade1903 to 202537Not 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

1902 to 2026
Yearly extremes at Allerton: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.2 C (108.0 F)191135.9 C (96.5 F)50
Coldest night (TNn)-36.1 C (-33.0 F)1905-25.0 C (-13.0 F)50
Wettest day (Rx1day)235.0 mm (9.3 in)190366.5 mm (2.6 in)53
Wettest five days (Rx5day)266.5 mm (10.5 in)1909106.4 mm (4.2 in)53
Longest dry spell (CDD)46 days200223 days53

Hottest day (TXx)

Hottest day (TXx) at Allerton by year The hottest day of the year at Allerton, 1902 to 2026. The record is 42.2 C (108.0 F) in 1911, marked on the chart; the median year is 35.9 C (96.5 F). 1020304050192019401960198020002020Record: 42.2 C (108.0 F) in 1911
The hottest day of the year at Allerton, 1902 to 2026. The record is 42.2 C (108.0 F) in 1911, marked on the chart; the median year is 35.9 C (96.5 F).
Hottest day (TXx) at Allerton by year
YearHottest day (TXx)
190233.9 C (93.0 F)
190335.0 C (95.0 F)
190435.0 C (95.0 F)
190536.1 C (97.0 F)
190637.2 C (99.0 F)
190733.9 C (93.0 F)
190835.6 C (96.1 F)
190937.2 C (99.0 F)
191036.7 C (98.1 F)
191142.2 C (108.0 F)
191238.3 C (100.9 F)
191340.6 C (105.1 F)
191438.9 C (102.0 F)
191534.4 C (93.9 F)
191639.4 C (102.9 F)
191738.9 C (102.0 F)
191842.2 C (108.0 F)
191937.2 C (99.0 F)
1948n/a
1949n/a
1950n/a
197915.0 C (59.0 F)
198011.7 C (53.1 F)
199732.2 C (90.0 F)
199836.7 C (98.1 F)
199937.8 C (100.0 F)
200035.6 C (96.1 F)
200134.4 C (93.9 F)
200236.1 C (97.0 F)
200338.3 C (100.9 F)
200432.2 C (90.0 F)
200536.7 C (98.1 F)
200636.7 C (98.1 F)
200735.6 C (96.1 F)
200833.9 C (93.0 F)
200933.3 C (91.9 F)
201035.0 C (95.0 F)
201138.3 C (100.9 F)
201240.0 C (104.0 F)
201337.8 C (100.0 F)
201432.8 C (91.0 F)
201533.9 C (93.0 F)
201635.0 C (95.0 F)
201736.1 C (97.0 F)
201835.6 C (96.1 F)
201935.6 C (96.1 F)
202033.9 C (93.0 F)
202135.0 C (95.0 F)
202235.0 C (95.0 F)
202336.1 C (97.0 F)
202436.1 C (97.0 F)
202535.0 C (95.0 F)
202636.1 C (97.0 F)

Coldest night (TNn)

Coldest night (TNn) at Allerton by year The coldest night of the year at Allerton, 1902 to 2026. The record is -36.1 C (-33.0 F) in 1905, marked on the chart; the median year is -25.0 C (-13.0 F). -40-30-20-10192019401960198020002020Record: -36.1 C (-33.0 F) in 1905
The coldest night of the year at Allerton, 1902 to 2026. The record is -36.1 C (-33.0 F) in 1905, marked on the chart; the median year is -25.0 C (-13.0 F).
Coldest night (TNn) at Allerton by year
YearColdest night (TNn)
1902-21.7 C (-7.1 F)
1903-26.7 C (-16.1 F)
1904-29.4 C (-20.9 F)
1905-36.1 C (-33.0 F)
1906-21.7 C (-7.1 F)
1907-25.0 C (-13.0 F)
1908-21.7 C (-7.1 F)
1909-25.0 C (-13.0 F)
1910-28.3 C (-18.9 F)
1911-24.4 C (-11.9 F)
1912-33.9 C (-29.0 F)
1913-25.0 C (-13.0 F)
1914-25.6 C (-14.1 F)
1915-28.9 C (-20.0 F)
1916-28.9 C (-20.0 F)
1917-28.9 C (-20.0 F)
1918-30.0 C (-22.0 F)
1919-29.4 C (-20.9 F)
1948n/a
1949n/a
1950n/a
1979-20.0 C (-4.0 F)
1980-22.8 C (-9.0 F)
1997-14.4 C (6.1 F)
1998-25.0 C (-13.0 F)
1999-29.4 C (-20.9 F)
2000-23.9 C (-11.0 F)
2001-24.4 C (-11.9 F)
2002-20.6 C (-5.1 F)
2003-23.3 C (-9.9 F)
2004-26.1 C (-15.0 F)
2005-22.2 C (-8.0 F)
2006-20.6 C (-5.1 F)
2007-22.8 C (-9.0 F)
2008-26.7 C (-16.1 F)
2009-26.1 C (-15.0 F)
2010-26.7 C (-16.1 F)
2011-23.9 C (-11.0 F)
2012-16.1 C (3.0 F)
2013-27.2 C (-17.0 F)
2014-25.0 C (-13.0 F)
2015-25.6 C (-14.1 F)
2016-26.7 C (-16.1 F)
2017-24.4 C (-11.9 F)
2018-29.4 C (-20.9 F)
2019-29.4 C (-20.9 F)
2020-23.3 C (-9.9 F)
2021-26.1 C (-15.0 F)
2022-24.4 C (-11.9 F)
2023-18.3 C (-0.9 F)
2024-28.9 C (-20.0 F)
2025-26.1 C (-15.0 F)
2026-23.3 C (-9.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Allerton by year The wettest day of the year at Allerton, 1902 to 2026. The record is 235.0 mm (9.3 in) in 1903, marked on the chart; the median year is 66.5 mm (2.6 in). 0100200300192019401960198020002020Record: 235.0 mm (9.3 in) in 1903
The wettest day of the year at Allerton, 1902 to 2026. The record is 235.0 mm (9.3 in) in 1903, marked on the chart; the median year is 66.5 mm (2.6 in).
Wettest day (Rx1day) at Allerton by year
YearWettest day (Rx1day)
1902170.2 mm (6.7 in)
1903235.0 mm (9.3 in)
190438.9 mm (1.5 in)
190595.0 mm (3.7 in)
190666.5 mm (2.6 in)
190762.2 mm (2.4 in)
190858.9 mm (2.3 in)
1909165.1 mm (6.5 in)
191035.6 mm (1.4 in)
191150.8 mm (2.0 in)
191261.7 mm (2.4 in)
191377.0 mm (3.0 in)
191463.5 mm (2.5 in)
191568.3 mm (2.7 in)
191656.9 mm (2.2 in)
191750.8 mm (2.0 in)
1918103.4 mm (4.1 in)
191966.0 mm (2.6 in)
194832.8 mm (1.3 in)
194970.6 mm (2.8 in)
1950110.0 mm (4.3 in)
19790.3 mm (0.01 in)
19808.9 mm (0.35 in)
199772.4 mm (2.9 in)
199863.8 mm (2.5 in)
199958.4 mm (2.3 in)
200061.0 mm (2.4 in)
200161.5 mm (2.4 in)
200269.1 mm (2.7 in)
200364.0 mm (2.5 in)
200488.4 mm (3.5 in)
200568.6 mm (2.7 in)
2006101.6 mm (4.0 in)
2007174.0 mm (6.9 in)
2008101.6 mm (4.0 in)
2009166.4 mm (6.6 in)
2010108.0 mm (4.3 in)
201157.9 mm (2.3 in)
201238.1 mm (1.5 in)
2013117.3 mm (4.6 in)
201490.7 mm (3.6 in)
201584.6 mm (3.3 in)
201634.0 mm (1.3 in)
201765.3 mm (2.6 in)
201862.5 mm (2.5 in)
2019102.9 mm (4.1 in)
202054.6 mm (2.1 in)
202175.7 mm (3.0 in)
202271.6 mm (2.8 in)
202349.0 mm (1.9 in)
202492.2 mm (3.6 in)
202577.5 mm (3.1 in)
202663.2 mm (2.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Allerton by year The wettest five days of the year at Allerton, 1902 to 2026. The record is 266.5 mm (10.5 in) in 1909, marked on the chart; the median year is 106.4 mm (4.2 in). 0100200300192019401960198020002020Record: 266.5 mm (10.5 in) in 1909
The wettest five days of the year at Allerton, 1902 to 2026. The record is 266.5 mm (10.5 in) in 1909, marked on the chart; the median year is 106.4 mm (4.2 in).
Wettest five days (Rx5day) at Allerton by year
YearWettest five days (Rx5day)
1902177.3 mm (7.0 in)
1903246.1 mm (9.7 in)
190468.6 mm (2.7 in)
1905126.3 mm (5.0 in)
190669.8 mm (2.7 in)
190772.6 mm (2.9 in)
1908110.9 mm (4.4 in)
1909266.5 mm (10.5 in)
191052.4 mm (2.1 in)
1911104.6 mm (4.1 in)
191275.2 mm (3.0 in)
191386.9 mm (3.4 in)
1914106.4 mm (4.2 in)
1915147.0 mm (5.8 in)
1916108.5 mm (4.3 in)
1917152.4 mm (6.0 in)
1918129.6 mm (5.1 in)
191975.0 mm (3.0 in)
194833.3 mm (1.3 in)
1949112.0 mm (4.4 in)
1950223.8 mm (8.8 in)
19790.3 mm (0.01 in)
19808.9 mm (0.35 in)
199799.3 mm (3.9 in)
199896.0 mm (3.8 in)
199984.1 mm (3.3 in)
2000130.8 mm (5.1 in)
200195.9 mm (3.8 in)
200294.3 mm (3.7 in)
2003127.7 mm (5.0 in)
2004191.0 mm (7.5 in)
200581.8 mm (3.2 in)
2006254.0 mm (10.0 in)
2007236.7 mm (9.3 in)
2008218.5 mm (8.6 in)
2009166.4 mm (6.6 in)
2010141.0 mm (5.6 in)
201197.3 mm (3.8 in)
201262.0 mm (2.4 in)
2013132.6 mm (5.2 in)
2014137.4 mm (5.4 in)
2015123.7 mm (4.9 in)
201645.8 mm (1.8 in)
201794.7 mm (3.7 in)
2018148.1 mm (5.8 in)
2019166.3 mm (6.5 in)
202082.1 mm (3.2 in)
202198.2 mm (3.9 in)
202279.8 mm (3.1 in)
2023125.2 mm (4.9 in)
2024119.6 mm (4.7 in)
202577.5 mm (3.1 in)
202695.0 mm (3.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Allerton by year The longest dry spell of the year at Allerton, 1902 to 2026. The record is 46 days in 2002, marked on the chart; the median year is 23 days. 1020304050192019401960198020002020Record: 46 days in 2002
The longest dry spell of the year at Allerton, 1902 to 2026. The record is 46 days in 2002, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Allerton by year
YearLongest dry spell (CDD)
190213 days
190316 days
190430 days
190520 days
190634 days
190718 days
190825 days
190924 days
191033 days
191118 days
191230 days
191330 days
191423 days
191523 days
191628 days
191736 days
191829 days
191925 days
194819 days
194927 days
195012 days
197931 days
198014 days
199717 days
199826 days
199937 days
200024 days
200123 days
200246 days
200315 days
200425 days
200524 days
200619 days
200726 days
200815 days
200923 days
201026 days
201115 days
201222 days
201316 days
201429 days
201518 days
201627 days
201728 days
201821 days
201914 days
202022 days
202117 days
202213 days
202321 days
202426 days
202520 days
202618 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

37 years with a frost

Across 37 years with a frost, the median last spring frost at Allerton falls on 23 April and the median first autumn frost on 13 October, which leaves a median of 176 days between them.

Fitted over all years, the growing season changes by +1.5 days per decade at this station.

Frost dates and growing season at Allerton
MeasureMedian, all yearsEarliest periodRecent period (1910 to 2025)Recent against earliestFitted trend
Last spring frost23 Apriln/a22 Apriln/a-0.7 days per decade
First autumn frost13 Octobern/a15 Octobern/a+0.8 days per decade
Growing days176 daysn/a177 daysn/a+1.5 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

37 years, 1903 to 2025

A day with at least 65.7 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 244.0 mm (9.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Allerton: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years65.7 mm (2.6 in)
5 years92.6 mm (3.6 in)
10 years116.8 mm (4.6 in)
25 years156.9 mm (6.2 in)
50 years195.7 mm (7.7 in)Longer than the 37 years of record
100 years244.0 mm (9.6 in)Longer than the 37 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, 37 years of values from 1903 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: 235.0 mm (9.3 in) in 1903; 166.4 mm (6.6 in) in 2009; 165.1 mm (6.5 in) in 1909.

Download the Data

  • Data for Allerton standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Allerton 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).