Built 2026-10-19 (19 October 2026)

Koslan Weather Records (RSM00022695)

Record envelope, standing records and threshold days for Koslan (RSM00022695), Russia, with 67 years of record.

Key Facts for Koslan

  • Koslan (RSM00022695) is a weather station in Russia at 63.45 latitude and 48.90 longitude, 158 m (518 ft) above sea level.
  • The station reports from 1959 to 2025, 67 years of record.
  • 1,464 records set at Koslan still stand.
  • Records are tracked for tmax, prcp: an element needs 30 years of data to be eligible.
  • Koslan set a daily record precipitation of 20.1 mm (0.8 in) on 21 August 2025.

About the Station

  • Location: Russia, 63.45 latitude, 48.90 longitude.
  • Elevation: 158 m (518 ft).
  • Period of record: 1959 to 2025, 67 years.
  • Eligible elements: tmax, prcp.

Daily Record Envelope and 2026

13 days at or beyond a record
Daily record high and record low at Koslan, with 2026 drawn through them The band shows the record high and record low for each calendar day at Koslan. The lines show the 2026 daily maximum and minimum. 13 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -60-40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Koslan. The lines show the 2026 daily maximum and minimum. 13 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Koslan, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan7.8 C (46.0 F)-48.0 C (-54.4 F)0.4 C (32.7 F)-30.7 C (-23.3 F)
Feb5.4 C (41.7 F)-46.1 C (-51.0 F)2.5 C (36.5 F)-31.7 C (-25.1 F)
Mar12.4 C (54.3 F)-42.2 C (-44.0 F)10.2 C (50.4 F)-14.4 C (6.1 F)
Apr21.1 C (70.0 F)-25.5 C (-13.9 F)17.0 C (62.6 F)-16.0 C (3.2 F)
May31.3 C (88.3 F)-13.9 C (7.0 F)29.4 C (84.9 F)-6.2 C (20.8 F)
Jun33.8 C (92.8 F)-8.0 C (17.6 F)24.3 C (75.7 F)2.6 C (36.7 F)
Jul33.3 C (91.9 F)-0.1 C (31.8 F)28.1 C (82.6 F)6.2 C (43.2 F)
Aug33.3 C (91.9 F)-8.0 C (17.6 F)30.4 C (86.7 F)1.1 C (34.0 F)
Sep26.1 C (79.0 F)-11.2 C (11.8 F)n/an/a
Oct19.0 C (66.2 F)-20.2 C (-4.4 F)n/an/a
Nov8.5 C (47.3 F)-35.0 C (-31.0 F)n/an/a
Dec8.0 C (46.4 F)-43.9 C (-47.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Koslan by the year they were set 1,464 records at Koslan still stand. 1969 holds the most, with 56. 02040601960: 41964: 311965: 171966: 421967: 281968: 521969: 561970: 201971: 111973: 61974: 51975: 81976: 21977: 41978: 71979: 181980: 121981: 201982: 211983: 201984: 171985: 161986: 181987: 231988: 281989: 241990: 381991: 391992: 511993: 281994: 201995: 281996: 381997: 411998: 541999: 492000: 362001: 22007: 152008: 282009: 222010: 442011: 342012: 162013: 212014: 232015: 302016: 282017: 272018: 212019: 212020: 352021: 452022: 272023: 292024: 402025: 241960196919761982198819942000201120172023
1,464 records at Koslan still stand. 1969 holds the most, with 56.
Standing records at Koslan by the year they were set
Year setStanding records
19604
196431
196517
196642
196728
196852
196956
197020
197111
19736
19745
19758
19762
19774
19787
197918
198012
198120
198221
198320
198417
198516
198618
198723
198828
198924
199038
199139
199251
199328
199420
199528
199638
199741
199854
199949
200036
20012
200715
200828
200922
201044
201134
201216
201321
201423
201530
201628
201727
201821
201921
202035
202145
202227
202329
202440
202524

Wettest Day of Each Month

Oct: 79.0 mm (3.1 in)
Record daily precipitation for each month at Koslan The wettest day on record for each calendar month at Koslan. The most was 79.0 mm (3.1 in) on 18 October 1967. 020406080 Jan: 27.2 mm (1.1 in), 4 January 2020 Jan Feb: 17.0 mm (0.7 in), 3 February 1995 Feb Mar: 11.9 mm (0.5 in), 28 March 1995 Mar Apr: 30.5 mm (1.2 in), 6 April 1982 Apr May: 29.1 mm (1.1 in), 25 May 1970 May Jun: 37.7 mm (1.5 in), 29 June 1982 Jun Jul: 40.5 mm (1.6 in), 16 July 1972 Jul Aug: 74.5 mm (2.9 in), 8 August 1987 Aug Sep: 68.1 mm (2.7 in), 24 September 1998 Sep Oct: 79.0 mm (3.1 in), 18 October 1967 Oct Nov: 23.9 mm (0.9 in), 8 November 2013 Nov Dec: 13.2 mm (0.5 in), 14 December 1965 Dec
The wettest day on record for each calendar month at Koslan. The most was 79.0 mm (3.1 in) on 18 October 1967.
Record daily precipitation for each month at Koslan
MonthRecord daily precipitation (mm)Date
Jan27.2 mm (1.1 in)4 January 2020
Feb17.0 mm (0.7 in)3 February 1995
Mar11.9 mm (0.5 in)28 March 1995
Apr30.5 mm (1.2 in)6 April 1982
May29.1 mm (1.1 in)25 May 1970
Jun37.7 mm (1.5 in)29 June 1982
Jul40.5 mm (1.6 in)16 July 1972
Aug74.5 mm (2.9 in)8 August 1987
Sep68.1 mm (2.7 in)24 September 1998
Oct79.0 mm (3.1 in)18 October 1967
Nov23.9 mm (0.9 in)8 November 2013
Dec13.2 mm (0.5 in)14 December 1965

Period of Record Coverage

1959 to 2025
Days with data per year at Koslan 61 years of record at Koslan, 1959 to 2025. 61 years have data for under 90 percent of days and are left out of rankings: 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 and others. 1959: 4 of 365 days1960: 14 of 366 days1961: 28 of 365 days1962: 6 of 365 days1963: 2 of 365 days1964: 254 of 366 days1965: 185 of 365 days1966: 212 of 365 days1967: 244 of 365 days1968: 251 of 366 days1969: 238 of 365 days1970: 213 of 365 days1971: 45 of 365 days1973: 63 of 365 days1974: 62 of 365 days1975: 90 of 365 days1976: 9 of 366 days1977: 10 of 365 days1978: 9 of 365 days1979: 63 of 365 days1980: 106 of 366 days1981: 141 of 365 days1982: 74 of 365 days1983: 129 of 365 days1984: 168 of 366 days1985: 155 of 365 days1986: 143 of 365 days1987: 181 of 365 days1988: 205 of 366 days1989: 212 of 365 days1990: 246 of 365 days1991: 264 of 365 days1992: 261 of 366 days1993: 217 of 365 days1994: 165 of 365 days1995: 186 of 365 days1996: 228 of 366 days1997: 256 of 365 days1998: 232 of 365 days1999: 251 of 365 days2000: 279 of 366 days2001: 23 of 365 days2007: 125 of 365 days2008: 274 of 366 days2009: 286 of 365 days2010: 284 of 365 days2011: 295 of 365 days2012: 279 of 366 days2013: 84 of 365 days2014: 17 of 365 days2015: 267 of 365 days2016: 283 of 366 days2017: 270 of 365 days2018: 274 of 365 days2019: 275 of 365 days2020: 269 of 366 days2021: 282 of 365 days2022: 275 of 365 days2023: 277 of 365 days2024: 281 of 366 days2025: 191 of 365 days1960197019801990200020102020
61 years of record at Koslan, 1959 to 2025. 61 years have data for under 90 percent of days and are left out of rankings: 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 and others.
Days with data per year at Koslan
YearDays with dataShare of yearComplete
195941%No
1960144%No
1961288%No
196262%No
196321%No
196425469%No
196518551%No
196621258%No
196724467%No
196825169%No
196923865%No
197021358%No
19714512%No
19736317%No
19746217%No
19759025%No
197692%No
1977103%No
197892%No
19796317%No
198010629%No
198114139%No
19827420%No
198312935%No
198416846%No
198515542%No
198614339%No
198718150%No
198820556%No
198921258%No
199024667%No
199126472%No
199226171%No
199321759%No
199416545%No
199518651%No
199622862%No
199725670%No
199823264%No
199925169%No
200027976%No
2001236%No
200712534%No
200827475%No
200928678%No
201028478%No
201129581%No
201227976%No
20138423%No
2014175%No
201526773%No
201628377%No
201727074%No
201827475%No
201927575%No
202026973%No
202128277%No
202227575%No
202327776%No
202428177%No
202519152%No

Latest Records

20
Latest records at Koslan
DateStationRecordValueBeat old record byOld record stoodSignificance
21 August 2025Koslan, RUdaily rain20.1 mm (0.8 in)2.0 mm (0.08 in)40 years20 of 100 (Routine)
1 August 2025Koslan, RUdaily high max30.4 C (86.7 F)0.9 C (1.6 F)15 years11 of 100 (Routine)
15 July 2025Koslan, RUdaily low max12.8 C (55.0 F)1.2 C (2.2 F)52 years23 of 100 (Routine)
28 June 2025Koslan, RUdaily rain21.1 mm (0.8 in)0.9 mm (0.04 in)32 years16 of 100 (Routine)
24 June 2025Koslan, RUdaily rain18.0 mm (0.7 in)2.7 mm (0.11 in)64 years20 of 100 (Routine)
30 May 2025Koslan, RUdaily high max29.4 C (84.9 F)2.4 C (4.3 F)10 years12 of 100 (Routine)
29 May 2025Koslan, RUdaily high max27.4 C (81.3 F)0.2 C (0.4 F)59 years23 of 100 (Routine)
27 May 2025Koslan, RUdaily high max26.7 C (80.1 F)0.7 C (1.3 F)46 years19 of 100 (Routine)
26 May 2025Koslan, RUdaily high max27.5 C (81.5 F)0.5 C (0.9 F)46 years19 of 100 (Routine)
18 April 2025Koslan, RUdaily high max17.0 C (62.6 F)1.1 C (2.0 F)26 years15 of 100 (Routine)
15 April 2025Koslan, RUdaily high max12.5 C (54.5 F)0.8 C (1.4 F)0 years7 of 100 (Routine)
31 March 2025Koslan, RUdaily high max (Tie)9.4 C (48.9 F)tie8 years2 of 100 (Routine)
25 March 2025Koslan, RUdaily high max9.1 C (48.4 F)0.2 C (0.4 F)40 years18 of 100 (Routine)
24 March 2025Koslan, RUdaily high max8.9 C (48.0 F)0.6 C (1.1 F)40 years19 of 100 (Routine)
17 March 2025Koslan, RUdaily rain3.6 mm (0.14 in)0.1 mm (0.00 in)48 years20 of 100 (Routine)
31 January 2025Koslan, RUdaily high max0.4 C (32.7 F)0.6 C (1.1 F)30 years15 of 100 (Routine)
12 January 2025Koslan, RUdaily rain8.9 mm (0.35 in)1.2 mm (0.05 in)34 years20 of 100 (Routine)
9 January 2025Koslan, RUdaily rain8.9 mm (0.35 in)0.1 mm (0.00 in)34 years16 of 100 (Routine)
28 December 2024Koslan, RUdaily high max (Tie)-0.7 C (30.7 F)tie39 years4 of 100 (Routine)
16 December 2024Koslan, RUdaily low max-22.4 C (-8.3 F)8.3 C (14.9 F)36 years26 of 100 (Routine)

Extremes by Year

1959 to 2025
Yearly extremes at Koslan: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)33.8 C (92.8 F)199830.0 C (86.0 F)61
Coldest night (TNn)-48.0 C (-54.4 F)1973-36.9 C (-34.5 F)60
Wettest day (Rx1day)79.0 mm (3.1 in)196728.6 mm (1.1 in)55
Wettest five days (Rx5day)107.6 mm (4.2 in)196748.9 mm (1.9 in)53
Longest dry spell (CDD)47 days199615 days55

Hottest day (TXx)

Hottest day (TXx) at Koslan by year The hottest day of the year at Koslan, 1959 to 2025. The record is 33.8 C (92.8 F) in 1998, marked on the chart; the median year is 30.0 C (86.0 F). -100102030401960198020002020Record: 33.8 C (92.8 F) in 1998
The hottest day of the year at Koslan, 1959 to 2025. The record is 33.8 C (92.8 F) in 1998, marked on the chart; the median year is 30.0 C (86.0 F).
Hottest day (TXx) at Koslan by year
YearHottest day (TXx)
195921.1 C (70.0 F)
196026.1 C (79.0 F)
196131.1 C (88.0 F)
196212.8 C (55.0 F)
1963-3.9 C (25.0 F)
196431.1 C (88.0 F)
196528.9 C (84.0 F)
196632.8 C (91.0 F)
196730.0 C (86.0 F)
196831.1 C (88.0 F)
196927.8 C (82.0 F)
197031.1 C (88.0 F)
197122.2 C (72.0 F)
1972n/a
197331.0 C (87.8 F)
197430.0 C (86.0 F)
197529.0 C (84.2 F)
19762.0 C (35.6 F)
19774.0 C (39.2 F)
197818.0 C (64.4 F)
197927.0 C (80.6 F)
198029.0 C (84.2 F)
198131.0 C (87.8 F)
198231.5 C (88.7 F)
198330.2 C (86.4 F)
198430.9 C (87.6 F)
198531.6 C (88.9 F)
198628.8 C (83.8 F)
198728.5 C (83.3 F)
198831.6 C (88.9 F)
198930.1 C (86.2 F)
199031.6 C (88.9 F)
199130.3 C (86.5 F)
199228.5 C (83.3 F)
199326.1 C (79.0 F)
199426.4 C (79.5 F)
199530.1 C (86.2 F)
199632.1 C (89.8 F)
199729.3 C (84.7 F)
199833.8 C (92.8 F)
199931.4 C (88.5 F)
200032.9 C (91.2 F)
20010.0 C (32.0 F)
200729.4 C (84.9 F)
200830.6 C (87.1 F)
200928.6 C (83.5 F)
201033.3 C (91.9 F)
201133.3 C (91.9 F)
201228.0 C (82.4 F)
201321.8 C (71.2 F)
201420.8 C (69.4 F)
201529.3 C (84.7 F)
201631.0 C (87.8 F)
201729.8 C (85.6 F)
201830.4 C (86.7 F)
201930.7 C (87.3 F)
202029.7 C (85.5 F)
202130.6 C (87.1 F)
202232.6 C (90.7 F)
202329.5 C (85.1 F)
202430.6 C (87.1 F)
202530.4 C (86.7 F)

Coldest night (TNn)

Coldest night (TNn) at Koslan by year The coldest night of the year at Koslan, 1959 to 2025. The record is -48.0 C (-54.4 F) in 1973, marked on the chart; the median year is -36.9 C (-34.5 F). -60-40-200201960198020002020Record: -48.0 C (-54.4 F) in 1973
The coldest night of the year at Koslan, 1959 to 2025. The record is -48.0 C (-54.4 F) in 1973, marked on the chart; the median year is -36.9 C (-34.5 F).
Coldest night (TNn) at Koslan by year
YearColdest night (TNn)
1959-8.9 C (16.0 F)
1960-35.0 C (-31.0 F)
19617.8 C (46.0 F)
1962-18.9 C (-2.0 F)
1963n/a
1964-42.2 C (-44.0 F)
1965-38.9 C (-38.0 F)
1966-46.1 C (-51.0 F)
1967-42.8 C (-45.0 F)
1968-43.9 C (-47.0 F)
1969-46.1 C (-51.0 F)
1970-43.9 C (-47.0 F)
1971-37.8 C (-36.0 F)
1972n/a
1973-48.0 C (-54.4 F)
1974-30.0 C (-22.0 F)
1975-35.0 C (-31.0 F)
1976-28.0 C (-18.4 F)
1977-32.0 C (-25.6 F)
1978-34.0 C (-29.2 F)
1979-33.0 C (-27.4 F)
1980-30.0 C (-22.0 F)
1981-32.0 C (-25.6 F)
1982-37.9 C (-36.2 F)
1983-30.9 C (-23.6 F)
1984-33.6 C (-28.5 F)
1985-33.8 C (-28.8 F)
1986-40.7 C (-41.3 F)
1987-43.6 C (-46.5 F)
1988-31.5 C (-24.7 F)
1989-36.7 C (-34.1 F)
1990-38.5 C (-37.3 F)
1991-40.1 C (-40.2 F)
1992-38.3 C (-36.9 F)
1993-39.2 C (-38.6 F)
1994-34.0 C (-29.2 F)
1995-23.8 C (-10.8 F)
1996-40.2 C (-40.4 F)
1997-39.5 C (-39.1 F)
1998-42.5 C (-44.5 F)
1999-45.1 C (-49.2 F)
2000-38.3 C (-36.9 F)
2001-32.6 C (-26.7 F)
2007-23.5 C (-10.3 F)
2008-29.7 C (-21.5 F)
2009-43.3 C (-45.9 F)
2010-39.1 C (-38.4 F)
2011-37.4 C (-35.3 F)
2012-37.6 C (-35.7 F)
2013-32.9 C (-27.2 F)
2014-35.4 C (-31.7 F)
2015-35.6 C (-32.1 F)
2016-37.2 C (-35.0 F)
2017-41.6 C (-42.9 F)
2018-29.2 C (-20.6 F)
2019-32.5 C (-26.5 F)
2020-36.4 C (-33.5 F)
2021-39.7 C (-39.5 F)
2022-34.3 C (-29.7 F)
2023-40.3 C (-40.5 F)
2024-39.9 C (-39.8 F)
2025-31.7 C (-25.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Koslan by year The wettest day of the year at Koslan, 1959 to 2025. The record is 79.0 mm (3.1 in) in 1967, marked on the chart; the median year is 28.6 mm (1.1 in). 0204060801960198020002020Record: 79.0 mm (3.1 in) in 1967
The wettest day of the year at Koslan, 1959 to 2025. The record is 79.0 mm (3.1 in) in 1967, marked on the chart; the median year is 28.6 mm (1.1 in).
Wettest day (Rx1day) at Koslan by year
YearWettest day (Rx1day)
195914.1 mm (0.6 in)
196049.4 mm (1.9 in)
196122.3 mm (0.9 in)
196233.7 mm (1.3 in)
196322.1 mm (0.9 in)
196421.3 mm (0.8 in)
196530.2 mm (1.2 in)
196629.2 mm (1.1 in)
196779.0 mm (3.1 in)
196817.3 mm (0.7 in)
196917.9 mm (0.7 in)
197036.9 mm (1.5 in)
197132.0 mm (1.3 in)
197240.5 mm (1.6 in)
197328.6 mm (1.1 in)
197418.0 mm (0.7 in)
197528.8 mm (1.1 in)
197656.8 mm (2.2 in)
197733.3 mm (1.3 in)
197822.1 mm (0.9 in)
197920.1 mm (0.8 in)
198028.8 mm (1.1 in)
198120.2 mm (0.8 in)
198237.7 mm (1.5 in)
198321.1 mm (0.8 in)
198439.1 mm (1.5 in)
198526.0 mm (1.0 in)
198631.1 mm (1.2 in)
198774.5 mm (2.9 in)
198829.2 mm (1.1 in)
198939.2 mm (1.5 in)
199039.1 mm (1.5 in)
199134.6 mm (1.4 in)
199222.9 mm (0.9 in)
199331.4 mm (1.2 in)
199421.2 mm (0.8 in)
199524.0 mm (0.9 in)
199626.2 mm (1.0 in)
199721.1 mm (0.8 in)
199868.1 mm (2.7 in)
199947.0 mm (1.9 in)
2000n/a
2001n/a
2007n/a
2008n/a
2009n/a
2010n/a
2011n/a
201216.0 mm (0.6 in)
201350.0 mm (2.0 in)
201419.1 mm (0.8 in)
201536.1 mm (1.4 in)
201620.1 mm (0.8 in)
201731.0 mm (1.2 in)
201824.9 mm (1.0 in)
201921.6 mm (0.9 in)
202027.2 mm (1.1 in)
202124.9 mm (1.0 in)
202211.9 mm (0.5 in)
202316.0 mm (0.6 in)
202430.0 mm (1.2 in)
202522.1 mm (0.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Koslan by year The wettest five days of the year at Koslan, 1959 to 2025. The record is 107.6 mm (4.2 in) in 1967, marked on the chart; the median year is 48.9 mm (1.9 in). 02550751001251960198020002020Record: 107.6 mm (4.2 in) in 1967
The wettest five days of the year at Koslan, 1959 to 2025. The record is 107.6 mm (4.2 in) in 1967, marked on the chart; the median year is 48.9 mm (1.9 in).
Wettest five days (Rx5day) at Koslan by year
YearWettest five days (Rx5day)
195930.9 mm (1.2 in)
196064.9 mm (2.6 in)
196129.4 mm (1.2 in)
196244.0 mm (1.7 in)
196350.9 mm (2.0 in)
196430.5 mm (1.2 in)
196554.6 mm (2.1 in)
196642.2 mm (1.7 in)
1967107.6 mm (4.2 in)
196822.7 mm (0.9 in)
196938.6 mm (1.5 in)
197052.5 mm (2.1 in)
197161.1 mm (2.4 in)
197248.9 mm (1.9 in)
197354.4 mm (2.1 in)
197435.9 mm (1.4 in)
197562.1 mm (2.4 in)
197666.8 mm (2.6 in)
197759.8 mm (2.4 in)
197836.6 mm (1.4 in)
197935.6 mm (1.4 in)
198063.3 mm (2.5 in)
198150.2 mm (2.0 in)
198250.6 mm (2.0 in)
198346.7 mm (1.8 in)
198453.2 mm (2.1 in)
198545.2 mm (1.8 in)
198655.7 mm (2.2 in)
198780.4 mm (3.2 in)
198830.0 mm (1.2 in)
198953.6 mm (2.1 in)
199057.3 mm (2.3 in)
199150.2 mm (2.0 in)
199233.1 mm (1.3 in)
199354.4 mm (2.1 in)
199441.9 mm (1.6 in)
199551.9 mm (2.0 in)
199639.0 mm (1.5 in)
1997n/a
199819.8 mm (0.8 in)
199957.9 mm (2.3 in)
2000n/a
2001n/a
2007n/a
2008n/a
2009n/a
2010n/a
2011n/a
201233.0 mm (1.3 in)
201320.0 mm (0.8 in)
2014n/a
201550.5 mm (2.0 in)
201646.5 mm (1.8 in)
201763.1 mm (2.5 in)
201842.9 mm (1.7 in)
201967.6 mm (2.7 in)
202032.0 mm (1.3 in)
202145.7 mm (1.8 in)
202227.7 mm (1.1 in)
202332.6 mm (1.3 in)
202448.3 mm (1.9 in)
202580.3 mm (3.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Koslan by year The longest dry spell of the year at Koslan, 1959 to 2025. The record is 47 days in 1996, marked on the chart; the median year is 15 days. 02040601960198020002020Record: 47 days in 1996
The longest dry spell of the year at Koslan, 1959 to 2025. The record is 47 days in 1996, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Koslan by year
YearLongest dry spell (CDD)
195912 days
196024 days
196110 days
196211 days
196326 days
196412 days
196521 days
196619 days
196716 days
196814 days
196925 days
197020 days
197122 days
197212 days
197323 days
197429 days
197517 days
197620 days
197712 days
197822 days
197919 days
198019 days
198118 days
198212 days
198314 days
198425 days
198521 days
198617 days
198723 days
198818 days
198917 days
199019 days
199115 days
199214 days
199321 days
199414 days
19958 days
199647 days
19971 day
19983 days
199910 days
2000n/a
2001n/a
2007n/a
2008n/a
2009n/a
2010n/a
2011n/a
201210 days
20139 days
20142 days
201513 days
201615 days
20179 days
201815 days
201911 days
202014 days
202111 days
202218 days
202315 days
202412 days
20259 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

40 years, 1960 to 2024

A day with at least 27.7 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 84.0 mm (3.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Koslan: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years27.7 mm (1.1 in)
5 years39.0 mm (1.5 in)
10 years47.8 mm (1.9 in)
25 years60.7 mm (2.4 in)
50 years71.7 mm (2.8 in)Longer than the 40 years of record
100 years84.0 mm (3.3 in)Longer than the 40 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, 40 years of values from 1960 to 2024.

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: 79.0 mm (3.1 in) in 1967; 74.5 mm (2.9 in) in 1987; 56.8 mm (2.2 in) in 1976.

Download the Data

  • Data for Koslan standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Koslan 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).