Daily records
Page built 2026-10-17
Data as of 2026-10-15
Search
Built 2026-10-17 (17 October 2026)

Port Heiden Weather Records (USW00025508)

Record envelope, standing records and threshold days for Port Heiden (USW00025508), Alaska, United States, with 85 years of record.

Key Facts for Port Heiden

  • Port Heiden (USW00025508) is a weather station in Alaska, United States at 56.95 latitude and -158.62 longitude, 28 m (92 ft) above sea level.
  • The station reports from 1942 to 2026, 85 years of record.
  • 1,464 records set at Port Heiden still stand.
  • Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
  • Port Heiden set a daily record low minimum temperature of -3.9 C (25.0 F) on 2 October 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Alaska, United States, 56.95 latitude, -158.62 longitude.
  • Elevation: 28 m (92 ft).
  • Period of record: 1942 to 2026, 85 years.
  • Eligible elements: tmax, tmin, prcp, snow.

Daily Record Envelope and 2026

12 days at or beyond a record
Daily record high and record low at Port Heiden, with 2026 drawn through them The band shows the record high and record low for each calendar day at Port Heiden. The lines show the 2026 daily maximum and minimum. 12 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 Port Heiden. The lines show the 2026 daily maximum and minimum. 12 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Port Heiden, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan13.9 C (57.0 F)-31.7 C (-25.1 F)n/an/a
Feb12.8 C (55.0 F)-30.0 C (-22.0 F)n/an/a
Mar12.2 C (54.0 F)-32.2 C (-26.0 F)3.3 C (37.9 F)-23.9 C (-11.0 F)
Apr16.7 C (62.1 F)-21.1 C (-6.0 F)11.7 C (53.1 F)-6.7 C (19.9 F)
May23.9 C (75.0 F)-11.7 C (10.9 F)11.7 C (53.1 F)-6.7 C (19.9 F)
Jun27.2 C (81.0 F)-3.9 C (25.0 F)18.9 C (66.0 F)-2.2 C (28.0 F)
Jul30.6 C (87.1 F)0.0 C (32.0 F)19.4 C (66.9 F)3.9 C (39.0 F)
Aug27.8 C (82.0 F)-0.6 C (30.9 F)20.6 C (69.1 F)5.6 C (42.1 F)
Sep22.8 C (73.0 F)-4.4 C (24.1 F)21.1 C (70.0 F)2.8 C (37.0 F)
Oct17.8 C (64.0 F)-18.3 C (-0.9 F)12.8 C (55.0 F)-3.9 C (25.0 F)
Nov12.8 C (55.0 F)-25.0 C (-13.0 F)n/an/a
Dec15.0 C (59.0 F)-30.0 C (-22.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Port Heiden by the year they were set 1,464 records at Port Heiden still stand. 1971 holds the most, with 94. 02550751001942: 411943: 441944: 241947: 101948: 401949: 321950: 241951: 181952: 61957: 341958: 211959: 311960: 311961: 491962: 321963: 501964: 231965: 301966: 191967: 481968: 401969: 161970: 301971: 941972: 551973: 461974: 361975: 561976: 351977: 91978: 171979: 641980: 201981: 241982: 501983: 281984: 261985: 451986: 541987: 291988: 252025: 462026: 12194219491958196319681973197819831988
1,464 records at Port Heiden still stand. 1971 holds the most, with 94.
Standing records at Port Heiden by the year they were set
Year setStanding records
194241
194344
194424
194710
194840
194932
195024
195118
19526
195734
195821
195931
196031
196149
196232
196350
196423
196530
196619
196748
196840
196916
197030
197194
197255
197346
197436
197556
197635
19779
197817
197964
198020
198124
198250
198328
198426
198545
198654
198729
198825
202546
202612

Wettest Day of Each Month

Oct: 55.9 mm (2.2 in)
Record daily precipitation for each month at Port Heiden The wettest day on record for each calendar month at Port Heiden. The most was 55.9 mm (2.2 in) on 1 October 1943. 0204060 Jan: 25.9 mm (1.0 in), 9 January 1976 Jan Feb: 21.3 mm (0.8 in), 26 February 1978 Feb Mar: 30.5 mm (1.2 in), 15 March 1981 Mar Apr: 26.2 mm (1.0 in), 17 April 1961 Apr May: 14.7 mm (0.6 in), 16 May 1978 May Jun: 34.5 mm (1.4 in), 6 June 1980 Jun Jul: 40.6 mm (1.6 in), 25 July 1965 Jul Aug: 50.8 mm (2.0 in), 2 August 1966 Aug Sep: 45.7 mm (1.8 in), 21 September 1960 Sep Oct: 55.9 mm (2.2 in), 1 October 1943 Oct Nov: 30.7 mm (1.2 in), 27 November 1983 Nov Dec: 38.1 mm (1.5 in), 28 December 1978 Dec
The wettest day on record for each calendar month at Port Heiden. The most was 55.9 mm (2.2 in) on 1 October 1943.
Record daily precipitation for each month at Port Heiden
MonthRecord daily precipitation (mm)Date
Jan25.9 mm (1.0 in)9 January 1976
Feb21.3 mm (0.8 in)26 February 1978
Mar30.5 mm (1.2 in)15 March 1981
Apr26.2 mm (1.0 in)17 April 1961
May14.7 mm (0.6 in)16 May 1978
Jun34.5 mm (1.4 in)6 June 1980
Jul40.6 mm (1.6 in)25 July 1965
Aug50.8 mm (2.0 in)2 August 1966
Sep45.7 mm (1.8 in)21 September 1960
Oct55.9 mm (2.2 in)1 October 1943
Nov30.7 mm (1.2 in)27 November 1983
Dec38.1 mm (1.5 in)28 December 1978

Period of Record Coverage

1942 to 2026
Days with data per year at Port Heiden 43 years of record at Port Heiden, 1942 to 2026. 19 years have data for under 90 percent of days and are left out of rankings: 1942, 1944, 1947, 1951, 1952, 1957, 1958, 1965 and others. 1942: 120 of 365 days1943: 351 of 365 days1944: 238 of 366 days1947: 106 of 365 days1948: 365 of 366 days1949: 364 of 365 days1950: 365 of 365 days1951: 228 of 365 days1952: 90 of 366 days1957: 211 of 365 days1958: 200 of 365 days1959: 332 of 365 days1960: 358 of 366 days1961: 330 of 365 days1962: 348 of 365 days1963: 359 of 365 days1964: 355 of 366 days1965: 326 of 365 days1966: 177 of 365 days1967: 331 of 365 days1968: 355 of 366 days1969: 238 of 365 days1970: 286 of 365 days1971: 314 of 365 days1972: 333 of 366 days1973: 295 of 365 days1974: 361 of 365 days1975: 363 of 365 days1976: 346 of 366 days1977: 182 of 365 days1978: 347 of 365 days1979: 345 of 365 days1980: 303 of 366 days1981: 364 of 365 days1982: 336 of 365 days1983: 329 of 365 days1984: 268 of 366 days1985: 286 of 365 days1986: 329 of 365 days1987: 356 of 365 days1988: 287 of 366 days2025: 335 of 365 days2026: 218 of 365 days1950196019701980
43 years of record at Port Heiden, 1942 to 2026. 19 years have data for under 90 percent of days and are left out of rankings: 1942, 1944, 1947, 1951, 1952, 1957, 1958, 1965 and others.
Days with data per year at Port Heiden
YearDays with dataShare of yearComplete
194212033%No
194335196%Yes
194423865%No
194710629%No
1948365100%Yes
1949364100%Yes
1950365100%Yes
195122862%No
19529025%No
195721158%No
195820055%No
195933291%Yes
196035898%Yes
196133090%Yes
196234895%Yes
196335998%Yes
196435597%Yes
196532689%No
196617748%No
196733191%Yes
196835597%Yes
196923865%No
197028678%No
197131486%No
197233391%Yes
197329581%No
197436199%Yes
197536399%Yes
197634695%Yes
197718250%No
197834795%Yes
197934595%Yes
198030383%No
1981364100%Yes
198233692%Yes
198332990%Yes
198426873%No
198528678%No
198632990%Yes
198735698%Yes
198828778%No
202533592%Yes
202621860%No

Latest Records

20
Latest records at Port Heiden
DateStationRecordValueBeat old record byOld record stoodSignificance
2 October 2026Port Heiden, USdaily low min (Provisional)-3.9 C (25.0 F)1.1 C (2.0 F)52 years25 of 100 (Routine)
15 September 2026Port Heiden, USdaily high min (Provisional)11.1 C (52.0 F)0.5 C (0.9 F)40 years21 of 100 (Routine)
12 September 2026Port Heiden, USdaily high max (Tie, Provisional)18.3 C (64.9 F)tie68 years7 of 100 (Routine)
12 September 2026Port Heiden, USdaily high min (Tie, Provisional)12.2 C (54.0 F)tie56 years6 of 100 (Routine)
11 September 2026Port Heiden, USdaily high max (Provisional)18.9 C (66.0 F)1.7 C (3.1 F)47 years28 of 100 (Routine)
8 September 2026Port Heiden, USdaily high min (Tie, Provisional)10.0 C (50.0 F)tie76 years7 of 100 (Routine)
4 September 2026Port Heiden, USdaily high min (Provisional)15.0 C (59.0 F)2.8 C (5.0 F)40 years28 of 100 (Routine)
4 September 2026Port Heiden, USdaily high max (Tie, Provisional)20.0 C (68.0 F)tie52 years5 of 100 (Routine)
3 September 2026Port Heiden, USdaily high max (Provisional)21.1 C (70.0 F)2.8 C (5.0 F)56 years34 of 100 (Routine)
2 September 2026Port Heiden, USdaily high min (Tie, Provisional)11.1 C (52.0 F)tie47 years5 of 100 (Routine)
1 September 2026Port Heiden, USdaily rain (Provisional)13.0 mm (0.5 in)0.3 mm (0.01 in)56 years20 of 100 (Routine)
13 August 2026Port Heiden, USdaily high min14.4 C (57.9 F)0.5 C (0.9 F)77 years32 of 100 (Routine)
1 August 2026Port Heiden, USdaily high min13.3 C (55.9 F)0.5 C (0.9 F)63 years27 of 100 (Routine)
22 July 2026Port Heiden, USdaily rain14.0 mm (0.6 in)1.0 mm (0.04 in)76 years20 of 100 (Routine)
13 June 2026Port Heiden, USdaily high max18.9 C (66.0 F)2.8 C (5.0 F)0 years16 of 100 (Routine)
12 June 2026Port Heiden, USdaily high max18.9 C (66.0 F)0.6 C (1.1 F)81 years33 of 100 (Routine)
12 June 2026Port Heiden, USdaily low min-2.2 C (28.0 F)2.2 C (4.0 F)52 years30 of 100 (Routine)
11 June 2026Port Heiden, USdaily low max (Tie)6.1 C (43.0 F)tie75 years7 of 100 (Routine)
30 May 2026Port Heiden, USdaily low min-3.3 C (26.1 F)1.6 C (2.9 F)49 years27 of 100 (Routine)
1 May 2026Port Heiden, USdaily high min (Tie)4.4 C (39.9 F)tie52 years5 of 100 (Routine)

Climate Trend

18 complete years, 1943 to 1987
Annual mean temperature at Port Heiden as warming stripes, 1943 to 1987 One stripe for each of 18 complete years at Port Heiden, 1943 to 1987. Blue stripes are years cooler than the station's own mean of 2.5 C (36.4 F); red stripes are warmer. The coolest year was 1975, at 0.3 C (32.5 F), and the warmest was 1978, at 4.3 C (39.7 F). The strongest colour marks a difference of 2.3 C (4.1 F). 1943: 1.8 C, -0.6 C from the station mean1948: 1.0 C, -1.4 C from the station mean1949: 2.3 C, -0.1 C from the station mean1950: 1.7 C, -0.8 C from the station mean1960: 2.6 C, +0.2 C from the station mean1962: 2.1 C, -0.3 C from the station mean1963: 2.4 C, -0.1 C from the station mean1968: 2.4 C, -0.1 C from the station mean1974: 1.5 C, -1.0 C from the station mean1975: 0.3 C, -2.2 C from the station mean1976: 1.0 C, -1.5 C from the station mean1978: 4.3 C, +1.8 C from the station mean1979: 4.1 C, +1.7 C from the station mean1981: 3.6 C, +1.1 C from the station mean1982: 1.7 C, -0.8 C from the station mean1983: 3.1 C, +0.7 C from the station mean1986: 4.2 C, +1.7 C from the station mean1987: 4.2 C, +1.8 C from the station mean194319501955196019651970197519801985
One stripe for each of 18 complete years at Port Heiden, 1943 to 1987. Blue stripes are years cooler than the station's own mean of 2.5 C (36.4 F); red stripes are warmer. The coolest year was 1975, at 0.3 C (32.5 F), and the warmest was 1978, at 4.3 C (39.7 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Port Heiden as warming stripes, 1943 to 1987
YearAnnual mean temperatureDifference from the station mean
19431.8 C-0.62 C
19481.0 C-1.42 C
19492.3 C-0.13 C
19501.7 C-0.77 C
19602.6 C+0.16 C
19622.1 C-0.32 C
19632.4 C-0.11 C
19682.4 C-0.07 C
19741.5 C-0.95 C
19750.3 C-2.20 C
19761.0 C-1.46 C
19784.3 C+1.84 C
19794.1 C+1.67 C
19813.6 C+1.09 C
19821.7 C-0.77 C
19833.1 C+0.68 C
19864.2 C+1.69 C
19874.2 C+1.77 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

1942 to 2026
Yearly extremes at Port Heiden: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)30.6 C (87.1 F)197123.3 C (73.9 F)43
Coldest night (TNn)-32.2 C (-26.0 F)1971-26.1 C (-15.0 F)43
Wettest day (Rx1day)55.9 mm (2.2 in)194324.2 mm (1.0 in)42
Wettest five days (Rx5day)79.7 mm (3.1 in)196238.2 mm (1.5 in)42
Longest dry spell (CDD)205 days196825 days42

Hottest day (TXx)

Hottest day (TXx) at Port Heiden by year The hottest day of the year at Port Heiden, 1942 to 2026. The record is 30.6 C (87.1 F) in 1971, marked on the chart; the median year is 23.3 C (73.9 F). 0102030401960198020002020Record: 30.6 C (87.1 F) in 1971
The hottest day of the year at Port Heiden, 1942 to 2026. The record is 30.6 C (87.1 F) in 1971, marked on the chart; the median year is 23.3 C (73.9 F).
Hottest day (TXx) at Port Heiden by year
YearHottest day (TXx)
194222.8 C (73.0 F)
194327.8 C (82.0 F)
194426.1 C (79.0 F)
194716.7 C (62.1 F)
194824.4 C (75.9 F)
194920.6 C (69.1 F)
195022.2 C (72.0 F)
195119.4 C (66.9 F)
19529.4 C (48.9 F)
195725.0 C (77.0 F)
195817.2 C (63.0 F)
195926.7 C (80.1 F)
196025.6 C (78.1 F)
196122.2 C (72.0 F)
196226.1 C (79.0 F)
196323.3 C (73.9 F)
196421.1 C (70.0 F)
196520.0 C (68.0 F)
196615.0 C (59.0 F)
196722.8 C (73.0 F)
196825.0 C (77.0 F)
196927.2 C (81.0 F)
197020.0 C (68.0 F)
197130.6 C (87.1 F)
197225.6 C (78.1 F)
197324.4 C (75.9 F)
197423.9 C (75.0 F)
197528.9 C (84.0 F)
197625.0 C (77.0 F)
197720.6 C (69.1 F)
197823.3 C (73.9 F)
197924.4 C (75.9 F)
198023.9 C (75.0 F)
198120.0 C (68.0 F)
198226.1 C (79.0 F)
198320.0 C (68.0 F)
198425.0 C (77.0 F)
198522.8 C (73.0 F)
198624.4 C (75.9 F)
198721.1 C (70.0 F)
198820.6 C (69.1 F)
202522.2 C (72.0 F)
202621.1 C (70.0 F)

Coldest night (TNn)

Coldest night (TNn) at Port Heiden by year The coldest night of the year at Port Heiden, 1942 to 2026. The record is -32.2 C (-26.0 F) in 1971, marked on the chart; the median year is -26.1 C (-15.0 F). -35-30-25-20-15-101960198020002020Record: -32.2 C (-26.0 F) in 1971
The coldest night of the year at Port Heiden, 1942 to 2026. The record is -32.2 C (-26.0 F) in 1971, marked on the chart; the median year is -26.1 C (-15.0 F).
Coldest night (TNn) at Port Heiden by year
YearColdest night (TNn)
1942-29.4 C (-20.9 F)
1943-28.3 C (-18.9 F)
1944-25.0 C (-13.0 F)
1947-23.3 C (-9.9 F)
1948-27.8 C (-18.0 F)
1949-26.7 C (-16.1 F)
1950-25.6 C (-14.1 F)
1951-27.8 C (-18.0 F)
1952-23.9 C (-11.0 F)
1957-13.9 C (7.0 F)
1958-21.1 C (-6.0 F)
1959-23.3 C (-9.9 F)
1960-20.0 C (-4.0 F)
1961-30.0 C (-22.0 F)
1962-27.2 C (-17.0 F)
1963-26.1 C (-15.0 F)
1964-26.7 C (-16.1 F)
1965-31.7 C (-25.1 F)
1966-22.8 C (-9.0 F)
1967-23.3 C (-9.9 F)
1968-27.8 C (-18.0 F)
1969-27.8 C (-18.0 F)
1970-28.3 C (-18.9 F)
1971-32.2 C (-26.0 F)
1972-28.9 C (-20.0 F)
1973-28.3 C (-18.9 F)
1974-30.0 C (-22.0 F)
1975-30.0 C (-22.0 F)
1976-25.6 C (-14.1 F)
1977-23.3 C (-9.9 F)
1978-26.1 C (-15.0 F)
1979-26.1 C (-15.0 F)
1980-28.3 C (-18.9 F)
1981-19.4 C (-2.9 F)
1982-24.4 C (-11.9 F)
1983-26.7 C (-16.1 F)
1984-21.7 C (-7.1 F)
1985-22.8 C (-9.0 F)
1986-22.2 C (-8.0 F)
1987-20.6 C (-5.1 F)
1988-16.1 C (3.0 F)
2025-17.2 C (1.0 F)
2026-23.9 C (-11.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Port Heiden by year The wettest day of the year at Port Heiden, 1942 to 2026. The record is 55.9 mm (2.2 in) in 1943, marked on the chart; the median year is 24.2 mm (1.0 in). 02040601960198020002020Record: 55.9 mm (2.2 in) in 1943
The wettest day of the year at Port Heiden, 1942 to 2026. The record is 55.9 mm (2.2 in) in 1943, marked on the chart; the median year is 24.2 mm (1.0 in).
Wettest day (Rx1day) at Port Heiden by year
YearWettest day (Rx1day)
194233.8 mm (1.3 in)
194355.9 mm (2.2 in)
194417.5 mm (0.7 in)
194717.8 mm (0.7 in)
194819.8 mm (0.8 in)
194920.6 mm (0.8 in)
195014.0 mm (0.6 in)
19519.4 mm (0.37 in)
19522.8 mm (0.11 in)
19572.5 mm (0.10 in)
19583.6 mm (0.14 in)
19593.0 mm (0.12 in)
196045.7 mm (1.8 in)
196126.2 mm (1.0 in)
196227.9 mm (1.1 in)
196317.3 mm (0.7 in)
196417.3 mm (0.7 in)
196540.6 mm (1.6 in)
196650.8 mm (2.0 in)
196723.9 mm (0.9 in)
19683.0 mm (0.12 in)
19692.0 mm (0.08 in)
197031.8 mm (1.3 in)
197121.8 mm (0.9 in)
197219.3 mm (0.8 in)
197324.4 mm (1.0 in)
197426.7 mm (1.1 in)
197530.2 mm (1.2 in)
197625.9 mm (1.0 in)
197729.7 mm (1.2 in)
197838.1 mm (1.5 in)
197927.4 mm (1.1 in)
198034.5 mm (1.4 in)
198130.5 mm (1.2 in)
198226.4 mm (1.0 in)
198330.7 mm (1.2 in)
198413.2 mm (0.5 in)
198530.0 mm (1.2 in)
198646.5 mm (1.8 in)
198720.3 mm (0.8 in)
198816.0 mm (0.6 in)
2025n/a
202614.0 mm (0.6 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Port Heiden by year The wettest five days of the year at Port Heiden, 1942 to 2026. The record is 79.7 mm (3.1 in) in 1962, marked on the chart; the median year is 38.2 mm (1.5 in). 0204060801960198020002020Record: 79.7 mm (3.1 in) in 1962
The wettest five days of the year at Port Heiden, 1942 to 2026. The record is 79.7 mm (3.1 in) in 1962, marked on the chart; the median year is 38.2 mm (1.5 in).
Wettest five days (Rx5day) at Port Heiden by year
YearWettest five days (Rx5day)
194247.1 mm (1.9 in)
194366.8 mm (2.6 in)
194425.9 mm (1.0 in)
194760.1 mm (2.4 in)
194848.3 mm (1.9 in)
194933.0 mm (1.3 in)
195024.7 mm (1.0 in)
195119.1 mm (0.8 in)
19526.3 mm (0.25 in)
19576.1 mm (0.24 in)
19586.0 mm (0.24 in)
19596.5 mm (0.26 in)
196047.0 mm (1.9 in)
196129.5 mm (1.2 in)
196279.7 mm (3.1 in)
196340.2 mm (1.6 in)
196430.8 mm (1.2 in)
196547.4 mm (1.9 in)
196657.2 mm (2.3 in)
196728.5 mm (1.1 in)
19685.8 mm (0.23 in)
19693.3 mm (0.13 in)
197049.9 mm (2.0 in)
197159.2 mm (2.3 in)
197234.0 mm (1.3 in)
197337.1 mm (1.5 in)
197439.3 mm (1.5 in)
197566.1 mm (2.6 in)
197626.5 mm (1.0 in)
197756.4 mm (2.2 in)
197853.1 mm (2.1 in)
197952.5 mm (2.1 in)
198066.7 mm (2.6 in)
198149.3 mm (1.9 in)
198254.1 mm (2.1 in)
198376.7 mm (3.0 in)
198423.1 mm (0.9 in)
198535.9 mm (1.4 in)
198671.9 mm (2.8 in)
198733.0 mm (1.3 in)
198824.9 mm (1.0 in)
2025n/a
202627.2 mm (1.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Port Heiden by year The longest dry spell of the year at Port Heiden, 1942 to 2026. The record is 205 days in 1968, marked on the chart; the median year is 25 days. 01002003001960198020002020Record: 205 days in 1968
The longest dry spell of the year at Port Heiden, 1942 to 2026. The record is 205 days in 1968, marked on the chart; the median year is 25 days.
Longest dry spell (CDD) at Port Heiden by year
YearLongest dry spell (CDD)
194222 days
194317 days
194418 days
194710 days
194842 days
194936 days
195024 days
195126 days
195231 days
195732 days
195825 days
195938 days
196061 days
196129 days
196224 days
196322 days
196448 days
196532 days
196641 days
196726 days
1968205 days
1969137 days
197014 days
197111 days
197217 days
197314 days
197424 days
19758 days
197640 days
197713 days
197815 days
197916 days
198014 days
198128 days
198227 days
198344 days
198424 days
198522 days
198643 days
198725 days
198816 days
2025n/a
20264 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.

Download the Data

  • Data for Port Heiden standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Port Heiden 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 (2026-10-15).