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Hilo 86A Weather Records (USC00511484)

Record envelope, standing records and threshold days for Hilo 86A (USC00511484), Hawaii, United States, with 62 years of record.

Key Facts for Hilo 86A

  • Hilo 86A (USC00511484) is a weather station in Hawaii, United States at 19.73 latitude and -155.08 longitude, 12 m (39 ft) above sea level.
  • The station reports from 1905 to 1966, 62 years of record.
  • 1,464 records set at Hilo 86A still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Hilo 86A set a daily record precipitation of 75.4 mm (3.0 in) on 29 October 1965.

About the Station

  • Location: Hawaii, United States, 19.73 latitude, -155.08 longitude.
  • Elevation: 12 m (39 ft).
  • Period of record: 1905 to 1966, 62 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Hilo 86A, with 2026 drawn through them The band shows the record high and record low for each calendar day at Hilo 86A. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 101520253035 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Hilo 86A. 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 Hilo 86A, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan31.1 C (88.0 F)11.7 C (53.1 F)n/an/a
Feb31.1 C (88.0 F)10.6 C (51.1 F)n/an/a
Mar31.7 C (89.1 F)10.6 C (51.1 F)n/an/a
Apr31.7 C (89.1 F)13.3 C (55.9 F)n/an/a
May32.8 C (91.0 F)15.0 C (59.0 F)n/an/a
Jun31.7 C (89.1 F)15.6 C (60.1 F)n/an/a
Jul32.2 C (90.0 F)15.6 C (60.1 F)n/an/a
Aug33.3 C (91.9 F)15.6 C (60.1 F)n/an/a
Sep32.8 C (91.0 F)15.0 C (59.0 F)n/an/a
Oct33.3 C (91.9 F)15.6 C (60.1 F)n/an/a
Nov32.2 C (90.0 F)12.2 C (54.0 F)n/an/a
Dec31.7 C (89.1 F)11.7 C (53.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Hilo 86A by the year they were set 1,464 records at Hilo 86A still stand. 1905 holds the most, with 96. 02550751001905: 961906: 291907: 541908: 511909: 571910: 461911: 541912: 401913: 391914: 561915: 401916: 741917: 481918: 371919: 91920: 431921: 191922: 191923: 151924: 71925: 141926: 211927: 151928: 101929: 151930: 101931: 71932: 91933: 171934: 201935: 81936: 131937: 351938: 171939: 161940: 311941: 231942: 251943: 91944: 91945: 81946: 21947: 41948: 121949: 101950: 231951: 81952: 101953: 81954: 171955: 111956: 81957: 811958: 541959: 81960: 281961: 151905191119171923192919351941194719531959
1,464 records at Hilo 86A still stand. 1905 holds the most, with 96.
Standing records at Hilo 86A by the year they were set
Year setStanding records
190596
190629
190754
190851
190957
191046
191154
191240
191339
191456
191540
191674
191748
191837
19199
192043
192119
192219
192315
19247
192514
192621
192715
192810
192915
193010
19317
19329
193317
193420
19358
193613
193735
193817
193916
194031
194123
194225
19439
19449
19458
19462
19474
194812
194910
195023
19518
195210
19538
195417
195511
19568
195781
195854
19598
196028
196115

All-Time Record Progression

5 new records
When Hilo 86A set new all-time records 5 all-time records were set at Hilo 86A between 9 April 1938 and 16 September 1957. Each dot is a new record. Record daily precipitationRecord high maximum temperatureRecord high minimum temperature9 April 1938: Record daily precipitation 363.7 mm (14.3 in)3 March 1939: Record daily precipitation 487.7 mm (19.2 in)16 August 1950: Record high maximum temperature 33.3 C (91.9 F)8 September 1957: Record high minimum temperature 26.1 C (79.0 F)16 September 1957: Record high minimum temperature 26.7 C (80.1 F)1940194519501955
5 all-time records were set at Hilo 86A between 9 April 1938 and 16 September 1957. Each dot is a new record.
When Hilo 86A set new all-time records
DateKindDetail
1938-04-09Record daily precipitationRecord daily precipitation 363.7 mm (14.3 in)
1939-03-03Record daily precipitationRecord daily precipitation 487.7 mm (19.2 in)
1950-08-16Record high maximum temperatureRecord high maximum temperature 33.3 C (91.9 F)
1957-09-08Record high minimum temperatureRecord high minimum temperature 26.1 C (79.0 F)
1957-09-16Record high minimum temperatureRecord high minimum temperature 26.7 C (80.1 F)

Wettest Day of Each Month

Mar: 487.7 mm (19.2 in)
Record daily precipitation for each month at Hilo 86A The wettest day on record for each calendar month at Hilo 86A. The most was 487.7 mm (19.2 in) on 3 March 1939. 0200400600 Jan: 343.7 mm (13.5 in), 8 January 1949 Jan Feb: 267.5 mm (10.5 in), 8 February 1950 Feb Mar: 487.7 mm (19.2 in), 3 March 1939 Mar Apr: 363.7 mm (14.3 in), 9 April 1938 Apr May: 231.6 mm (9.1 in), 4 May 1965 May Jun: 188.0 mm (7.4 in), 25 June 1914 Jun Jul: 164.1 mm (6.5 in), 22 July 1931 Jul Aug: 185.4 mm (7.3 in), 20 August 1910 Aug Sep: 195.6 mm (7.7 in), 16 September 1905 Sep Oct: 204.2 mm (8.0 in), 28 October 1951 Oct Nov: 457.2 mm (18.0 in), 2 November 1959 Nov Dec: 315.0 mm (12.4 in), 26 December 1927 Dec
The wettest day on record for each calendar month at Hilo 86A. The most was 487.7 mm (19.2 in) on 3 March 1939.
Record daily precipitation for each month at Hilo 86A
MonthRecord daily precipitation (mm)Date
Jan343.7 mm (13.5 in)8 January 1949
Feb267.5 mm (10.5 in)8 February 1950
Mar487.7 mm (19.2 in)3 March 1939
Apr363.7 mm (14.3 in)9 April 1938
May231.6 mm (9.1 in)4 May 1965
Jun188.0 mm (7.4 in)25 June 1914
Jul164.1 mm (6.5 in)22 July 1931
Aug185.4 mm (7.3 in)20 August 1910
Sep195.6 mm (7.7 in)16 September 1905
Oct204.2 mm (8.0 in)28 October 1951
Nov457.2 mm (18.0 in)2 November 1959
Dec315.0 mm (12.4 in)26 December 1927

Period of Record Coverage

1905 to 1961
Days with data per year at Hilo 86A 57 years of record at Hilo 86A, 1905 to 1961. 8 years have data for under 90 percent of days and are left out of rankings: 1910, 1911, 1912, 1935, 1936, 1949, 1960, 1961. 1905: 349 of 365 days1906: 348 of 365 days1907: 365 of 365 days1908: 349 of 366 days1909: 338 of 365 days1910: 255 of 365 days1911: 321 of 365 days1912: 321 of 366 days1913: 363 of 365 days1914: 338 of 365 days1915: 355 of 365 days1916: 341 of 366 days1917: 345 of 365 days1918: 354 of 365 days1919: 364 of 365 days1920: 349 of 366 days1921: 365 of 365 days1922: 365 of 365 days1923: 365 of 365 days1924: 364 of 366 days1925: 363 of 365 days1926: 364 of 365 days1927: 363 of 365 days1928: 365 of 366 days1929: 363 of 365 days1930: 364 of 365 days1931: 363 of 365 days1932: 366 of 366 days1933: 353 of 365 days1934: 352 of 365 days1935: 246 of 365 days1936: 288 of 366 days1937: 364 of 365 days1938: 365 of 365 days1939: 363 of 365 days1940: 362 of 366 days1941: 354 of 365 days1942: 362 of 365 days1943: 361 of 365 days1944: 366 of 366 days1945: 363 of 365 days1946: 365 of 365 days1947: 362 of 365 days1948: 366 of 366 days1949: 306 of 365 days1950: 341 of 365 days1951: 358 of 365 days1952: 353 of 366 days1953: 351 of 365 days1954: 364 of 365 days1955: 331 of 365 days1956: 334 of 366 days1957: 363 of 365 days1958: 334 of 365 days1959: 365 of 365 days1960: 253 of 366 days1961: 121 of 365 days191019201930194019501960
57 years of record at Hilo 86A, 1905 to 1961. 8 years have data for under 90 percent of days and are left out of rankings: 1910, 1911, 1912, 1935, 1936, 1949, 1960, 1961.
Days with data per year at Hilo 86A
YearDays with dataShare of yearComplete
190534996%Yes
190634895%Yes
1907365100%Yes
190834995%Yes
190933893%Yes
191025570%No
191132188%No
191232188%No
191336399%Yes
191433893%Yes
191535597%Yes
191634193%Yes
191734595%Yes
191835497%Yes
1919364100%Yes
192034995%Yes
1921365100%Yes
1922365100%Yes
1923365100%Yes
192436499%Yes
192536399%Yes
1926364100%Yes
192736399%Yes
1928365100%Yes
192936399%Yes
1930364100%Yes
193136399%Yes
1932366100%Yes
193335397%Yes
193435296%Yes
193524667%No
193628879%No
1937364100%Yes
1938365100%Yes
193936399%Yes
194036299%Yes
194135497%Yes
194236299%Yes
194336199%Yes
1944366100%Yes
194536399%Yes
1946365100%Yes
194736299%Yes
1948366100%Yes
194930684%No
195034193%Yes
195135898%Yes
195235396%Yes
195335196%Yes
1954364100%Yes
195533191%Yes
195633491%Yes
195736399%Yes
195833492%Yes
1959365100%Yes
196025369%No
196112133%No

Latest Records

20
Latest records at Hilo 86A
DateStationRecordValueBeat old record byOld record stoodSignificance
29 October 1965Hilo 86A, USdaily rain75.4 mm (3.0 in)23.1 mm (0.9 in)42 years29 of 100 (Routine)
20 July 1965Hilo 86A, USdaily rain35.6 mm (1.4 in)11.5 mm (0.5 in)8 years16 of 100 (Routine)
5 June 1965Hilo 86A, USdaily rain35.8 mm (1.4 in)3.5 mm (0.14 in)56 years25 of 100 (Routine)
2 June 1965Hilo 86A, USdaily rain46.7 mm (1.8 in)5.3 mm (0.21 in)55 years26 of 100 (Routine)
5 May 1965Hilo 86A, USdaily rain31.0 mm (1.2 in)2.8 mm (0.11 in)12 years10 of 100 (Routine)
4 May 1965Hilo 86A, USmonthly rain231.6 mm (9.1 in)72.3 mm (2.8 in)14 years60 of 100 (Major)
6 April 1965Hilo 86A, USdaily rain120.9 mm (4.8 in)53.6 mm (2.1 in)56 years46 of 100 (Notable)
26 May 1964Hilo 86A, USdaily rain116.3 mm (4.6 in)24.6 mm (1.0 in)23 years29 of 100 (Routine)
18 July 1961Hilo 86A, USdaily rain47.0 mm (1.9 in)5.9 mm (0.23 in)3 years9 of 100 (Routine)
30 June 1961Hilo 86A, USdaily low max22.8 C (73.0 F)1.6 C (2.9 F)50 years32 of 100 (Routine)
27 June 1961Hilo 86A, USdaily low max23.3 C (73.9 F)1.7 C (3.1 F)42 years30 of 100 (Routine)
26 June 1961Hilo 86A, USdaily low max22.8 C (73.0 F)1.6 C (2.9 F)52 years32 of 100 (Routine)
20 June 1961Hilo 86A, USdaily low max23.3 C (73.9 F)1.7 C (3.1 F)47 years32 of 100 (Routine)
19 June 1961Hilo 86A, USdaily low max22.8 C (73.0 F)1.6 C (2.9 F)47 years31 of 100 (Routine)
15 June 1961Hilo 86A, USdaily low min (Tie)17.8 C (64.0 F)tie52 years5 of 100 (Routine)
14 June 1961Hilo 86A, USdaily low max22.8 C (73.0 F)1.6 C (2.9 F)50 years32 of 100 (Routine)
8 June 1961Hilo 86A, USdaily low max (Tie)23.9 C (75.0 F)tie48 years4 of 100 (Routine)
6 June 1961Hilo 86A, USdaily low max (Tie)23.3 C (73.9 F)tie28 years3 of 100 (Routine)
5 June 1961Hilo 86A, USdaily low max (Tie)24.4 C (75.9 F)tie28 years3 of 100 (Routine)
4 May 1961Hilo 86A, USdaily high min (Tie)20.0 C (68.0 F)tie46 years4 of 100 (Routine)

Climate Trend

34 complete years, 1905 to 1959
Annual mean temperature at Hilo 86A as warming stripes, 1905 to 1959 One stripe for each of 34 complete years at Hilo 86A, 1905 to 1959. Blue stripes are years cooler than the station's own mean of 22.8 C (73.0 F); red stripes are warmer. The coolest year was 1916, at 22.0 C (71.5 F), and the warmest was 1940, at 23.5 C (74.2 F). The strongest colour marks a difference of 0.9 C (1.6 F). 1905: 22.7 C, -0.1 C from the station mean1907: 22.6 C, -0.2 C from the station mean1913: 22.0 C, -0.8 C from the station mean1916: 22.0 C, -0.8 C from the station mean1918: 23.1 C, +0.3 C from the station mean1919: 22.7 C, -0.1 C from the station mean1921: 23.0 C, +0.2 C from the station mean1922: 22.7 C, -0.1 C from the station mean1923: 22.8 C, 0.0 C from the station mean1924: 22.6 C, -0.2 C from the station mean1925: 22.8 C, 0.0 C from the station mean1926: 23.3 C, +0.5 C from the station mean1927: 22.9 C, +0.1 C from the station mean1928: 22.5 C, -0.3 C from the station mean1929: 22.7 C, -0.1 C from the station mean1930: 23.0 C, +0.2 C from the station mean1931: 23.1 C, +0.3 C from the station mean1932: 22.9 C, +0.1 C from the station mean1933: 22.3 C, -0.5 C from the station mean1934: 23.3 C, +0.5 C from the station mean1937: 23.3 C, +0.5 C from the station mean1940: 23.5 C, +0.7 C from the station mean1941: 22.9 C, +0.1 C from the station mean1942: 22.9 C, +0.1 C from the station mean1944: 22.7 C, -0.1 C from the station mean1945: 23.3 C, +0.5 C from the station mean1946: 22.8 C, 0.0 C from the station mean1947: 22.8 C, 0.0 C from the station mean1948: 22.7 C, -0.1 C from the station mean1952: 22.3 C, -0.5 C from the station mean1953: 22.5 C, -0.3 C from the station mean1954: 22.9 C, +0.1 C from the station mean1957: 23.2 C, +0.4 C from the station mean1959: 22.7 C, -0.1 C from the station mean19051910191519201925193019351940194519501955
One stripe for each of 34 complete years at Hilo 86A, 1905 to 1959. Blue stripes are years cooler than the station's own mean of 22.8 C (73.0 F); red stripes are warmer. The coolest year was 1916, at 22.0 C (71.5 F), and the warmest was 1940, at 23.5 C (74.2 F). The strongest colour marks a difference of 0.9 C (1.6 F).
Annual mean temperature at Hilo 86A as warming stripes, 1905 to 1959
YearAnnual mean temperatureDifference from the station mean
190522.7 C-0.13 C
190722.6 C-0.16 C
191322.0 C-0.75 C
191622.0 C-0.83 C
191823.1 C+0.27 C
191922.7 C-0.14 C
192123.0 C+0.17 C
192222.7 C-0.08 C
192322.8 C+0.01 C
192422.6 C-0.17 C
192522.8 C-0.04 C
192623.3 C+0.46 C
192722.9 C+0.14 C
192822.5 C-0.33 C
192922.7 C-0.10 C
193023.0 C+0.17 C
193123.1 C+0.30 C
193222.9 C+0.09 C
193322.3 C-0.54 C
193423.3 C+0.49 C
193723.3 C+0.46 C
194023.5 C+0.66 C
194122.9 C+0.09 C
194222.9 C+0.09 C
194422.7 C-0.11 C
194523.3 C+0.48 C
194622.8 C0.00 C
194722.8 C+0.03 C
194822.7 C-0.05 C
195222.3 C-0.53 C
195322.5 C-0.29 C
195422.9 C+0.09 C
195723.2 C+0.37 C
195922.7 C-0.10 C

The fitted trend in annual mean temperature here over 1905 to 1959 is 0.06 C (-0.03 to 0.14) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Hilo 86A
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.06 C (-0.03 to 0.14) per decade0.1 F (-0.1 to 0.3) per decade1905 to 195934Not clearly different from zero
Mean daily maximum0.10 C (-0.03 to 0.23) per decade0.18 F (-0.05 to 0.41) per decade1905 to 195934Not clearly different from zero
Mean daily minimum0.01 C (-0.09 to 0.11) per decade0.02 F (-0.16 to 0.19) per decade1905 to 195934Not 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

1905 to 1966
Yearly extremes at Hilo 86A: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)33.3 C (91.9 F)195031.1 C (88.0 F)57
Coldest night (TNn)10.6 C (51.1 F)190813.9 C (57.0 F)57
Wettest day (Rx1day)487.7 mm (19.2 in)1939173.2 mm (6.8 in)62
Wettest five days (Rx5day)794.1 mm (31.3 in)1939355.3 mm (14.0 in)61
Longest dry spell (CDD)26 days19128 days61

Hottest day (TXx)

Hottest day (TXx) at Hilo 86A by year The hottest day of the year at Hilo 86A, 1905 to 1966. The record is 33.3 C (91.9 F) in 1950, marked on the chart; the median year is 31.1 C (88.0 F). 28303234192019401960Record: 33.3 C (91.9 F) in 1950
The hottest day of the year at Hilo 86A, 1905 to 1966. The record is 33.3 C (91.9 F) in 1950, marked on the chart; the median year is 31.1 C (88.0 F).
Hottest day (TXx) at Hilo 86A by year
YearHottest day (TXx)
190531.7 C (89.1 F)
190632.2 C (90.0 F)
190732.2 C (90.0 F)
190830.6 C (87.1 F)
190930.6 C (87.1 F)
191031.1 C (88.0 F)
191131.7 C (89.1 F)
191231.1 C (88.0 F)
191331.1 C (88.0 F)
191431.1 C (88.0 F)
191530.6 C (87.1 F)
191630.6 C (87.1 F)
191731.7 C (89.1 F)
191832.8 C (91.0 F)
191931.1 C (88.0 F)
192031.7 C (89.1 F)
192130.6 C (87.1 F)
192230.6 C (87.1 F)
192330.0 C (86.0 F)
192430.0 C (86.0 F)
192530.0 C (86.0 F)
192630.0 C (86.0 F)
192730.6 C (87.1 F)
192828.9 C (84.0 F)
192930.0 C (86.0 F)
193031.1 C (88.0 F)
193130.0 C (86.0 F)
193232.2 C (90.0 F)
193329.4 C (84.9 F)
193432.2 C (90.0 F)
193531.1 C (88.0 F)
193632.2 C (90.0 F)
193732.2 C (90.0 F)
193831.1 C (88.0 F)
193932.8 C (91.0 F)
194032.2 C (90.0 F)
194132.8 C (91.0 F)
194231.7 C (89.1 F)
194331.1 C (88.0 F)
194431.7 C (89.1 F)
194531.1 C (88.0 F)
194630.0 C (86.0 F)
194730.0 C (86.0 F)
194831.7 C (89.1 F)
194930.0 C (86.0 F)
195033.3 C (91.9 F)
195132.8 C (91.0 F)
195232.2 C (90.0 F)
195330.0 C (86.0 F)
195431.1 C (88.0 F)
195530.6 C (87.1 F)
195631.1 C (88.0 F)
195731.1 C (88.0 F)
195831.7 C (89.1 F)
195932.2 C (90.0 F)
196032.8 C (91.0 F)
196131.7 C (89.1 F)
1962n/a
1963n/a
1964n/a
1965n/a
1966n/a

Coldest night (TNn)

Coldest night (TNn) at Hilo 86A by year The coldest night of the year at Hilo 86A, 1905 to 1966. The record is 10.6 C (51.1 F) in 1908, marked on the chart; the median year is 13.9 C (57.0 F). 1012141618192019401960Record: 10.6 C (51.1 F) in 1908
The coldest night of the year at Hilo 86A, 1905 to 1966. The record is 10.6 C (51.1 F) in 1908, marked on the chart; the median year is 13.9 C (57.0 F).
Coldest night (TNn) at Hilo 86A by year
YearColdest night (TNn)
190513.3 C (55.9 F)
190613.3 C (55.9 F)
190713.3 C (55.9 F)
190810.6 C (51.1 F)
190911.7 C (53.1 F)
191013.3 C (55.9 F)
191112.2 C (54.0 F)
191214.4 C (57.9 F)
191313.9 C (57.0 F)
191413.3 C (55.9 F)
191512.2 C (54.0 F)
191614.4 C (57.9 F)
191710.6 C (51.1 F)
191815.6 C (60.1 F)
191911.7 C (53.1 F)
192014.4 C (57.9 F)
192115.0 C (59.0 F)
192213.3 C (55.9 F)
192311.1 C (52.0 F)
192414.4 C (57.9 F)
192514.4 C (57.9 F)
192614.4 C (57.9 F)
192714.4 C (57.9 F)
192814.4 C (57.9 F)
192914.4 C (57.9 F)
193013.3 C (55.9 F)
193114.4 C (57.9 F)
193214.4 C (57.9 F)
193313.3 C (55.9 F)
193414.4 C (57.9 F)
193514.4 C (57.9 F)
193614.4 C (57.9 F)
193712.8 C (55.0 F)
193815.6 C (60.1 F)
193916.1 C (61.0 F)
194013.3 C (55.9 F)
194115.6 C (60.1 F)
194212.2 C (54.0 F)
194312.2 C (54.0 F)
194413.3 C (55.9 F)
194515.6 C (60.1 F)
194615.6 C (60.1 F)
194714.4 C (57.9 F)
194812.8 C (55.0 F)
194913.9 C (57.0 F)
195015.6 C (60.1 F)
195112.8 C (55.0 F)
195215.0 C (59.0 F)
195313.9 C (57.0 F)
195413.9 C (57.0 F)
195515.0 C (59.0 F)
195614.4 C (57.9 F)
195714.4 C (57.9 F)
195813.9 C (57.0 F)
195914.4 C (57.9 F)
196012.8 C (55.0 F)
196113.3 C (55.9 F)
1962n/a
1963n/a
1964n/a
1965n/a
1966n/a

Wettest day (Rx1day)

Wettest day (Rx1day) at Hilo 86A by year The wettest day of the year at Hilo 86A, 1905 to 1966. The record is 487.7 mm (19.2 in) in 1939, marked on the chart; the median year is 173.2 mm (6.8 in). 0200400600192019401960Record: 487.7 mm (19.2 in) in 1939
The wettest day of the year at Hilo 86A, 1905 to 1966. The record is 487.7 mm (19.2 in) in 1939, marked on the chart; the median year is 173.2 mm (6.8 in).
Wettest day (Rx1day) at Hilo 86A by year
YearWettest day (Rx1day)
1905195.6 mm (7.7 in)
1906160.0 mm (6.3 in)
1907167.6 mm (6.6 in)
1908112.0 mm (4.4 in)
190978.7 mm (3.1 in)
1910185.4 mm (7.3 in)
1911109.5 mm (4.3 in)
191277.0 mm (3.0 in)
1913177.8 mm (7.0 in)
1914188.0 mm (7.4 in)
1915177.5 mm (7.0 in)
1916142.2 mm (5.6 in)
191757.2 mm (2.3 in)
1918207.8 mm (8.2 in)
1919168.4 mm (6.6 in)
1920172.2 mm (6.8 in)
1921338.6 mm (13.3 in)
1922292.6 mm (11.5 in)
1923209.6 mm (8.3 in)
1924317.0 mm (12.5 in)
192589.4 mm (3.5 in)
192675.7 mm (3.0 in)
1927315.0 mm (12.4 in)
1928118.4 mm (4.7 in)
1929146.3 mm (5.8 in)
1930131.6 mm (5.2 in)
1931178.8 mm (7.0 in)
1932158.5 mm (6.2 in)
1933128.5 mm (5.1 in)
1934147.8 mm (5.8 in)
1935174.2 mm (6.9 in)
1936208.8 mm (8.2 in)
1937211.1 mm (8.3 in)
1938363.7 mm (14.3 in)
1939487.7 mm (19.2 in)
1940170.7 mm (6.7 in)
1941129.0 mm (5.1 in)
1942401.3 mm (15.8 in)
1943134.6 mm (5.3 in)
1944190.5 mm (7.5 in)
1945221.2 mm (8.7 in)
1946270.0 mm (10.6 in)
1947212.6 mm (8.4 in)
1948192.5 mm (7.6 in)
1949343.7 mm (13.5 in)
1950267.5 mm (10.5 in)
1951204.2 mm (8.0 in)
1952155.4 mm (6.1 in)
1953226.1 mm (8.9 in)
1954219.7 mm (8.6 in)
1955104.1 mm (4.1 in)
1956208.3 mm (8.2 in)
1957154.7 mm (6.1 in)
1958129.8 mm (5.1 in)
1959457.2 mm (18.0 in)
1960153.7 mm (6.1 in)
196196.3 mm (3.8 in)
19629.9 mm (0.39 in)
1963100.8 mm (4.0 in)
1964116.3 mm (4.6 in)
1965231.6 mm (9.1 in)
196667.6 mm (2.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Hilo 86A by year The wettest five days of the year at Hilo 86A, 1905 to 1966. The record is 794.1 mm (31.3 in) in 1939, marked on the chart; the median year is 355.3 mm (14.0 in). 0200400600800192019401960Record: 794.1 mm (31.3 in) in 1939
The wettest five days of the year at Hilo 86A, 1905 to 1966. The record is 794.1 mm (31.3 in) in 1939, marked on the chart; the median year is 355.3 mm (14.0 in).
Wettest five days (Rx5day) at Hilo 86A by year
YearWettest five days (Rx5day)
1905307.7 mm (12.1 in)
1906258.5 mm (10.2 in)
1907369.3 mm (14.5 in)
1908400.1 mm (15.8 in)
1909221.4 mm (8.7 in)
1910280.6 mm (11.0 in)
1911288.6 mm (11.4 in)
1912152.4 mm (6.0 in)
1913355.3 mm (14.0 in)
1914342.1 mm (13.5 in)
1915406.9 mm (16.0 in)
1916416.6 mm (16.4 in)
1917151.9 mm (6.0 in)
1918538.5 mm (21.2 in)
1919291.1 mm (11.5 in)
1920372.6 mm (14.7 in)
1921561.6 mm (22.1 in)
1922770.4 mm (30.3 in)
1923371.3 mm (14.6 in)
1924483.6 mm (19.0 in)
1925244.3 mm (9.6 in)
1926168.1 mm (6.6 in)
1927605.5 mm (23.8 in)
1928315.0 mm (12.4 in)
1929290.1 mm (11.4 in)
1930281.7 mm (11.1 in)
1931230.3 mm (9.1 in)
1932430.2 mm (16.9 in)
1933253.4 mm (10.0 in)
1934215.7 mm (8.5 in)
1935457.4 mm (18.0 in)
1936529.1 mm (20.8 in)
1937566.4 mm (22.3 in)
1938735.8 mm (29.0 in)
1939794.1 mm (31.3 in)
1940263.4 mm (10.4 in)
1941263.8 mm (10.4 in)
1942683.3 mm (26.9 in)
1943211.9 mm (8.3 in)
1944358.1 mm (14.1 in)
1945415.8 mm (16.4 in)
1946453.5 mm (17.9 in)
1947383.7 mm (15.1 in)
1948374.0 mm (14.7 in)
1949498.7 mm (19.6 in)
1950463.0 mm (18.2 in)
1951432.1 mm (17.0 in)
1952350.2 mm (13.8 in)
1953335.1 mm (13.2 in)
1954668.5 mm (26.3 in)
1955203.0 mm (8.0 in)
1956485.7 mm (19.1 in)
1957340.3 mm (13.4 in)
1958225.0 mm (8.9 in)
1959610.6 mm (24.0 in)
1960457.4 mm (18.0 in)
196144.2 mm (1.7 in)
19620.0 mm (0.00 in)
1963100.8 mm (4.0 in)
1964n/a
1965119.3 mm (4.7 in)
196680.8 mm (3.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Hilo 86A by year The longest dry spell of the year at Hilo 86A, 1905 to 1966. The record is 26 days in 1912, marked on the chart; the median year is 8 days. 0102030192019401960Record: 26 days in 1912
The longest dry spell of the year at Hilo 86A, 1905 to 1966. The record is 26 days in 1912, marked on the chart; the median year is 8 days.
Longest dry spell (CDD) at Hilo 86A by year
YearLongest dry spell (CDD)
190520 days
190617 days
19078 days
19089 days
19099 days
191011 days
19114 days
191226 days
19137 days
19149 days
191521 days
19168 days
191716 days
191810 days
191918 days
19208 days
192114 days
192212 days
192310 days
19244 days
19251 day
19263 days
19272 days
19286 days
19293 days
19303 days
19313 days
19322 days
19332 days
19342 days
19352 days
19362 days
19373 days
19385 days
19397 days
194015 days
19415 days
194211 days
194317 days
19449 days
194518 days
19467 days
19478 days
19485 days
19498 days
195011 days
195112 days
19527 days
195318 days
195417 days
19556 days
19566 days
195712 days
195810 days
19597 days
196021 days
196117 days
19627 days
19636 days
1964n/a
196510 days
19668 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

35 years, 1905 to 1959

A day with at least 184.2 mm (7.3 in) of rain is expected about once in 2 years. A day with at least 542.5 mm (21.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Hilo 86A: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years184.2 mm (7.3 in)
5 years266.3 mm (10.5 in)
10 years325.8 mm (12.8 in)
25 years407.4 mm (16.0 in)
50 years472.9 mm (18.6 in)Longer than the 35 years of record
100 years542.5 mm (21.4 in)Longer than the 35 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, 35 years of values from 1905 to 1959.

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: 487.7 mm (19.2 in) in 1939; 457.2 mm (18.0 in) in 1959; 401.3 mm (15.8 in) in 1942.

Download the Data

  • Data for Hilo 86A standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Hilo 86A 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 (2025-12-31).