Daily records
Page built 2026-10-15
Data as of 2025-12-31
Search
Built 2026-10-15 (15 October 2026)

Sulphur Platt Nat'l Pk Weather Records (USC00348587)

Record envelope, standing records and threshold days for Sulphur Platt Nat'l Pk (USC00348587), Oklahoma, United States, with 62 years of record.

Key Facts for Sulphur Platt Nat'l Pk

  • Sulphur Platt Nat'l Pk (USC00348587) is a weather station in Oklahoma, United States at 34.50 latitude and -96.97 longitude, 302 m (991 ft) above sea level.
  • The station reports from 1917 to 1978, 62 years of record.
  • 1,464 records set at Sulphur Platt Nat'l Pk still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Sulphur Platt Nat'l Pk tied a daily record high maximum temperature of 32.2 C (90.0 F) on 20 October 1978.

About the Station

  • Location: Oklahoma, United States, 34.50 latitude, -96.97 longitude.
  • Elevation: 302 m (991 ft).
  • Period of record: 1917 to 1978, 62 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 Sulphur Platt Nat'l Pk, with 2026 drawn through them The band shows the record high and record low for each calendar day at Sulphur Platt Nat'l Pk. The lines show the 2026 daily maximum and minimum. 0 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 Sulphur Platt Nat'l Pk. 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 Sulphur Platt Nat'l Pk, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan29.4 C (84.9 F)-26.1 C (-15.0 F)n/an/a
Feb31.7 C (89.1 F)-20.0 C (-4.0 F)n/an/a
Mar35.6 C (96.1 F)-17.2 C (1.0 F)n/an/a
Apr37.8 C (100.0 F)-5.6 C (21.9 F)n/an/a
May39.4 C (102.9 F)0.6 C (33.1 F)n/an/a
Jun42.2 C (108.0 F)6.1 C (43.0 F)n/an/a
Jul43.9 C (111.0 F)10.0 C (50.0 F)n/an/a
Aug45.6 C (114.1 F)8.9 C (48.0 F)n/an/a
Sep42.2 C (108.0 F)-0.6 C (30.9 F)n/an/a
Oct37.2 C (99.0 F)-5.6 C (21.9 F)n/an/a
Nov31.7 C (89.1 F)-13.9 C (7.0 F)n/an/a
Dec30.6 C (87.1 F)-18.3 C (-0.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Sulphur Platt Nat'l Pk by the year they were set 1,464 records at Sulphur Platt Nat'l Pk still stand. 1925 holds the most, with 58. 02040601917: 251918: 251919: 211920: 231921: 231922: 291923: 241924: 471925: 581926: 191927: 351928: 261929: 231930: 151931: 251932: 221933: 251934: 281935: 211936: 391937: 211938: 151939: 411940: 191941: 131942: 131943: 291944: 131945: 191946: 131947: 271948: 281949: 101950: 311951: 321952: 331953: 281954: 381955: 301956: 321957: 151958: 211959: 161960: 151961: 181962: 201963: 261964: 191965: 251966: 281967: 291968: 211969: 91970: 191971: 171972: 191973: 131974: 231975: 201976: 281977: 111978: 14191719241931193819451952195919661973
1,464 records at Sulphur Platt Nat'l Pk still stand. 1925 holds the most, with 58.
Standing records at Sulphur Platt Nat'l Pk by the year they were set
Year setStanding records
191725
191825
191921
192023
192123
192229
192324
192447
192558
192619
192735
192826
192923
193015
193125
193222
193325
193428
193521
193639
193721
193815
193941
194019
194113
194213
194329
194413
194519
194613
194727
194828
194910
195031
195132
195233
195328
195438
195530
195632
195715
195821
195916
196015
196118
196220
196326
196419
196525
196628
196729
196821
19699
197019
197117
197219
197313
197423
197520
197628
197711
197814

All-Time Record Progression

1 new records
When Sulphur Platt Nat'l Pk set new all-time records 1 all-time records were set at Sulphur Platt Nat'l Pk between 8 October 1970 and 8 October 1970. Each dot is a new record. Record daily precipitation8 October 1970: Record daily precipitation 294.9 mm (11.6 in)1970
1 all-time records were set at Sulphur Platt Nat'l Pk between 8 October 1970 and 8 October 1970. Each dot is a new record.
When Sulphur Platt Nat'l Pk set new all-time records
DateKindDetail
1970-10-08Record daily precipitationRecord daily precipitation 294.9 mm (11.6 in)

Wettest Day of Each Month

Oct: 294.9 mm (11.6 in)
Record daily precipitation for each month at Sulphur Platt Nat'l Pk The wettest day on record for each calendar month at Sulphur Platt Nat'l Pk. The most was 294.9 mm (11.6 in) on 8 October 1970. 0100200300 Jan: 71.1 mm (2.8 in), 17 January 1928 Jan Feb: 123.2 mm (4.9 in), 16 February 1938 Feb Mar: 99.6 mm (3.9 in), 27 March 1977 Mar Apr: 120.4 mm (4.7 in), 25 April 1924 Apr May: 165.1 mm (6.5 in), 13 May 1933 May Jun: 124.5 mm (4.9 in), 21 June 1928 Jun Jul: 102.6 mm (4.0 in), 20 July 1953 Jul Aug: 109.7 mm (4.3 in), 17 August 1926 Aug Sep: 160.5 mm (6.3 in), 23 September 1970 Sep Oct: 294.9 mm (11.6 in), 8 October 1970 Oct Nov: 78.7 mm (3.1 in), 23 November 1931 Nov Dec: 186.7 mm (7.4 in), 23 December 1932 Dec
The wettest day on record for each calendar month at Sulphur Platt Nat'l Pk. The most was 294.9 mm (11.6 in) on 8 October 1970.
Record daily precipitation for each month at Sulphur Platt Nat'l Pk
MonthRecord daily precipitation (mm)Date
Jan71.1 mm (2.8 in)17 January 1928
Feb123.2 mm (4.9 in)16 February 1938
Mar99.6 mm (3.9 in)27 March 1977
Apr120.4 mm (4.7 in)25 April 1924
May165.1 mm (6.5 in)13 May 1933
Jun124.5 mm (4.9 in)21 June 1928
Jul102.6 mm (4.0 in)20 July 1953
Aug109.7 mm (4.3 in)17 August 1926
Sep160.5 mm (6.3 in)23 September 1970
Oct294.9 mm (11.6 in)8 October 1970
Nov78.7 mm (3.1 in)23 November 1931
Dec186.7 mm (7.4 in)23 December 1932

Period of Record Coverage

1917 to 1978
Days with data per year at Sulphur Platt Nat'l Pk 62 years of record at Sulphur Platt Nat'l Pk, 1917 to 1978. 3 years have data for under 90 percent of days and are left out of rankings: 1917, 1918, 1978. 1917: 296 of 365 days1918: 186 of 365 days1919: 346 of 365 days1920: 362 of 366 days1921: 362 of 365 days1922: 364 of 365 days1923: 363 of 365 days1924: 360 of 366 days1925: 362 of 365 days1926: 359 of 365 days1927: 361 of 365 days1928: 362 of 366 days1929: 362 of 365 days1930: 332 of 365 days1931: 362 of 365 days1932: 365 of 366 days1933: 359 of 365 days1934: 329 of 365 days1935: 355 of 365 days1936: 364 of 366 days1937: 363 of 365 days1938: 364 of 365 days1939: 363 of 365 days1940: 364 of 366 days1941: 363 of 365 days1942: 362 of 365 days1943: 362 of 365 days1944: 364 of 366 days1945: 360 of 365 days1946: 362 of 365 days1947: 351 of 365 days1948: 365 of 366 days1949: 363 of 365 days1950: 364 of 365 days1951: 363 of 365 days1952: 360 of 366 days1953: 361 of 365 days1954: 361 of 365 days1955: 364 of 365 days1956: 366 of 366 days1957: 365 of 365 days1958: 365 of 365 days1959: 365 of 365 days1960: 363 of 366 days1961: 364 of 365 days1962: 360 of 365 days1963: 365 of 365 days1964: 365 of 366 days1965: 365 of 365 days1966: 364 of 365 days1967: 365 of 365 days1968: 366 of 366 days1969: 365 of 365 days1970: 363 of 365 days1971: 365 of 365 days1972: 366 of 366 days1973: 364 of 365 days1974: 363 of 365 days1975: 361 of 365 days1976: 365 of 366 days1977: 361 of 365 days1978: 301 of 365 days192019301940195019601970
62 years of record at Sulphur Platt Nat'l Pk, 1917 to 1978. 3 years have data for under 90 percent of days and are left out of rankings: 1917, 1918, 1978.
Days with data per year at Sulphur Platt Nat'l Pk
YearDays with dataShare of yearComplete
191729681%No
191818651%No
191934695%Yes
192036299%Yes
192136299%Yes
1922364100%Yes
192336399%Yes
192436098%Yes
192536299%Yes
192635998%Yes
192736199%Yes
192836299%Yes
192936299%Yes
193033291%Yes
193136299%Yes
1932365100%Yes
193335998%Yes
193432990%Yes
193535597%Yes
193636499%Yes
193736399%Yes
1938364100%Yes
193936399%Yes
194036499%Yes
194136399%Yes
194236299%Yes
194336299%Yes
194436499%Yes
194536099%Yes
194636299%Yes
194735196%Yes
1948365100%Yes
194936399%Yes
1950364100%Yes
195136399%Yes
195236098%Yes
195336199%Yes
195436199%Yes
1955364100%Yes
1956366100%Yes
1957365100%Yes
1958365100%Yes
1959365100%Yes
196036399%Yes
1961364100%Yes
196236099%Yes
1963365100%Yes
1964365100%Yes
1965365100%Yes
1966364100%Yes
1967365100%Yes
1968366100%Yes
1969365100%Yes
197036399%Yes
1971365100%Yes
1972366100%Yes
1973364100%Yes
197436399%Yes
197536199%Yes
1976365100%Yes
197736199%Yes
197830182%No

Latest Records

20
Latest records at Sulphur Platt Nat'l Pk
DateStationRecordValueBeat old record byOld record stoodSignificance
20 October 1978Sulphur Platt Nat'l Pk, USdaily high max (Tie)32.2 C (90.0 F)tie31 years3 of 100 (Routine)
15 October 1978Sulphur Platt Nat'l Pk, USdaily low min0.0 C (32.0 F)1.1 C (2.0 F)24 years14 of 100 (Routine)
14 October 1978Sulphur Platt Nat'l Pk, USdaily low min-1.1 C (30.0 F)2.8 C (5.0 F)8 years12 of 100 (Routine)
12 October 1978Sulphur Platt Nat'l Pk, USdaily high max (Tie)33.9 C (93.0 F)tie15 years2 of 100 (Routine)
13 September 1978Sulphur Platt Nat'l Pk, USdaily high min24.4 C (75.9 F)0.5 C (0.9 F)57 years24 of 100 (Routine)
10 September 1978Sulphur Platt Nat'l Pk, USdaily rain42.4 mm (1.7 in)32.0 mm (1.3 in)48 years35 of 100 (Notable)
15 August 1978Sulphur Platt Nat'l Pk, USdaily high min26.1 C (79.0 F)0.5 C (0.9 F)48 years21 of 100 (Routine)
6 August 1978Sulphur Platt Nat'l Pk, USdaily low min (Tie)16.1 C (61.0 F)tie3 years1 of 100 (Routine)
5 August 1978Sulphur Platt Nat'l Pk, USdaily low max28.9 C (84.0 F)0.5 C (0.9 F)29 years15 of 100 (Routine)
4 August 1978Sulphur Platt Nat'l Pk, USdaily low max25.6 C (78.1 F)3.8 C (6.8 F)28 years24 of 100 (Routine)
14 July 1978Sulphur Platt Nat'l Pk, USdaily high max (Tie)40.6 C (105.1 F)tie52 years5 of 100 (Routine)
9 June 1978Sulphur Platt Nat'l Pk, USdaily low min10.0 C (50.0 F)3.9 C (7.0 F)23 years23 of 100 (Routine)
8 June 1978Sulphur Platt Nat'l Pk, USdaily low max25.6 C (78.1 F)1.1 C (2.0 F)40 years21 of 100 (Routine)
5 June 1978Sulphur Platt Nat'l Pk, USdaily rain22.1 mm (0.9 in)1.0 mm (0.04 in)51 years20 of 100 (Routine)
28 May 1978Sulphur Platt Nat'l Pk, USdaily rain51.6 mm (2.0 in)8.4 mm (0.33 in)27 years18 of 100 (Routine)
15 May 1978Sulphur Platt Nat'l Pk, USdaily high max34.4 C (93.9 F)2.2 C (4.0 F)25 years18 of 100 (Routine)
14 May 1978Sulphur Platt Nat'l Pk, USdaily high max32.2 C (90.0 F)0.5 C (0.9 F)47 years21 of 100 (Routine)
3 May 1978Sulphur Platt Nat'l Pk, USdaily low max12.8 C (55.0 F)1.1 C (2.0 F)24 years15 of 100 (Routine)
3 May 1978Sulphur Platt Nat'l Pk, USdaily rain43.4 mm (1.7 in)3.3 mm (0.13 in)3 years7 of 100 (Routine)
24 March 1978Sulphur Platt Nat'l Pk, USdaily rain31.0 mm (1.2 in)4.3 mm (0.17 in)4 years10 of 100 (Routine)

Climate Trend

55 complete years, 1920 to 1977
Annual mean temperature at Sulphur Platt Nat'l Pk as warming stripes, 1920 to 1977 One stripe for each of 55 complete years at Sulphur Platt Nat'l Pk, 1920 to 1977. Blue stripes are years cooler than the station's own mean of 17.1 C (62.7 F); red stripes are warmer. The coolest year was 1968, at 15.9 C (60.7 F), and the warmest was 1939, at 18.4 C (65.1 F). The strongest colour marks a difference of 1.4 C (2.5 F). 1920: 16.6 C, -0.5 C from the station mean1921: 18.2 C, +1.2 C from the station mean1922: 17.8 C, +0.8 C from the station mean1924: 16.7 C, -0.4 C from the station mean1925: 18.4 C, +1.3 C from the station mean1926: 16.9 C, -0.1 C from the station mean1927: 17.9 C, +0.8 C from the station mean1928: 17.1 C, +0.1 C from the station mean1929: 16.5 C, -0.6 C from the station mean1931: 17.7 C, +0.7 C from the station mean1932: 17.0 C, 0.0 C from the station mean1933: 18.2 C, +1.1 C from the station mean1935: 16.9 C, -0.2 C from the station mean1936: 17.4 C, +0.3 C from the station mean1937: 16.7 C, -0.4 C from the station mean1938: 18.1 C, +1.0 C from the station mean1939: 18.4 C, +1.3 C from the station mean1940: 16.1 C, -1.0 C from the station mean1941: 17.3 C, +0.2 C from the station mean1942: 16.8 C, -0.3 C from the station mean1943: 17.5 C, +0.4 C from the station mean1944: 17.3 C, +0.3 C from the station mean1945: 16.7 C, -0.4 C from the station mean1946: 18.1 C, +1.0 C from the station mean1947: 17.0 C, -0.1 C from the station mean1948: 16.3 C, -0.7 C from the station mean1949: 16.0 C, -1.1 C from the station mean1950: 16.4 C, -0.7 C from the station mean1951: 16.8 C, -0.2 C from the station mean1952: 17.7 C, +0.6 C from the station mean1953: 17.6 C, +0.5 C from the station mean1954: 18.4 C, +1.3 C from the station mean1955: 17.4 C, +0.3 C from the station mean1956: 18.2 C, +1.1 C from the station mean1957: 16.8 C, -0.3 C from the station mean1958: 16.7 C, -0.4 C from the station mean1959: 16.7 C, -0.4 C from the station mean1960: 16.4 C, -0.7 C from the station mean1961: 16.1 C, -0.9 C from the station mean1962: 16.8 C, -0.2 C from the station mean1963: 17.2 C, +0.2 C from the station mean1964: 17.0 C, 0.0 C from the station mean1965: 17.3 C, +0.2 C from the station mean1966: 16.3 C, -0.8 C from the station mean1967: 17.0 C, -0.1 C from the station mean1968: 15.9 C, -1.1 C from the station mean1969: 16.7 C, -0.4 C from the station mean1970: 16.7 C, -0.4 C from the station mean1971: 16.8 C, -0.3 C from the station mean1972: 16.8 C, -0.3 C from the station mean1973: 16.6 C, -0.5 C from the station mean1974: 16.9 C, -0.1 C from the station mean1975: 16.4 C, -0.7 C from the station mean1976: 16.4 C, -0.7 C from the station mean1977: 17.5 C, +0.4 C from the station mean192019251930193519401945195019551960196519701975
One stripe for each of 55 complete years at Sulphur Platt Nat'l Pk, 1920 to 1977. Blue stripes are years cooler than the station's own mean of 17.1 C (62.7 F); red stripes are warmer. The coolest year was 1968, at 15.9 C (60.7 F), and the warmest was 1939, at 18.4 C (65.1 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Sulphur Platt Nat'l Pk as warming stripes, 1920 to 1977
YearAnnual mean temperatureDifference from the station mean
192016.6 C-0.52 C
192118.2 C+1.17 C
192217.8 C+0.75 C
192416.7 C-0.39 C
192518.4 C+1.31 C
192616.9 C-0.13 C
192717.9 C+0.81 C
192817.1 C+0.05 C
192916.5 C-0.61 C
193117.7 C+0.66 C
193217.0 C-0.04 C
193318.2 C+1.09 C
193516.9 C-0.19 C
193617.4 C+0.29 C
193716.7 C-0.41 C
193818.1 C+1.00 C
193918.4 C+1.34 C
194016.1 C-0.99 C
194117.3 C+0.18 C
194216.8 C-0.28 C
194317.5 C+0.41 C
194417.3 C+0.27 C
194516.7 C-0.41 C
194618.1 C+1.01 C
194717.0 C-0.06 C
194816.3 C-0.75 C
194916.0 C-1.08 C
195016.4 C-0.70 C
195116.8 C-0.23 C
195217.7 C+0.58 C
195317.6 C+0.50 C
195418.4 C+1.31 C
195517.4 C+0.32 C
195618.2 C+1.13 C
195716.8 C-0.31 C
195816.7 C-0.41 C
195916.7 C-0.36 C
196016.4 C-0.70 C
196116.1 C-0.94 C
196216.8 C-0.24 C
196317.2 C+0.16 C
196417.0 C-0.05 C
196517.3 C+0.22 C
196616.3 C-0.81 C
196717.0 C-0.07 C
196815.9 C-1.15 C
196916.7 C-0.38 C
197016.7 C-0.40 C
197116.8 C-0.31 C
197216.8 C-0.29 C
197316.6 C-0.51 C
197416.9 C-0.13 C
197516.4 C-0.70 C
197616.4 C-0.72 C
197717.5 C+0.44 C

The annual mean temperature here has fallen by 0.15 C (0.05 to 0.25) per decade over 1920 to 1977. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 55 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Sulphur Platt Nat'l Pk
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.15 C (-0.25 to -0.05) per decade-0.3 F (-0.5 to -0.1) per decade1920 to 197755Fall
Mean daily maximum-0.12 C (-0.26 to 0.02) per decade-0.22 F (-0.47 to 0.04) per decade1920 to 197755Not clearly different from zero
Mean daily minimum-0.2 C (-0.3 to -0.1) per decade-0.3 F (-0.5 to -0.2) per decade1920 to 197755Fall

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

1917 to 1978
Yearly extremes at Sulphur Platt Nat'l Pk: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)45.6 C (114.1 F)193641.1 C (106.0 F)62
Coldest night (TNn)-26.1 C (-15.0 F)1930-15.6 C (3.9 F)62
Wettest day (Rx1day)294.9 mm (11.6 in)197077.7 mm (3.1 in)62
Wettest five days (Rx5day)346.5 mm (13.6 in)1970120.4 mm (4.7 in)62
Longest dry spell (CDD)70 days193432 days62

Hottest day (TXx)

Hottest day (TXx) at Sulphur Platt Nat'l Pk by year The hottest day of the year at Sulphur Platt Nat'l Pk, 1917 to 1978. The record is 45.6 C (114.1 F) in 1936, marked on the chart; the median year is 41.1 C (106.0 F). 3537.54042.54547.5192019401960Record: 45.6 C (114.1 F) in 1936
The hottest day of the year at Sulphur Platt Nat'l Pk, 1917 to 1978. The record is 45.6 C (114.1 F) in 1936, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Sulphur Platt Nat'l Pk by year
YearHottest day (TXx)
191740.6 C (105.1 F)
191841.1 C (106.0 F)
191939.4 C (102.9 F)
192037.8 C (100.0 F)
192138.9 C (102.0 F)
192241.7 C (107.1 F)
192342.8 C (109.0 F)
192442.8 C (109.0 F)
192542.8 C (109.0 F)
192639.4 C (102.9 F)
192739.4 C (102.9 F)
192838.3 C (100.9 F)
192942.2 C (108.0 F)
193041.1 C (106.0 F)
193140.6 C (105.1 F)
193241.1 C (106.0 F)
193342.8 C (109.0 F)
193442.2 C (108.0 F)
193541.1 C (106.0 F)
193645.6 C (114.1 F)
193742.8 C (109.0 F)
193838.9 C (102.0 F)
193943.3 C (109.9 F)
194037.2 C (99.0 F)
194139.4 C (102.9 F)
194237.8 C (100.0 F)
194343.9 C (111.0 F)
194440.6 C (105.1 F)
194541.7 C (107.1 F)
194641.7 C (107.1 F)
194742.8 C (109.0 F)
194840.6 C (105.1 F)
194938.9 C (102.0 F)
195035.6 C (96.1 F)
195142.8 C (109.0 F)
195242.2 C (108.0 F)
195340.6 C (105.1 F)
195443.3 C (109.9 F)
195540.6 C (105.1 F)
195643.9 C (111.0 F)
195738.9 C (102.0 F)
195840.0 C (104.0 F)
195939.4 C (102.9 F)
196038.9 C (102.0 F)
196139.4 C (102.9 F)
196241.1 C (106.0 F)
196341.7 C (107.1 F)
196443.3 C (109.9 F)
196540.0 C (104.0 F)
196641.1 C (106.0 F)
196739.4 C (102.9 F)
196837.8 C (100.0 F)
196941.1 C (106.0 F)
197042.2 C (108.0 F)
197141.1 C (106.0 F)
197240.6 C (105.1 F)
197336.7 C (98.1 F)
197442.2 C (108.0 F)
197537.2 C (99.0 F)
197641.1 C (106.0 F)
197741.7 C (107.1 F)
197840.6 C (105.1 F)

Coldest night (TNn)

Coldest night (TNn) at Sulphur Platt Nat'l Pk by year The coldest night of the year at Sulphur Platt Nat'l Pk, 1917 to 1978. The record is -26.1 C (-15.0 F) in 1930, marked on the chart; the median year is -15.6 C (3.9 F). -30-25-20-15-10-5192019401960Record: -26.1 C (-15.0 F) in 1930
The coldest night of the year at Sulphur Platt Nat'l Pk, 1917 to 1978. The record is -26.1 C (-15.0 F) in 1930, marked on the chart; the median year is -15.6 C (3.9 F).
Coldest night (TNn) at Sulphur Platt Nat'l Pk by year
YearColdest night (TNn)
1917-16.1 C (3.0 F)
1918-19.4 C (-2.9 F)
1919-14.4 C (6.1 F)
1920-11.1 C (12.0 F)
1921-11.1 C (12.0 F)
1922-11.7 C (10.9 F)
1923-11.7 C (10.9 F)
1924-17.8 C (0.0 F)
1925-14.4 C (6.1 F)
1926-12.2 C (10.0 F)
1927-13.3 C (8.1 F)
1928-15.6 C (3.9 F)
1929-20.0 C (-4.0 F)
1930-26.1 C (-15.0 F)
1931-10.0 C (14.0 F)
1932-15.6 C (3.9 F)
1933-19.4 C (-2.9 F)
1934-10.6 C (12.9 F)
1935-17.2 C (1.0 F)
1936-17.8 C (0.0 F)
1937-11.7 C (10.9 F)
1938-11.1 C (12.0 F)
1939-11.7 C (10.9 F)
1940-19.4 C (-2.9 F)
1941-8.3 C (17.1 F)
1942-20.0 C (-4.0 F)
1943-18.3 C (-0.9 F)
1944-23.3 C (-9.9 F)
1945-13.3 C (8.1 F)
1946-12.8 C (9.0 F)
1947-20.6 C (-5.1 F)
1948-16.7 C (1.9 F)
1949-15.6 C (3.9 F)
1950-16.7 C (1.9 F)
1951-20.0 C (-4.0 F)
1952-11.1 C (12.0 F)
1953-15.0 C (5.0 F)
1954-15.0 C (5.0 F)
1955-12.2 C (10.0 F)
1956-16.1 C (3.0 F)
1957-13.9 C (7.0 F)
1958-16.7 C (1.9 F)
1959-17.8 C (0.0 F)
1960-12.2 C (10.0 F)
1961-13.9 C (7.0 F)
1962-21.1 C (-6.0 F)
1963-18.3 C (-0.9 F)
1964-17.2 C (1.0 F)
1965-15.0 C (5.0 F)
1966-18.9 C (-2.0 F)
1967-12.8 C (9.0 F)
1968-15.6 C (3.9 F)
1969-16.7 C (1.9 F)
1970-16.1 C (3.0 F)
1971-14.4 C (6.1 F)
1972-15.6 C (3.9 F)
1973-19.4 C (-2.9 F)
1974-12.2 C (10.0 F)
1975-12.8 C (9.0 F)
1976-15.6 C (3.9 F)
1977-25.6 C (-14.1 F)
1978-19.4 C (-2.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Sulphur Platt Nat'l Pk by year The wettest day of the year at Sulphur Platt Nat'l Pk, 1917 to 1978. The record is 294.9 mm (11.6 in) in 1970, marked on the chart; the median year is 77.7 mm (3.1 in). 0100200300192019401960Record: 294.9 mm (11.6 in) in 1970
The wettest day of the year at Sulphur Platt Nat'l Pk, 1917 to 1978. The record is 294.9 mm (11.6 in) in 1970, marked on the chart; the median year is 77.7 mm (3.1 in).
Wettest day (Rx1day) at Sulphur Platt Nat'l Pk by year
YearWettest day (Rx1day)
191761.0 mm (2.4 in)
191876.2 mm (3.0 in)
191974.9 mm (2.9 in)
192066.0 mm (2.6 in)
192145.2 mm (1.8 in)
192257.9 mm (2.3 in)
1923123.4 mm (4.9 in)
1924120.4 mm (4.7 in)
192572.1 mm (2.8 in)
1926109.7 mm (4.3 in)
1927102.4 mm (4.0 in)
1928124.5 mm (4.9 in)
192985.1 mm (3.4 in)
193056.6 mm (2.2 in)
193178.7 mm (3.1 in)
1932186.7 mm (7.4 in)
1933165.1 mm (6.5 in)
193459.7 mm (2.4 in)
1935103.6 mm (4.1 in)
193698.3 mm (3.9 in)
193769.3 mm (2.7 in)
1938123.2 mm (4.9 in)
193942.9 mm (1.7 in)
194095.5 mm (3.8 in)
194192.7 mm (3.6 in)
194267.6 mm (2.7 in)
1943112.5 mm (4.4 in)
194456.4 mm (2.2 in)
1945122.4 mm (4.8 in)
1946100.8 mm (4.0 in)
194779.5 mm (3.1 in)
1948113.0 mm (4.4 in)
194959.7 mm (2.4 in)
195049.5 mm (1.9 in)
195196.5 mm (3.8 in)
195253.3 mm (2.1 in)
1953102.6 mm (4.0 in)
195476.7 mm (3.0 in)
195558.9 mm (2.3 in)
195653.6 mm (2.1 in)
1957108.2 mm (4.3 in)
195838.6 mm (1.5 in)
195989.4 mm (3.5 in)
196065.3 mm (2.6 in)
196171.9 mm (2.8 in)
196288.4 mm (3.5 in)
196357.7 mm (2.3 in)
196461.5 mm (2.4 in)
196546.0 mm (1.8 in)
196657.2 mm (2.3 in)
196780.8 mm (3.2 in)
196865.5 mm (2.6 in)
1969112.3 mm (4.4 in)
1970294.9 mm (11.6 in)
197176.2 mm (3.0 in)
1972118.6 mm (4.7 in)
197386.4 mm (3.4 in)
1974101.3 mm (4.0 in)
197562.7 mm (2.5 in)
197675.7 mm (3.0 in)
197799.6 mm (3.9 in)
197851.6 mm (2.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Sulphur Platt Nat'l Pk by year The wettest five days of the year at Sulphur Platt Nat'l Pk, 1917 to 1978. The record is 346.5 mm (13.6 in) in 1970, marked on the chart; the median year is 120.4 mm (4.7 in). 0100200300400192019401960Record: 346.5 mm (13.6 in) in 1970
The wettest five days of the year at Sulphur Platt Nat'l Pk, 1917 to 1978. The record is 346.5 mm (13.6 in) in 1970, marked on the chart; the median year is 120.4 mm (4.7 in).
Wettest five days (Rx5day) at Sulphur Platt Nat'l Pk by year
YearWettest five days (Rx5day)
191771.4 mm (2.8 in)
191896.3 mm (3.8 in)
1919116.6 mm (4.6 in)
192090.4 mm (3.6 in)
192196.5 mm (3.8 in)
192294.8 mm (3.7 in)
1923179.8 mm (7.1 in)
1924127.0 mm (5.0 in)
1925107.5 mm (4.2 in)
1926181.6 mm (7.1 in)
1927153.2 mm (6.0 in)
1928126.5 mm (5.0 in)
1929129.7 mm (5.1 in)
193081.2 mm (3.2 in)
193198.8 mm (3.9 in)
1932213.4 mm (8.4 in)
1933232.2 mm (9.1 in)
1934114.0 mm (4.5 in)
1935180.8 mm (7.1 in)
1936148.7 mm (5.9 in)
193789.8 mm (3.5 in)
1938235.0 mm (9.3 in)
193946.4 mm (1.8 in)
1940121.1 mm (4.8 in)
1941151.2 mm (6.0 in)
1942121.6 mm (4.8 in)
1943137.1 mm (5.4 in)
194493.2 mm (3.7 in)
1945254.7 mm (10.0 in)
1946210.0 mm (8.3 in)
1947120.1 mm (4.7 in)
1948162.3 mm (6.4 in)
1949117.0 mm (4.6 in)
195076.5 mm (3.0 in)
1951115.8 mm (4.6 in)
195283.1 mm (3.3 in)
1953115.5 mm (4.5 in)
1954170.1 mm (6.7 in)
1955143.0 mm (5.6 in)
195688.9 mm (3.5 in)
1957156.2 mm (6.1 in)
195878.7 mm (3.1 in)
1959229.6 mm (9.0 in)
1960120.7 mm (4.8 in)
196188.7 mm (3.5 in)
196296.7 mm (3.8 in)
196369.3 mm (2.7 in)
1964123.7 mm (4.9 in)
196584.1 mm (3.3 in)
196687.7 mm (3.5 in)
1967181.8 mm (7.2 in)
1968134.4 mm (5.3 in)
1969147.4 mm (5.8 in)
1970346.5 mm (13.6 in)
1971101.6 mm (4.0 in)
1972146.2 mm (5.8 in)
1973148.1 mm (5.8 in)
1974130.5 mm (5.1 in)
197584.3 mm (3.3 in)
197697.2 mm (3.8 in)
1977112.3 mm (4.4 in)
1978102.7 mm (4.0 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Sulphur Platt Nat'l Pk by year The longest dry spell of the year at Sulphur Platt Nat'l Pk, 1917 to 1978. The record is 70 days in 1934, marked on the chart; the median year is 32 days. 020406080192019401960Record: 70 days in 1934
The longest dry spell of the year at Sulphur Platt Nat'l Pk, 1917 to 1978. The record is 70 days in 1934, marked on the chart; the median year is 32 days.
Longest dry spell (CDD) at Sulphur Platt Nat'l Pk by year
YearLongest dry spell (CDD)
191750 days
191832 days
191919 days
192023 days
192135 days
192235 days
192350 days
192428 days
192536 days
192630 days
192721 days
192822 days
192923 days
193026 days
193140 days
193234 days
193335 days
193470 days
193519 days
193634 days
193724 days
193842 days
193925 days
194038 days
194120 days
194226 days
194338 days
194427 days
194537 days
194633 days
194747 days
194836 days
194938 days
195031 days
195130 days
195243 days
195325 days
195437 days
195557 days
195632 days
195727 days
195818 days
195936 days
196032 days
196135 days
196225 days
196354 days
196434 days
196535 days
196628 days
196728 days
196819 days
196931 days
197030 days
197133 days
197237 days
197316 days
197421 days
197516 days
197631 days
197723 days
197822 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

55 years with a frost

Across 55 years with a frost, the median last spring frost at Sulphur Platt Nat'l Pk falls on 7 April and the median first autumn frost on 27 October, which leaves a median of 204 days between them.

Fitted over all years, the growing season changes by -0.2 days per decade at this station.

Frost dates and growing season at Sulphur Platt Nat'l Pk
MeasureMedian, all yearsEarliest periodRecent period (1948 to 1977)Recent against earliestFitted trend
Last spring frost7 Apriln/a7 Apriln/a-0.5 days per decade
First autumn frost27 Octobern/a26 Octobern/a-0.7 days per decade
Growing days204 daysn/a202 daysn/a-0.2 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

57 years, 1919 to 1977

A day with at least 79.3 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 230.6 mm (9.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Sulphur Platt Nat'l Pk: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years79.3 mm (3.1 in)
5 years111.0 mm (4.4 in)
10 years135.1 mm (5.3 in)
25 years169.6 mm (6.7 in)
50 years198.6 mm (7.8 in)
100 years230.6 mm (9.1 in)Longer than the 57 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, 57 years of values from 1919 to 1977.

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: 294.9 mm (11.6 in) in 1970; 186.7 mm (7.4 in) in 1932; 165.1 mm (6.5 in) in 1933.

Station Changes

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

Download the Data

  • Data for Sulphur Platt Nat'l Pk standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Sulphur Platt Nat'l Pk 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).