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Built 2026-10-15 (15 October 2026)

Mammoth Rs Weather Records (USC00425352)

Record envelope, standing records and threshold days for Mammoth Rs (USC00425352), Utah, United States, with 45 years of record.

Key Facts for Mammoth Rs

  • Mammoth Rs (USC00425352) is a weather station in Utah, United States at 39.70 latitude and -111.30 longitude, 2,623 m (8,606 ft) above sea level.
  • The station reports from 1896 to 1940, 45 years of record.
  • 1,464 records set at Mammoth Rs still stand.
  • Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

  • Location: Utah, United States, 39.70 latitude, -111.30 longitude.
  • Elevation: 2,623 m (8,606 ft).
  • Period of record: 1896 to 1940, 45 years.
  • Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Mammoth Rs, with 2026 drawn through them The band shows the record high and record low for each calendar day at Mammoth Rs. The lines show the 2026 daily maximum and minimum. 0 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 Mammoth Rs. 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 Mammoth Rs, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan9.4 C (48.9 F)-12.8 C (9.0 F)n/an/a
Feb11.7 C (53.1 F)-22.2 C (-8.0 F)n/an/a
Mar18.9 C (66.0 F)-16.7 C (1.9 F)n/an/a
Apr23.9 C (75.0 F)-10.6 C (12.9 F)n/an/a
May33.9 C (93.0 F)-4.4 C (24.1 F)n/an/a
Jun33.9 C (93.0 F)5.6 C (42.1 F)n/an/a
Jul35.6 C (96.1 F)9.4 C (48.9 F)n/an/a
Aug36.1 C (97.0 F)11.1 C (52.0 F)n/an/a
Sep30.0 C (86.0 F)2.8 C (37.0 F)n/an/a
Oct24.4 C (75.9 F)-2.8 C (27.0 F)n/an/a
Nov14.4 C (57.9 F)-17.2 C (1.0 F)n/an/a
Dec12.2 C (54.0 F)-8.3 C (17.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Mammoth Rs by the year they were set 1,464 records at Mammoth Rs still stand. 1896 holds the most, with 1,104. 05001,0001,5001896: 1,1041897: 36018961897
1,464 records at Mammoth Rs still stand. 1896 holds the most, with 1,104.
Standing records at Mammoth Rs by the year they were set
Year setStanding records
18961,104
1897360

Wettest Day of Each Month

Oct: 66.0 mm (2.6 in)
Record daily precipitation for each month at Mammoth Rs The wettest day on record for each calendar month at Mammoth Rs. The most was 66.0 mm (2.6 in) on 2 October 1916. 020406080 Jan: 20.3 mm (0.8 in), 29 January 1897 Jan Feb: 30.5 mm (1.2 in), 5 February 1897 Feb Mar: 10.2 mm (0.4 in), 18 March 1897 Mar Apr: 6.4 mm (0.25 in), 19 April 1896 Apr May: 39.4 mm (1.6 in), 29 May 1935 May Jun: 33.0 mm (1.3 in), 12 June 1928 Jun Jul: 48.3 mm (1.9 in), 26 July 1916 Jul Aug: 25.4 mm (1.0 in), 1 August 1920 Aug Sep: 50.8 mm (2.0 in), 25 September 1918 Sep Oct: 66.0 mm (2.6 in), 2 October 1916 Oct Nov: 15.2 mm (0.6 in), 10 November 1896 Nov Dec: 0.0 mm (0.00 in), 1 December 1896 Dec
The wettest day on record for each calendar month at Mammoth Rs. The most was 66.0 mm (2.6 in) on 2 October 1916.
Record daily precipitation for each month at Mammoth Rs
MonthRecord daily precipitation (mm)Date
Jan20.3 mm (0.8 in)29 January 1897
Feb30.5 mm (1.2 in)5 February 1897
Mar10.2 mm (0.4 in)18 March 1897
Apr6.4 mm (0.25 in)19 April 1896
May39.4 mm (1.6 in)29 May 1935
Jun33.0 mm (1.3 in)12 June 1928
Jul48.3 mm (1.9 in)26 July 1916
Aug25.4 mm (1.0 in)1 August 1920
Sep50.8 mm (2.0 in)25 September 1918
Oct66.0 mm (2.6 in)2 October 1916
Nov15.2 mm (0.6 in)10 November 1896
Dec0.0 mm (0.00 in)1 December 1896

Period of Record Coverage

1896 to 1897
Days with data per year at Mammoth Rs 2 years of record at Mammoth Rs, 1896 to 1897. 1 years have data for under 90 percent of days and are left out of rankings: 1897. 1896: 335 of 366 days1897: 150 of 365 days
2 years of record at Mammoth Rs, 1896 to 1897. 1 years have data for under 90 percent of days and are left out of rankings: 1897.
Days with data per year at Mammoth Rs
YearDays with dataShare of yearComplete
189633592%Yes
189715041%No

Latest Records

0

No records were set at this station in the latest data.

Extremes by Year

1896 to 1940
Yearly extremes at Mammoth Rs: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)36.1 C (97.0 F)189635.0 C (95.0 F)2
Coldest night (TNn)-22.2 C (-8.0 F)1896-20.2 C (-4.5 F)2
Wettest day (Rx1day)66.0 mm (2.6 in)191624.1 mm (0.9 in)27
Wettest five days (Rx5day)88.9 mm (3.5 in)189733.0 mm (1.3 in)25
Longest dry spell (CDD)36 days189621 days25

Hottest day (TXx)

Hottest day (TXx) at Mammoth Rs by year The hottest day of the year at Mammoth Rs, 1896 to 1940. The record is 36.1 C (97.0 F) in 1896, marked on the chart; the median year is 35.0 C (95.0 F). 333435363719001910192019301940Record: 36.1 C (97.0 F) in 1896
The hottest day of the year at Mammoth Rs, 1896 to 1940. The record is 36.1 C (97.0 F) in 1896, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Mammoth Rs by year
YearHottest day (TXx)
189636.1 C (97.0 F)
189733.9 C (93.0 F)
1916n/a
1917n/a
1918n/a
1919n/a
1920n/a
1921n/a
1922n/a
1923n/a
1924n/a
1925n/a
1926n/a
1927n/a
1928n/a
1929n/a
1930n/a
1931n/a
1932n/a
1933n/a
1934n/a
1935n/a
1936n/a
1937n/a
1938n/a
1939n/a
1940n/a

Coldest night (TNn)

Coldest night (TNn) at Mammoth Rs by year The coldest night of the year at Mammoth Rs, 1896 to 1940. The record is -22.2 C (-8.0 F) in 1896, marked on the chart; the median year is -20.2 C (-4.5 F). -23-22-21-20-19-1819001910192019301940Record: -22.2 C (-8.0 F) in 1896
The coldest night of the year at Mammoth Rs, 1896 to 1940. The record is -22.2 C (-8.0 F) in 1896, marked on the chart; the median year is -20.2 C (-4.5 F).
Coldest night (TNn) at Mammoth Rs by year
YearColdest night (TNn)
1896-22.2 C (-8.0 F)
1897-18.3 C (-0.9 F)
1916n/a
1917n/a
1918n/a
1919n/a
1920n/a
1921n/a
1922n/a
1923n/a
1924n/a
1925n/a
1926n/a
1927n/a
1928n/a
1929n/a
1930n/a
1931n/a
1932n/a
1933n/a
1934n/a
1935n/a
1936n/a
1937n/a
1938n/a
1939n/a
1940n/a

Wettest day (Rx1day)

Wettest day (Rx1day) at Mammoth Rs by year The wettest day of the year at Mammoth Rs, 1896 to 1940. The record is 66.0 mm (2.6 in) in 1916, marked on the chart; the median year is 24.1 mm (0.9 in). 02040608019001910192019301940Record: 66.0 mm (2.6 in) in 1916
The wettest day of the year at Mammoth Rs, 1896 to 1940. The record is 66.0 mm (2.6 in) in 1916, marked on the chart; the median year is 24.1 mm (0.9 in).
Wettest day (Rx1day) at Mammoth Rs by year
YearWettest day (Rx1day)
189647.0 mm (1.9 in)
189730.5 mm (1.2 in)
191666.0 mm (2.6 in)
191722.9 mm (0.9 in)
191850.8 mm (2.0 in)
191920.3 mm (0.8 in)
192025.4 mm (1.0 in)
192124.1 mm (0.9 in)
192221.6 mm (0.9 in)
192322.4 mm (0.9 in)
192430.5 mm (1.2 in)
192529.2 mm (1.1 in)
192616.5 mm (0.6 in)
192727.4 mm (1.1 in)
192833.0 mm (1.3 in)
192920.6 mm (0.8 in)
193027.9 mm (1.1 in)
193110.2 mm (0.4 in)
193218.8 mm (0.7 in)
193311.9 mm (0.5 in)
193424.1 mm (0.9 in)
193539.4 mm (1.6 in)
193626.7 mm (1.1 in)
193712.7 mm (0.5 in)
193814.7 mm (0.6 in)
193933.0 mm (1.3 in)
19407.9 mm (0.31 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Mammoth Rs by year The wettest five days of the year at Mammoth Rs, 1896 to 1940. The record is 88.9 mm (3.5 in) in 1897, marked on the chart; the median year is 33.0 mm (1.3 in). 025507510019001910192019301940Record: 88.9 mm (3.5 in) in 1897
The wettest five days of the year at Mammoth Rs, 1896 to 1940. The record is 88.9 mm (3.5 in) in 1897, marked on the chart; the median year is 33.0 mm (1.3 in).
Wettest five days (Rx5day) at Mammoth Rs by year
YearWettest five days (Rx5day)
189647.5 mm (1.9 in)
189788.9 mm (3.5 in)
191666.0 mm (2.6 in)
1917n/a
1918n/a
191924.1 mm (0.9 in)
192038.9 mm (1.5 in)
192135.6 mm (1.4 in)
192248.2 mm (1.9 in)
192347.1 mm (1.9 in)
192430.5 mm (1.2 in)
192533.0 mm (1.3 in)
192624.1 mm (0.9 in)
192736.3 mm (1.4 in)
19285.1 mm (0.20 in)
192933.0 mm (1.3 in)
193077.5 mm (3.1 in)
19317.6 mm (0.30 in)
193240.2 mm (1.6 in)
193318.3 mm (0.7 in)
193428.0 mm (1.1 in)
193510.9 mm (0.4 in)
193641.2 mm (1.6 in)
193729.8 mm (1.2 in)
193824.4 mm (1.0 in)
193940.7 mm (1.6 in)
194013.5 mm (0.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Mammoth Rs by year The longest dry spell of the year at Mammoth Rs, 1896 to 1940. The record is 36 days in 1896, marked on the chart; the median year is 21 days. 01020304019001910192019301940Record: 36 days in 1896
The longest dry spell of the year at Mammoth Rs, 1896 to 1940. The record is 36 days in 1896, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Mammoth Rs by year
YearLongest dry spell (CDD)
189636 days
189721 days
191629 days
1917n/a
1918n/a
191914 days
192028 days
192116 days
192227 days
192318 days
19249 days
192512 days
192629 days
192711 days
192826 days
19299 days
193017 days
193127 days
193223 days
193321 days
193429 days
193530 days
193626 days
193712 days
193814 days
193929 days
194012 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 Mammoth Rs standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Mammoth Rs 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).