Thermopolis 9NE Weather Records (USC00488884)

Record envelope, standing records and threshold days for Thermopolis 9NE (USC00488884), Wyoming, United States, with 36 years of record.

Key Facts for Thermopolis 9NE

Thermopolis 9NE (USC00488884) is a weather station in Wyoming, United States at 43.75 latitude and -108.14 longitude, 1,305 m (4,282 ft) above sea level.
The station reports from 1991 to 2026, 36 years of record.
1,464 records set at Thermopolis 9NE still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Thermopolis 9NE set a daily record precipitation of 11.4 mm (0.4 in) on 19 August 2026 (provisional).

Provisional Records

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

About the Station

Location: Wyoming, United States, 43.75 latitude, -108.14 longitude.
Elevation: 1,305 m (4,282 ft).
Period of record: 1991 to 2026, 36 years.
Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

67 days at or beyond a record

The band shows the record high and record low for each calendar day at Thermopolis 9NE. The lines show the 2026 daily maximum and minimum. 67 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Thermopolis 9NE, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.7 C (62.1 F)	-43.9 C (-47.0 F)	16.7 C (62.1 F)	-27.8 C (-18.0 F)
Feb	18.9 C (66.0 F)	-37.8 C (-36.0 F)	18.9 C (66.0 F)	-28.9 C (-20.0 F)
Mar	30.0 C (86.0 F)	-31.7 C (-25.1 F)	30.0 C (86.0 F)	-12.8 C (9.0 F)
Apr	30.6 C (87.1 F)	-20.6 C (-5.1 F)	28.3 C (82.9 F)	-11.1 C (12.0 F)
May	34.4 C (93.9 F)	-10.6 C (12.9 F)	33.3 C (91.9 F)	-6.7 C (19.9 F)
Jun	37.8 C (100.0 F)	-2.8 C (27.0 F)	35.6 C (96.1 F)	0.6 C (33.1 F)
Jul	40.6 C (105.1 F)	2.2 C (36.0 F)	40.6 C (105.1 F)	6.1 C (43.0 F)
Aug	38.9 C (102.0 F)	0.6 C (33.1 F)	37.2 C (99.0 F)	3.3 C (37.9 F)
Sep	38.9 C (102.0 F)	-5.0 C (23.0 F)	32.8 C (91.0 F)	1.7 C (35.1 F)
Oct	31.1 C (88.0 F)	-23.3 C (-9.9 F)	30.6 C (87.1 F)	-3.9 C (25.0 F)
Nov	23.3 C (73.9 F)	-36.7 C (-34.1 F)	n/a	n/a
Dec	18.3 C (64.9 F)	-44.4 C (-47.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Thermopolis 9NE still stand. 2006 holds the most, with 86.

Standing records at Thermopolis 9NE by the year they were set
Year set	Standing records
2005	12
2006	86
2007	71
2008	79
2009	81
2010	62
2011	63
2012	79
2013	63
2014	78
2015	72
2016	67
2017	71
2018	55
2019	57
2020	47
2021	66
2022	76
2023	66
2024	70
2025	65
2026	78

Wettest Day of Each Month

Apr: 152.4 mm (6.0 in)

The wettest day on record for each calendar month at Thermopolis 9NE. The most was 152.4 mm (6.0 in) on 1 April 1997.

Record daily precipitation for each month at Thermopolis 9NE
Month	Record daily precipitation (mm)	Date
Jan	27.9 mm (1.1 in)	16 January 1995
Feb	18.8 mm (0.7 in)	28 February 2004
Mar	33.5 mm (1.3 in)	29 March 1998
Apr	152.4 mm (6.0 in)	1 April 1997
May	46.5 mm (1.8 in)	28 May 2019
Jun	36.8 mm (1.4 in)	10 June 2011
Jul	31.2 mm (1.2 in)	16 July 2026
Aug	40.6 mm (1.6 in)	20 August 2021
Sep	42.7 mm (1.7 in)	22 September 2000
Oct	48.3 mm (1.9 in)	12 October 2023
Nov	25.9 mm (1.0 in)	8 November 1998
Dec	34.5 mm (1.4 in)	15 December 2014

Period of Record Coverage

2005 to 2026

22 years of record at Thermopolis 9NE, 2005 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 2005, 2006, 2008, 2026.

Days with data per year at Thermopolis 9NE
Year	Days with data	Share of year	Complete
2005	87	24%	No
2006	295	81%	No
2007	351	96%	Yes
2008	320	87%	No
2009	339	93%	Yes
2010	357	98%	Yes
2011	355	97%	Yes
2012	361	99%	Yes
2013	361	99%	Yes
2014	358	98%	Yes
2015	363	99%	Yes
2016	366	100%	Yes
2017	364	100%	Yes
2018	365	100%	Yes
2019	365	100%	Yes
2020	366	100%	Yes
2021	364	100%	Yes
2022	365	100%	Yes
2023	365	100%	Yes
2024	362	99%	Yes
2025	364	100%	Yes
2026	286	78%	No

Latest Records

Latest records at Thermopolis 9NE
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
19 August 2026	Thermopolis 9NE, US	daily rain (Provisional)	11.4 mm (0.4 in)	2.5 mm (0.10 in)	8 years	10 of 100 (Routine)
15 August 2026	Thermopolis 9NE, US	daily rain	7.9 mm (0.31 in)	4.6 mm (0.18 in)	12 years	15 of 100 (Routine)
14 August 2026	Thermopolis 9NE, US	daily rain	2.8 mm (0.11 in)	0.8 mm (0.03 in)	16 years	8 of 100 (Routine)
27 July 2026	Thermopolis 9NE, US	daily rain	7.6 mm (0.30 in)	4.0 mm (0.16 in)	8 years	15 of 100 (Routine)
16 July 2026	Thermopolis 9NE, US	monthly rain	31.2 mm (1.2 in)	12.1 mm (0.5 in)	32 years	54 of 100 (Notable)
8 July 2026	Thermopolis 9NE, US	daily rain	16.5 mm (0.6 in)	10.7 mm (0.4 in)	12 years	20 of 100 (Routine)
4 April 2026	Thermopolis 9NE, US	daily rain	5.6 mm (0.22 in)	0.5 mm (0.02 in)	32 years	12 of 100 (Routine)
4 April 2026	Thermopolis 9NE, US	daily snowfall (Tie)	10.2 cm (4.0 in)	tie	32 years	3 of 100 (Routine)
15 March 2026	Thermopolis 9NE, US	daily snowfall	7.1 cm (2.8 in)	3.3 cm (1.3 in)	17 years	12 of 100 (Routine)
19 February 2026	Thermopolis 9NE, US	daily rain	6.9 mm (0.27 in)	6.1 mm (0.24 in)	8 years	20 of 100 (Routine)
19 February 2026	Thermopolis 9NE, US	daily snowfall	10.9 cm (4.3 in)	8.4 cm (3.3 in)	8 years	26 of 100 (Routine)
27 December 2025	Thermopolis 9NE, US	daily rain	3.6 mm (0.14 in)	1.1 mm (0.04 in)	16 years	10 of 100 (Routine)
18 December 2025	Thermopolis 9NE, US	daily rain	1.0 mm (0.04 in)	0.2 mm (0.01 in)	23 years	9 of 100 (Routine)
17 October 2025	Thermopolis 9NE, US	daily rain	7.6 mm (0.30 in)	0.2 mm (0.01 in)	14 years	7 of 100 (Routine)
5 October 2025	Thermopolis 9NE, US	daily rain	24.6 mm (1.0 in)	8.9 mm (0.35 in)	20 years	19 of 100 (Routine)
23 September 2025	Thermopolis 9NE, US	daily rain	21.3 mm (0.8 in)	7.3 mm (0.29 in)	8 years	15 of 100 (Routine)
29 August 2025	Thermopolis 9NE, US	daily rain	13.2 mm (0.5 in)	9.4 mm (0.37 in)	23 years	20 of 100 (Routine)
1 August 2025	Thermopolis 9NE, US	daily rain	8.9 mm (0.35 in)	4.6 mm (0.18 in)	2 years	12 of 100 (Routine)
24 July 2025	Thermopolis 9NE, US	daily rain	7.1 mm (0.28 in)	3.0 mm (0.12 in)	28 years	19 of 100 (Routine)
19 July 2025	Thermopolis 9NE, US	daily rain	6.1 mm (0.24 in)	0.5 mm (0.02 in)	32 years	13 of 100 (Routine)

Climate Trend

18 complete years, 2007 to 2025

One stripe for each of 18 complete years at Thermopolis 9NE, 2007 to 2025. Blue stripes are years cooler than the station's own mean of 6.0 C (42.8 F); red stripes are warmer. The coolest year was 2019, at 4.5 C (40.0 F), and the warmest was 2012, at 7.7 C (45.9 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Thermopolis 9NE as warming stripes, 2007 to 2025
Year	Annual mean temperature	Difference from the station mean
2007	6.5 C	+0.44 C
2009	5.3 C	-0.71 C
2010	5.9 C	-0.12 C
2011	5.1 C	-0.96 C
2012	7.7 C	+1.70 C
2013	5.4 C	-0.62 C
2014	5.2 C	-0.86 C
2015	6.6 C	+0.62 C
2016	6.8 C	+0.81 C
2017	6.0 C	-0.05 C
2018	5.1 C	-0.93 C
2019	4.5 C	-1.54 C
2020	6.1 C	+0.12 C
2021	6.8 C	+0.83 C
2022	5.4 C	-0.60 C
2023	5.5 C	-0.47 C
2024	7.1 C	+1.05 C
2025	7.3 C	+1.27 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

1991 to 2026

Yearly extremes at Thermopolis 9NE: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.6 C (105.1 F)	2026	37.2 C (99.0 F)	22
Coldest night (TNn)	-44.4 C (-47.9 F)	2022	-35.6 C (-32.1 F)	22
Wettest day (Rx1day)	152.4 mm (6.0 in)	1997	30.9 mm (1.2 in)	36
Wettest five days (Rx5day)	152.9 mm (6.0 in)	1997	51.7 mm (2.0 in)	36
Longest dry spell (CDD)	59 days	1999	36 days	36

Hottest day (TXx)

The hottest day of the year at Thermopolis 9NE, 1991 to 2026. The record is 40.6 C (105.1 F) in 2026, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Thermopolis 9NE by year
Year	Hottest day (TXx)
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	30.6 C (87.1 F)
2006	38.3 C (100.9 F)
2007	37.2 C (99.0 F)
2008	37.2 C (99.0 F)
2009	35.6 C (96.1 F)
2010	37.2 C (99.0 F)
2011	36.7 C (98.1 F)
2012	37.8 C (100.0 F)
2013	36.7 C (98.1 F)
2014	37.2 C (99.0 F)
2015	36.1 C (97.0 F)
2016	36.7 C (98.1 F)
2017	35.6 C (96.1 F)
2018	38.3 C (100.9 F)
2019	35.6 C (96.1 F)
2020	36.7 C (98.1 F)
2021	37.8 C (100.0 F)
2022	38.9 C (102.0 F)
2023	36.7 C (98.1 F)
2024	37.8 C (100.0 F)
2025	37.2 C (99.0 F)
2026	40.6 C (105.1 F)

Coldest night (TNn)

The coldest night of the year at Thermopolis 9NE, 1991 to 2026. The record is -44.4 C (-47.9 F) in 2022, marked on the chart; the median year is -35.6 C (-32.1 F).

Coldest night (TNn) at Thermopolis 9NE by year
Year	Coldest night (TNn)
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	-35.6 C (-32.1 F)
2006	-26.1 C (-15.0 F)
2007	-35.6 C (-32.1 F)
2008	-36.1 C (-33.0 F)
2009	-38.3 C (-36.9 F)
2010	-37.2 C (-35.0 F)
2011	-37.2 C (-35.0 F)
2012	-27.8 C (-18.0 F)
2013	-30.6 C (-23.1 F)
2014	-38.9 C (-38.0 F)
2015	-36.7 C (-34.1 F)
2016	-34.4 C (-29.9 F)
2017	-36.1 C (-33.0 F)
2018	-32.8 C (-27.0 F)
2019	-33.9 C (-29.0 F)
2020	-28.3 C (-18.9 F)
2021	-30.0 C (-22.0 F)
2022	-44.4 C (-47.9 F)
2023	-43.9 C (-47.0 F)
2024	-39.4 C (-38.9 F)
2025	-29.4 C (-20.9 F)
2026	-28.9 C (-20.0 F)

Wettest day (Rx1day)

The wettest day of the year at Thermopolis 9NE, 1991 to 2026. The record is 152.4 mm (6.0 in) in 1997, marked on the chart; the median year is 30.9 mm (1.2 in).

Wettest day (Rx1day) at Thermopolis 9NE by year
Year	Wettest day (Rx1day)
1991	3.8 mm (0.15 in)
1992	20.3 mm (0.8 in)
1993	41.9 mm (1.6 in)
1994	39.4 mm (1.6 in)
1995	27.9 mm (1.1 in)
1996	27.7 mm (1.1 in)
1997	152.4 mm (6.0 in)
1998	36.1 mm (1.4 in)
1999	18.3 mm (0.7 in)
2000	42.7 mm (1.7 in)
2001	21.8 mm (0.9 in)
2002	27.4 mm (1.1 in)
2003	30.5 mm (1.2 in)
2004	29.2 mm (1.1 in)
2005	38.6 mm (1.5 in)
2006	20.1 mm (0.8 in)
2007	34.5 mm (1.4 in)
2008	39.9 mm (1.6 in)
2009	14.7 mm (0.6 in)
2010	23.6 mm (0.9 in)
2011	38.6 mm (1.5 in)
2012	13.2 mm (0.5 in)
2013	37.6 mm (1.5 in)
2014	34.5 mm (1.4 in)
2015	15.5 mm (0.6 in)
2016	44.7 mm (1.8 in)
2017	24.4 mm (1.0 in)
2018	34.5 mm (1.4 in)
2019	46.5 mm (1.8 in)
2020	16.8 mm (0.7 in)
2021	40.6 mm (1.6 in)
2022	32.0 mm (1.3 in)
2023	48.3 mm (1.9 in)
2024	27.9 mm (1.1 in)
2025	24.6 mm (1.0 in)
2026	31.2 mm (1.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Thermopolis 9NE, 1991 to 2026. The record is 152.9 mm (6.0 in) in 1997, marked on the chart; the median year is 51.7 mm (2.0 in).

Wettest five days (Rx5day) at Thermopolis 9NE by year
Year	Wettest five days (Rx5day)
1991	4.8 mm (0.19 in)
1992	53.3 mm (2.1 in)
1993	60.2 mm (2.4 in)
1994	56.5 mm (2.2 in)
1995	51.8 mm (2.0 in)
1996	63.2 mm (2.5 in)
1997	152.9 mm (6.0 in)
1998	51.5 mm (2.0 in)
1999	34.6 mm (1.4 in)
2000	67.6 mm (2.7 in)
2001	26.7 mm (1.1 in)
2002	32.0 mm (1.3 in)
2003	55.9 mm (2.2 in)
2004	31.7 mm (1.2 in)
2005	67.3 mm (2.6 in)
2006	23.4 mm (0.9 in)
2007	47.5 mm (1.9 in)
2008	82.5 mm (3.2 in)
2009	18.8 mm (0.7 in)
2010	66.5 mm (2.6 in)
2011	74.5 mm (2.9 in)
2012	30.1 mm (1.2 in)
2013	54.9 mm (2.2 in)
2014	58.5 mm (2.3 in)
2015	31.5 mm (1.2 in)
2016	59.9 mm (2.4 in)
2017	43.4 mm (1.7 in)
2018	35.5 mm (1.4 in)
2019	71.1 mm (2.8 in)
2020	18.5 mm (0.7 in)
2021	62.0 mm (2.4 in)
2022	35.0 mm (1.4 in)
2023	59.0 mm (2.3 in)
2024	45.2 mm (1.8 in)
2025	44.9 mm (1.8 in)
2026	35.1 mm (1.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Thermopolis 9NE, 1991 to 2026. The record is 59 days in 1999, marked on the chart; the median year is 36 days.

Longest dry spell (CDD) at Thermopolis 9NE by year
Year	Longest dry spell (CDD)
1991	18 days
1992	47 days
1993	34 days
1994	44 days
1995	32 days
1996	29 days
1997	31 days
1998	26 days
1999	59 days
2000	26 days
2001	30 days
2002	37 days
2003	46 days
2004	39 days
2005	37 days
2006	32 days
2007	36 days
2008	44 days
2009	48 days
2010	26 days
2011	31 days
2012	53 days
2013	28 days
2014	38 days
2015	36 days
2016	49 days
2017	29 days
2018	34 days
2019	45 days
2020	44 days
2021	43 days
2022	40 days
2023	29 days
2024	42 days
2025	21 days
2026	20 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

31 years, 1992 to 2025

A day with at least 29.5 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 113.3 mm (4.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Thermopolis 9NE: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	29.5 mm (1.2 in)
5 years	44.0 mm (1.7 in)
10 years	56.3 mm (2.2 in)
25 years	75.3 mm (3.0 in)
50 years	92.7 mm (3.6 in)	Longer than the 31 years of record
100 years	113.3 mm (4.5 in)	Longer than the 31 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, 31 years of values from 1992 to 2025.

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: 152.4 mm (6.0 in) in 1997; 48.3 mm (1.9 in) in 2023; 46.5 mm (1.8 in) in 2019.

Download the Data

Data for Thermopolis 9NE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Thermopolis 9NE 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 2026-10-15. Last revised 15 October 2026 (2026-10-15).