Riverton Weather Records (USW00024061)

Record envelope, standing records and threshold days for Riverton (USW00024061), Wyoming, United States, with 31 years of record.

Key Facts for Riverton

Riverton (USW00024061) is a weather station in Wyoming, United States at 43.07 latitude and -108.48 longitude, 1,717 m (5,633 ft) above sea level.
The station reports from 1996 to 2026, 31 years of record.
1,464 records set at Riverton still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Wyoming, United States, 43.07 latitude, -108.48 longitude.
Elevation: 1,717 m (5,633 ft).
Period of record: 1996 to 2026, 31 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

36 days at or beyond a record

The band shows the record high and record low for each calendar day at Riverton. The lines show the 2026 daily maximum and minimum. 36 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Riverton, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	17.2 C (63.0 F)	-35.0 C (-31.0 F)	2.2 C (36.0 F)	-28.2 C (-18.8 F)
Feb	16.7 C (62.1 F)	-33.2 C (-27.8 F)	15.0 C (59.0 F)	-20.5 C (-4.9 F)
Mar	24.4 C (75.9 F)	-24.9 C (-12.8 F)	22.8 C (73.0 F)	-14.3 C (6.3 F)
Apr	29.4 C (84.9 F)	-16.6 C (2.1 F)	25.6 C (78.1 F)	-8.8 C (16.2 F)
May	33.9 C (93.0 F)	-7.2 C (19.0 F)	28.9 C (84.0 F)	-0.5 C (31.1 F)
Jun	37.8 C (100.0 F)	0.0 C (32.0 F)	36.1 C (97.0 F)	3.9 C (39.0 F)
Jul	38.9 C (102.0 F)	4.4 C (39.9 F)	37.2 C (99.0 F)	8.9 C (48.0 F)
Aug	37.2 C (99.0 F)	2.2 C (36.0 F)	37.2 C (99.0 F)	8.3 C (46.9 F)
Sep	37.8 C (100.0 F)	-6.1 C (21.0 F)	31.1 C (88.0 F)	4.4 C (39.9 F)
Oct	28.9 C (84.0 F)	-22.7 C (-8.9 F)	27.8 C (82.0 F)	-7.8 C (18.0 F)
Nov	21.7 C (71.1 F)	-23.9 C (-11.0 F)	21.7 C (71.1 F)	-14.4 C (6.1 F)
Dec	17.8 C (64.0 F)	-34.9 C (-30.8 F)	17.8 C (64.0 F)	-17.2 C (1.0 F)

Which Years Hold Standing Records

1,464 standing records

1,464 records at Riverton still stand. 2003 holds the most, with 80.

Standing records at Riverton by the year they were set
Year set	Standing records
1996	36
1997	44
1998	36
1999	54
2000	72
2001	44
2002	61
2003	80
2004	56
2005	55
2006	53
2007	60
2008	47
2009	74
2010	46
2011	40
2012	58
2013	30
2014	2
2015	68
2016	41
2017	44
2018	32
2019	37
2020	47
2021	57
2022	42
2023	64
2024	30
2025	54

Wettest Day of Each Month

Mar: 67.1 mm (2.6 in)

The wettest day on record for each calendar month at Riverton. The most was 67.1 mm (2.6 in) on 31 March 2017.

Record daily precipitation for each month at Riverton
Month	Record daily precipitation (mm)	Date
Jan	15.7 mm (0.6 in)	11 January 2023
Feb	15.7 mm (0.6 in)	23 February 2017
Mar	67.1 mm (2.6 in)	31 March 2017
Apr	26.4 mm (1.0 in)	30 April 2018
May	50.8 mm (2.0 in)	26 May 2008
Jun	26.7 mm (1.1 in)	12 June 2010
Jul	16.3 mm (0.6 in)	25 July 2007
Aug	17.5 mm (0.7 in)	15 August 2009
Sep	28.2 mm (1.1 in)	11 September 2019
Oct	28.2 mm (1.1 in)	11 October 2023
Nov	18.0 mm (0.7 in)	23 November 2023
Dec	12.4 mm (0.5 in)	25 December 2016

Period of Record Coverage

1996 to 2025

30 years of record at Riverton, 1996 to 2025. 3 years have data for under 90 percent of days and are left out of rankings: 1996, 2013, 2014.

Days with data per year at Riverton
Year	Days with data	Share of year	Complete
1996	179	49%	No
1997	358	98%	Yes
1998	363	99%	Yes
1999	365	100%	Yes
2000	362	99%	Yes
2001	363	99%	Yes
2002	364	100%	Yes
2003	364	100%	Yes
2004	366	100%	Yes
2005	364	100%	Yes
2006	365	100%	Yes
2007	363	99%	Yes
2008	363	99%	Yes
2009	363	99%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	364	99%	Yes
2013	163	45%	No
2014	1	0%	No
2015	365	100%	Yes
2016	365	100%	Yes
2017	363	99%	Yes
2018	365	100%	Yes
2019	365	100%	Yes
2020	366	100%	Yes
2021	365	100%	Yes
2022	364	100%	Yes
2023	365	100%	Yes
2024	366	100%	Yes
2025	362	99%	Yes

Latest Records

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

Climate Trend

27 complete years, 1997 to 2025

One stripe for each of 27 complete years at Riverton, 1997 to 2025. Blue stripes are years cooler than the station's own mean of 7.3 C (45.2 F); red stripes are warmer. The coolest year was 2023, at 5.4 C (41.7 F), and the warmest was 2012, at 9.3 C (48.7 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Riverton as warming stripes, 1997 to 2025
Year	Annual mean temperature	Difference from the station mean
1997	6.7 C	-0.68 C
1998	7.1 C	-0.23 C
1999	8.0 C	+0.67 C
2000	7.1 C	-0.25 C
2001	7.4 C	+0.10 C
2002	6.4 C	-0.96 C
2003	7.5 C	+0.20 C
2004	7.2 C	-0.16 C
2005	8.0 C	+0.63 C
2006	8.4 C	+1.05 C
2007	8.0 C	+0.70 C
2008	6.8 C	-0.55 C
2009	6.7 C	-0.69 C
2010	6.9 C	-0.42 C
2011	6.9 C	-0.43 C
2012	9.3 C	+1.91 C
2015	8.3 C	+0.91 C
2016	8.1 C	+0.72 C
2017	7.0 C	-0.38 C
2018	6.8 C	-0.50 C
2019	5.5 C	-1.85 C
2020	6.9 C	-0.42 C
2021	8.3 C	+0.95 C
2022	6.9 C	-0.48 C
2023	5.4 C	-1.95 C
2024	8.3 C	+0.95 C
2025	8.5 C	+1.14 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

1996 to 2026

Yearly extremes at Riverton: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	2026	37.2 C (99.0 F)	31
Coldest night (TNn)	-35.0 C (-31.0 F)	2023	-28.2 C (-18.8 F)	31
Wettest day (Rx1day)	67.1 mm (2.6 in)	2017	23.9 mm (0.9 in)	29
Wettest five days (Rx5day)	104.6 mm (4.1 in)	2008	38.0 mm (1.5 in)	28
Longest dry spell (CDD)	75 days	2012	43 days	29

Hottest day (TXx)

The hottest day of the year at Riverton, 1996 to 2026. The record is 40.0 C (104.0 F) in 2026, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Riverton by year
Year	Hottest day (TXx)
1996	37.2 C (99.0 F)
1997	36.7 C (98.1 F)
1998	38.3 C (100.9 F)
1999	34.4 C (93.9 F)
2000	37.2 C (99.0 F)
2001	37.2 C (99.0 F)
2002	37.8 C (100.0 F)
2003	37.8 C (100.0 F)
2004	35.0 C (95.0 F)
2005	38.9 C (102.0 F)
2006	38.9 C (102.0 F)
2007	37.8 C (100.0 F)
2008	37.2 C (99.0 F)
2009	35.6 C (96.1 F)
2010	35.6 C (96.1 F)
2011	36.1 C (97.0 F)
2012	37.8 C (100.0 F)
2013	35.6 C (96.1 F)
2014	-19.9 C (-3.8 F)
2015	35.0 C (95.0 F)
2016	36.7 C (98.1 F)
2017	35.6 C (96.1 F)
2018	37.2 C (99.0 F)
2019	36.1 C (97.0 F)
2020	36.1 C (97.0 F)
2021	37.8 C (100.0 F)
2022	37.8 C (100.0 F)
2023	35.0 C (95.0 F)
2024	37.2 C (99.0 F)
2025	37.2 C (99.0 F)
2026	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at Riverton, 1996 to 2026. The record is -35.0 C (-31.0 F) in 2023, marked on the chart; the median year is -28.2 C (-18.8 F).

Coldest night (TNn) at Riverton by year
Year	Coldest night (TNn)
1996	-23.9 C (-11.0 F)
1997	-25.0 C (-13.0 F)
1998	-29.4 C (-20.9 F)
1999	-16.7 C (1.9 F)
2000	-23.9 C (-11.0 F)
2001	-26.1 C (-15.0 F)
2002	-24.4 C (-11.9 F)
2003	-28.9 C (-20.0 F)
2004	-28.9 C (-20.0 F)
2005	-27.8 C (-18.0 F)
2006	-33.2 C (-27.8 F)
2007	-28.2 C (-18.8 F)
2008	-31.6 C (-24.9 F)
2009	-28.2 C (-18.8 F)
2010	-26.0 C (-14.8 F)
2011	-28.8 C (-19.8 F)
2012	-23.8 C (-10.8 F)
2013	-26.1 C (-15.0 F)
2014	-30.5 C (-22.9 F)
2015	-27.1 C (-16.8 F)
2016	-30.5 C (-22.9 F)
2017	-31.6 C (-24.9 F)
2018	-28.2 C (-18.8 F)
2019	-25.5 C (-13.9 F)
2020	-24.3 C (-11.7 F)
2021	-26.0 C (-14.8 F)
2022	-34.9 C (-30.8 F)
2023	-35.0 C (-31.0 F)
2024	-32.7 C (-26.9 F)
2025	-28.2 C (-18.8 F)
2026	-24.4 C (-11.9 F)

Wettest day (Rx1day)

The wettest day of the year at Riverton, 1996 to 2026. The record is 67.1 mm (2.6 in) in 2017, marked on the chart; the median year is 23.9 mm (0.9 in).

Wettest day (Rx1day) at Riverton by year
Year	Wettest day (Rx1day)
1996	n/a
1997	n/a
1998	25.4 mm (1.0 in)
1999	19.3 mm (0.8 in)
2000	28.4 mm (1.1 in)
2001	15.5 mm (0.6 in)
2002	15.7 mm (0.6 in)
2003	23.9 mm (0.9 in)
2004	18.3 mm (0.7 in)
2005	23.4 mm (0.9 in)
2006	24.9 mm (1.0 in)
2007	23.9 mm (0.9 in)
2008	50.8 mm (2.0 in)
2009	26.7 mm (1.1 in)
2010	38.1 mm (1.5 in)
2011	48.5 mm (1.9 in)
2012	10.7 mm (0.4 in)
2013	17.3 mm (0.7 in)
2014	0.0 mm (0.00 in)
2015	26.9 mm (1.1 in)
2016	35.8 mm (1.4 in)
2017	67.1 mm (2.6 in)
2018	26.4 mm (1.0 in)
2019	41.4 mm (1.6 in)
2020	12.2 mm (0.5 in)
2021	19.8 mm (0.8 in)
2022	20.1 mm (0.8 in)
2023	28.2 mm (1.1 in)
2024	12.7 mm (0.5 in)
2025	23.1 mm (0.9 in)
2026	19.6 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Riverton, 1996 to 2026. The record is 104.6 mm (4.1 in) in 2008, marked on the chart; the median year is 38.0 mm (1.5 in).

Wettest five days (Rx5day) at Riverton by year
Year	Wettest five days (Rx5day)
1996	n/a
1997	n/a
1998	40.6 mm (1.6 in)
1999	43.2 mm (1.7 in)
2000	28.4 mm (1.1 in)
2001	21.1 mm (0.8 in)
2002	19.5 mm (0.8 in)
2003	44.0 mm (1.7 in)
2004	36.9 mm (1.5 in)
2005	44.4 mm (1.7 in)
2006	25.4 mm (1.0 in)
2007	30.8 mm (1.2 in)
2008	104.6 mm (4.1 in)
2009	36.6 mm (1.4 in)
2010	59.4 mm (2.3 in)
2011	67.8 mm (2.7 in)
2012	17.6 mm (0.7 in)
2013	21.6 mm (0.9 in)
2014	n/a
2015	55.4 mm (2.2 in)
2016	55.1 mm (2.2 in)
2017	79.6 mm (3.1 in)
2018	27.7 mm (1.1 in)
2019	53.3 mm (2.1 in)
2020	18.3 mm (0.7 in)
2021	24.1 mm (0.9 in)
2022	39.1 mm (1.5 in)
2023	52.3 mm (2.1 in)
2024	20.3 mm (0.8 in)
2025	25.1 mm (1.0 in)
2026	39.0 mm (1.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Riverton, 1996 to 2026. The record is 75 days in 2012, marked on the chart; the median year is 43 days.

Longest dry spell (CDD) at Riverton by year
Year	Longest dry spell (CDD)
1996	n/a
1997	n/a
1998	55 days
1999	48 days
2000	37 days
2001	53 days
2002	43 days
2003	49 days
2004	32 days
2005	70 days
2006	52 days
2007	65 days
2008	69 days
2009	41 days
2010	38 days
2011	29 days
2012	75 days
2013	21 days
2014	1 day
2015	75 days
2016	37 days
2017	33 days
2018	35 days
2019	65 days
2020	73 days
2021	37 days
2022	40 days
2023	37 days
2024	51 days
2025	47 days
2026	39 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

27 years with a frost

Across 27 years with a frost, the median last spring frost at Riverton falls on 17 May and the median first autumn frost on 2 October, which leaves a median of 133 days between them.

Fitted over all years, the growing season changes by +4.7 days per decade at this station.

Frost dates and growing season at Riverton
Measure	Median, all years	Earliest period	Recent period (1997 to 2025)	Recent against earliest	Fitted trend
Last spring frost	17 May	n/a	17 May	n/a	-1.4 days per decade
First autumn frost	2 October	n/a	2 October	n/a	+3.3 days per decade
Growing days	133 days	n/a	133 days	n/a	+4.7 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.

Download the Data

Data for Riverton standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Riverton 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).