Pasco Tri Cities AP Weather Records (USW00024163)

Record envelope, standing records and threshold days for Pasco Tri Cities AP (USW00024163), Washington, United States, with 82 years of record.

Key Facts for Pasco Tri Cities AP

Pasco Tri Cities AP (USW00024163) is a weather station in Washington, United States at 46.27 latitude and -119.12 longitude, 122 m (400 ft) above sea level.
The station reports from 1945 to 2026, 82 years of record.
1,464 records set at Pasco Tri Cities AP still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Washington, United States, 46.27 latitude, -119.12 longitude.
Elevation: 122 m (400 ft).
Period of record: 1945 to 2026, 82 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

26 days at or beyond a record

The band shows the record high and record low for each calendar day at Pasco Tri Cities AP. The lines show the 2026 daily maximum and minimum. 26 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Pasco Tri Cities AP, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	19.4 C (66.9 F)	-28.3 C (-18.9 F)	12.8 C (55.0 F)	-10.5 C (13.1 F)
Feb	20.6 C (69.1 F)	-18.8 C (-1.8 F)	16.7 C (62.1 F)	-15.5 C (4.1 F)
Mar	26.7 C (80.1 F)	-18.2 C (-0.8 F)	26.1 C (79.0 F)	-4.3 C (24.3 F)
Apr	34.4 C (93.9 F)	-6.0 C (21.2 F)	27.2 C (81.0 F)	-2.1 C (28.2 F)
May	38.3 C (100.9 F)	-2.2 C (28.0 F)	35.0 C (95.0 F)	1.1 C (34.0 F)
Jun	46.1 C (115.0 F)	2.8 C (37.0 F)	39.4 C (102.9 F)	6.7 C (44.1 F)
Jul	44.4 C (111.9 F)	5.6 C (42.1 F)	40.0 C (104.0 F)	11.1 C (52.0 F)
Aug	43.9 C (111.0 F)	4.4 C (39.9 F)	38.9 C (102.0 F)	11.1 C (52.0 F)
Sep	38.9 C (102.0 F)	-3.3 C (26.1 F)	37.2 C (99.0 F)	5.0 C (41.0 F)
Oct	32.2 C (90.0 F)	-12.8 C (9.0 F)	26.1 C (79.0 F)	-2.2 C (28.0 F)
Nov	25.0 C (77.0 F)	-21.6 C (-6.9 F)	22.8 C (73.0 F)	-5.0 C (23.0 F)
Dec	21.7 C (71.1 F)	-22.7 C (-8.9 F)	20.6 C (69.1 F)	-7.2 C (19.0 F)

Which Years Hold Standing Records

1,464 standing records

1,464 records at Pasco Tri Cities AP still stand. 2002 holds the most, with 76.

Standing records at Pasco Tri Cities AP by the year they were set
Year set	Standing records
1945	54
1946	11
1998	59
1999	70
2000	44
2001	42
2002	76
2003	56
2004	39
2005	34
2006	45
2007	46
2008	56
2009	39
2010	43
2011	51
2012	43
2013	51
2014	65
2015	47
2016	50
2017	37
2018	27
2019	73
2020	60
2021	72
2022	52
2023	36
2024	41
2025	45

Wettest Day of Each Month

Jun: 27.9 mm (1.1 in)

The wettest day on record for each calendar month at Pasco Tri Cities AP. The most was 27.9 mm (1.1 in) on 1 June 2011.

Record daily precipitation for each month at Pasco Tri Cities AP
Month	Record daily precipitation (mm)	Date
Jan	16.8 mm (0.7 in)	2 January 2009
Feb	14.0 mm (0.6 in)	23 February 2002
Mar	11.4 mm (0.4 in)	24 March 2017
Apr	13.7 mm (0.5 in)	30 April 2022
May	19.0 mm (0.7 in)	17 May 2025
Jun	27.9 mm (1.1 in)	1 June 2011
Jul	12.7 mm (0.5 in)	16 July 2012
Aug	11.4 mm (0.4 in)	14 August 2014
Sep	18.3 mm (0.7 in)	30 September 2005
Oct	22.4 mm (0.9 in)	30 October 2016
Nov	20.8 mm (0.8 in)	5 November 1998
Dec	18.5 mm (0.7 in)	13 December 2003

Period of Record Coverage

1945 to 2025

30 years of record at Pasco Tri Cities AP, 1945 to 2025. 2 years have data for under 90 percent of days and are left out of rankings: 1945, 1946.

Days with data per year at Pasco Tri Cities AP
Year	Days with data	Share of year	Complete
1945	272	75%	No
1946	151	41%	No
1998	331	91%	Yes
1999	364	100%	Yes
2000	359	98%	Yes
2001	362	99%	Yes
2002	364	100%	Yes
2003	364	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	364	100%	Yes
2007	362	99%	Yes
2008	365	100%	Yes
2009	363	99%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	365	100%	Yes
2013	365	100%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	366	100%	Yes
2017	364	100%	Yes
2018	364	100%	Yes
2019	365	100%	Yes
2020	366	100%	Yes
2021	365	100%	Yes
2022	362	99%	Yes
2023	365	100%	Yes
2024	366	100%	Yes
2025	365	100%	Yes

Latest Records

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

Climate Trend

27 complete years, 1999 to 2025

One stripe for each of 27 complete years at Pasco Tri Cities AP, 1999 to 2025. Blue stripes are years cooler than the station's own mean of 12.1 C (53.8 F); red stripes are warmer. The coolest year was 2008, at 11.1 C (52.0 F), and the warmest was 2021, at 13.4 C (56.0 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Pasco Tri Cities AP as warming stripes, 1999 to 2025
Year	Annual mean temperature	Difference from the station mean
1999	11.9 C	-0.15 C
2000	11.3 C	-0.76 C
2001	11.7 C	-0.40 C
2002	11.6 C	-0.48 C
2003	12.7 C	+0.63 C
2004	12.3 C	+0.21 C
2005	11.9 C	-0.22 C
2006	12.2 C	+0.08 C
2007	11.8 C	-0.33 C
2008	11.1 C	-1.00 C
2009	11.2 C	-0.86 C
2010	11.8 C	-0.28 C
2011	11.2 C	-0.89 C
2012	12.2 C	+0.06 C
2013	11.6 C	-0.50 C
2014	12.6 C	+0.46 C
2015	13.1 C	+1.04 C
2016	12.6 C	+0.55 C
2017	11.2 C	-0.86 C
2018	12.4 C	+0.27 C
2019	11.4 C	-0.72 C
2020	13.0 C	+0.94 C
2021	13.4 C	+1.26 C
2022	12.0 C	-0.07 C
2023	12.6 C	+0.55 C
2024	12.8 C	+0.66 C
2025	12.8 C	+0.72 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

1945 to 2026

Yearly extremes at Pasco Tri Cities AP: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	46.1 C (115.0 F)	2021	41.1 C (106.0 F)	31
Coldest night (TNn)	-28.3 C (-18.9 F)	2004	-14.9 C (5.2 F)	31
Wettest day (Rx1day)	27.9 mm (1.1 in)	2011	15.0 mm (0.6 in)	31
Wettest five days (Rx5day)	40.4 mm (1.6 in)	2005	22.7 mm (0.9 in)	31
Longest dry spell (CDD)	108 days	2018	57 days	31

Hottest day (TXx)

The hottest day of the year at Pasco Tri Cities AP, 1945 to 2026. The record is 46.1 C (115.0 F) in 2021, marked on the chart; the median year is 41.1 C (106.0 F).

Hottest day (TXx) at Pasco Tri Cities AP by year
Year	Hottest day (TXx)
1945	41.1 C (106.0 F)
1946	33.3 C (91.9 F)
1998	43.9 C (111.0 F)
1999	39.4 C (102.9 F)
2000	41.1 C (106.0 F)
2001	40.6 C (105.1 F)
2002	42.8 C (109.0 F)
2003	41.7 C (107.1 F)
2004	40.0 C (104.0 F)
2005	40.0 C (104.0 F)
2006	44.4 C (111.9 F)
2007	40.6 C (105.1 F)
2008	40.6 C (105.1 F)
2009	42.8 C (109.0 F)
2010	40.0 C (104.0 F)
2011	37.2 C (99.0 F)
2012	41.7 C (107.1 F)
2013	41.7 C (107.1 F)
2014	42.8 C (109.0 F)
2015	43.9 C (111.0 F)
2016	40.6 C (105.1 F)
2017	41.1 C (106.0 F)
2018	41.7 C (107.1 F)
2019	39.4 C (102.9 F)
2020	43.9 C (111.0 F)
2021	46.1 C (115.0 F)
2022	44.4 C (111.9 F)
2023	42.8 C (109.0 F)
2024	42.8 C (109.0 F)
2025	40.0 C (104.0 F)
2026	38.9 C (102.0 F)

Coldest night (TNn)

The coldest night of the year at Pasco Tri Cities AP, 1945 to 2026. The record is -28.3 C (-18.9 F) in 2004, marked on the chart; the median year is -14.9 C (5.2 F).

Coldest night (TNn) at Pasco Tri Cities AP by year
Year	Coldest night (TNn)
1945	-12.8 C (9.0 F)
1946	-7.8 C (18.0 F)
1998	-18.9 C (-2.0 F)
1999	-6.7 C (19.9 F)
2000	-11.7 C (10.9 F)
2001	-10.0 C (14.0 F)
2002	-12.8 C (9.0 F)
2003	-16.7 C (1.9 F)
2004	-28.3 C (-18.9 F)
2005	-15.0 C (5.0 F)
2006	-14.9 C (5.2 F)
2007	-14.9 C (5.2 F)
2008	-21.0 C (-5.8 F)
2009	-18.8 C (-1.8 F)
2010	-21.6 C (-6.9 F)
2011	-13.8 C (7.2 F)
2012	-12.1 C (10.2 F)
2013	-16.6 C (2.1 F)
2014	-14.3 C (6.3 F)
2015	-11.6 C (11.1 F)
2016	-22.7 C (-8.9 F)
2017	-22.1 C (-7.8 F)
2018	-11.6 C (11.1 F)
2019	-18.8 C (-1.8 F)
2020	-13.2 C (8.2 F)
2021	-20.5 C (-4.9 F)
2022	-21.6 C (-6.9 F)
2023	-13.2 C (8.2 F)
2024	-16.6 C (2.1 F)
2025	-15.5 C (4.1 F)
2026	-10.6 C (12.9 F)

Wettest day (Rx1day)

The wettest day of the year at Pasco Tri Cities AP, 1945 to 2026. The record is 27.9 mm (1.1 in) in 2011, marked on the chart; the median year is 15.0 mm (0.6 in).

Wettest day (Rx1day) at Pasco Tri Cities AP by year
Year	Wettest day (Rx1day)
1945	12.4 mm (0.5 in)
1946	6.6 mm (0.26 in)
1998	20.8 mm (0.8 in)
1999	9.1 mm (0.36 in)
2000	17.0 mm (0.7 in)
2001	10.7 mm (0.4 in)
2002	14.0 mm (0.6 in)
2003	18.5 mm (0.7 in)
2004	15.0 mm (0.6 in)
2005	18.3 mm (0.7 in)
2006	14.0 mm (0.6 in)
2007	10.9 mm (0.4 in)
2008	16.3 mm (0.6 in)
2009	16.8 mm (0.7 in)
2010	13.5 mm (0.5 in)
2011	27.9 mm (1.1 in)
2012	16.0 mm (0.6 in)
2013	12.2 mm (0.5 in)
2014	11.7 mm (0.5 in)
2015	15.7 mm (0.6 in)
2016	22.4 mm (0.9 in)
2017	11.4 mm (0.4 in)
2018	12.7 mm (0.5 in)
2019	12.7 mm (0.5 in)
2020	16.3 mm (0.6 in)
2021	17.5 mm (0.7 in)
2022	15.0 mm (0.6 in)
2023	8.6 mm (0.34 in)
2024	17.8 mm (0.7 in)
2025	19.0 mm (0.7 in)
2026	12.7 mm (0.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Pasco Tri Cities AP, 1945 to 2026. The record is 40.4 mm (1.6 in) in 2005, marked on the chart; the median year is 22.7 mm (0.9 in).

Wettest five days (Rx5day) at Pasco Tri Cities AP by year
Year	Wettest five days (Rx5day)
1945	19.9 mm (0.8 in)
1946	10.7 mm (0.4 in)
1998	26.9 mm (1.1 in)
1999	13.4 mm (0.5 in)
2000	17.3 mm (0.7 in)
2001	18.4 mm (0.7 in)
2002	29.6 mm (1.2 in)
2003	25.4 mm (1.0 in)
2004	29.5 mm (1.2 in)
2005	40.4 mm (1.6 in)
2006	34.3 mm (1.4 in)
2007	17.5 mm (0.7 in)
2008	22.9 mm (0.9 in)
2009	30.0 mm (1.2 in)
2010	22.1 mm (0.9 in)
2011	33.9 mm (1.3 in)
2012	24.2 mm (1.0 in)
2013	17.6 mm (0.7 in)
2014	16.0 mm (0.6 in)
2015	28.2 mm (1.1 in)
2016	27.2 mm (1.1 in)
2017	17.5 mm (0.7 in)
2018	17.7 mm (0.7 in)
2019	26.9 mm (1.1 in)
2020	22.7 mm (0.9 in)
2021	21.9 mm (0.9 in)
2022	24.1 mm (0.9 in)
2023	17.1 mm (0.7 in)
2024	30.4 mm (1.2 in)
2025	20.2 mm (0.8 in)
2026	18.6 mm (0.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Pasco Tri Cities AP, 1945 to 2026. The record is 108 days in 2018, marked on the chart; the median year is 57 days.

Longest dry spell (CDD) at Pasco Tri Cities AP by year
Year	Longest dry spell (CDD)
1945	70 days
1946	28 days
1998	48 days
1999	59 days
2000	81 days
2001	47 days
2002	44 days
2003	105 days
2004	39 days
2005	43 days
2006	96 days
2007	57 days
2008	57 days
2009	32 days
2010	30 days
2011	67 days
2012	44 days
2013	34 days
2014	61 days
2015	102 days
2016	30 days
2017	47 days
2018	108 days
2019	47 days
2020	53 days
2021	86 days
2022	75 days
2023	80 days
2024	62 days
2025	90 days
2026	37 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 Pasco Tri Cities AP falls on 1 May and the median first autumn frost on 12 October, which leaves a median of 167 days between them.

Fitted over all years, the growing season changes by +9.3 days per decade at this station.

Frost dates and growing season at Pasco Tri Cities AP
Measure	Median, all years	Earliest period	Recent period (1999 to 2025)	Recent against earliest	Fitted trend
Last spring frost	1 May	n/a	1 May	n/a	-4.8 days per decade
First autumn frost	12 October	n/a	12 October	n/a	+4.5 days per decade
Growing days	167 days	n/a	167 days	n/a	+9.3 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 Pasco Tri Cities AP standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Pasco Tri Cities AP 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).