Jerome Co AP Weather Records (USW00004110)

Record envelope, standing records and threshold days for Jerome Co AP (USW00004110), Idaho, United States, with 30 years of record.

Key Facts for Jerome Co AP

Jerome Co AP (USW00004110) is a weather station in Idaho, United States at 42.73 latitude and -114.45 longitude, 1,227 m (4,024 ft) above sea level.
The station reports from 1997 to 2026, 30 years of record.
1,464 records set at Jerome Co AP still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Idaho, United States, 42.73 latitude, -114.45 longitude.
Elevation: 1,227 m (4,024 ft).
Period of record: 1997 to 2026, 30 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 Jerome Co 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 Jerome Co AP, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.1 C (61.0 F)	-22.7 C (-8.9 F)	5.6 C (42.1 F)	-14.3 C (6.3 F)
Feb	16.7 C (62.1 F)	-18.9 C (-2.0 F)	11.1 C (52.0 F)	-13.2 C (8.2 F)
Mar	25.6 C (78.1 F)	-12.8 C (9.0 F)	25.6 C (78.1 F)	-4.3 C (24.3 F)
Apr	31.1 C (88.0 F)	-7.7 C (18.1 F)	27.2 C (81.0 F)	-3.2 C (26.2 F)
May	37.2 C (99.0 F)	-4.3 C (24.3 F)	33.3 C (91.9 F)	1.1 C (34.0 F)
Jun	39.4 C (102.9 F)	0.0 C (32.0 F)	34.4 C (93.9 F)	3.9 C (39.0 F)
Jul	40.6 C (105.1 F)	3.9 C (39.0 F)	36.7 C (98.1 F)	11.7 C (53.1 F)
Aug	38.9 C (102.0 F)	0.0 C (32.0 F)	36.7 C (98.1 F)	9.4 C (48.9 F)
Sep	38.9 C (102.0 F)	-2.2 C (28.0 F)	35.0 C (95.0 F)	5.6 C (42.1 F)
Oct	31.7 C (89.1 F)	-13.2 C (8.2 F)	28.3 C (82.9 F)	-3.9 C (25.0 F)
Nov	24.4 C (75.9 F)	-20.5 C (-4.9 F)	20.6 C (69.1 F)	-5.6 C (21.9 F)
Dec	15.6 C (60.1 F)	-22.1 C (-7.8 F)	15.6 C (60.1 F)	-8.3 C (17.1 F)

Which Years Hold Standing Records

1,464 standing records

1,464 records at Jerome Co AP still stand. 1999 holds the most, with 77.

Standing records at Jerome Co AP by the year they were set
Year set	Standing records
1997	40
1998	40
1999	77
2000	44
2001	45
2002	74
2003	71
2004	48
2005	45
2006	52
2007	43
2008	52
2009	41
2010	52
2011	40
2012	46
2013	58
2014	60
2015	76
2016	55
2017	51
2018	44
2019	30
2020	50
2021	49
2022	57
2023	33
2024	39
2025	52

Wettest Day of Each Month

Apr: 52.8 mm (2.1 in)

The wettest day on record for each calendar month at Jerome Co AP. The most was 52.8 mm (2.1 in) on 8 April 2009.

Record daily precipitation for each month at Jerome Co AP
Month	Record daily precipitation (mm)	Date
Jan	20.6 mm (0.8 in)	21 January 2012
Feb	18.0 mm (0.7 in)	2 February 2025
Mar	18.0 mm (0.7 in)	6 March 2002
Apr	52.8 mm (2.1 in)	8 April 2009
May	26.9 mm (1.1 in)	10 May 1998
Jun	24.9 mm (1.0 in)	20 June 2009
Jul	5.6 mm (0.22 in)	4 July 2025
Aug	50.0 mm (2.0 in)	6 August 2014
Sep	24.1 mm (0.9 in)	22 September 2023
Oct	34.3 mm (1.4 in)	24 October 2010
Nov	23.9 mm (0.9 in)	13 November 2006
Dec	31.2 mm (1.2 in)	8 December 2004

Period of Record Coverage

1997 to 2025

29 years of record at Jerome Co AP, 1997 to 2025. 3 years have data for under 90 percent of days and are left out of rankings: 1997, 1998, 2001.

Days with data per year at Jerome Co AP
Year	Days with data	Share of year	Complete
1997	310	85%	No
1998	311	85%	No
1999	363	99%	Yes
2000	342	93%	Yes
2001	313	86%	No
2002	355	97%	Yes
2003	358	98%	Yes
2004	363	99%	Yes
2005	365	100%	Yes
2006	357	98%	Yes
2007	361	99%	Yes
2008	366	100%	Yes
2009	364	100%	Yes
2010	365	100%	Yes
2011	363	99%	Yes
2012	364	99%	Yes
2013	365	100%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	366	100%	Yes
2017	353	97%	Yes
2018	365	100%	Yes
2019	364	100%	Yes
2020	366	100%	Yes
2021	365	100%	Yes
2022	365	100%	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

26 complete years, 1999 to 2025

One stripe for each of 26 complete years at Jerome Co AP, 1999 to 2025. Blue stripes are years cooler than the station's own mean of 9.8 C (49.6 F); red stripes are warmer. The coolest year was 2002, at 8.5 C (47.3 F), and the warmest was 2021, at 11.3 C (52.3 F). The strongest colour marks a difference of 1.5 C (2.7 F).

Annual mean temperature at Jerome Co AP as warming stripes, 1999 to 2025
Year	Annual mean temperature	Difference from the station mean
1999	9.3 C	-0.50 C
2000	9.6 C	-0.19 C
2002	8.5 C	-1.27 C
2003	10.4 C	+0.61 C
2004	9.2 C	-0.61 C
2005	9.1 C	-0.71 C
2006	9.6 C	-0.16 C
2007	9.8 C	+0.06 C
2008	8.6 C	-1.21 C
2009	8.6 C	-1.15 C
2010	9.0 C	-0.77 C
2011	8.7 C	-1.11 C
2012	10.6 C	+0.85 C
2013	9.3 C	-0.53 C
2014	10.5 C	+0.71 C
2015	10.8 C	+1.02 C
2016	10.1 C	+0.36 C
2017	9.8 C	-0.02 C
2018	10.5 C	+0.75 C
2019	9.6 C	-0.17 C
2020	10.8 C	+0.97 C
2021	11.3 C	+1.48 C
2022	9.3 C	-0.49 C
2023	9.7 C	-0.09 C
2024	10.7 C	+0.91 C
2025	11.1 C	+1.35 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

1997 to 2026

Yearly extremes at Jerome Co AP: 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)	2002	38.1 C (100.5 F)	30
Coldest night (TNn)	-22.7 C (-8.9 F)	2017	-17.4 C (0.6 F)	30
Wettest day (Rx1day)	52.8 mm (2.1 in)	2009	19.8 mm (0.8 in)	29
Wettest five days (Rx5day)	71.4 mm (2.8 in)	2012	32.8 mm (1.3 in)	29
Longest dry spell (CDD)	108 days	2018	56 days	29

Hottest day (TXx)

The hottest day of the year at Jerome Co AP, 1997 to 2026. The record is 40.6 C (105.1 F) in 2002, marked on the chart; the median year is 38.1 C (100.5 F).

Hottest day (TXx) at Jerome Co AP by year
Year	Hottest day (TXx)
1997	37.2 C (99.0 F)
1998	40.0 C (104.0 F)
1999	36.1 C (97.0 F)
2000	36.7 C (98.1 F)
2001	37.2 C (99.0 F)
2002	40.6 C (105.1 F)
2003	39.4 C (102.9 F)
2004	36.1 C (97.0 F)
2005	37.2 C (99.0 F)
2006	38.9 C (102.0 F)
2007	39.4 C (102.9 F)
2008	38.3 C (100.9 F)
2009	37.8 C (100.0 F)
2010	36.7 C (98.1 F)
2011	36.1 C (97.0 F)
2012	38.3 C (100.9 F)
2013	39.4 C (102.9 F)
2014	38.9 C (102.0 F)
2015	39.4 C (102.9 F)
2016	37.2 C (99.0 F)
2017	37.8 C (100.0 F)
2018	38.9 C (102.0 F)
2019	36.7 C (98.1 F)
2020	38.9 C (102.0 F)
2021	37.8 C (100.0 F)
2022	38.9 C (102.0 F)
2023	37.8 C (100.0 F)
2024	39.4 C (102.9 F)
2025	36.7 C (98.1 F)
2026	38.3 C (100.9 F)

Coldest night (TNn)

The coldest night of the year at Jerome Co AP, 1997 to 2026. The record is -22.7 C (-8.9 F) in 2017, marked on the chart; the median year is -17.4 C (0.6 F).

Coldest night (TNn) at Jerome Co AP by year
Year	Coldest night (TNn)
1997	-13.3 C (8.1 F)
1998	-20.6 C (-5.1 F)
1999	-15.0 C (5.0 F)
2000	-12.8 C (9.0 F)
2001	-16.1 C (3.0 F)
2002	-20.0 C (-4.0 F)
2003	-11.7 C (10.9 F)
2004	-20.6 C (-5.1 F)
2005	-17.2 C (1.0 F)
2006	-14.3 C (6.3 F)
2007	-17.7 C (0.1 F)
2008	-18.8 C (-1.8 F)
2009	-21.0 C (-5.8 F)
2010	-19.9 C (-3.8 F)
2011	-18.8 C (-1.8 F)
2012	-14.9 C (5.2 F)
2013	-22.1 C (-7.8 F)
2014	-17.1 C (1.2 F)
2015	-20.5 C (-4.9 F)
2016	-21.6 C (-6.9 F)
2017	-22.7 C (-8.9 F)
2018	-13.2 C (8.2 F)
2019	-13.8 C (7.2 F)
2020	-11.6 C (11.1 F)
2021	-11.0 C (12.2 F)
2022	-19.3 C (-2.7 F)
2023	-19.9 C (-3.8 F)
2024	-18.8 C (-1.8 F)
2025	-14.3 C (6.3 F)
2026	-8.9 C (16.0 F)

Wettest day (Rx1day)

The wettest day of the year at Jerome Co AP, 1997 to 2026. The record is 52.8 mm (2.1 in) in 2009, marked on the chart; the median year is 19.8 mm (0.8 in).

Wettest day (Rx1day) at Jerome Co AP by year
Year	Wettest day (Rx1day)
1997	n/a
1998	26.9 mm (1.1 in)
1999	20.1 mm (0.8 in)
2000	10.4 mm (0.4 in)
2001	23.1 mm (0.9 in)
2002	18.0 mm (0.7 in)
2003	20.8 mm (0.8 in)
2004	31.2 mm (1.2 in)
2005	23.6 mm (0.9 in)
2006	23.9 mm (0.9 in)
2007	15.7 mm (0.6 in)
2008	19.8 mm (0.8 in)
2009	52.8 mm (2.1 in)
2010	34.3 mm (1.4 in)
2011	14.7 mm (0.6 in)
2012	20.8 mm (0.8 in)
2013	9.7 mm (0.38 in)
2014	50.0 mm (2.0 in)
2015	25.7 mm (1.0 in)
2016	20.8 mm (0.8 in)
2017	11.9 mm (0.5 in)
2018	19.3 mm (0.8 in)
2019	15.5 mm (0.6 in)
2020	17.0 mm (0.7 in)
2021	16.5 mm (0.6 in)
2022	15.7 mm (0.6 in)
2023	24.1 mm (0.9 in)
2024	14.7 mm (0.6 in)
2025	18.0 mm (0.7 in)
2026	17.3 mm (0.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Jerome Co AP, 1997 to 2026. The record is 71.4 mm (2.8 in) in 2012, marked on the chart; the median year is 32.8 mm (1.3 in).

Wettest five days (Rx5day) at Jerome Co AP by year
Year	Wettest five days (Rx5day)
1997	n/a
1998	69.6 mm (2.7 in)
1999	41.2 mm (1.6 in)
2000	19.2 mm (0.8 in)
2001	34.1 mm (1.3 in)
2002	21.6 mm (0.9 in)
2003	34.3 mm (1.4 in)
2004	49.2 mm (1.9 in)
2005	49.2 mm (1.9 in)
2006	45.9 mm (1.8 in)
2007	22.8 mm (0.9 in)
2008	25.6 mm (1.0 in)
2009	59.4 mm (2.3 in)
2010	37.4 mm (1.5 in)
2011	22.3 mm (0.9 in)
2012	71.4 mm (2.8 in)
2013	12.2 mm (0.5 in)
2014	61.2 mm (2.4 in)
2015	42.5 mm (1.7 in)
2016	39.8 mm (1.6 in)
2017	25.2 mm (1.0 in)
2018	22.9 mm (0.9 in)
2019	26.9 mm (1.1 in)
2020	24.6 mm (1.0 in)
2021	32.8 mm (1.3 in)
2022	26.9 mm (1.1 in)
2023	24.1 mm (0.9 in)
2024	37.3 mm (1.5 in)
2025	27.5 mm (1.1 in)
2026	18.6 mm (0.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Jerome Co AP, 1997 to 2026. The record is 108 days in 2018, marked on the chart; the median year is 56 days.

Longest dry spell (CDD) at Jerome Co AP by year
Year	Longest dry spell (CDD)
1997	n/a
1998	78 days
1999	59 days
2000	42 days
2001	85 days
2002	32 days
2003	51 days
2004	33 days
2005	34 days
2006	73 days
2007	104 days
2008	59 days
2009	36 days
2010	54 days
2011	80 days
2012	71 days
2013	84 days
2014	47 days
2015	47 days
2016	85 days
2017	92 days
2018	108 days
2019	47 days
2020	56 days
2021	69 days
2022	53 days
2023	67 days
2024	51 days
2025	51 days
2026	33 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

26 years with a frost

Across 26 years with a frost, the median last spring frost at Jerome Co AP falls on 7 May and the median first autumn frost on 8 October, which leaves a median of 150 days between them.

Fitted over all years, the growing season changes by +18.6 days per decade at this station.

Frost dates and growing season at Jerome Co AP
Measure	Median, all years	Earliest period	Recent period (1999 to 2025)	Recent against earliest	Fitted trend
Last spring frost	7 May	n/a	7 May	n/a	-5.9 days per decade
First autumn frost	8 October	n/a	8 October	n/a	+12.7 days per decade
Growing days	150 days	n/a	150 days	n/a	+18.6 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 Jerome Co AP standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Jerome Co 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 2026-10-13 (13 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).