Valparaiso Porter Co Muni AP Weather Records (USW00004846)

Record envelope, standing records and threshold days for Valparaiso Porter Co Muni AP (USW00004846), Indiana, United States, with 30 years of record.

Key Facts for Valparaiso Porter Co Muni AP

Valparaiso Porter Co Muni AP (USW00004846) is a weather station in Indiana, United States at 41.45 latitude and -87.00 longitude, 234 m (768 ft) above sea level.
The station reports from 1997 to 2026, 30 years of record.
1,464 records set at Valparaiso Porter Co Muni AP still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Indiana, United States, 41.45 latitude, -87.00 longitude.
Elevation: 234 m (768 ft).
Period of record: 1997 to 2026, 30 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

29 days at or beyond a record

The band shows the record high and record low for each calendar day at Valparaiso Porter Co Muni AP. The lines show the 2026 daily maximum and minimum. 29 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Valparaiso Porter Co Muni AP, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	18.3 C (64.9 F)	-28.9 C (-20.0 F)	8.3 C (46.9 F)	-21.6 C (-6.9 F)
Feb	21.7 C (71.1 F)	-25.5 C (-13.9 F)	15.0 C (59.0 F)	-19.9 C (-3.8 F)
Mar	30.0 C (86.0 F)	-20.6 C (-5.1 F)	26.1 C (79.0 F)	-9.9 C (14.2 F)
Apr	31.1 C (88.0 F)	-7.7 C (18.1 F)	28.3 C (82.9 F)	-4.3 C (24.3 F)
May	36.7 C (98.1 F)	-3.2 C (26.2 F)	32.8 C (91.0 F)	2.8 C (37.0 F)
Jun	37.8 C (100.0 F)	3.3 C (37.9 F)	35.0 C (95.0 F)	5.0 C (41.0 F)
Jul	38.3 C (100.9 F)	6.1 C (43.0 F)	35.0 C (95.0 F)	15.6 C (60.1 F)
Aug	35.6 C (96.1 F)	6.1 C (43.0 F)	33.9 C (93.0 F)	9.4 C (48.9 F)
Sep	36.1 C (97.0 F)	2.2 C (36.0 F)	32.2 C (90.0 F)	5.0 C (41.0 F)
Oct	32.8 C (91.0 F)	-4.3 C (24.3 F)	31.7 C (89.1 F)	-0.6 C (30.9 F)
Nov	26.1 C (79.0 F)	-14.3 C (6.3 F)	18.9 C (66.0 F)	-7.2 C (19.0 F)
Dec	20.6 C (69.1 F)	-24.9 C (-12.8 F)	17.8 C (64.0 F)	-18.9 C (-2.0 F)

Which Years Hold Standing Records

1,464 standing records

1,464 records at Valparaiso Porter Co Muni AP still stand. 2014 holds the most, with 88.

Standing records at Valparaiso Porter Co Muni AP by the year they were set
Year set	Standing records
1998	53
1999	60
2000	58
2001	54
2002	56
2003	43
2004	59
2005	42
2006	47
2007	62
2008	42
2009	54
2010	39
2011	43
2012	74
2013	47
2014	88
2015	63
2016	44
2017	75
2018	57
2019	48
2020	36
2021	45
2022	38
2023	39
2024	54
2025	44

Wettest Day of Each Month

Sep: 97.0 mm (3.8 in)

The wettest day on record for each calendar month at Valparaiso Porter Co Muni AP. The most was 97.0 mm (3.8 in) on 27 September 2019.

Record daily precipitation for each month at Valparaiso Porter Co Muni AP
Month	Record daily precipitation (mm)	Date
Jan	37.8 mm (1.5 in)	10 January 2020
Feb	56.4 mm (2.2 in)	20 February 2018
Mar	42.9 mm (1.7 in)	4 March 2025
Apr	47.5 mm (1.9 in)	25 April 2007
May	60.2 mm (2.4 in)	12 May 2023
Jun	57.2 mm (2.3 in)	27 June 2019
Jul	91.4 mm (3.6 in)	1 July 2011
Aug	91.4 mm (3.6 in)	15 August 2016
Sep	97.0 mm (3.8 in)	27 September 2019
Oct	64.8 mm (2.6 in)	5 October 2023
Nov	33.8 mm (1.3 in)	5 November 2024
Dec	47.5 mm (1.9 in)	14 December 2011

Period of Record Coverage

1997 to 2025

29 years of record at Valparaiso Porter Co Muni AP, 1997 to 2025. 1 years have data for under 90 percent of days and are left out of rankings: 1997.

Days with data per year at Valparaiso Porter Co Muni AP
Year	Days with data	Share of year	Complete
1997	31	8%	No
1998	362	99%	Yes
1999	345	95%	Yes
2000	350	96%	Yes
2001	365	100%	Yes
2002	359	98%	Yes
2003	357	98%	Yes
2004	357	98%	Yes
2005	361	99%	Yes
2006	358	98%	Yes
2007	360	99%	Yes
2008	365	100%	Yes
2009	357	98%	Yes
2010	364	100%	Yes
2011	365	100%	Yes
2012	364	99%	Yes
2013	362	99%	Yes
2014	360	99%	Yes
2015	364	100%	Yes
2016	364	99%	Yes
2017	363	99%	Yes
2018	362	99%	Yes
2019	363	99%	Yes
2020	348	95%	Yes
2021	363	99%	Yes
2022	363	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, 1998 to 2025

One stripe for each of 27 complete years at Valparaiso Porter Co Muni AP, 1998 to 2025. Blue stripes are years cooler than the station's own mean of 10.4 C (50.7 F); red stripes are warmer. The coolest year was 2014, at 7.9 C (46.3 F), and the warmest was 2012, at 11.8 C (53.2 F). The strongest colour marks a difference of 2.5 C (4.5 F).

Annual mean temperature at Valparaiso Porter Co Muni AP as warming stripes, 1998 to 2025
Year	Annual mean temperature	Difference from the station mean
1998	11.4 C	+1.01 C
1999	10.4 C	-0.05 C
2001	10.4 C	+0.02 C
2002	10.5 C	+0.08 C
2003	9.2 C	-1.17 C
2004	9.7 C	-0.69 C
2005	10.3 C	-0.11 C
2006	10.7 C	+0.32 C
2007	10.3 C	-0.10 C
2008	9.2 C	-1.17 C
2009	9.2 C	-1.22 C
2010	10.3 C	-0.07 C
2011	10.1 C	-0.33 C
2012	11.8 C	+1.39 C
2013	9.4 C	-0.99 C
2014	7.9 C	-2.46 C
2015	10.0 C	-0.44 C
2016	11.3 C	+0.89 C
2017	11.8 C	+1.37 C
2018	11.0 C	+0.57 C
2019	10.7 C	+0.31 C
2020	10.6 C	+0.22 C
2021	11.0 C	+0.58 C
2022	10.0 C	-0.44 C
2023	11.2 C	+0.78 C
2024	11.8 C	+1.37 C
2025	10.7 C	+0.26 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 Valparaiso Porter Co Muni AP: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.3 C (100.9 F)	2011	35.0 C (95.0 F)	30
Coldest night (TNn)	-28.9 C (-20.0 F)	1999	-22.1 C (-7.9 F)	30
Wettest day (Rx1day)	97.0 mm (3.8 in)	2019	52.8 mm (2.1 in)	29
Wettest five days (Rx5day)	165.8 mm (6.5 in)	2016	82.9 mm (3.3 in)	29
Longest dry spell (CDD)	35 days	2017	20 days	29

Hottest day (TXx)

The hottest day of the year at Valparaiso Porter Co Muni AP, 1997 to 2026. The record is 38.3 C (100.9 F) in 2011, marked on the chart; the median year is 35.0 C (95.0 F).

Hottest day (TXx) at Valparaiso Porter Co Muni AP by year
Year	Hottest day (TXx)
1997	7.8 C (46.0 F)
1998	35.6 C (96.1 F)
1999	36.1 C (97.0 F)
2000	33.3 C (91.9 F)
2001	33.9 C (93.0 F)
2002	35.0 C (95.0 F)
2003	35.0 C (95.0 F)
2004	32.8 C (91.0 F)
2005	36.7 C (98.1 F)
2006	33.9 C (93.0 F)
2007	34.4 C (93.9 F)
2008	33.9 C (93.0 F)
2009	33.9 C (93.0 F)
2010	34.4 C (93.9 F)
2011	38.3 C (100.9 F)
2012	37.8 C (100.0 F)
2013	36.1 C (97.0 F)
2014	32.2 C (90.0 F)
2015	33.9 C (93.0 F)
2016	35.0 C (95.0 F)
2017	35.6 C (96.1 F)
2018	36.7 C (98.1 F)
2019	36.1 C (97.0 F)
2020	33.9 C (93.0 F)
2021	34.4 C (93.9 F)
2022	36.7 C (98.1 F)
2023	35.6 C (96.1 F)
2024	35.0 C (95.0 F)
2025	35.0 C (95.0 F)
2026	33.9 C (93.0 F)

Coldest night (TNn)

The coldest night of the year at Valparaiso Porter Co Muni AP, 1997 to 2026. The record is -28.9 C (-20.0 F) in 1999, marked on the chart; the median year is -22.1 C (-7.9 F).

Coldest night (TNn) at Valparaiso Porter Co Muni AP by year
Year	Coldest night (TNn)
1997	-13.9 C (7.0 F)
1998	-18.3 C (-0.9 F)
1999	-28.9 C (-20.0 F)
2000	-23.3 C (-9.9 F)
2001	-17.8 C (0.0 F)
2002	-20.6 C (-5.1 F)
2003	-22.2 C (-8.0 F)
2004	-23.3 C (-9.9 F)
2005	-22.8 C (-9.0 F)
2006	-18.8 C (-1.8 F)
2007	-23.2 C (-9.8 F)
2008	-22.1 C (-7.8 F)
2009	-28.8 C (-19.8 F)
2010	-21.6 C (-6.9 F)
2011	-24.9 C (-12.8 F)
2012	-16.0 C (3.2 F)
2013	-21.6 C (-6.9 F)
2014	-26.6 C (-15.9 F)
2015	-25.5 C (-13.9 F)
2016	-24.9 C (-12.8 F)
2017	-18.8 C (-1.8 F)
2018	-24.9 C (-12.8 F)
2019	-28.2 C (-18.8 F)
2020	-20.5 C (-4.9 F)
2021	-22.1 C (-7.8 F)
2022	-22.7 C (-8.9 F)
2023	-16.0 C (3.2 F)
2024	-23.2 C (-9.8 F)
2025	-21.6 C (-6.9 F)
2026	-20.6 C (-5.1 F)

Wettest day (Rx1day)

The wettest day of the year at Valparaiso Porter Co Muni AP, 1997 to 2026. The record is 97.0 mm (3.8 in) in 2019, marked on the chart; the median year is 52.8 mm (2.1 in).

Wettest day (Rx1day) at Valparaiso Porter Co Muni AP by year
Year	Wettest day (Rx1day)
1997	n/a
1998	38.1 mm (1.5 in)
1999	58.7 mm (2.3 in)
2000	52.8 mm (2.1 in)
2001	49.0 mm (1.9 in)
2002	38.9 mm (1.5 in)
2003	57.9 mm (2.3 in)
2004	32.3 mm (1.3 in)
2005	39.1 mm (1.5 in)
2006	41.4 mm (1.6 in)
2007	50.3 mm (2.0 in)
2008	68.6 mm (2.7 in)
2009	58.9 mm (2.3 in)
2010	46.7 mm (1.8 in)
2011	91.4 mm (3.6 in)
2012	29.5 mm (1.2 in)
2013	49.3 mm (1.9 in)
2014	74.2 mm (2.9 in)
2015	60.5 mm (2.4 in)
2016	91.4 mm (3.6 in)
2017	49.8 mm (2.0 in)
2018	56.4 mm (2.2 in)
2019	97.0 mm (3.8 in)
2020	48.5 mm (1.9 in)
2021	57.2 mm (2.3 in)
2022	63.2 mm (2.5 in)
2023	64.8 mm (2.6 in)
2024	61.0 mm (2.4 in)
2025	44.7 mm (1.8 in)
2026	41.9 mm (1.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Valparaiso Porter Co Muni AP, 1997 to 2026. The record is 165.8 mm (6.5 in) in 2016, marked on the chart; the median year is 82.9 mm (3.3 in).

Wettest five days (Rx5day) at Valparaiso Porter Co Muni AP by year
Year	Wettest five days (Rx5day)
1997	n/a
1998	39.1 mm (1.5 in)
1999	82.8 mm (3.3 in)
2000	97.1 mm (3.8 in)
2001	108.1 mm (4.3 in)
2002	82.9 mm (3.3 in)
2003	108.8 mm (4.3 in)
2004	81.1 mm (3.2 in)
2005	66.8 mm (2.6 in)
2006	78.2 mm (3.1 in)
2007	129.2 mm (5.1 in)
2008	71.2 mm (2.8 in)
2009	94.8 mm (3.7 in)
2010	74.0 mm (2.9 in)
2011	101.1 mm (4.0 in)
2012	59.7 mm (2.4 in)
2013	81.4 mm (3.2 in)
2014	133.3 mm (5.2 in)
2015	65.4 mm (2.6 in)
2016	165.8 mm (6.5 in)
2017	88.7 mm (3.5 in)
2018	108.5 mm (4.3 in)
2019	129.3 mm (5.1 in)
2020	95.0 mm (3.7 in)
2021	89.7 mm (3.5 in)
2022	67.8 mm (2.7 in)
2023	67.8 mm (2.7 in)
2024	74.5 mm (2.9 in)
2025	69.2 mm (2.7 in)
2026	87.1 mm (3.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Valparaiso Porter Co Muni AP, 1997 to 2026. The record is 35 days in 2017, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Valparaiso Porter Co Muni AP by year
Year	Longest dry spell (CDD)
1997	n/a
1998	19 days
1999	25 days
2000	19 days
2001	14 days
2002	17 days
2003	30 days
2004	17 days
2005	24 days
2006	28 days
2007	33 days
2008	20 days
2009	22 days
2010	16 days
2011	16 days
2012	19 days
2013	20 days
2014	13 days
2015	27 days
2016	21 days
2017	35 days
2018	16 days
2019	19 days
2020	15 days
2021	17 days
2022	18 days
2023	22 days
2024	21 days
2025	31 days
2026	23 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 Valparaiso Porter Co Muni AP falls on 26 April and the median first autumn frost on 21 October, which leaves a median of 181 days between them.

Fitted over all years, the growing season changes by +4.9 days per decade at this station.

Frost dates and growing season at Valparaiso Porter Co Muni AP
Measure	Median, all years	Earliest period	Recent period (1998 to 2025)	Recent against earliest	Fitted trend
Last spring frost	26 April	n/a	26 April	n/a	-2.2 days per decade
First autumn frost	21 October	n/a	21 October	n/a	+2.7 days per decade
Growing days	181 days	n/a	181 days	n/a	+4.9 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 Valparaiso Porter Co Muni AP standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Valparaiso Porter Co Muni 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 2026-10-14 (14 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).