Monmouth 4NW Weather Records (USC00115772)

Record envelope, standing records and threshold days for Monmouth 4NW (USC00115772), Illinois, United States, with 32 years of record.

Key Facts for Monmouth 4NW

Monmouth 4NW (USC00115772) is a weather station in Illinois, United States at 40.94 latitude and -90.72 longitude, 221 m (724 ft) above sea level.
The station reports from 1995 to 2026, 32 years of record.
1,464 records set at Monmouth 4NW still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Illinois, United States, 40.94 latitude, -90.72 longitude.
Elevation: 221 m (724 ft).
Period of record: 1995 to 2026, 32 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

38 days at or beyond a record

The band shows the record high and record low for each calendar day at Monmouth 4NW. The lines show the 2026 daily maximum and minimum. 38 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Monmouth 4NW, 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)	-30.6 C (-23.1 F)	12.8 C (55.0 F)	-25.6 C (-14.1 F)
Feb	25.6 C (78.1 F)	-31.7 C (-25.1 F)	16.7 C (62.1 F)	-20.6 C (-5.1 F)
Mar	28.9 C (84.0 F)	-24.4 C (-11.9 F)	27.8 C (82.0 F)	-10.0 C (14.0 F)
Apr	32.2 C (90.0 F)	-10.6 C (12.9 F)	30.6 C (87.1 F)	-5.0 C (23.0 F)
May	37.2 C (99.0 F)	-2.2 C (28.0 F)	33.3 C (91.9 F)	3.9 C (39.0 F)
Jun	35.6 C (96.1 F)	5.0 C (41.0 F)	32.8 C (91.0 F)	9.4 C (48.9 F)
Jul	37.8 C (100.0 F)	7.8 C (46.0 F)	32.8 C (91.0 F)	17.2 C (63.0 F)
Aug	37.2 C (99.0 F)	6.1 C (43.0 F)	33.9 C (93.0 F)	7.2 C (45.0 F)
Sep	37.8 C (100.0 F)	-1.7 C (28.9 F)	36.1 C (97.0 F)	3.3 C (37.9 F)
Oct	34.4 C (93.9 F)	-6.7 C (19.9 F)	32.8 C (91.0 F)	-0.6 C (30.9 F)
Nov	26.7 C (80.1 F)	-17.2 C (1.0 F)	23.9 C (75.0 F)	-9.4 C (15.1 F)
Dec	23.3 C (73.9 F)	-27.2 C (-17.0 F)	12.8 C (55.0 F)	-22.8 C (-9.0 F)

Which Years Hold Standing Records

1,464 standing records

1,464 records at Monmouth 4NW still stand. 2014 holds the most, with 80.

Standing records at Monmouth 4NW by the year they were set
Year set	Standing records
1995	50
1996	59
1997	60
1998	57
1999	51
2000	64
2001	57
2002	47
2003	41
2004	2
2006	56
2007	34
2008	39
2009	47
2010	38
2011	42
2012	63
2013	55
2014	80
2015	49
2016	28
2017	65
2018	63
2019	43
2020	40
2021	40
2022	44
2023	47
2024	52
2025	51

Wettest Day of Each Month

Sep: 104.1 mm (4.1 in)

The wettest day on record for each calendar month at Monmouth 4NW. The most was 104.1 mm (4.1 in) on 13 September 2008.

Record daily precipitation for each month at Monmouth 4NW
Month	Record daily precipitation (mm)	Date
Jan	45.7 mm (1.8 in)	28 January 2006
Feb	64.0 mm (2.5 in)	21 February 1997
Mar	51.1 mm (2.0 in)	31 March 1998
Apr	96.5 mm (3.8 in)	18 April 2013
May	78.5 mm (3.1 in)	29 May 2019
Jun	94.5 mm (3.7 in)	22 June 2016
Jul	92.2 mm (3.6 in)	17 July 2015
Aug	76.5 mm (3.0 in)	23 August 2002
Sep	104.1 mm (4.1 in)	13 September 2008
Oct	83.3 mm (3.3 in)	5 October 1998
Nov	52.6 mm (2.1 in)	8 November 2011
Dec	99.6 mm (3.9 in)	10 December 2003

Period of Record Coverage

1995 to 2025

30 years of record at Monmouth 4NW, 1995 to 2025. 4 years have data for under 90 percent of days and are left out of rankings: 1995, 2004, 2006, 2008.

Days with data per year at Monmouth 4NW
Year	Days with data	Share of year	Complete
1995	275	75%	No
1996	336	92%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	363	99%	Yes
2002	362	99%	Yes
2003	334	92%	Yes
2004	59	16%	No
2006	325	89%	No
2007	345	95%	Yes
2008	329	90%	No
2009	359	98%	Yes
2010	360	99%	Yes
2011	363	99%	Yes
2012	347	95%	Yes
2013	365	100%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	365	100%	Yes
2017	364	100%	Yes
2018	363	99%	Yes
2019	365	100%	Yes
2020	365	100%	Yes
2021	365	100%	Yes
2022	365	100%	Yes
2023	358	98%	Yes
2024	366	100%	Yes
2025	363	99%	Yes

Latest Records

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

Climate Trend

23 complete years, 1997 to 2025

One stripe for each of 23 complete years at Monmouth 4NW, 1997 to 2025. Blue stripes are years cooler than the station's own mean of 10.3 C (50.5 F); red stripes are warmer. The coolest year was 2014, at 7.8 C (46.1 F), and the warmest was 2024, at 12.2 C (53.9 F). The strongest colour marks a difference of 2.5 C (4.5 F).

Annual mean temperature at Monmouth 4NW as warming stripes, 1997 to 2025
Year	Annual mean temperature	Difference from the station mean
1997	9.3 C	-1.00 C
1998	11.7 C	+1.40 C
1999	10.6 C	+0.28 C
2000	10.1 C	-0.25 C
2001	10.7 C	+0.35 C
2002	10.5 C	+0.22 C
2007	10.4 C	+0.11 C
2009	9.1 C	-1.25 C
2010	10.0 C	-0.30 C
2011	10.1 C	-0.24 C
2013	9.0 C	-1.31 C
2014	7.8 C	-2.47 C
2015	10.3 C	+0.03 C
2016	11.4 C	+1.12 C
2017	11.0 C	+0.68 C
2018	9.7 C	-0.62 C
2019	9.5 C	-0.78 C
2020	10.4 C	+0.07 C
2021	10.7 C	+0.44 C
2022	9.7 C	-0.62 C
2023	11.6 C	+1.27 C
2024	12.2 C	+1.88 C
2025	11.2 C	+0.90 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

1995 to 2026

Yearly extremes at Monmouth 4NW: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.8 C (100.0 F)	2000	35.0 C (95.0 F)	31
Coldest night (TNn)	-31.7 C (-25.1 F)	1996	-24.4 C (-11.9 F)	31
Wettest day (Rx1day)	104.1 mm (4.1 in)	2008	64.0 mm (2.5 in)	31
Wettest five days (Rx5day)	147.9 mm (5.8 in)	2026	94.5 mm (3.7 in)	31
Longest dry spell (CDD)	37 days	1999	20 days	31

Hottest day (TXx)

The hottest day of the year at Monmouth 4NW, 1995 to 2026. The record is 37.8 C (100.0 F) in 2000, marked on the chart; the median year is 35.0 C (95.0 F).

Hottest day (TXx) at Monmouth 4NW by year
Year	Hottest day (TXx)
1995	36.1 C (97.0 F)
1996	33.9 C (93.0 F)
1997	35.0 C (95.0 F)
1998	35.0 C (95.0 F)
1999	35.6 C (96.1 F)
2000	37.8 C (100.0 F)
2001	36.7 C (98.1 F)
2002	34.4 C (93.9 F)
2003	37.2 C (99.0 F)
2004	31.7 C (89.1 F)
2006	35.0 C (95.0 F)
2007	33.9 C (93.0 F)
2008	32.8 C (91.0 F)
2009	33.3 C (91.9 F)
2010	33.3 C (91.9 F)
2011	36.7 C (98.1 F)
2012	37.8 C (100.0 F)
2013	36.7 C (98.1 F)
2014	32.8 C (91.0 F)
2015	33.3 C (91.9 F)
2016	35.0 C (95.0 F)
2017	34.4 C (93.9 F)
2018	37.2 C (99.0 F)
2019	33.9 C (93.0 F)
2020	33.3 C (91.9 F)
2021	33.9 C (93.0 F)
2022	35.6 C (96.1 F)
2023	35.0 C (95.0 F)
2024	35.0 C (95.0 F)
2025	36.1 C (97.0 F)
2026	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Monmouth 4NW, 1995 to 2026. The record is -31.7 C (-25.1 F) in 1996, marked on the chart; the median year is -24.4 C (-11.9 F).

Coldest night (TNn) at Monmouth 4NW by year
Year	Coldest night (TNn)
1995	-20.6 C (-5.1 F)
1996	-31.7 C (-25.1 F)
1997	-25.0 C (-13.0 F)
1998	-21.7 C (-7.1 F)
1999	-30.6 C (-23.1 F)
2000	-27.2 C (-17.0 F)
2001	-22.8 C (-9.0 F)
2002	-22.8 C (-9.0 F)
2003	-23.3 C (-9.9 F)
2004	-16.1 C (3.0 F)
2006	-22.2 C (-8.0 F)
2007	-23.3 C (-9.9 F)
2008	-24.4 C (-11.9 F)
2009	-30.6 C (-23.1 F)
2010	-25.6 C (-14.1 F)
2011	-25.6 C (-14.1 F)
2012	-15.0 C (5.0 F)
2013	-24.4 C (-11.9 F)
2014	-27.8 C (-18.0 F)
2015	-27.8 C (-18.0 F)
2016	-23.9 C (-11.0 F)
2017	-24.4 C (-11.9 F)
2018	-28.9 C (-20.0 F)
2019	-30.0 C (-22.0 F)
2020	-25.0 C (-13.0 F)
2021	-25.6 C (-14.1 F)
2022	-24.4 C (-11.9 F)
2023	-19.4 C (-2.9 F)
2024	-28.9 C (-20.0 F)
2025	-25.6 C (-14.1 F)
2026	-24.4 C (-11.9 F)

Wettest day (Rx1day)

The wettest day of the year at Monmouth 4NW, 1995 to 2026. The record is 104.1 mm (4.1 in) in 2008, marked on the chart; the median year is 64.0 mm (2.5 in).

Wettest day (Rx1day) at Monmouth 4NW by year
Year	Wettest day (Rx1day)
1995	68.6 mm (2.7 in)
1996	48.5 mm (1.9 in)
1997	64.0 mm (2.5 in)
1998	83.3 mm (3.3 in)
1999	79.8 mm (3.1 in)
2000	55.9 mm (2.2 in)
2001	39.1 mm (1.5 in)
2002	76.5 mm (3.0 in)
2003	99.6 mm (3.9 in)
2004	71.1 mm (2.8 in)
2006	45.7 mm (1.8 in)
2007	53.8 mm (2.1 in)
2008	104.1 mm (4.1 in)
2009	54.1 mm (2.1 in)
2010	83.6 mm (3.3 in)
2011	76.2 mm (3.0 in)
2012	35.6 mm (1.4 in)
2013	96.5 mm (3.8 in)
2014	92.7 mm (3.6 in)
2015	92.2 mm (3.6 in)
2016	94.5 mm (3.7 in)
2017	47.2 mm (1.9 in)
2018	59.4 mm (2.3 in)
2019	78.5 mm (3.1 in)
2020	52.6 mm (2.1 in)
2021	53.6 mm (2.1 in)
2022	26.7 mm (1.1 in)
2023	62.0 mm (2.4 in)
2024	40.4 mm (1.6 in)
2025	41.4 mm (1.6 in)
2026	102.4 mm (4.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Monmouth 4NW, 1995 to 2026. The record is 147.9 mm (5.8 in) in 2026, marked on the chart; the median year is 94.5 mm (3.7 in).

Wettest five days (Rx5day) at Monmouth 4NW by year
Year	Wettest five days (Rx5day)
1995	108.0 mm (4.3 in)
1996	102.5 mm (4.0 in)
1997	123.1 mm (4.8 in)
1998	99.3 mm (3.9 in)
1999	120.2 mm (4.7 in)
2000	109.0 mm (4.3 in)
2001	97.4 mm (3.8 in)
2002	117.7 mm (4.6 in)
2003	115.3 mm (4.5 in)
2004	73.6 mm (2.9 in)
2006	47.7 mm (1.9 in)
2007	75.5 mm (3.0 in)
2008	135.9 mm (5.4 in)
2009	115.4 mm (4.5 in)
2010	99.1 mm (3.9 in)
2011	62.7 mm (2.5 in)
2012	32.3 mm (1.3 in)
2013	112.1 mm (4.4 in)
2014	114.3 mm (4.5 in)
2015	72.4 mm (2.9 in)
2016	94.5 mm (3.7 in)
2017	68.2 mm (2.7 in)
2018	72.4 mm (2.9 in)
2019	88.2 mm (3.5 in)
2020	60.5 mm (2.4 in)
2021	81.0 mm (3.2 in)
2022	43.9 mm (1.7 in)
2023	71.1 mm (2.8 in)
2024	76.2 mm (3.0 in)
2025	56.6 mm (2.2 in)
2026	147.9 mm (5.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Monmouth 4NW, 1995 to 2026. The record is 37 days in 1999, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Monmouth 4NW by year
Year	Longest dry spell (CDD)
1995	21 days
1996	29 days
1997	17 days
1998	16 days
1999	37 days
2000	18 days
2001	18 days
2002	28 days
2003	17 days
2004	15 days
2006	19 days
2007	22 days
2008	14 days
2009	16 days
2010	22 days
2011	25 days
2012	23 days
2013	37 days
2014	19 days
2015	34 days
2016	19 days
2017	32 days
2018	16 days
2019	14 days
2020	17 days
2021	20 days
2022	18 days
2023	23 days
2024	26 days
2025	24 days
2026	25 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

23 years with a frost

Across 23 years with a frost, the median last spring frost at Monmouth 4NW falls on 21 April and the median first autumn frost on 13 October, which leaves a median of 170 days between them.

Frost dates and growing season at Monmouth 4NW
Measure	Median, all years	Earliest period	Recent period (1997 to 2025)	Recent against earliest	Fitted trend
Last spring frost	21 April	n/a	21 April	n/a	n/a
First autumn frost	13 October	n/a	13 October	n/a	n/a
Growing days	170 days	n/a	170 days	n/a	n/a

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 Monmouth 4NW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Monmouth 4NW 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).