Avon Weather Records (USC00110356)

Record envelope, standing records and threshold days for Avon (USC00110356), Illinois, United States, with 77 years of record.

Key Facts for Avon

Avon (USC00110356) is a weather station in Illinois, United States at 40.66 latitude and -90.44 longitude, 195 m (640 ft) above sea level.
The station reports from 1950 to 2026, 77 years of record.
1,464 records set at Avon still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Avon set a daily record snow depth of 12.7 cm (5.0 in) on 17 December 2025.

About the Station

Location: Illinois, United States, 40.66 latitude, -90.44 longitude.
Elevation: 195 m (640 ft).
Period of record: 1950 to 2026, 77 years.
Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

37 days at or beyond a record

The band shows the record high and record low for each calendar day at Avon. The lines show the 2026 daily maximum and minimum. 37 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Avon, 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)	-32.2 C (-26.0 F)	15.0 C (59.0 F)	-23.9 C (-11.0 F)
Feb	25.0 C (77.0 F)	-25.6 C (-14.1 F)	22.8 C (73.0 F)	-17.2 C (1.0 F)
Mar	30.6 C (87.1 F)	-20.0 C (-4.0 F)	30.6 C (87.1 F)	-14.4 C (6.1 F)
Apr	30.0 C (86.0 F)	-18.3 C (-0.9 F)	29.4 C (84.9 F)	-2.2 C (28.0 F)
May	36.1 C (97.0 F)	-2.8 C (27.0 F)	31.7 C (89.1 F)	1.7 C (35.1 F)
Jun	36.7 C (98.1 F)	6.7 C (44.1 F)	31.1 C (88.0 F)	9.4 C (48.9 F)
Jul	38.9 C (102.0 F)	7.8 C (46.0 F)	33.3 C (91.9 F)	11.1 C (52.0 F)
Aug	35.6 C (96.1 F)	6.1 C (43.0 F)	30.6 C (87.1 F)	10.6 C (51.1 F)
Sep	37.2 C (99.0 F)	-0.6 C (30.9 F)	33.9 C (93.0 F)	6.7 C (44.1 F)
Oct	32.2 C (90.0 F)	-6.7 C (19.9 F)	27.8 C (82.0 F)	5.0 C (41.0 F)
Nov	25.0 C (77.0 F)	-16.7 C (1.9 F)	n/a	n/a
Dec	22.2 C (72.0 F)	-24.4 C (-11.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Avon still stand. 2012 holds the most, with 155.

All-Time Record Progression

2 new records

2 all-time records were set at Avon between 3 October 1986 and 2 February 2011. Each dot is a new record.

When Avon set new all-time records
Date	Kind	Detail
1986-10-03	Record daily precipitation	Record daily precipitation 187.5 mm (7.4 in)
2011-02-02	Record daily snowfall	Record daily snowfall 45.7 cm (18.0 in)

Wettest Day of Each Month

Oct: 187.5 mm (7.4 in)

The wettest day on record for each calendar month at Avon. The most was 187.5 mm (7.4 in) on 3 October 1986.

Record daily precipitation for each month at Avon
Month	Record daily precipitation (mm)	Date
Jan	56.6 mm (2.2 in)	2 January 1965
Feb	84.3 mm (3.3 in)	21 February 1997
Mar	120.7 mm (4.8 in)	25 March 1954
Apr	133.4 mm (5.3 in)	18 April 2013
May	112.0 mm (4.4 in)	16 May 2009
Jun	114.0 mm (4.5 in)	20 June 1964
Jul	136.4 mm (5.4 in)	11 July 2017
Aug	139.7 mm (5.5 in)	23 August 2002
Sep	145.3 mm (5.7 in)	24 September 1961
Oct	187.5 mm (7.4 in)	3 October 1986
Nov	61.7 mm (2.4 in)	30 November 2006
Dec	71.6 mm (2.8 in)	3 December 1982

Period of Record Coverage

2008 to 2026

19 years of record at Avon, 2008 to 2026. 7 years have data for under 90 percent of days and are left out of rankings: 2011, 2013, 2014, 2015, 2016, 2019, 2026.

Days with data per year at Avon
Year	Days with data	Share of year	Complete
2008	332	91%	Yes
2009	353	97%	Yes
2010	360	99%	Yes
2011	301	82%	No
2012	363	99%	Yes
2013	145	40%	No
2014	73	20%	No
2015	236	65%	No
2016	79	22%	No
2017	360	99%	Yes
2018	350	96%	Yes
2019	282	77%	No
2020	357	98%	Yes
2021	363	99%	Yes
2022	361	99%	Yes
2023	361	99%	Yes
2024	362	99%	Yes
2025	363	99%	Yes
2026	271	74%	No

Latest Records

Latest records at Avon
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 December 2025	Avon, US	daily snow depth	12.7 cm (5.0 in)	2.5 cm (1.0 in)	52 years	25 of 100 (Routine)
14 December 2025	Avon, US	daily snowfall	12.7 cm (5.0 in)	7.6 cm (3.0 in)	22 years	30 of 100 (Routine)
14 December 2025	Avon, US	daily snow depth	20.3 cm (8.0 in)	5.1 cm (2.0 in)	36 years	25 of 100 (Routine)
2 December 2025	Avon, US	daily snowfall (Tie)	5.1 cm (2.0 in)	tie	70 years	7 of 100 (Routine)
2 December 2025	Avon, US	daily snow depth (Tie)	20.3 cm (8.0 in)	tie	51 years	5 of 100 (Routine)
30 November 2025	Avon, US	daily snow depth (Tie)	15.2 cm (6.0 in)	tie	51 years	5 of 100 (Routine)
20 July 2025	Avon, US	daily rain	51.8 mm (2.0 in)	3.0 mm (0.12 in)	58 years	25 of 100 (Routine)
12 July 2025	Avon, US	daily rain	41.9 mm (1.6 in)	16.8 mm (0.7 in)	67 years	36 of 100 (Notable)
4 June 2025	Avon, US	daily rain	31.2 mm (1.2 in)	0.2 mm (0.01 in)	16 years	12 of 100 (Routine)
20 May 2025	Avon, US	daily rain	50.8 mm (2.0 in)	2.3 mm (0.09 in)	40 years	20 of 100 (Routine)
3 April 2025	Avon, US	daily rain	22.4 mm (0.9 in)	2.6 mm (0.10 in)	60 years	20 of 100 (Routine)
5 November 2024	Avon, US	daily rain	54.9 mm (2.2 in)	16.0 mm (0.6 in)	34 years	33 of 100 (Routine)
29 July 2024	Avon, US	daily rain	40.1 mm (1.6 in)	3.3 mm (0.13 in)	70 years	29 of 100 (Routine)
16 July 2024	Avon, US	daily rain	111.3 mm (4.4 in)	38.7 mm (1.5 in)	4 years	30 of 100 (Routine)
3 May 2024	Avon, US	daily rain	26.7 mm (1.1 in)	5.9 mm (0.23 in)	45 years	24 of 100 (Routine)
28 April 2024	Avon, US	daily rain	36.3 mm (1.4 in)	3.8 mm (0.15 in)	22 years	16 of 100 (Routine)
27 April 2024	Avon, US	daily rain	34.5 mm (1.4 in)	10.6 mm (0.4 in)	65 years	35 of 100 (Notable)
26 March 2024	Avon, US	daily rain	33.3 mm (1.3 in)	8.9 mm (0.35 in)	65 years	34 of 100 (Routine)
14 March 2024	Avon, US	daily rain	22.9 mm (0.9 in)	2.1 mm (0.08 in)	51 years	20 of 100 (Routine)
26 January 2024	Avon, US	daily rain	15.2 mm (0.6 in)	4.5 mm (0.18 in)	61 years	20 of 100 (Routine)

Climate Trend

10 complete years, 2009 to 2025

One stripe for each of 10 complete years at Avon, 2009 to 2025. Blue stripes are years cooler than the station's own mean of 10.5 C (50.8 F); red stripes are warmer. The coolest year was 2022, at 9.3 C (48.7 F), and the warmest was 2012, at 12.0 C (53.6 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Avon as warming stripes, 2009 to 2025
Year	Annual mean temperature	Difference from the station mean
2009	9.3 C	-1.13 C
2010	10.3 C	-0.12 C
2012	12.0 C	+1.52 C
2017	10.4 C	-0.10 C
2020	10.3 C	-0.21 C
2021	10.4 C	-0.02 C
2022	9.3 C	-1.17 C
2023	10.9 C	+0.44 C
2024	11.3 C	+0.83 C
2025	10.4 C	-0.05 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

1950 to 2026

Yearly extremes at Avon: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.9 C (102.0 F)	2012	33.9 C (93.0 F)	19
Coldest night (TNn)	-32.2 C (-26.0 F)	2009	-25.0 C (-13.0 F)	19
Wettest day (Rx1day)	187.5 mm (7.4 in)	1986	66.0 mm (2.6 in)	77
Wettest five days (Rx5day)	247.2 mm (9.7 in)	1986	95.7 mm (3.8 in)	77
Longest dry spell (CDD)	40 days	1956	21 days	77

Hottest day (TXx)

The hottest day of the year at Avon, 1950 to 2026. The record is 38.9 C (102.0 F) in 2012, marked on the chart; the median year is 33.9 C (93.0 F).

Hottest day (TXx) at Avon by year
Year	Hottest day (TXx)
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	33.3 C (91.9 F)
2009	36.7 C (98.1 F)
2010	34.4 C (93.9 F)
2011	37.2 C (99.0 F)
2012	38.9 C (102.0 F)
2013	31.7 C (89.1 F)
2014	25.0 C (77.0 F)
2015	32.2 C (90.0 F)
2016	31.7 C (89.1 F)
2017	33.9 C (93.0 F)
2018	36.1 C (97.0 F)
2019	33.3 C (91.9 F)
2020	33.3 C (91.9 F)
2021	32.8 C (91.0 F)
2022	35.0 C (95.0 F)
2023	35.0 C (95.0 F)
2024	34.4 C (93.9 F)
2025	34.4 C (93.9 F)
2026	33.9 C (93.0 F)

Coldest night (TNn)

The coldest night of the year at Avon, 1950 to 2026. The record is -32.2 C (-26.0 F) in 2009, marked on the chart; the median year is -25.0 C (-13.0 F).

Coldest night (TNn) at Avon by year
Year	Coldest night (TNn)
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	-20.0 C (-4.0 F)
2009	-32.2 C (-26.0 F)
2010	-25.6 C (-14.1 F)
2011	-25.0 C (-13.0 F)
2012	-16.7 C (1.9 F)
2013	-17.8 C (0.0 F)
2014	-17.2 C (1.0 F)
2015	-25.0 C (-13.0 F)
2016	-22.8 C (-9.0 F)
2017	-24.4 C (-11.9 F)
2018	-27.2 C (-17.0 F)
2019	-30.6 C (-23.1 F)
2020	-25.0 C (-13.0 F)
2021	-25.6 C (-14.1 F)
2022	-23.9 C (-11.0 F)
2023	-17.8 C (0.0 F)
2024	-27.2 C (-17.0 F)
2025	-25.0 C (-13.0 F)
2026	-23.9 C (-11.0 F)

Wettest day (Rx1day)

The wettest day of the year at Avon, 1950 to 2026. The record is 187.5 mm (7.4 in) in 1986, marked on the chart; the median year is 66.0 mm (2.6 in).

Wettest day (Rx1day) at Avon by year
Year	Wettest day (Rx1day)
1950	5.8 mm (0.23 in)
1951	28.4 mm (1.1 in)
1952	106.2 mm (4.2 in)
1953	90.7 mm (3.6 in)
1954	120.7 mm (4.8 in)
1955	66.0 mm (2.6 in)
1956	74.2 mm (2.9 in)
1957	44.7 mm (1.8 in)
1958	74.2 mm (2.9 in)
1959	87.4 mm (3.4 in)
1960	55.4 mm (2.2 in)
1961	145.3 mm (5.7 in)
1962	56.1 mm (2.2 in)
1963	39.9 mm (1.6 in)
1964	114.0 mm (4.5 in)
1965	84.3 mm (3.3 in)
1966	50.3 mm (2.0 in)
1967	121.4 mm (4.8 in)
1968	88.9 mm (3.5 in)
1969	79.8 mm (3.1 in)
1970	57.4 mm (2.3 in)
1971	39.1 mm (1.5 in)
1972	69.6 mm (2.7 in)
1973	87.6 mm (3.4 in)
1974	35.6 mm (1.4 in)
1975	56.4 mm (2.2 in)
1976	67.1 mm (2.6 in)
1977	45.7 mm (1.8 in)
1978	42.7 mm (1.7 in)
1979	100.8 mm (4.0 in)
1980	75.7 mm (3.0 in)
1981	97.8 mm (3.9 in)
1982	89.7 mm (3.5 in)
1983	67.8 mm (2.7 in)
1984	56.1 mm (2.2 in)
1985	97.8 mm (3.9 in)
1986	187.5 mm (7.4 in)
1987	82.3 mm (3.2 in)
1988	35.3 mm (1.4 in)
1989	37.1 mm (1.5 in)
1990	57.4 mm (2.3 in)
1991	45.0 mm (1.8 in)
1992	66.0 mm (2.6 in)
1993	76.2 mm (3.0 in)
1994	50.3 mm (2.0 in)
1995	50.3 mm (2.0 in)
1996	108.5 mm (4.3 in)
1997	84.3 mm (3.3 in)
1998	57.7 mm (2.3 in)
1999	101.6 mm (4.0 in)
2000	88.9 mm (3.5 in)
2001	41.4 mm (1.6 in)
2002	139.7 mm (5.5 in)
2003	77.7 mm (3.1 in)
2004	62.2 mm (2.4 in)
2005	42.2 mm (1.7 in)
2006	61.7 mm (2.4 in)
2007	52.1 mm (2.1 in)
2008	46.7 mm (1.8 in)
2009	112.0 mm (4.4 in)
2010	70.1 mm (2.8 in)
2011	50.3 mm (2.0 in)
2012	53.3 mm (2.1 in)
2013	133.4 mm (5.3 in)
2014	104.1 mm (4.1 in)
2015	62.7 mm (2.5 in)
2016	57.7 mm (2.3 in)
2017	136.4 mm (5.4 in)
2018	87.6 mm (3.4 in)
2019	53.8 mm (2.1 in)
2020	72.6 mm (2.9 in)
2021	54.6 mm (2.1 in)
2022	41.7 mm (1.6 in)
2023	64.5 mm (2.5 in)
2024	111.3 mm (4.4 in)
2025	51.8 mm (2.0 in)
2026	37.6 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Avon, 1950 to 2026. The record is 247.2 mm (9.7 in) in 1986, marked on the chart; the median year is 95.7 mm (3.8 in).

Wettest five days (Rx5day) at Avon by year
Year	Wettest five days (Rx5day)
1950	10.9 mm (0.4 in)
1951	51.8 mm (2.0 in)
1952	186.5 mm (7.3 in)
1953	90.7 mm (3.6 in)
1954	120.7 mm (4.8 in)
1955	78.0 mm (3.1 in)
1956	80.6 mm (3.2 in)
1957	69.4 mm (2.7 in)
1958	143.5 mm (5.6 in)
1959	122.9 mm (4.8 in)
1960	67.7 mm (2.7 in)
1961	191.2 mm (7.5 in)
1962	75.2 mm (3.0 in)
1963	41.7 mm (1.6 in)
1964	122.4 mm (4.8 in)
1965	109.2 mm (4.3 in)
1966	68.6 mm (2.7 in)
1967	195.9 mm (7.7 in)
1968	94.0 mm (3.7 in)
1969	148.2 mm (5.8 in)
1970	102.8 mm (4.0 in)
1971	48.3 mm (1.9 in)
1972	87.9 mm (3.5 in)
1973	137.4 mm (5.4 in)
1974	80.1 mm (3.2 in)
1975	78.8 mm (3.1 in)
1976	128.3 mm (5.1 in)
1977	118.9 mm (4.7 in)
1978	81.0 mm (3.2 in)
1979	113.0 mm (4.4 in)
1980	142.0 mm (5.6 in)
1981	117.6 mm (4.6 in)
1982	153.7 mm (6.1 in)
1983	94.7 mm (3.7 in)
1984	89.2 mm (3.5 in)
1985	109.8 mm (4.3 in)
1986	247.2 mm (9.7 in)
1987	98.8 mm (3.9 in)
1988	54.1 mm (2.1 in)
1989	95.7 mm (3.8 in)
1990	84.4 mm (3.3 in)
1991	113.8 mm (4.5 in)
1992	135.4 mm (5.3 in)
1993	139.4 mm (5.5 in)
1994	70.3 mm (2.8 in)
1995	94.2 mm (3.7 in)
1996	141.8 mm (5.6 in)
1997	92.7 mm (3.6 in)
1998	79.7 mm (3.1 in)
1999	119.9 mm (4.7 in)
2000	119.1 mm (4.7 in)
2001	63.5 mm (2.5 in)
2002	169.7 mm (6.7 in)
2003	129.5 mm (5.1 in)
2004	90.2 mm (3.6 in)
2005	57.7 mm (2.3 in)
2006	94.8 mm (3.7 in)
2007	87.4 mm (3.4 in)
2008	102.5 mm (4.0 in)
2009	158.2 mm (6.2 in)
2010	102.4 mm (4.0 in)
2011	92.5 mm (3.6 in)
2012	76.7 mm (3.0 in)
2013	156.5 mm (6.2 in)
2014	120.1 mm (4.7 in)
2015	90.6 mm (3.6 in)
2016	63.0 mm (2.5 in)
2017	160.6 mm (6.3 in)
2018	101.8 mm (4.0 in)
2019	87.2 mm (3.4 in)
2020	94.9 mm (3.7 in)
2021	116.6 mm (4.6 in)
2022	55.4 mm (2.2 in)
2023	121.7 mm (4.8 in)
2024	112.6 mm (4.4 in)
2025	64.3 mm (2.5 in)
2026	68.3 mm (2.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Avon, 1950 to 2026. The record is 40 days in 1956, marked on the chart; the median year is 21 days.

Longest dry spell (CDD) at Avon by year
Year	Longest dry spell (CDD)
1950	21 days
1951	20 days
1952	32 days
1953	23 days
1954	26 days
1955	28 days
1956	40 days
1957	28 days
1958	29 days
1959	20 days
1960	25 days
1961	20 days
1962	21 days
1963	36 days
1964	30 days
1965	26 days
1966	26 days
1967	17 days
1968	26 days
1969	19 days
1970	17 days
1971	31 days
1972	21 days
1973	15 days
1974	15 days
1975	14 days
1976	29 days
1977	21 days
1978	27 days
1979	31 days
1980	28 days
1981	23 days
1982	24 days
1983	20 days
1984	16 days
1985	16 days
1986	15 days
1987	24 days
1988	31 days
1989	25 days
1990	17 days
1991	20 days
1992	25 days
1993	21 days
1994	25 days
1995	21 days
1996	19 days
1997	21 days
1998	15 days
1999	38 days
2000	18 days
2001	24 days
2002	27 days
2003	16 days
2004	25 days
2005	25 days
2006	22 days
2007	16 days
2008	15 days
2009	14 days
2010	20 days
2011	21 days
2012	25 days
2013	14 days
2014	19 days
2015	22 days
2016	19 days
2017	21 days
2018	16 days
2019	15 days
2020	17 days
2021	31 days
2022	17 days
2023	25 days
2024	24 days
2025	20 days
2026	31 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.

Rainfall Return Levels

66 years, 1954 to 2025

A day with at least 67.0 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 165.0 mm (6.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Avon: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	67.0 mm (2.6 in)
5 years	91.8 mm (3.6 in)
10 years	108.8 mm (4.3 in)
25 years	130.9 mm (5.2 in)
50 years	147.8 mm (5.8 in)
100 years	165.0 mm (6.5 in)	Longer than the 66 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 66 years of values from 1954 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 145.3 mm (5.7 in) in 1961; 139.7 mm (5.5 in) in 2002; 136.4 mm (5.4 in) in 2017.

Download the Data

Data for Avon standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Avon 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).