Record envelope, standing records and threshold days for Irwinton 4 WNW (USC00094594), Georgia, United States, with 56 years of record.
Key Facts for Irwinton 4 WNW
Irwinton 4 WNW (USC00094594) is a weather station in Georgia, United States at 32.83 latitude and -83.24 longitude, 157 m (515 ft) above sea level.
The station reports from 1956 to 2011, 56 years of record.
1,464 records set at Irwinton 4 WNW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Irwinton 4 WNW tied a daily record high maximum temperature of 32.2 C (90.0 F) on 28 April 2011.
About the Station
Location: Georgia, United States, 32.83 latitude, -83.24 longitude.
Elevation: 157 m (515 ft).
Period of record: 1956 to 2011, 56 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Irwinton 4 WNW. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Irwinton 4 WNW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
29.4 C (84.9 F)
-20.0 C (-4.0 F)
n/a
n/a
Feb
29.4 C (84.9 F)
-13.3 C (8.1 F)
n/a
n/a
Mar
32.2 C (90.0 F)
-12.2 C (10.0 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-2.2 C (28.0 F)
n/a
n/a
May
36.1 C (97.0 F)
-0.6 C (30.9 F)
n/a
n/a
Jun
41.1 C (106.0 F)
6.7 C (44.1 F)
n/a
n/a
Jul
41.7 C (107.1 F)
12.2 C (54.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
12.2 C (54.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
3.9 C (39.0 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-1.7 C (28.9 F)
n/a
n/a
Nov
30.6 C (87.1 F)
-8.9 C (16.0 F)
n/a
n/a
Dec
28.3 C (82.9 F)
-15.0 C (5.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Irwinton 4 WNW still stand. 1967 holds the most, with 58.
Standing records at Irwinton 4 WNW by the year they were set
Year set
Standing records
1956
14
1957
6
1958
12
1965
13
1966
48
1967
58
1968
35
1969
35
1970
36
1971
39
1972
35
1973
23
1974
55
1975
30
1976
36
1977
49
1978
43
1979
35
1980
52
1981
34
1982
38
1983
26
1984
43
1985
46
1986
45
1987
19
1988
17
1989
38
1990
28
1991
29
1992
24
1993
22
1994
17
1995
27
1996
26
1997
31
1998
27
1999
37
2000
31
2001
17
2002
25
2003
15
2004
31
2005
25
2006
14
2007
24
2008
25
2009
6
2010
17
2011
6
All-Time Record Progression
1 new records
1 all-time records were set at Irwinton 4 WNW between 3 September 1998 and 3 September 1998. Each dot is a new record.
When Irwinton 4 WNW set new all-time records
Date
Kind
Detail
1998-09-03
Record daily precipitation
Record daily precipitation 134.4 mm (5.3 in)
Wettest Day of Each Month
Sep: 134.4 mm (5.3 in)
The wettest day on record for each calendar month at Irwinton 4 WNW. The most was 134.4 mm (5.3 in) on 3 September 1998.
Record daily precipitation for each month at Irwinton 4 WNW
Month
Record daily precipitation (mm)
Date
Jan
90.7 mm (3.6 in)
30 January 1991
Feb
99.1 mm (3.9 in)
11 February 1981
Mar
112.8 mm (4.4 in)
21 March 1977
Apr
63.8 mm (2.5 in)
14 April 1975
May
86.4 mm (3.4 in)
15 May 1976
Jun
91.2 mm (3.6 in)
3 June 2005
Jul
127.5 mm (5.0 in)
6 July 1994
Aug
95.5 mm (3.8 in)
26 August 1995
Sep
134.4 mm (5.3 in)
3 September 1998
Oct
128.5 mm (5.1 in)
30 October 1970
Nov
101.6 mm (4.0 in)
5 November 1977
Dec
128.5 mm (5.1 in)
6 December 1972
Period of Record Coverage
1956 to 2011
Complete yearUnder 90 percent of days
50 years of record at Irwinton 4 WNW, 1956 to 2011. 26 years have data for under 90 percent of days and are left out of rankings: 1956, 1957, 1958, 1965, 1973, 1982, 1983, 1984 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 31 complete years at Irwinton 4 WNW, 1966 to 2008. Blue stripes are years cooler than the station's own mean of 18.3 C (64.9 F); red stripes are warmer. The coolest year was 1966, at 16.8 C (62.3 F), and the warmest was 1998, at 19.8 C (67.6 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Irwinton 4 WNW as warming stripes, 1966 to 2008
Year
Annual mean temperature
Difference from the station mean
1966
16.8 C
-1.46 C
1967
17.6 C
-0.65 C
1968
17.7 C
-0.63 C
1969
17.4 C
-0.84 C
1970
18.3 C
-0.01 C
1971
18.1 C
-0.16 C
1972
18.3 C
+0.01 C
1974
18.8 C
+0.56 C
1975
18.7 C
+0.39 C
1976
17.4 C
-0.89 C
1979
17.7 C
-0.59 C
1981
18.1 C
-0.21 C
1982
18.9 C
+0.61 C
1985
18.7 C
+0.42 C
1988
18.2 C
-0.13 C
1989
18.3 C
-0.02 C
1990
19.6 C
+1.32 C
1991
18.8 C
+0.48 C
1993
18.1 C
-0.19 C
1995
18.3 C
+0.03 C
1996
18.0 C
-0.26 C
1997
18.1 C
-0.15 C
1998
19.8 C
+1.48 C
1999
19.3 C
+0.99 C
2002
18.6 C
+0.32 C
2003
17.9 C
-0.41 C
2004
18.6 C
+0.29 C
2005
17.8 C
-0.50 C
2006
18.6 C
+0.32 C
2007
18.5 C
+0.24 C
2008
18.0 C
-0.31 C
The annual mean temperature here has risen by 0.18 C (0.02 to 0.34) per decade over 1966 to 2008. In Fahrenheit: 0.32 F (0.03 to 0.61) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Irwinton 4 WNW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.18 C (0.02 to 0.34) per decade
0.32 F (0.03 to 0.61) per decade
1966 to 2008
31
Rise
Mean daily maximum
-0.01 C (-0.19 to 0.18) per decade
-0.01 F (-0.35 to 0.32) per decade
1966 to 2008
31
Not clearly different from zero
Mean daily minimum
0.4 C (0.2 to 0.5) per decade
0.6 F (0.3 to 1.0) per decade
1966 to 2008
31
Rise
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
1956 to 2011
Yearly extremes at Irwinton 4 WNW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1980
37.8 C (100.0 F)
50
Coldest night (TNn)
-20.0 C (-4.0 F)
1985
-9.4 C (15.1 F)
50
Wettest day (Rx1day)
134.4 mm (5.3 in)
1998
74.8 mm (2.9 in)
50
Wettest five days (Rx5day)
193.6 mm (7.6 in)
1970
114.3 mm (4.5 in)
50
Longest dry spell (CDD)
44 days
1978
22 days
50
Hottest day (TXx)
The hottest day of the year at Irwinton 4 WNW, 1956 to 2011. The record is 41.7 C (107.1 F) in 1980, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Irwinton 4 WNW by year
Year
Hottest day (TXx)
1956
31.1 C (88.0 F)
1957
27.2 C (81.0 F)
1958
37.8 C (100.0 F)
1965
36.7 C (98.1 F)
1966
39.4 C (102.9 F)
1967
36.1 C (97.0 F)
1968
39.4 C (102.9 F)
1969
36.7 C (98.1 F)
1970
38.3 C (100.9 F)
1971
36.7 C (98.1 F)
1972
37.2 C (99.0 F)
1973
35.6 C (96.1 F)
1974
38.9 C (102.0 F)
1975
38.3 C (100.9 F)
1976
37.8 C (100.0 F)
1977
40.0 C (104.0 F)
1978
41.1 C (106.0 F)
1979
37.8 C (100.0 F)
1980
41.7 C (107.1 F)
1981
38.9 C (102.0 F)
1982
36.1 C (97.0 F)
1983
39.4 C (102.9 F)
1984
37.8 C (100.0 F)
1985
38.3 C (100.9 F)
1986
41.7 C (107.1 F)
1987
38.9 C (102.0 F)
1988
37.2 C (99.0 F)
1989
36.7 C (98.1 F)
1990
39.4 C (102.9 F)
1991
36.7 C (98.1 F)
1992
36.1 C (97.0 F)
1993
38.3 C (100.9 F)
1994
33.9 C (93.0 F)
1995
38.9 C (102.0 F)
1996
36.7 C (98.1 F)
1997
36.7 C (98.1 F)
1998
39.4 C (102.9 F)
1999
38.9 C (102.0 F)
2000
40.0 C (104.0 F)
2001
36.1 C (97.0 F)
2002
39.4 C (102.9 F)
2003
34.4 C (93.9 F)
2004
37.2 C (99.0 F)
2005
37.2 C (99.0 F)
2006
40.0 C (104.0 F)
2007
40.0 C (104.0 F)
2008
38.3 C (100.9 F)
2009
31.1 C (88.0 F)
2010
32.2 C (90.0 F)
2011
32.2 C (90.0 F)
Coldest night (TNn)
The coldest night of the year at Irwinton 4 WNW, 1956 to 2011. The record is -20.0 C (-4.0 F) in 1985, marked on the chart; the median year is -9.4 C (15.1 F).
Coldest night (TNn) at Irwinton 4 WNW by year
Year
Coldest night (TNn)
1956
-5.6 C (21.9 F)
1957
-8.3 C (17.1 F)
1958
-2.2 C (28.0 F)
1965
-8.3 C (17.1 F)
1966
-16.7 C (1.9 F)
1967
-11.7 C (10.9 F)
1968
-9.4 C (15.1 F)
1969
-9.4 C (15.1 F)
1970
-13.9 C (7.0 F)
1971
-11.1 C (12.0 F)
1972
-11.7 C (10.9 F)
1973
-7.8 C (18.0 F)
1974
-11.1 C (12.0 F)
1975
-9.4 C (15.1 F)
1976
-9.4 C (15.1 F)
1977
-15.0 C (5.0 F)
1978
-8.9 C (16.0 F)
1979
-10.6 C (12.9 F)
1980
-12.2 C (10.0 F)
1981
-10.6 C (12.9 F)
1982
-13.3 C (8.1 F)
1983
-15.0 C (5.0 F)
1984
-7.8 C (18.0 F)
1985
-20.0 C (-4.0 F)
1986
-12.8 C (9.0 F)
1987
-4.4 C (24.1 F)
1988
-8.3 C (17.1 F)
1989
-11.7 C (10.9 F)
1990
-3.9 C (25.0 F)
1991
-10.0 C (14.0 F)
1992
-2.2 C (28.0 F)
1993
-7.2 C (19.0 F)
1994
-12.2 C (10.0 F)
1995
-9.4 C (15.1 F)
1996
-13.3 C (8.1 F)
1997
-7.8 C (18.0 F)
1998
-5.0 C (23.0 F)
1999
-10.0 C (14.0 F)
2000
-9.4 C (15.1 F)
2001
-6.7 C (19.9 F)
2002
-7.2 C (19.0 F)
2003
-11.7 C (10.9 F)
2004
-7.8 C (18.0 F)
2005
-8.3 C (17.1 F)
2006
-6.1 C (21.0 F)
2007
-5.6 C (21.9 F)
2008
-7.8 C (18.0 F)
2009
-7.8 C (18.0 F)
2010
-8.3 C (17.1 F)
2011
-6.7 C (19.9 F)
Wettest day (Rx1day)
The wettest day of the year at Irwinton 4 WNW, 1956 to 2011. The record is 134.4 mm (5.3 in) in 1998, marked on the chart; the median year is 74.8 mm (2.9 in).
Wettest day (Rx1day) at Irwinton 4 WNW by year
Year
Wettest day (Rx1day)
1956
63.0 mm (2.5 in)
1957
15.2 mm (0.6 in)
1958
59.7 mm (2.4 in)
1965
53.1 mm (2.1 in)
1966
80.3 mm (3.2 in)
1967
45.7 mm (1.8 in)
1968
68.6 mm (2.7 in)
1969
58.4 mm (2.3 in)
1970
128.5 mm (5.1 in)
1971
80.3 mm (3.2 in)
1972
128.5 mm (5.1 in)
1973
51.1 mm (2.0 in)
1974
59.2 mm (2.3 in)
1975
78.7 mm (3.1 in)
1976
86.4 mm (3.4 in)
1977
112.8 mm (4.4 in)
1978
95.3 mm (3.8 in)
1979
84.8 mm (3.3 in)
1980
66.0 mm (2.6 in)
1981
99.1 mm (3.9 in)
1982
78.7 mm (3.1 in)
1983
101.6 mm (4.0 in)
1984
44.5 mm (1.8 in)
1985
81.3 mm (3.2 in)
1986
67.8 mm (2.7 in)
1987
63.5 mm (2.5 in)
1988
72.6 mm (2.9 in)
1989
64.3 mm (2.5 in)
1990
62.5 mm (2.5 in)
1991
102.9 mm (4.1 in)
1992
75.7 mm (3.0 in)
1993
91.4 mm (3.6 in)
1994
127.5 mm (5.0 in)
1995
95.5 mm (3.8 in)
1996
82.0 mm (3.2 in)
1997
66.5 mm (2.6 in)
1998
134.4 mm (5.3 in)
1999
55.9 mm (2.2 in)
2000
63.5 mm (2.5 in)
2001
102.4 mm (4.0 in)
2002
66.8 mm (2.6 in)
2003
94.0 mm (3.7 in)
2004
132.6 mm (5.2 in)
2005
91.2 mm (3.6 in)
2006
51.1 mm (2.0 in)
2007
73.9 mm (2.9 in)
2008
97.3 mm (3.8 in)
2009
66.0 mm (2.6 in)
2010
44.5 mm (1.8 in)
2011
34.3 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Irwinton 4 WNW, 1956 to 2011. The record is 193.6 mm (7.6 in) in 1970, marked on the chart; the median year is 114.3 mm (4.5 in).
Wettest five days (Rx5day) at Irwinton 4 WNW by year
Year
Wettest five days (Rx5day)
1956
95.7 mm (3.8 in)
1957
19.3 mm (0.8 in)
1958
106.5 mm (4.2 in)
1965
57.2 mm (2.3 in)
1966
149.2 mm (5.9 in)
1967
89.4 mm (3.5 in)
1968
93.5 mm (3.7 in)
1969
106.4 mm (4.2 in)
1970
193.6 mm (7.6 in)
1971
134.3 mm (5.3 in)
1972
128.8 mm (5.1 in)
1973
79.7 mm (3.1 in)
1974
87.7 mm (3.5 in)
1975
136.4 mm (5.4 in)
1976
122.4 mm (4.8 in)
1977
131.9 mm (5.2 in)
1978
111.8 mm (4.4 in)
1979
192.2 mm (7.6 in)
1980
104.1 mm (4.1 in)
1981
138.2 mm (5.4 in)
1982
168.9 mm (6.6 in)
1983
116.8 mm (4.6 in)
1984
102.9 mm (4.1 in)
1985
109.8 mm (4.3 in)
1986
106.2 mm (4.2 in)
1987
91.4 mm (3.6 in)
1988
100.5 mm (4.0 in)
1989
101.6 mm (4.0 in)
1990
86.9 mm (3.4 in)
1991
130.8 mm (5.1 in)
1992
102.4 mm (4.0 in)
1993
103.1 mm (4.1 in)
1994
130.5 mm (5.1 in)
1995
121.0 mm (4.8 in)
1996
126.4 mm (5.0 in)
1997
121.5 mm (4.8 in)
1998
145.6 mm (5.7 in)
1999
84.2 mm (3.3 in)
2000
75.9 mm (3.0 in)
2001
137.2 mm (5.4 in)
2002
132.9 mm (5.2 in)
2003
142.1 mm (5.6 in)
2004
178.2 mm (7.0 in)
2005
134.3 mm (5.3 in)
2006
107.5 mm (4.2 in)
2007
160.7 mm (6.3 in)
2008
123.5 mm (4.9 in)
2009
129.5 mm (5.1 in)
2010
73.9 mm (2.9 in)
2011
55.7 mm (2.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Irwinton 4 WNW, 1956 to 2011. The record is 44 days in 1978, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Irwinton 4 WNW by year
Year
Longest dry spell (CDD)
1956
21 days
1957
11 days
1958
12 days
1965
21 days
1966
15 days
1967
30 days
1968
30 days
1969
20 days
1970
27 days
1971
16 days
1972
22 days
1973
25 days
1974
19 days
1975
20 days
1976
30 days
1977
23 days
1978
44 days
1979
24 days
1980
21 days
1981
21 days
1982
18 days
1983
21 days
1984
22 days
1985
17 days
1986
30 days
1987
26 days
1988
27 days
1989
15 days
1990
34 days
1991
25 days
1992
24 days
1993
18 days
1994
16 days
1995
21 days
1996
24 days
1997
19 days
1998
25 days
1999
23 days
2000
34 days
2001
23 days
2002
27 days
2003
22 days
2004
20 days
2005
43 days
2006
21 days
2007
34 days
2008
23 days
2009
12 days
2010
20 days
2011
7 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
31 years with a frost
Across 31 years with a frost, the median last spring frost at Irwinton 4 WNW falls on 18 March and the median first autumn frost on 14 November, which leaves a median of 242 days between them.
Fitted over all years, the growing season changes by +3.4 days per decade at this station.
Frost dates and growing season at Irwinton 4 WNW
Measure
Median, all years
Earliest period
Recent period (1967 to 2008)
Recent against earliest
Fitted trend
Last spring frost
18 March
n/a
18 March
n/a
-0.5 days per decade
First autumn frost
14 November
n/a
15 November
n/a
+3.0 days per decade
Growing days
242 days
n/a
243 days
n/a
+3.4 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.
Rainfall Return Levels
40 years, 1966 to 2008
A day with at least 79.9 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 158.0 mm (6.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Irwinton 4 WNW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
79.9 mm (3.1 in)
5 years
102.2 mm (4.0 in)
10 years
116.4 mm (4.6 in)
25 years
133.7 mm (5.3 in)
50 years
146.1 mm (5.8 in)
Longer than the 40 years of record
100 years
158.0 mm (6.2 in)
Longer than the 40 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, 40 years of values from 1966 to 2008.
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: 134.4 mm (5.3 in) in 1998; 132.6 mm (5.2 in) in 2004; 128.5 mm (5.1 in) in 1970.
Download the Data
Data for Irwinton 4 WNW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Irwinton 4 WNW 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.