Record envelope, standing records and threshold days for Calhoun Exp STN (USC00091474), Georgia, United States, with 45 years of record.
Key Facts for Calhoun Exp STN
Calhoun Exp STN (USC00091474) is a weather station in Georgia, United States at 34.48 latitude and -84.97 longitude, 200 m (655 ft) above sea level.
The station reports from 1953 to 1997, 45 years of record.
1,464 records set at Calhoun Exp STN still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Calhoun Exp STN tied a daily record high minimum temperature of 12.8 C (55.0 F) on 28 February 1997.
About the Station
Location: Georgia, United States, 34.48 latitude, -84.97 longitude.
Elevation: 200 m (655 ft).
Period of record: 1953 to 1997, 45 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 Calhoun Exp STN. 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 Calhoun Exp STN, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
24.4 C (75.9 F)
-23.3 C (-9.9 F)
n/a
n/a
Feb
26.7 C (80.1 F)
-21.7 C (-7.1 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-15.6 C (3.9 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-5.6 C (21.9 F)
n/a
n/a
May
36.1 C (97.0 F)
0.6 C (33.1 F)
n/a
n/a
Jun
39.4 C (102.9 F)
4.4 C (39.9 F)
n/a
n/a
Jul
40.6 C (105.1 F)
10.0 C (50.0 F)
n/a
n/a
Aug
40.0 C (104.0 F)
8.3 C (46.9 F)
n/a
n/a
Sep
38.9 C (102.0 F)
0.0 C (32.0 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-6.7 C (19.9 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-11.1 C (12.0 F)
n/a
n/a
Dec
25.0 C (77.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Calhoun Exp STN still stand. 1954 holds the most, with 58.
Standing records at Calhoun Exp STN by the year they were set
Year set
Standing records
1953
38
1954
58
1955
33
1956
33
1957
35
1958
25
1959
26
1960
28
1961
29
1962
47
1963
43
1964
29
1965
13
1966
27
1967
46
1968
29
1969
21
1970
32
1971
32
1972
29
1973
28
1974
48
1975
24
1976
31
1977
56
1978
21
1979
41
1980
39
1981
36
1982
36
1983
45
1984
32
1985
50
1986
34
1987
25
1988
31
1989
40
1990
20
1991
29
1992
21
1993
39
1994
14
1995
35
1996
27
1997
9
All-Time Record Progression
6 new records
6 all-time records were set at Calhoun Exp STN between 21 January 1985 and 13 March 1993. Each dot is a new record.
When Calhoun Exp STN set new all-time records
Date
Kind
Detail
1985-01-21
Record low maximum temperature
Record low maximum temperature -13.3 C (8.1 F)
1985-01-21
Record low minimum temperature
Record low minimum temperature -23.3 C (-9.9 F)
1987-01-22
Record daily snowfall
Record daily snowfall 20.3 cm (8.0 in)
1987-01-22
Record snow depth
Record snow depth 20.3 cm (8.0 in)
1993-03-13
Record daily snowfall
Record daily snowfall 41.9 cm (16.5 in)
1993-03-13
Record snow depth
Record snow depth 33.0 cm (13.0 in)
Wettest Day of Each Month
Mar: 144.8 mm (5.7 in)
The wettest day on record for each calendar month at Calhoun Exp STN. The most was 144.8 mm (5.7 in) on 4 March 1979.
Record daily precipitation for each month at Calhoun Exp STN
Month
Record daily precipitation (mm)
Date
Jan
116.1 mm (4.6 in)
27 January 1996
Feb
118.4 mm (4.7 in)
16 February 1990
Mar
144.8 mm (5.7 in)
4 March 1979
Apr
114.3 mm (4.5 in)
11 April 1962
May
110.5 mm (4.4 in)
26 May 1968
Jun
87.9 mm (3.5 in)
10 June 1996
Jul
102.9 mm (4.1 in)
10 July 1967
Aug
95.3 mm (3.8 in)
21 August 1986
Sep
121.9 mm (4.8 in)
28 September 1963
Oct
108.0 mm (4.3 in)
4 October 1964
Nov
70.4 mm (2.8 in)
24 November 1983
Dec
105.4 mm (4.1 in)
12 December 1961
Period of Record Coverage
1953 to 1997
Complete yearUnder 90 percent of days
45 years of record at Calhoun Exp STN, 1953 to 1997. 2 years have data for under 90 percent of days and are left out of rankings: 1953, 1997.
Cooler than the station meanWarmer than the station mean
One stripe for each of 41 complete years at Calhoun Exp STN, 1954 to 1996. Blue stripes are years cooler than the station's own mean of 15.2 C (59.4 F); red stripes are warmer. The coolest year was 1979, at 14.3 C (57.7 F), and the warmest was 1957, at 16.3 C (61.4 F). The strongest colour marks a difference of 1.2 C (2.2 F).
Annual mean temperature at Calhoun Exp STN as warming stripes, 1954 to 1996
Year
Annual mean temperature
Difference from the station mean
1954
15.7 C
+0.52 C
1955
15.6 C
+0.42 C
1956
15.8 C
+0.55 C
1957
16.3 C
+1.10 C
1958
15.1 C
-0.16 C
1959
15.7 C
+0.43 C
1960
14.4 C
-0.81 C
1961
14.7 C
-0.49 C
1962
15.3 C
+0.06 C
1963
14.6 C
-0.66 C
1964
15.1 C
-0.14 C
1965
15.4 C
+0.16 C
1966
14.5 C
-0.75 C
1968
14.4 C
-0.83 C
1969
14.9 C
-0.37 C
1970
15.7 C
+0.43 C
1971
15.8 C
+0.62 C
1972
15.8 C
+0.56 C
1973
16.2 C
+0.93 C
1974
16.1 C
+0.88 C
1975
16.3 C
+1.08 C
1976
14.9 C
-0.35 C
1977
15.8 C
+0.60 C
1978
15.1 C
-0.10 C
1979
14.3 C
-0.96 C
1980
15.0 C
-0.23 C
1981
14.4 C
-0.79 C
1982
15.2 C
-0.06 C
1983
14.4 C
-0.81 C
1984
14.9 C
-0.32 C
1985
14.9 C
-0.32 C
1986
15.9 C
+0.67 C
1987
15.2 C
-0.05 C
1988
14.7 C
-0.57 C
1989
14.5 C
-0.70 C
1990
16.1 C
+0.88 C
1991
15.3 C
+0.11 C
1992
14.7 C
-0.54 C
1993
15.2 C
-0.06 C
1994
15.6 C
+0.38 C
1996
14.9 C
-0.33 C
The fitted trend in annual mean temperature here over 1954 to 1996 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Calhoun Exp STN
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.1) per decade
1954 to 1996
41
Not clearly different from zero
Mean daily maximum
-0.3 C (-0.4 to -0.1) per decade
-0.5 F (-0.8 to -0.2) per decade
1954 to 1996
41
Fall
Mean daily minimum
0.1 C (-0.1 to 0.3) per decade
0.2 F (-0.1 to 0.6) per decade
1954 to 1996
41
Not clearly different from zero
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
1953 to 1997
Yearly extremes at Calhoun Exp STN: 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)
1980
36.7 C (98.1 F)
45
Coldest night (TNn)
-23.3 C (-9.9 F)
1985
-13.3 C (8.1 F)
45
Wettest day (Rx1day)
144.8 mm (5.7 in)
1979
82.3 mm (3.2 in)
45
Wettest five days (Rx5day)
197.3 mm (7.8 in)
1995
124.2 mm (4.9 in)
45
Longest dry spell (CDD)
38 days
1988
19 days
45
Hottest day (TXx)
The hottest day of the year at Calhoun Exp STN, 1953 to 1997. The record is 40.6 C (105.1 F) in 1980, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Calhoun Exp STN by year
Year
Hottest day (TXx)
1953
37.8 C (100.0 F)
1954
38.9 C (102.0 F)
1955
36.1 C (97.0 F)
1956
38.9 C (102.0 F)
1957
38.3 C (100.9 F)
1958
37.2 C (99.0 F)
1959
35.0 C (95.0 F)
1960
35.6 C (96.1 F)
1961
34.4 C (93.9 F)
1962
36.1 C (97.0 F)
1963
37.2 C (99.0 F)
1964
38.3 C (100.9 F)
1965
35.6 C (96.1 F)
1966
38.3 C (100.9 F)
1967
33.9 C (93.0 F)
1968
38.9 C (102.0 F)
1969
37.8 C (100.0 F)
1970
37.8 C (100.0 F)
1971
37.2 C (99.0 F)
1972
35.0 C (95.0 F)
1973
35.0 C (95.0 F)
1974
35.6 C (96.1 F)
1975
36.7 C (98.1 F)
1976
35.6 C (96.1 F)
1977
39.4 C (102.9 F)
1978
36.7 C (98.1 F)
1979
34.4 C (93.9 F)
1980
40.6 C (105.1 F)
1981
37.2 C (99.0 F)
1982
34.4 C (93.9 F)
1983
40.0 C (104.0 F)
1984
36.1 C (97.0 F)
1985
36.1 C (97.0 F)
1986
38.9 C (102.0 F)
1987
37.8 C (100.0 F)
1988
39.4 C (102.9 F)
1989
35.0 C (95.0 F)
1990
37.8 C (100.0 F)
1991
35.6 C (96.1 F)
1992
35.0 C (95.0 F)
1993
40.0 C (104.0 F)
1994
35.0 C (95.0 F)
1995
37.8 C (100.0 F)
1996
36.1 C (97.0 F)
1997
23.9 C (75.0 F)
Coldest night (TNn)
The coldest night of the year at Calhoun Exp STN, 1953 to 1997. The record is -23.3 C (-9.9 F) in 1985, marked on the chart; the median year is -13.3 C (8.1 F).
Coldest night (TNn) at Calhoun Exp STN by year
Year
Coldest night (TNn)
1953
-12.8 C (9.0 F)
1954
-10.0 C (14.0 F)
1955
-11.1 C (12.0 F)
1956
-8.3 C (17.1 F)
1957
-12.8 C (9.0 F)
1958
-17.8 C (0.0 F)
1959
-13.3 C (8.1 F)
1960
-13.9 C (7.0 F)
1961
-13.9 C (7.0 F)
1962
-18.3 C (-0.9 F)
1963
-20.6 C (-5.1 F)
1964
-15.0 C (5.0 F)
1965
-13.9 C (7.0 F)
1966
-21.7 C (-7.1 F)
1967
-15.0 C (5.0 F)
1968
-12.8 C (9.0 F)
1969
-13.3 C (8.1 F)
1970
-18.9 C (-2.0 F)
1971
-12.8 C (9.0 F)
1972
-16.7 C (1.9 F)
1973
-11.1 C (12.0 F)
1974
-7.8 C (18.0 F)
1975
-11.1 C (12.0 F)
1976
-13.3 C (8.1 F)
1977
-18.3 C (-0.9 F)
1978
-13.3 C (8.1 F)
1979
-12.2 C (10.0 F)
1980
-12.2 C (10.0 F)
1981
-13.3 C (8.1 F)
1982
-20.0 C (-4.0 F)
1983
-18.9 C (-2.0 F)
1984
-13.3 C (8.1 F)
1985
-23.3 C (-9.9 F)
1986
-15.6 C (3.9 F)
1987
-10.0 C (14.0 F)
1988
-12.8 C (9.0 F)
1989
-16.1 C (3.0 F)
1990
-8.9 C (16.0 F)
1991
-12.8 C (9.0 F)
1992
-10.6 C (12.9 F)
1993
-15.6 C (3.9 F)
1994
-16.1 C (3.0 F)
1995
-12.2 C (10.0 F)
1996
-16.7 C (1.9 F)
1997
-12.8 C (9.0 F)
Wettest day (Rx1day)
The wettest day of the year at Calhoun Exp STN, 1953 to 1997. The record is 144.8 mm (5.7 in) in 1979, marked on the chart; the median year is 82.3 mm (3.2 in).
Wettest day (Rx1day) at Calhoun Exp STN by year
Year
Wettest day (Rx1day)
1953
66.0 mm (2.6 in)
1954
84.8 mm (3.3 in)
1955
104.1 mm (4.1 in)
1956
57.2 mm (2.3 in)
1957
86.4 mm (3.4 in)
1958
57.2 mm (2.3 in)
1959
57.2 mm (2.3 in)
1960
78.7 mm (3.1 in)
1961
105.4 mm (4.1 in)
1962
114.3 mm (4.5 in)
1963
121.9 mm (4.8 in)
1964
108.0 mm (4.3 in)
1965
78.7 mm (3.1 in)
1966
76.2 mm (3.0 in)
1967
102.9 mm (4.1 in)
1968
110.5 mm (4.4 in)
1969
88.9 mm (3.5 in)
1970
74.9 mm (2.9 in)
1971
63.5 mm (2.5 in)
1972
99.1 mm (3.9 in)
1973
98.6 mm (3.9 in)
1974
41.7 mm (1.6 in)
1975
86.4 mm (3.4 in)
1976
82.3 mm (3.2 in)
1977
71.4 mm (2.8 in)
1978
51.6 mm (2.0 in)
1979
144.8 mm (5.7 in)
1980
89.2 mm (3.5 in)
1981
62.5 mm (2.5 in)
1982
107.2 mm (4.2 in)
1983
70.4 mm (2.8 in)
1984
77.0 mm (3.0 in)
1985
51.6 mm (2.0 in)
1986
95.3 mm (3.8 in)
1987
85.6 mm (3.4 in)
1988
72.4 mm (2.9 in)
1989
69.3 mm (2.7 in)
1990
118.4 mm (4.7 in)
1991
73.9 mm (2.9 in)
1992
51.3 mm (2.0 in)
1993
46.5 mm (1.8 in)
1994
75.2 mm (3.0 in)
1995
103.1 mm (4.1 in)
1996
116.1 mm (4.6 in)
1997
88.4 mm (3.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Calhoun Exp STN, 1953 to 1997. The record is 197.3 mm (7.8 in) in 1995, marked on the chart; the median year is 124.2 mm (4.9 in).
Wettest five days (Rx5day) at Calhoun Exp STN by year
Year
Wettest five days (Rx5day)
1953
115.5 mm (4.5 in)
1954
111.5 mm (4.4 in)
1955
124.2 mm (4.9 in)
1956
97.0 mm (3.8 in)
1957
142.6 mm (5.6 in)
1958
97.3 mm (3.8 in)
1959
75.2 mm (3.0 in)
1960
126.2 mm (5.0 in)
1961
184.1 mm (7.2 in)
1962
144.8 mm (5.7 in)
1963
170.4 mm (6.7 in)
1964
132.6 mm (5.2 in)
1965
132.1 mm (5.2 in)
1966
130.8 mm (5.1 in)
1967
175.1 mm (6.9 in)
1968
119.9 mm (4.7 in)
1969
118.2 mm (4.7 in)
1970
118.1 mm (4.6 in)
1971
98.6 mm (3.9 in)
1972
131.4 mm (5.2 in)
1973
153.4 mm (6.0 in)
1974
83.3 mm (3.3 in)
1975
93.3 mm (3.7 in)
1976
130.8 mm (5.1 in)
1977
136.7 mm (5.4 in)
1978
80.7 mm (3.2 in)
1979
152.6 mm (6.0 in)
1980
139.4 mm (5.5 in)
1981
92.7 mm (3.6 in)
1982
180.3 mm (7.1 in)
1983
118.4 mm (4.7 in)
1984
194.8 mm (7.7 in)
1985
97.8 mm (3.9 in)
1986
101.4 mm (4.0 in)
1987
107.6 mm (4.2 in)
1988
88.2 mm (3.5 in)
1989
151.6 mm (6.0 in)
1990
154.4 mm (6.1 in)
1991
109.2 mm (4.3 in)
1992
106.7 mm (4.2 in)
1993
69.2 mm (2.7 in)
1994
153.7 mm (6.1 in)
1995
197.3 mm (7.8 in)
1996
150.9 mm (5.9 in)
1997
88.4 mm (3.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Calhoun Exp STN, 1953 to 1997. The record is 38 days in 1988, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Calhoun Exp STN by year
Year
Longest dry spell (CDD)
1953
29 days
1954
14 days
1955
24 days
1956
24 days
1957
19 days
1958
30 days
1959
21 days
1960
18 days
1961
30 days
1962
20 days
1963
19 days
1964
32 days
1965
19 days
1966
31 days
1967
31 days
1968
27 days
1969
17 days
1970
20 days
1971
15 days
1972
13 days
1973
21 days
1974
19 days
1975
11 days
1976
18 days
1977
18 days
1978
37 days
1979
12 days
1980
18 days
1981
23 days
1982
12 days
1983
19 days
1984
18 days
1985
18 days
1986
26 days
1987
26 days
1988
38 days
1989
17 days
1990
21 days
1991
16 days
1992
19 days
1993
17 days
1994
16 days
1995
18 days
1996
20 days
1997
6 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
41 years with a frost
Across 41 years with a frost, the median last spring frost at Calhoun Exp STN falls on 11 April and the median first autumn frost on 24 October, which leaves a median of 197 days between them.
Fitted over all years, the growing season changes by -2.3 days per decade at this station.
Frost dates and growing season at Calhoun Exp STN
Measure
Median, all years
Earliest period
Recent period (1965 to 1996)
Recent against earliest
Fitted trend
Last spring frost
11 April
n/a
11 April
n/a
+1.0 days per decade
First autumn frost
24 October
n/a
20 October
n/a
-1.3 days per decade
Growing days
197 days
n/a
194 days
n/a
-2.3 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
43 years, 1954 to 1996
A day with at least 82.7 mm (3.3 in) of rain is expected about once in 2 years. A day with at least 142.5 mm (5.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Calhoun Exp STN: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
82.7 mm (3.3 in)
5 years
104.0 mm (4.1 in)
10 years
115.6 mm (4.6 in)
25 years
128.0 mm (5.0 in)
50 years
135.8 mm (5.3 in)
Longer than the 43 years of record
100 years
142.5 mm (5.6 in)
Longer than the 43 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, 43 years of values from 1954 to 1996.
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: 144.8 mm (5.7 in) in 1979; 121.9 mm (4.8 in) in 1963; 118.4 mm (4.7 in) in 1990.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Calhoun Exp STN, at 1969 and 1979. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1969 ran 0.5 C (0.8 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1979 ran 0.3 C (0.5 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Calhoun Exp STN, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1969
+0.5
+0.8
likely
5
1979
-0.3
-0.5
possible
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Calhoun Exp STN standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Calhoun Exp STN 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.