Record envelope, standing records and threshold days for Markland Dam 39 (USC00125381), Indiana, United States, with 59 years of record.
Key Facts for Markland Dam 39
Markland Dam 39 (USC00125381) is a weather station in Indiana, United States at 38.78 latitude and -84.97 longitude, 146 m (479 ft) above sea level.
The station reports from 1901 to 1959, 59 years of record.
1,464 records set at Markland Dam 39 still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Markland Dam 39 set a daily record low maximum temperature of -2.8 C (27.0 F) on 29 November 1959.
About the Station
Location: Indiana, United States, 38.78 latitude, -84.97 longitude.
Elevation: 146 m (479 ft).
Period of record: 1901 to 1959, 59 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 Markland Dam 39. 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 Markland Dam 39, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
25.0 C (77.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Feb
25.0 C (77.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Mar
30.6 C (87.1 F)
-17.2 C (1.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-8.3 C (17.1 F)
n/a
n/a
May
37.2 C (99.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jun
38.3 C (100.9 F)
3.3 C (37.9 F)
n/a
n/a
Jul
42.8 C (109.0 F)
8.9 C (48.0 F)
n/a
n/a
Aug
39.4 C (102.9 F)
6.7 C (44.1 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-2.8 C (27.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-7.8 C (18.0 F)
n/a
n/a
Nov
30.0 C (86.0 F)
-17.8 C (0.0 F)
n/a
n/a
Dec
22.8 C (73.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Markland Dam 39 still stand. 1918 holds the most, with 58.
Standing records at Markland Dam 39 by the year they were set
Year set
Standing records
1901
26
1902
24
1903
25
1904
15
1905
26
1906
49
1907
18
1908
19
1909
33
1910
22
1911
45
1912
28
1913
45
1914
29
1915
23
1916
25
1917
44
1918
58
1919
27
1920
12
1921
10
1922
20
1923
23
1924
23
1925
35
1926
18
1927
49
1928
26
1929
35
1930
42
1931
17
1932
33
1933
19
1934
38
1935
18
1936
43
1937
20
1938
12
1939
14
1940
39
1941
18
1942
21
1943
15
1944
12
1945
15
1946
20
1947
20
1948
16
1949
12
1950
27
1951
20
1952
19
1953
17
1954
25
1955
15
1956
15
1957
12
1958
17
1959
21
All-Time Record Progression
3 new records
3 all-time records were set at Markland Dam 39 between 3 August 1932 and 25 July 1934. Each dot is a new record.
When Markland Dam 39 set new all-time records
Date
Kind
Detail
1932-08-03
Record daily precipitation
Record daily precipitation 152.4 mm (6.0 in)
1934-07-21
Record high maximum temperature
Record high maximum temperature 41.7 C (107.1 F)
1934-07-25
Record high maximum temperature
Record high maximum temperature 42.8 C (109.0 F)
Wettest Day of Each Month
Aug: 152.4 mm (6.0 in)
The wettest day on record for each calendar month at Markland Dam 39. The most was 152.4 mm (6.0 in) on 3 August 1932.
Record daily precipitation for each month at Markland Dam 39
Month
Record daily precipitation (mm)
Date
Jan
76.2 mm (3.0 in)
22 January 1937
Feb
91.4 mm (3.6 in)
5 February 1908
Mar
106.7 mm (4.2 in)
9 March 1909
Apr
101.6 mm (4.0 in)
18 April 1939
May
97.8 mm (3.9 in)
23 May 1902
Jun
66.0 mm (2.6 in)
2 June 1932
Jul
101.6 mm (4.0 in)
5 July 1957
Aug
152.4 mm (6.0 in)
3 August 1932
Sep
85.1 mm (3.4 in)
7 September 1915
Oct
123.2 mm (4.9 in)
6 October 1910
Nov
90.2 mm (3.6 in)
6 November 1948
Dec
118.1 mm (4.6 in)
24 December 1921
Period of Record Coverage
1901 to 1959
Complete yearUnder 90 percent of days
59 years of record at Markland Dam 39, 1901 to 1959. 6 years have data for under 90 percent of days and are left out of rankings: 1907, 1912, 1919, 1920, 1921, 1922.
Cooler than the station meanWarmer than the station mean
One stripe for each of 53 complete years at Markland Dam 39, 1901 to 1959. Blue stripes are years cooler than the station's own mean of 13.0 C (55.3 F); red stripes are warmer. The coolest year was 1958, at 11.1 C (52.0 F), and the warmest was 1911, at 14.4 C (58.0 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Markland Dam 39 as warming stripes, 1901 to 1959
Year
Annual mean temperature
Difference from the station mean
1901
12.7 C
-0.26 C
1902
13.0 C
+0.03 C
1903
12.6 C
-0.36 C
1904
12.1 C
-0.85 C
1905
12.7 C
-0.27 C
1906
13.2 C
+0.24 C
1908
13.9 C
+0.91 C
1909
13.2 C
+0.26 C
1910
12.7 C
-0.25 C
1911
14.4 C
+1.48 C
1913
14.3 C
+1.35 C
1914
13.5 C
+0.52 C
1915
13.5 C
+0.53 C
1916
13.6 C
+0.66 C
1917
11.6 C
-1.35 C
1918
13.1 C
+0.09 C
1923
13.1 C
+0.16 C
1924
11.9 C
-1.04 C
1925
13.5 C
+0.54 C
1926
13.0 C
+0.08 C
1927
12.4 C
-0.61 C
1928
11.8 C
-1.12 C
1929
11.7 C
-1.23 C
1930
13.4 C
+0.44 C
1931
14.1 C
+1.13 C
1932
13.2 C
+0.20 C
1933
13.6 C
+0.66 C
1934
13.1 C
+0.09 C
1935
12.5 C
-0.49 C
1936
12.8 C
-0.15 C
1937
12.5 C
-0.44 C
1938
14.0 C
+1.05 C
1939
13.7 C
+0.73 C
1940
12.3 C
-0.64 C
1941
13.8 C
+0.83 C
1942
13.2 C
+0.27 C
1943
12.9 C
-0.10 C
1944
13.1 C
+0.11 C
1945
12.6 C
-0.38 C
1946
13.8 C
+0.84 C
1947
12.5 C
-0.42 C
1948
13.1 C
+0.15 C
1949
13.3 C
+0.32 C
1950
11.6 C
-1.36 C
1951
12.1 C
-0.84 C
1952
12.8 C
-0.18 C
1953
13.3 C
+0.33 C
1954
13.3 C
+0.32 C
1955
13.1 C
+0.12 C
1956
12.7 C
-0.31 C
1957
12.7 C
-0.30 C
1958
11.1 C
-1.87 C
1959
13.6 C
+0.60 C
The fitted trend in annual mean temperature here over 1901 to 1959 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 (-0.3 to 0.1) per decade. The slope is a straight line fitted to 53 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Markland Dam 39
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 (-0.3 to 0.1) per decade
1901 to 1959
53
Not clearly different from zero
Mean daily maximum
0.10 C (-0.04 to 0.24) per decade
0.2 F (-0.1 to 0.4) per decade
1901 to 1959
53
Not clearly different from zero
Mean daily minimum
-0.2 C (-0.3 to -0.1) per decade
-0.4 F (-0.6 to -0.1) per decade
1901 to 1959
53
Fall
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
1901 to 1959
Yearly extremes at Markland Dam 39: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.8 C (109.0 F)
1934
36.7 C (98.1 F)
59
Coldest night (TNn)
-31.1 C (-24.0 F)
1918
-18.9 C (-2.0 F)
59
Wettest day (Rx1day)
152.4 mm (6.0 in)
1932
63.5 mm (2.5 in)
59
Wettest five days (Rx5day)
214.4 mm (8.4 in)
1937
107.5 mm (4.2 in)
59
Longest dry spell (CDD)
32 days
1924
19 days
59
Hottest day (TXx)
The hottest day of the year at Markland Dam 39, 1901 to 1959. The record is 42.8 C (109.0 F) in 1934, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Markland Dam 39 by year
Year
Hottest day (TXx)
1901
40.6 C (105.1 F)
1902
35.0 C (95.0 F)
1903
36.1 C (97.0 F)
1904
34.4 C (93.9 F)
1905
35.6 C (96.1 F)
1906
35.0 C (95.0 F)
1907
35.0 C (95.0 F)
1908
36.7 C (98.1 F)
1909
35.6 C (96.1 F)
1910
35.0 C (95.0 F)
1911
38.9 C (102.0 F)
1912
36.7 C (98.1 F)
1913
38.9 C (102.0 F)
1914
40.0 C (104.0 F)
1915
36.7 C (98.1 F)
1916
36.1 C (97.0 F)
1917
36.1 C (97.0 F)
1918
37.8 C (100.0 F)
1919
36.7 C (98.1 F)
1920
35.6 C (96.1 F)
1921
37.8 C (100.0 F)
1922
36.1 C (97.0 F)
1923
35.6 C (96.1 F)
1924
35.6 C (96.1 F)
1925
37.8 C (100.0 F)
1926
37.2 C (99.0 F)
1927
37.2 C (99.0 F)
1928
33.9 C (93.0 F)
1929
35.6 C (96.1 F)
1930
41.1 C (106.0 F)
1931
38.3 C (100.9 F)
1932
36.1 C (97.0 F)
1933
37.8 C (100.0 F)
1934
42.8 C (109.0 F)
1935
35.6 C (96.1 F)
1936
40.6 C (105.1 F)
1937
34.4 C (93.9 F)
1938
36.1 C (97.0 F)
1939
37.2 C (99.0 F)
1940
38.3 C (100.9 F)
1941
36.7 C (98.1 F)
1942
37.2 C (99.0 F)
1943
36.7 C (98.1 F)
1944
37.8 C (100.0 F)
1945
36.1 C (97.0 F)
1946
34.4 C (93.9 F)
1947
36.1 C (97.0 F)
1948
37.2 C (99.0 F)
1949
34.4 C (93.9 F)
1950
32.2 C (90.0 F)
1951
39.4 C (102.9 F)
1952
38.9 C (102.0 F)
1953
39.4 C (102.9 F)
1954
40.6 C (105.1 F)
1955
38.9 C (102.0 F)
1956
35.6 C (96.1 F)
1957
35.6 C (96.1 F)
1958
35.6 C (96.1 F)
1959
37.2 C (99.0 F)
Coldest night (TNn)
The coldest night of the year at Markland Dam 39, 1901 to 1959. The record is -31.1 C (-24.0 F) in 1918, marked on the chart; the median year is -18.9 C (-2.0 F).
Coldest night (TNn) at Markland Dam 39 by year
Year
Coldest night (TNn)
1901
-20.6 C (-5.1 F)
1902
-16.1 C (3.0 F)
1903
-20.6 C (-5.1 F)
1904
-20.0 C (-4.0 F)
1905
-20.6 C (-5.1 F)
1906
-22.8 C (-9.0 F)
1907
-18.3 C (-0.9 F)
1908
-15.6 C (3.9 F)
1909
-18.9 C (-2.0 F)
1910
-20.0 C (-4.0 F)
1911
-13.3 C (8.1 F)
1912
-25.0 C (-13.0 F)
1913
-18.3 C (-0.9 F)
1914
-19.4 C (-2.9 F)
1915
-16.7 C (1.9 F)
1916
-18.9 C (-2.0 F)
1917
-28.9 C (-20.0 F)
1918
-31.1 C (-24.0 F)
1919
-16.1 C (3.0 F)
1920
-10.0 C (14.0 F)
1921
-5.6 C (21.9 F)
1922
-13.3 C (8.1 F)
1923
-15.6 C (3.9 F)
1924
-21.1 C (-6.0 F)
1925
-20.0 C (-4.0 F)
1926
-21.1 C (-6.0 F)
1927
-18.9 C (-2.0 F)
1928
-20.0 C (-4.0 F)
1929
-21.1 C (-6.0 F)
1930
-23.3 C (-9.9 F)
1931
-11.7 C (10.9 F)
1932
-22.8 C (-9.0 F)
1933
-21.1 C (-6.0 F)
1934
-24.4 C (-11.9 F)
1935
-23.3 C (-9.9 F)
1936
-26.1 C (-15.0 F)
1937
-14.4 C (6.1 F)
1938
-15.6 C (3.9 F)
1939
-13.9 C (7.0 F)
1940
-23.9 C (-11.0 F)
1941
-14.4 C (6.1 F)
1942
-23.9 C (-11.0 F)
1943
-17.2 C (1.0 F)
1944
-17.2 C (1.0 F)
1945
-19.4 C (-2.9 F)
1946
-14.4 C (6.1 F)
1947
-16.1 C (3.0 F)
1948
-23.3 C (-9.9 F)
1949
-12.8 C (9.0 F)
1950
-16.7 C (1.9 F)
1951
-26.1 C (-15.0 F)
1952
-13.3 C (8.1 F)
1953
-15.0 C (5.0 F)
1954
-16.1 C (3.0 F)
1955
-17.8 C (0.0 F)
1956
-15.0 C (5.0 F)
1957
-20.0 C (-4.0 F)
1958
-18.3 C (-0.9 F)
1959
-18.9 C (-2.0 F)
Wettest day (Rx1day)
The wettest day of the year at Markland Dam 39, 1901 to 1959. The record is 152.4 mm (6.0 in) in 1932, marked on the chart; the median year is 63.5 mm (2.5 in).
Wettest day (Rx1day) at Markland Dam 39 by year
Year
Wettest day (Rx1day)
1901
50.8 mm (2.0 in)
1902
97.8 mm (3.9 in)
1903
54.6 mm (2.1 in)
1904
69.9 mm (2.8 in)
1905
48.3 mm (1.9 in)
1906
88.9 mm (3.5 in)
1907
69.9 mm (2.8 in)
1908
91.4 mm (3.6 in)
1909
106.7 mm (4.2 in)
1910
123.2 mm (4.9 in)
1911
81.3 mm (3.2 in)
1912
71.1 mm (2.8 in)
1913
92.7 mm (3.6 in)
1914
92.7 mm (3.6 in)
1915
85.1 mm (3.4 in)
1916
58.4 mm (2.3 in)
1917
88.9 mm (3.5 in)
1918
52.1 mm (2.1 in)
1919
56.9 mm (2.2 in)
1920
76.2 mm (3.0 in)
1921
118.1 mm (4.6 in)
1922
39.4 mm (1.6 in)
1923
53.3 mm (2.1 in)
1924
58.4 mm (2.3 in)
1925
50.8 mm (2.0 in)
1926
61.0 mm (2.4 in)
1927
52.6 mm (2.1 in)
1928
64.3 mm (2.5 in)
1929
50.8 mm (2.0 in)
1930
41.9 mm (1.6 in)
1931
57.2 mm (2.3 in)
1932
152.4 mm (6.0 in)
1933
76.2 mm (3.0 in)
1934
76.2 mm (3.0 in)
1935
63.5 mm (2.5 in)
1936
48.5 mm (1.9 in)
1937
76.2 mm (3.0 in)
1938
52.1 mm (2.1 in)
1939
101.6 mm (4.0 in)
1940
60.7 mm (2.4 in)
1941
65.5 mm (2.6 in)
1942
49.3 mm (1.9 in)
1943
68.6 mm (2.7 in)
1944
50.0 mm (2.0 in)
1945
56.9 mm (2.2 in)
1946
73.4 mm (2.9 in)
1947
43.9 mm (1.7 in)
1948
90.2 mm (3.6 in)
1949
70.9 mm (2.8 in)
1950
63.2 mm (2.5 in)
1951
53.3 mm (2.1 in)
1952
52.3 mm (2.1 in)
1953
43.7 mm (1.7 in)
1954
47.8 mm (1.9 in)
1955
80.5 mm (3.2 in)
1956
90.2 mm (3.6 in)
1957
101.6 mm (4.0 in)
1958
53.3 mm (2.1 in)
1959
43.2 mm (1.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Markland Dam 39, 1901 to 1959. The record is 214.4 mm (8.4 in) in 1937, marked on the chart; the median year is 107.5 mm (4.2 in).
Wettest five days (Rx5day) at Markland Dam 39 by year
Year
Wettest five days (Rx5day)
1901
72.5 mm (2.9 in)
1902
123.3 mm (4.9 in)
1903
67.4 mm (2.7 in)
1904
138.5 mm (5.5 in)
1905
96.6 mm (3.8 in)
1906
101.6 mm (4.0 in)
1907
127.9 mm (5.0 in)
1908
172.8 mm (6.8 in)
1909
123.2 mm (4.9 in)
1910
151.2 mm (6.0 in)
1911
153.7 mm (6.1 in)
1912
129.5 mm (5.1 in)
1913
189.2 mm (7.4 in)
1914
99.1 mm (3.9 in)
1915
125.0 mm (4.9 in)
1916
90.1 mm (3.5 in)
1917
141.0 mm (5.6 in)
1918
87.7 mm (3.5 in)
1919
128.6 mm (5.1 in)
1920
134.7 mm (5.3 in)
1921
143.5 mm (5.6 in)
1922
60.7 mm (2.4 in)
1923
92.7 mm (3.6 in)
1924
87.9 mm (3.5 in)
1925
81.1 mm (3.2 in)
1926
140.3 mm (5.5 in)
1927
117.2 mm (4.6 in)
1928
108.3 mm (4.3 in)
1929
69.1 mm (2.7 in)
1930
58.4 mm (2.3 in)
1931
80.1 mm (3.2 in)
1932
166.4 mm (6.6 in)
1933
130.9 mm (5.2 in)
1934
96.5 mm (3.8 in)
1935
97.8 mm (3.9 in)
1936
69.8 mm (2.7 in)
1937
214.4 mm (8.4 in)
1938
107.5 mm (4.2 in)
1939
146.1 mm (5.8 in)
1940
125.3 mm (4.9 in)
1941
107.5 mm (4.2 in)
1942
77.4 mm (3.0 in)
1943
113.5 mm (4.5 in)
1944
96.2 mm (3.8 in)
1945
135.6 mm (5.3 in)
1946
125.0 mm (4.9 in)
1947
64.7 mm (2.5 in)
1948
126.2 mm (5.0 in)
1949
130.3 mm (5.1 in)
1950
112.3 mm (4.4 in)
1951
65.6 mm (2.6 in)
1952
63.5 mm (2.5 in)
1953
53.0 mm (2.1 in)
1954
99.9 mm (3.9 in)
1955
93.9 mm (3.7 in)
1956
106.2 mm (4.2 in)
1957
103.1 mm (4.1 in)
1958
106.4 mm (4.2 in)
1959
94.3 mm (3.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Markland Dam 39, 1901 to 1959. The record is 32 days in 1924, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Markland Dam 39 by year
Year
Longest dry spell (CDD)
1901
23 days
1902
21 days
1903
19 days
1904
22 days
1905
13 days
1906
20 days
1907
18 days
1908
26 days
1909
16 days
1910
16 days
1911
20 days
1912
17 days
1913
16 days
1914
21 days
1915
20 days
1916
20 days
1917
28 days
1918
25 days
1919
20 days
1920
20 days
1921
22 days
1922
21 days
1923
19 days
1924
32 days
1925
19 days
1926
13 days
1927
18 days
1928
20 days
1929
19 days
1930
21 days
1931
18 days
1932
15 days
1933
26 days
1934
19 days
1935
19 days
1936
26 days
1937
17 days
1938
27 days
1939
15 days
1940
14 days
1941
21 days
1942
18 days
1943
19 days
1944
28 days
1945
19 days
1946
16 days
1947
25 days
1948
19 days
1949
15 days
1950
12 days
1951
16 days
1952
28 days
1953
27 days
1954
13 days
1955
25 days
1956
19 days
1957
25 days
1958
26 days
1959
16 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
53 years with a frost
Across 53 years with a frost, the median last spring frost at Markland Dam 39 falls on 22 April and the median first autumn frost on 25 October, which leaves a median of 188 days between them.
Fitted over all years, the growing season changes by +0.5 days per decade at this station.
Frost dates and growing season at Markland Dam 39
Measure
Median, all years
Earliest period
Recent period (1930 to 1959)
Recent against earliest
Fitted trend
Last spring frost
22 April
n/a
22 April
n/a
-0.2 days per decade
First autumn frost
25 October
n/a
26 October
n/a
+0.3 days per decade
Growing days
188 days
n/a
190 days
n/a
+0.5 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
59 years, 1901 to 1959
A day with at least 64.5 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 153.7 mm (6.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Markland Dam 39: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
64.5 mm (2.5 in)
5 years
84.6 mm (3.3 in)
10 years
99.2 mm (3.9 in)
25 years
119.6 mm (4.7 in)
50 years
136.0 mm (5.4 in)
100 years
153.7 mm (6.1 in)
Longer than the 59 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, 59 years of values from 1901 to 1959.
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: 152.4 mm (6.0 in) in 1932; 123.2 mm (4.9 in) in 1910; 118.1 mm (4.6 in) in 1921.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Markland Dam 39, at 1927 and 1936. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1927 ran 0.6 C (1.1 F) lower than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1936 ran 0.4 C (0.7 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Markland Dam 39, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1927
-0.6
-1.1
possible
5
1936
+0.4
+0.7
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 Markland Dam 39 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Markland Dam 39 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.