Record envelope, standing records and threshold days for Middle Dam (USC00175261), Maine, United States, with 88 years of record.
Key Facts for Middle Dam
Middle Dam (USC00175261) is a weather station in Maine, United States at 44.78 latitude and -70.92 longitude, 445 m (1,460 ft) above sea level.
The station reports from 1926 to 2013, 88 years of record.
1,464 records set at Middle Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Middle Dam tied a daily record high minimum temperature of 15.0 C (59.0 F) on 13 September 2013.
About the Station
Location: Maine, United States, 44.78 latitude, -70.92 longitude.
Elevation: 445 m (1,460 ft).
Period of record: 1926 to 2013, 88 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 Middle Dam. 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 Middle Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.0 C (59.0 F)
-36.7 C (-34.1 F)
n/a
n/a
Feb
17.2 C (63.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-33.3 C (-27.9 F)
n/a
n/a
Apr
30.0 C (86.0 F)
-23.3 C (-9.9 F)
n/a
n/a
May
32.2 C (90.0 F)
-8.9 C (16.0 F)
n/a
n/a
Jun
34.4 C (93.9 F)
-2.2 C (28.0 F)
n/a
n/a
Jul
34.4 C (93.9 F)
0.0 C (32.0 F)
n/a
n/a
Aug
35.6 C (96.1 F)
-1.7 C (28.9 F)
n/a
n/a
Sep
33.3 C (91.9 F)
-7.2 C (19.0 F)
n/a
n/a
Oct
27.2 C (81.0 F)
-11.1 C (12.0 F)
n/a
n/a
Nov
21.1 C (70.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-33.3 C (-27.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Middle Dam still stand. 1979 holds the most, with 46.
Standing records at Middle Dam by the year they were set
Year set
Standing records
1926
13
1927
19
1928
15
1930
2
1931
2
1932
31
1933
21
1934
32
1935
20
1936
27
1937
25
1938
25
1939
15
1940
15
1941
23
1942
19
1943
14
1944
22
1945
23
1946
27
1947
28
1948
4
1961
10
1962
23
1963
33
1964
35
1965
31
1966
39
1967
22
1968
27
1969
30
1970
29
1971
25
1972
24
1973
23
1974
33
1975
29
1976
43
1977
18
1978
18
1979
46
1980
12
1981
22
1982
12
1983
9
1984
13
1985
13
1986
15
1987
20
1988
14
1989
33
1990
24
1991
14
1992
19
1993
21
1994
17
1995
16
1996
10
1997
6
1998
14
1999
7
2000
12
2001
19
2002
21
2003
15
2004
14
2005
14
2006
15
2007
12
2008
15
2009
12
2010
14
2011
7
2012
17
2013
6
All-Time Record Progression
2 new records
2 all-time records were set at Middle Dam between 3 August 1975 and 11 January 1976. Each dot is a new record.
When Middle Dam set new all-time records
Date
Kind
Detail
1975-08-03
Record high maximum temperature
Record high maximum temperature 35.6 C (96.1 F)
1976-01-11
Record low minimum temperature
Record low minimum temperature -36.7 C (-34.1 F)
Wettest Day of Each Month
Nov: 116.3 mm (4.6 in)
The wettest day on record for each calendar month at Middle Dam. The most was 116.3 mm (4.6 in) on 4 November 1927.
Record daily precipitation for each month at Middle Dam
Month
Record daily precipitation (mm)
Date
Jan
46.2 mm (1.8 in)
27 January 1986
Feb
44.7 mm (1.8 in)
25 February 1998
Mar
58.4 mm (2.3 in)
18 March 1936
Apr
59.7 mm (2.4 in)
12 April 1934
May
67.1 mm (2.6 in)
28 May 2011
Jun
96.5 mm (3.8 in)
15 June 1942
Jul
70.6 mm (2.8 in)
28 July 1938
Aug
96.8 mm (3.8 in)
20 August 1991
Sep
81.8 mm (3.2 in)
11 September 1954
Oct
81.3 mm (3.2 in)
22 October 1995
Nov
116.3 mm (4.6 in)
4 November 1927
Dec
58.4 mm (2.3 in)
13 December 2010
Period of Record Coverage
1926 to 2013
Complete yearUnder 90 percent of days
76 years of record at Middle Dam, 1926 to 2013. 14 years have data for under 90 percent of days and are left out of rankings: 1926, 1927, 1928, 1930, 1931, 1935, 1948, 1950 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 58 complete years at Middle Dam, 1932 to 2012. Blue stripes are years cooler than the station's own mean of 4.1 C (39.4 F); red stripes are warmer. The coolest year was 1965, at 2.4 C (36.2 F), and the warmest was 2012, at 6.0 C (42.8 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Middle Dam as warming stripes, 1932 to 2012
Year
Annual mean temperature
Difference from the station mean
1932
5.7 C
+1.56 C
1933
4.9 C
+0.84 C
1936
4.9 C
+0.85 C
1937
5.0 C
+0.94 C
1938
5.3 C
+1.16 C
1939
4.2 C
+0.12 C
1940
3.4 C
-0.67 C
1941
4.6 C
+0.53 C
1943
4.3 C
+0.23 C
1944
4.5 C
+0.41 C
1945
4.9 C
+0.81 C
1946
5.7 C
+1.59 C
1962
2.7 C
-1.40 C
1963
3.1 C
-1.01 C
1964
2.9 C
-1.16 C
1965
2.4 C
-1.73 C
1966
3.0 C
-1.10 C
1967
3.1 C
-0.96 C
1968
2.8 C
-1.28 C
1969
2.9 C
-1.17 C
1970
2.8 C
-1.31 C
1971
3.1 C
-1.00 C
1972
2.4 C
-1.70 C
1973
4.4 C
+0.30 C
1974
2.7 C
-1.41 C
1975
3.2 C
-0.91 C
1976
2.7 C
-1.39 C
1978
2.7 C
-1.35 C
1979
4.5 C
+0.40 C
1980
3.2 C
-0.92 C
1985
3.3 C
-0.84 C
1986
3.8 C
-0.32 C
1987
5.0 C
+0.86 C
1988
4.1 C
-0.01 C
1989
3.2 C
-0.93 C
1990
5.1 C
+1.01 C
1991
4.6 C
+0.53 C
1992
3.4 C
-0.66 C
1993
3.8 C
-0.31 C
1994
3.9 C
-0.23 C
1995
4.3 C
+0.25 C
1996
4.1 C
0.00 C
1997
3.7 C
-0.44 C
1998
5.9 C
+1.79 C
1999
5.5 C
+1.45 C
2000
4.0 C
-0.05 C
2001
5.1 C
+0.99 C
2002
4.8 C
+0.70 C
2003
3.9 C
-0.19 C
2004
3.9 C
-0.20 C
2005
4.7 C
+0.61 C
2006
5.8 C
+1.75 C
2007
3.9 C
-0.21 C
2008
4.4 C
+0.35 C
2009
4.1 C
+0.03 C
2010
5.9 C
+1.81 C
2011
5.3 C
+1.17 C
2012
6.0 C
+1.91 C
The fitted trend in annual mean temperature here over 1932 to 2012 is 0.04 C (-0.07 to 0.16) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 58 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Middle Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.07 to 0.16) per decade
0.1 F (-0.1 to 0.3) per decade
1932 to 2012
58
Not clearly different from zero
Mean daily maximum
0.2 C (0.1 to 0.3) per decade
0.3 F (0.2 to 0.5) per decade
1932 to 2012
58
Rise
Mean daily minimum
-0.1 C (-0.3 to 0.1) per decade
-0.2 F (-0.5 to 0.2) per decade
1932 to 2012
58
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
1926 to 2013
Yearly extremes at Middle Dam: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
35.6 C (96.1 F)
1975
31.7 C (89.1 F)
76
Coldest night (TNn)
-36.7 C (-34.1 F)
1976
-30.0 C (-22.0 F)
76
Wettest day (Rx1day)
116.3 mm (4.6 in)
1927
46.9 mm (1.8 in)
88
Wettest five days (Rx5day)
149.3 mm (5.9 in)
1936
74.1 mm (2.9 in)
88
Longest dry spell (CDD)
26 days
2010
14 days
88
Hottest day (TXx)
The hottest day of the year at Middle Dam, 1926 to 2013. The record is 35.6 C (96.1 F) in 1975, marked on the chart; the median year is 31.7 C (89.1 F).
Hottest day (TXx) at Middle Dam by year
Year
Hottest day (TXx)
1926
33.3 C (91.9 F)
1927
29.4 C (84.9 F)
1928
32.2 C (90.0 F)
1929
n/a
1930
30.0 C (86.0 F)
1931
33.3 C (91.9 F)
1932
33.3 C (91.9 F)
1933
33.3 C (91.9 F)
1934
31.1 C (88.0 F)
1935
32.2 C (90.0 F)
1936
30.0 C (86.0 F)
1937
32.2 C (90.0 F)
1938
34.4 C (93.9 F)
1939
31.1 C (88.0 F)
1940
31.1 C (88.0 F)
1941
31.1 C (88.0 F)
1942
31.1 C (88.0 F)
1943
32.2 C (90.0 F)
1944
35.0 C (95.0 F)
1945
31.1 C (88.0 F)
1946
34.4 C (93.9 F)
1947
31.1 C (88.0 F)
1948
23.3 C (73.9 F)
1949
n/a
1950
25.6 C (78.1 F)
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
30.6 C (87.1 F)
1962
31.7 C (89.1 F)
1963
31.7 C (89.1 F)
1964
31.1 C (88.0 F)
1965
30.6 C (87.1 F)
1966
31.1 C (88.0 F)
1967
29.4 C (84.9 F)
1968
31.7 C (89.1 F)
1969
32.2 C (90.0 F)
1970
31.7 C (89.1 F)
1971
32.2 C (90.0 F)
1972
29.4 C (84.9 F)
1973
32.8 C (91.0 F)
1974
31.1 C (88.0 F)
1975
35.6 C (96.1 F)
1976
31.7 C (89.1 F)
1977
32.8 C (91.0 F)
1978
31.7 C (89.1 F)
1979
31.7 C (89.1 F)
1980
30.0 C (86.0 F)
1981
32.2 C (90.0 F)
1982
31.7 C (89.1 F)
1983
33.3 C (91.9 F)
1984
31.7 C (89.1 F)
1985
29.4 C (84.9 F)
1986
30.0 C (86.0 F)
1987
28.9 C (84.0 F)
1988
32.8 C (91.0 F)
1989
31.1 C (88.0 F)
1990
29.4 C (84.9 F)
1991
32.8 C (91.0 F)
1992
30.6 C (87.1 F)
1993
32.8 C (91.0 F)
1994
33.3 C (91.9 F)
1995
34.4 C (93.9 F)
1996
30.6 C (87.1 F)
1997
30.0 C (86.0 F)
1998
31.1 C (88.0 F)
1999
31.7 C (89.1 F)
2000
29.4 C (84.9 F)
2001
33.3 C (91.9 F)
2002
33.9 C (93.0 F)
2003
33.3 C (91.9 F)
2004
29.4 C (84.9 F)
2005
32.2 C (90.0 F)
2006
32.2 C (90.0 F)
2007
31.7 C (89.1 F)
2008
32.8 C (91.0 F)
2009
31.1 C (88.0 F)
2010
33.3 C (91.9 F)
2011
31.7 C (89.1 F)
2012
31.1 C (88.0 F)
2013
31.7 C (89.1 F)
Coldest night (TNn)
The coldest night of the year at Middle Dam, 1926 to 2013. The record is -36.7 C (-34.1 F) in 1976, marked on the chart; the median year is -30.0 C (-22.0 F).
Coldest night (TNn) at Middle Dam by year
Year
Coldest night (TNn)
1926
-12.8 C (9.0 F)
1927
-17.8 C (0.0 F)
1928
-0.6 C (30.9 F)
1929
n/a
1930
-18.9 C (-2.0 F)
1931
-21.1 C (-6.0 F)
1932
-20.6 C (-5.1 F)
1933
-23.9 C (-11.0 F)
1934
-26.7 C (-16.1 F)
1935
-25.6 C (-14.1 F)
1936
-21.1 C (-6.0 F)
1937
-17.8 C (0.0 F)
1938
-23.3 C (-9.9 F)
1939
-25.6 C (-14.1 F)
1940
-24.4 C (-11.9 F)
1941
-17.8 C (0.0 F)
1942
-26.7 C (-16.1 F)
1943
-17.8 C (0.0 F)
1944
-17.8 C (0.0 F)
1945
-25.6 C (-14.1 F)
1946
-25.6 C (-14.1 F)
1947
-24.4 C (-11.9 F)
1948
-17.8 C (0.0 F)
1949
n/a
1950
14.4 C (57.9 F)
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
-23.3 C (-9.9 F)
1962
-36.1 C (-33.0 F)
1963
-31.7 C (-25.1 F)
1964
-30.0 C (-22.0 F)
1965
-34.4 C (-29.9 F)
1966
-34.4 C (-29.9 F)
1967
-31.1 C (-24.0 F)
1968
-33.9 C (-29.0 F)
1969
-30.6 C (-23.1 F)
1970
-32.8 C (-27.0 F)
1971
-34.4 C (-29.9 F)
1972
-33.9 C (-29.0 F)
1973
-34.4 C (-29.9 F)
1974
-35.0 C (-31.0 F)
1975
-32.2 C (-26.0 F)
1976
-36.7 C (-34.1 F)
1977
-28.9 C (-20.0 F)
1978
-32.2 C (-26.0 F)
1979
-33.9 C (-29.0 F)
1980
-33.3 C (-27.9 F)
1981
-34.4 C (-29.9 F)
1982
-30.6 C (-23.1 F)
1983
-27.8 C (-18.0 F)
1984
-33.3 C (-27.9 F)
1985
-31.7 C (-25.1 F)
1986
-30.0 C (-22.0 F)
1987
-27.8 C (-18.0 F)
1988
-31.1 C (-24.0 F)
1989
-32.2 C (-26.0 F)
1990
-26.7 C (-16.1 F)
1991
-30.6 C (-23.1 F)
1992
-28.9 C (-20.0 F)
1993
-35.0 C (-31.0 F)
1994
-36.1 C (-33.0 F)
1995
-32.2 C (-26.0 F)
1996
-31.7 C (-25.1 F)
1997
-32.8 C (-27.0 F)
1998
-30.0 C (-22.0 F)
1999
-33.9 C (-29.0 F)
2000
-30.0 C (-22.0 F)
2001
-28.3 C (-18.9 F)
2002
-24.4 C (-11.9 F)
2003
-31.7 C (-25.1 F)
2004
-33.9 C (-29.0 F)
2005
-30.0 C (-22.0 F)
2006
-23.3 C (-9.9 F)
2007
-28.3 C (-18.9 F)
2008
-33.9 C (-29.0 F)
2009
-34.4 C (-29.9 F)
2010
-25.0 C (-13.0 F)
2011
-32.2 C (-26.0 F)
2012
-27.2 C (-17.0 F)
2013
-27.8 C (-18.0 F)
Wettest day (Rx1day)
The wettest day of the year at Middle Dam, 1926 to 2013. The record is 116.3 mm (4.6 in) in 1927, marked on the chart; the median year is 46.9 mm (1.8 in).
Wettest day (Rx1day) at Middle Dam by year
Year
Wettest day (Rx1day)
1926
54.9 mm (2.2 in)
1927
116.3 mm (4.6 in)
1928
50.8 mm (2.0 in)
1929
37.6 mm (1.5 in)
1930
37.1 mm (1.5 in)
1931
59.9 mm (2.4 in)
1932
64.5 mm (2.5 in)
1933
41.7 mm (1.6 in)
1934
59.7 mm (2.4 in)
1935
30.5 mm (1.2 in)
1936
58.4 mm (2.3 in)
1937
56.4 mm (2.2 in)
1938
76.2 mm (3.0 in)
1939
20.8 mm (0.8 in)
1940
61.0 mm (2.4 in)
1941
45.2 mm (1.8 in)
1942
96.5 mm (3.8 in)
1943
79.5 mm (3.1 in)
1944
48.3 mm (1.9 in)
1945
49.8 mm (2.0 in)
1946
47.2 mm (1.9 in)
1947
53.1 mm (2.1 in)
1948
33.8 mm (1.3 in)
1949
28.7 mm (1.1 in)
1950
47.5 mm (1.9 in)
1951
55.4 mm (2.2 in)
1952
50.3 mm (2.0 in)
1953
38.4 mm (1.5 in)
1954
81.8 mm (3.2 in)
1955
40.9 mm (1.6 in)
1956
27.2 mm (1.1 in)
1957
54.9 mm (2.2 in)
1958
45.2 mm (1.8 in)
1959
69.6 mm (2.7 in)
1960
57.2 mm (2.3 in)
1961
50.0 mm (2.0 in)
1962
76.5 mm (3.0 in)
1963
54.9 mm (2.2 in)
1964
41.7 mm (1.6 in)
1965
38.1 mm (1.5 in)
1966
38.1 mm (1.5 in)
1967
27.7 mm (1.1 in)
1968
42.9 mm (1.7 in)
1969
57.4 mm (2.3 in)
1970
55.9 mm (2.2 in)
1971
34.8 mm (1.4 in)
1972
26.7 mm (1.1 in)
1973
50.0 mm (2.0 in)
1974
34.3 mm (1.4 in)
1975
37.3 mm (1.5 in)
1976
46.5 mm (1.8 in)
1977
77.0 mm (3.0 in)
1978
45.7 mm (1.8 in)
1979
30.5 mm (1.2 in)
1980
33.3 mm (1.3 in)
1981
54.9 mm (2.2 in)
1982
32.3 mm (1.3 in)
1983
47.2 mm (1.9 in)
1984
41.7 mm (1.6 in)
1985
51.8 mm (2.0 in)
1986
46.2 mm (1.8 in)
1987
37.6 mm (1.5 in)
1988
37.6 mm (1.5 in)
1989
43.7 mm (1.7 in)
1990
47.5 mm (1.9 in)
1991
96.8 mm (3.8 in)
1992
46.5 mm (1.8 in)
1993
41.7 mm (1.6 in)
1994
30.7 mm (1.2 in)
1995
81.3 mm (3.2 in)
1996
49.0 mm (1.9 in)
1997
39.6 mm (1.6 in)
1998
44.7 mm (1.8 in)
1999
80.5 mm (3.2 in)
2000
56.9 mm (2.2 in)
2001
32.5 mm (1.3 in)
2002
45.0 mm (1.8 in)
2003
55.1 mm (2.2 in)
2004
36.3 mm (1.4 in)
2005
57.7 mm (2.3 in)
2006
43.7 mm (1.7 in)
2007
41.9 mm (1.6 in)
2008
105.7 mm (4.2 in)
2009
42.7 mm (1.7 in)
2010
58.4 mm (2.3 in)
2011
80.8 mm (3.2 in)
2012
46.0 mm (1.8 in)
2013
32.0 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Middle Dam, 1926 to 2013. The record is 149.3 mm (5.9 in) in 1936, marked on the chart; the median year is 74.1 mm (2.9 in).
Wettest five days (Rx5day) at Middle Dam by year
Year
Wettest five days (Rx5day)
1926
63.3 mm (2.5 in)
1927
130.5 mm (5.1 in)
1928
67.1 mm (2.6 in)
1929
58.4 mm (2.3 in)
1930
93.7 mm (3.7 in)
1931
90.3 mm (3.6 in)
1932
135.7 mm (5.3 in)
1933
93.4 mm (3.7 in)
1934
59.7 mm (2.4 in)
1935
65.5 mm (2.6 in)
1936
149.3 mm (5.9 in)
1937
80.7 mm (3.2 in)
1938
126.7 mm (5.0 in)
1939
56.9 mm (2.2 in)
1940
80.8 mm (3.2 in)
1941
61.4 mm (2.4 in)
1942
145.2 mm (5.7 in)
1943
110.0 mm (4.3 in)
1944
65.3 mm (2.6 in)
1945
81.8 mm (3.2 in)
1946
70.3 mm (2.8 in)
1947
92.8 mm (3.7 in)
1948
63.0 mm (2.5 in)
1949
74.7 mm (2.9 in)
1950
68.3 mm (2.7 in)
1951
68.4 mm (2.7 in)
1952
66.6 mm (2.6 in)
1953
81.3 mm (3.2 in)
1954
137.7 mm (5.4 in)
1955
66.3 mm (2.6 in)
1956
59.7 mm (2.4 in)
1957
68.6 mm (2.7 in)
1958
55.1 mm (2.2 in)
1959
89.6 mm (3.5 in)
1960
107.0 mm (4.2 in)
1961
55.6 mm (2.2 in)
1962
83.1 mm (3.3 in)
1963
62.6 mm (2.5 in)
1964
76.0 mm (3.0 in)
1965
68.3 mm (2.7 in)
1966
50.0 mm (2.0 in)
1967
34.9 mm (1.4 in)
1968
61.2 mm (2.4 in)
1969
91.7 mm (3.6 in)
1970
67.6 mm (2.7 in)
1971
56.9 mm (2.2 in)
1972
44.2 mm (1.7 in)
1973
88.9 mm (3.5 in)
1974
68.4 mm (2.7 in)
1975
73.4 mm (2.9 in)
1976
58.2 mm (2.3 in)
1977
116.9 mm (4.6 in)
1978
74.7 mm (2.9 in)
1979
48.7 mm (1.9 in)
1980
60.5 mm (2.4 in)
1981
90.7 mm (3.6 in)
1982
43.6 mm (1.7 in)
1983
70.3 mm (2.8 in)
1984
100.7 mm (4.0 in)
1985
53.1 mm (2.1 in)
1986
66.6 mm (2.6 in)
1987
56.6 mm (2.2 in)
1988
65.6 mm (2.6 in)
1989
101.1 mm (4.0 in)
1990
100.1 mm (3.9 in)
1991
130.8 mm (5.1 in)
1992
95.3 mm (3.8 in)
1993
84.3 mm (3.3 in)
1994
39.8 mm (1.6 in)
1995
91.8 mm (3.6 in)
1996
87.6 mm (3.4 in)
1997
72.6 mm (2.9 in)
1998
88.6 mm (3.5 in)
1999
112.6 mm (4.4 in)
2000
124.5 mm (4.9 in)
2001
54.3 mm (2.1 in)
2002
60.5 mm (2.4 in)
2003
109.9 mm (4.3 in)
2004
66.1 mm (2.6 in)
2005
100.2 mm (3.9 in)
2006
72.6 mm (2.9 in)
2007
95.0 mm (3.7 in)
2008
112.8 mm (4.4 in)
2009
62.7 mm (2.5 in)
2010
87.6 mm (3.4 in)
2011
119.1 mm (4.7 in)
2012
83.6 mm (3.3 in)
2013
86.8 mm (3.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Middle Dam, 1926 to 2013. The record is 26 days in 2010, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Middle Dam by year
Year
Longest dry spell (CDD)
1926
8 days
1927
16 days
1928
10 days
1929
11 days
1930
14 days
1931
20 days
1932
19 days
1933
9 days
1934
11 days
1935
16 days
1936
12 days
1937
12 days
1938
14 days
1939
20 days
1940
11 days
1941
19 days
1942
13 days
1943
14 days
1944
11 days
1945
11 days
1946
17 days
1947
11 days
1948
16 days
1949
12 days
1950
11 days
1951
14 days
1952
19 days
1953
15 days
1954
11 days
1955
11 days
1956
15 days
1957
15 days
1958
11 days
1959
11 days
1960
15 days
1961
16 days
1962
13 days
1963
17 days
1964
14 days
1965
13 days
1966
11 days
1967
12 days
1968
17 days
1969
13 days
1970
21 days
1971
18 days
1972
9 days
1973
15 days
1974
11 days
1975
13 days
1976
19 days
1977
12 days
1978
20 days
1979
18 days
1980
19 days
1981
14 days
1982
14 days
1983
13 days
1984
17 days
1985
15 days
1986
14 days
1987
20 days
1988
15 days
1989
15 days
1990
12 days
1991
11 days
1992
13 days
1993
10 days
1994
14 days
1995
15 days
1996
14 days
1997
13 days
1998
18 days
1999
17 days
2000
9 days
2001
17 days
2002
18 days
2003
14 days
2004
14 days
2005
12 days
2006
17 days
2007
14 days
2008
13 days
2009
15 days
2010
26 days
2011
11 days
2012
14 days
2013
18 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
58 years with a frost
Across 58 years with a frost, the median last spring frost at Middle Dam falls on 24 May and the median first autumn frost on 24 September, which leaves a median of 123 days between them.
Fitted over all years, the growing season changes by +1.3 days per decade at this station.
Frost dates and growing season at Middle Dam
Measure
Median, all years
Earliest period
Recent period (1979 to 2012)
Recent against earliest
Fitted trend
Last spring frost
24 May
n/a
20 May
n/a
-0.1 days per decade
First autumn frost
24 September
n/a
25 September
n/a
+1.3 days per decade
Growing days
123 days
n/a
126 days
n/a
+1.3 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
82 years, 1927 to 2012
A day with at least 47.2 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 117.3 mm (4.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Middle Dam: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
47.2 mm (1.9 in)
5 years
63.1 mm (2.5 in)
10 years
74.7 mm (2.9 in)
25 years
90.6 mm (3.6 in)
50 years
103.5 mm (4.1 in)
100 years
117.3 mm (4.6 in)
Longer than the 82 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, 82 years of values from 1927 to 2012.
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: 116.3 mm (4.6 in) in 1927; 105.7 mm (4.2 in) in 2008; 96.8 mm (3.8 in) in 1991.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Middle Dam, at 1978. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1978 ran 0.6 C (1.0 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Middle Dam, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1978
+0.6
+1.0
likely
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 Middle Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Middle Dam 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.