Record envelope, standing records and threshold days for Rockland (USC00177250), Maine, United States, with 40 years of record.
Key Facts for Rockland
Rockland (USC00177250) is a weather station in Maine, United States at 44.10 latitude and -69.12 longitude, 12 m (39 ft) above sea level.
The station reports from 1937 to 1976, 40 years of record.
1,464 records set at Rockland still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Rockland set a daily record low minimum temperature of 3.9 C (39.0 F) on 9 September 1976.
About the Station
Location: Maine, United States, 44.10 latitude, -69.12 longitude.
Elevation: 12 m (39 ft).
Period of record: 1937 to 1976, 40 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 Rockland. 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 Rockland, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.8 C (55.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-34.4 C (-29.9 F)
n/a
n/a
Mar
25.0 C (77.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-12.2 C (10.0 F)
n/a
n/a
May
33.3 C (91.9 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
36.7 C (98.1 F)
-2.2 C (28.0 F)
n/a
n/a
Jul
35.6 C (96.1 F)
4.4 C (39.9 F)
n/a
n/a
Aug
37.2 C (99.0 F)
3.3 C (37.9 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-4.4 C (24.1 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
22.2 C (72.0 F)
-16.7 C (1.9 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-26.7 C (-16.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Rockland still stand. 1953 holds the most, with 64.
Standing records at Rockland by the year they were set
Year set
Standing records
1937
8
1938
40
1939
41
1940
37
1941
35
1942
47
1943
48
1944
39
1945
49
1946
49
1947
41
1948
47
1949
46
1950
44
1951
44
1952
28
1953
64
1954
37
1955
40
1956
48
1957
40
1958
38
1959
33
1960
21
1961
34
1962
34
1963
32
1964
35
1965
33
1966
28
1967
34
1968
37
1969
24
1970
26
1971
33
1972
27
1973
35
1974
38
1975
22
1976
28
All-Time Record Progression
3 new records
3 all-time records were set at Rockland between 27 December 1970 and 8 February 1971. Each dot is a new record.
When Rockland set new all-time records
Date
Kind
Detail
1970-12-27
Record snow depth
Record snow depth 94.0 cm (37.0 in)
1971-01-23
Record snow depth
Record snow depth 101.6 cm (40.0 in)
1971-02-08
Record snow depth
Record snow depth 104.1 cm (41.0 in)
Wettest Day of Each Month
Sep: 157.7 mm (6.2 in)
The wettest day on record for each calendar month at Rockland. The most was 157.7 mm (6.2 in) on 11 September 1954.
Record daily precipitation for each month at Rockland
Month
Record daily precipitation (mm)
Date
Jan
53.8 mm (2.1 in)
20 January 1942
Feb
59.7 mm (2.4 in)
17 February 1955
Mar
81.5 mm (3.2 in)
16 March 1953
Apr
66.5 mm (2.6 in)
13 April 1940
May
67.1 mm (2.6 in)
27 May 1961
Jun
106.2 mm (4.2 in)
21 June 1967
Jul
117.3 mm (4.6 in)
19 July 1951
Aug
73.9 mm (2.9 in)
4 August 1943
Sep
157.7 mm (6.2 in)
11 September 1954
Oct
72.6 mm (2.9 in)
25 October 1959
Nov
107.7 mm (4.2 in)
21 November 1961
Dec
80.5 mm (3.2 in)
12 December 1967
Period of Record Coverage
1937 to 1976
Complete yearUnder 90 percent of days
40 years of record at Rockland, 1937 to 1976. 2 years have data for under 90 percent of days and are left out of rankings: 1937, 1976.
Cooler than the station meanWarmer than the station mean
One stripe for each of 38 complete years at Rockland, 1938 to 1975. Blue stripes are years cooler than the station's own mean of 7.3 C (45.1 F); red stripes are warmer. The coolest year was 1940, at 6.0 C (42.8 F), and the warmest was 1953, at 9.1 C (48.3 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Rockland as warming stripes, 1938 to 1975
Year
Annual mean temperature
Difference from the station mean
1938
7.8 C
+0.49 C
1939
6.4 C
-0.92 C
1940
6.0 C
-1.29 C
1941
7.1 C
-0.16 C
1942
7.1 C
-0.21 C
1943
6.1 C
-1.18 C
1944
7.1 C
-0.25 C
1945
6.6 C
-0.67 C
1946
7.7 C
+0.41 C
1947
7.6 C
+0.31 C
1948
7.1 C
-0.18 C
1949
8.2 C
+0.91 C
1950
7.5 C
+0.24 C
1951
8.3 C
+1.00 C
1952
8.6 C
+1.27 C
1953
9.1 C
+1.76 C
1954
7.7 C
+0.36 C
1955
7.6 C
+0.27 C
1956
6.9 C
-0.36 C
1957
8.0 C
+0.65 C
1958
7.0 C
-0.27 C
1959
7.2 C
-0.06 C
1960
7.3 C
+0.02 C
1961
7.3 C
-0.03 C
1962
6.7 C
-0.60 C
1963
7.1 C
-0.21 C
1964
7.2 C
-0.11 C
1965
7.0 C
-0.30 C
1966
7.5 C
+0.18 C
1967
6.8 C
-0.54 C
1968
6.9 C
-0.41 C
1969
7.7 C
+0.36 C
1970
7.0 C
-0.26 C
1971
7.1 C
-0.21 C
1972
6.5 C
-0.81 C
1973
8.0 C
+0.73 C
1974
7.0 C
-0.34 C
1975
7.6 C
+0.29 C
The fitted trend in annual mean temperature here over 1938 to 1975 is 0.02 C (-0.18 to 0.21) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.03 F (-0.32 to 0.38) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Rockland
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.02 C (-0.18 to 0.21) per decade
0.03 F (-0.32 to 0.38) per decade
1938 to 1975
38
Not clearly different from zero
Mean daily maximum
-0.17 C (-0.37 to 0.03) per decade
-0.3 F (-0.7 to 0.1) per decade
1938 to 1975
38
Not clearly different from zero
Mean daily minimum
0.21 C (-0.02 to 0.43) per decade
0.37 F (-0.04 to 0.78) per decade
1938 to 1975
38
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
1937 to 1976
Yearly extremes at Rockland: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.2 C (99.0 F)
1944
33.3 C (91.9 F)
40
Coldest night (TNn)
-34.4 C (-29.9 F)
1943
-23.9 C (-11.0 F)
40
Wettest day (Rx1day)
157.7 mm (6.2 in)
1954
64.2 mm (2.5 in)
40
Wettest five days (Rx5day)
188.7 mm (7.4 in)
1954
103.0 mm (4.1 in)
40
Longest dry spell (CDD)
35 days
1948
15 days
40
Hottest day (TXx)
The hottest day of the year at Rockland, 1937 to 1976. The record is 37.2 C (99.0 F) in 1944, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Rockland by year
Year
Hottest day (TXx)
1937
16.7 C (62.1 F)
1938
32.2 C (90.0 F)
1939
33.3 C (91.9 F)
1940
31.7 C (89.1 F)
1941
36.7 C (98.1 F)
1942
32.2 C (90.0 F)
1943
33.9 C (93.0 F)
1944
37.2 C (99.0 F)
1945
35.0 C (95.0 F)
1946
35.6 C (96.1 F)
1947
36.1 C (97.0 F)
1948
37.2 C (99.0 F)
1949
36.7 C (98.1 F)
1950
32.2 C (90.0 F)
1951
31.7 C (89.1 F)
1952
33.9 C (93.0 F)
1953
35.0 C (95.0 F)
1954
31.7 C (89.1 F)
1955
35.0 C (95.0 F)
1956
32.2 C (90.0 F)
1957
33.3 C (91.9 F)
1958
31.7 C (89.1 F)
1959
33.9 C (93.0 F)
1960
33.3 C (91.9 F)
1961
32.8 C (91.0 F)
1962
31.1 C (88.0 F)
1963
35.6 C (96.1 F)
1964
32.2 C (90.0 F)
1965
34.4 C (93.9 F)
1966
33.3 C (91.9 F)
1967
31.7 C (89.1 F)
1968
33.9 C (93.0 F)
1969
33.9 C (93.0 F)
1970
33.3 C (91.9 F)
1971
32.8 C (91.0 F)
1972
30.0 C (86.0 F)
1973
33.3 C (91.9 F)
1974
30.6 C (87.1 F)
1975
36.1 C (97.0 F)
1976
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Rockland, 1937 to 1976. The record is -34.4 C (-29.9 F) in 1943, marked on the chart; the median year is -23.9 C (-11.0 F).
Coldest night (TNn) at Rockland by year
Year
Coldest night (TNn)
1937
-19.4 C (-2.9 F)
1938
-19.4 C (-2.9 F)
1939
-21.7 C (-7.1 F)
1940
-21.7 C (-7.1 F)
1941
-22.2 C (-8.0 F)
1942
-26.7 C (-16.1 F)
1943
-34.4 C (-29.9 F)
1944
-22.8 C (-9.0 F)
1945
-26.1 C (-15.0 F)
1946
-25.6 C (-14.1 F)
1947
-26.7 C (-16.1 F)
1948
-26.7 C (-16.1 F)
1949
-20.6 C (-5.1 F)
1950
-24.4 C (-11.9 F)
1951
-24.4 C (-11.9 F)
1952
-20.6 C (-5.1 F)
1953
-17.2 C (1.0 F)
1954
-23.9 C (-11.0 F)
1955
-23.3 C (-9.9 F)
1956
-21.7 C (-7.1 F)
1957
-26.7 C (-16.1 F)
1958
-20.6 C (-5.1 F)
1959
-23.3 C (-9.9 F)
1960
-23.9 C (-11.0 F)
1961
-26.7 C (-16.1 F)
1962
-22.8 C (-9.0 F)
1963
-23.9 C (-11.0 F)
1964
-20.0 C (-4.0 F)
1965
-25.6 C (-14.1 F)
1966
-24.4 C (-11.9 F)
1967
-27.2 C (-17.0 F)
1968
-26.1 C (-15.0 F)
1969
-23.3 C (-9.9 F)
1970
-21.7 C (-7.1 F)
1971
-27.8 C (-18.0 F)
1972
-25.6 C (-14.1 F)
1973
-24.4 C (-11.9 F)
1974
-25.0 C (-13.0 F)
1975
-23.3 C (-9.9 F)
1976
-25.0 C (-13.0 F)
Wettest day (Rx1day)
The wettest day of the year at Rockland, 1937 to 1976. The record is 157.7 mm (6.2 in) in 1954, marked on the chart; the median year is 64.2 mm (2.5 in).
Wettest day (Rx1day) at Rockland by year
Year
Wettest day (Rx1day)
1937
78.7 mm (3.1 in)
1938
45.7 mm (1.8 in)
1939
69.9 mm (2.8 in)
1940
66.5 mm (2.6 in)
1941
95.3 mm (3.8 in)
1942
69.3 mm (2.7 in)
1943
73.9 mm (2.9 in)
1944
96.5 mm (3.8 in)
1945
50.8 mm (2.0 in)
1946
72.1 mm (2.8 in)
1947
49.0 mm (1.9 in)
1948
42.9 mm (1.7 in)
1949
49.5 mm (1.9 in)
1950
49.5 mm (1.9 in)
1951
117.3 mm (4.6 in)
1952
42.9 mm (1.7 in)
1953
81.5 mm (3.2 in)
1954
157.7 mm (6.2 in)
1955
64.5 mm (2.5 in)
1956
41.7 mm (1.6 in)
1957
49.0 mm (1.9 in)
1958
60.2 mm (2.4 in)
1959
84.6 mm (3.3 in)
1960
57.4 mm (2.3 in)
1961
107.7 mm (4.2 in)
1962
63.8 mm (2.5 in)
1963
55.6 mm (2.2 in)
1964
57.2 mm (2.3 in)
1965
39.6 mm (1.6 in)
1966
86.6 mm (3.4 in)
1967
106.2 mm (4.2 in)
1968
41.4 mm (1.6 in)
1969
101.9 mm (4.0 in)
1970
55.1 mm (2.2 in)
1971
61.0 mm (2.4 in)
1972
85.3 mm (3.4 in)
1973
74.9 mm (2.9 in)
1974
74.7 mm (2.9 in)
1975
60.2 mm (2.4 in)
1976
38.4 mm (1.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Rockland, 1937 to 1976. The record is 188.7 mm (7.4 in) in 1954, marked on the chart; the median year is 103.0 mm (4.1 in).
Wettest five days (Rx5day) at Rockland by year
Year
Wettest five days (Rx5day)
1937
119.9 mm (4.7 in)
1938
75.7 mm (3.0 in)
1939
85.7 mm (3.4 in)
1940
123.4 mm (4.9 in)
1941
108.6 mm (4.3 in)
1942
124.5 mm (4.9 in)
1943
130.1 mm (5.1 in)
1944
119.3 mm (4.7 in)
1945
81.5 mm (3.2 in)
1946
92.2 mm (3.6 in)
1947
88.6 mm (3.5 in)
1948
98.8 mm (3.9 in)
1949
78.7 mm (3.1 in)
1950
102.9 mm (4.1 in)
1951
138.1 mm (5.4 in)
1952
68.5 mm (2.7 in)
1953
160.0 mm (6.3 in)
1954
188.7 mm (7.4 in)
1955
136.9 mm (5.4 in)
1956
91.6 mm (3.6 in)
1957
75.8 mm (3.0 in)
1958
104.8 mm (4.1 in)
1959
130.1 mm (5.1 in)
1960
84.6 mm (3.3 in)
1961
146.5 mm (5.8 in)
1962
103.1 mm (4.1 in)
1963
133.2 mm (5.2 in)
1964
64.5 mm (2.5 in)
1965
69.6 mm (2.7 in)
1966
102.3 mm (4.0 in)
1967
139.9 mm (5.5 in)
1968
86.3 mm (3.4 in)
1969
109.1 mm (4.3 in)
1970
80.6 mm (3.2 in)
1971
74.0 mm (2.9 in)
1972
106.2 mm (4.2 in)
1973
122.4 mm (4.8 in)
1974
81.3 mm (3.2 in)
1975
132.9 mm (5.2 in)
1976
70.1 mm (2.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Rockland, 1937 to 1976. The record is 35 days in 1948, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Rockland by year
Year
Longest dry spell (CDD)
1937
8 days
1938
18 days
1939
15 days
1940
22 days
1941
24 days
1942
11 days
1943
12 days
1944
15 days
1945
15 days
1946
15 days
1947
19 days
1948
35 days
1949
14 days
1950
28 days
1951
15 days
1952
14 days
1953
22 days
1954
13 days
1955
18 days
1956
15 days
1957
13 days
1958
12 days
1959
13 days
1960
11 days
1961
24 days
1962
12 days
1963
23 days
1964
14 days
1965
20 days
1966
12 days
1967
11 days
1968
23 days
1969
14 days
1970
19 days
1971
18 days
1972
10 days
1973
15 days
1974
10 days
1975
26 days
1976
12 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
38 years with a frost
Across 38 years with a frost, the median last spring frost at Rockland falls on 9 May and the median first autumn frost on 29 September, which leaves a median of 142 days between them.
Fitted over all years, the growing season changes by +2.9 days per decade at this station.
Frost dates and growing season at Rockland
Measure
Median, all years
Earliest period
Recent period (1946 to 1975)
Recent against earliest
Fitted trend
Last spring frost
9 May
n/a
8 May
n/a
-1.7 days per decade
First autumn frost
29 September
n/a
29 September
n/a
+1.1 days per decade
Growing days
142 days
n/a
142 days
n/a
+2.9 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
38 years, 1938 to 1975
A day with at least 64.2 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 163.9 mm (6.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Rockland: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
64.2 mm (2.5 in)
5 years
86.3 mm (3.4 in)
10 years
102.6 mm (4.0 in)
25 years
125.4 mm (4.9 in)
50 years
143.9 mm (5.7 in)
Longer than the 38 years of record
100 years
163.9 mm (6.5 in)
Longer than the 38 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, 38 years of values from 1938 to 1975.
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: 157.7 mm (6.2 in) in 1954; 117.3 mm (4.6 in) in 1951; 107.7 mm (4.2 in) in 1961.
Download the Data
Data for Rockland standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rockland 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.