Record envelope, standing records and threshold days for Grand Lake Stream (USC00173261), Maine, United States, with 79 years of record.
Key Facts for Grand Lake Stream
Grand Lake Stream (USC00173261) is a weather station in Maine, United States at 45.18 latitude and -67.78 longitude, 90 m (295 ft) above sea level.
The station reports from 1948 to 2026, 79 years of record.
1,464 records set at Grand Lake Stream still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Grand Lake Stream tied a daily record high minimum temperature of 18.3 C (64.9 F) on 9 August 2026.
About the Station
Location: Maine, United States, 45.18 latitude, -67.78 longitude.
Elevation: 90 m (295 ft).
Period of record: 1948 to 2026, 79 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
3 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 Grand Lake Stream. The lines show the 2026 daily maximum and minimum. 3 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Grand Lake Stream, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.1 C (61.0 F)
-33.3 C (-27.9 F)
8.9 C (48.0 F)
-23.9 C (-11.0 F)
Feb
20.0 C (68.0 F)
-35.6 C (-32.1 F)
6.1 C (43.0 F)
-22.2 C (-8.0 F)
Mar
29.4 C (84.9 F)
-30.0 C (-22.0 F)
21.7 C (71.1 F)
-21.1 C (-6.0 F)
Apr
27.8 C (82.0 F)
-16.1 C (3.0 F)
20.6 C (69.1 F)
-7.2 C (19.0 F)
May
35.0 C (95.0 F)
-6.7 C (19.9 F)
30.0 C (86.0 F)
-1.7 C (28.9 F)
Jun
38.3 C (100.9 F)
-3.9 C (25.0 F)
30.6 C (87.1 F)
1.7 C (35.1 F)
Jul
36.1 C (97.0 F)
1.7 C (35.1 F)
33.9 C (93.0 F)
9.4 C (48.9 F)
Aug
38.3 C (100.9 F)
0.6 C (33.1 F)
32.8 C (91.0 F)
9.4 C (48.9 F)
Sep
34.4 C (93.9 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
29.4 C (84.9 F)
-10.0 C (14.0 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-21.1 C (-6.0 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-32.8 C (-27.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Grand Lake Stream still stand. 2002 holds the most, with 98.
Standing records at Grand Lake Stream by the year they were set
Year set
Standing records
1961
1
1962
24
1963
27
1964
17
1965
11
1966
23
1967
24
1968
14
1969
24
1970
21
1971
18
1972
19
1973
23
1974
27
1975
27
1976
35
1977
32
1978
20
1979
37
1980
20
1981
16
1982
28
1983
19
1984
26
1985
12
1986
21
1987
18
1988
21
1989
33
1990
23
1991
22
1992
20
1993
31
1994
21
1995
22
1996
20
1997
11
1998
17
1999
27
2000
31
2001
49
2002
98
2003
26
2004
9
2005
12
2006
18
2007
19
2008
11
2009
14
2010
41
2011
12
2012
25
2013
18
2014
17
2015
17
2016
20
2017
22
2018
10
2019
8
2020
14
2021
26
2022
25
2023
30
2024
20
2025
12
2026
8
All-Time Record Progression
5 new records
5 all-time records were set at Grand Lake Stream between 17 September 1999 and 13 February 2017. Each dot is a new record.
When Grand Lake Stream set new all-time records
Date
Kind
Detail
1999-09-17
Record daily precipitation
Record daily precipitation 86.4 mm (3.4 in)
2004-01-15
Record low maximum temperature
Record low maximum temperature -21.7 C (-7.1 F)
2005-03-09
Record daily precipitation
Record daily precipitation 92.2 mm (3.6 in)
2015-10-01
Record daily precipitation
Record daily precipitation 119.1 mm (4.7 in)
2017-02-13
Record daily snowfall
Record daily snowfall 55.1 cm (21.7 in)
Wettest Day of Each Month
Oct: 119.1 mm (4.7 in)
The wettest day on record for each calendar month at Grand Lake Stream. The most was 119.1 mm (4.7 in) on 1 October 2015.
Record daily precipitation for each month at Grand Lake Stream
Month
Record daily precipitation (mm)
Date
Jan
74.2 mm (2.9 in)
13 January 2018
Feb
77.5 mm (3.1 in)
4 February 1970
Mar
92.2 mm (3.6 in)
9 March 2005
Apr
79.0 mm (3.1 in)
29 April 1973
May
49.8 mm (2.0 in)
27 May 2005
Jun
75.7 mm (3.0 in)
23 June 1992
Jul
76.2 mm (3.0 in)
14 July 1996
Aug
78.7 mm (3.1 in)
10 August 2024
Sep
86.4 mm (3.4 in)
17 September 1999
Oct
119.1 mm (4.7 in)
1 October 2015
Nov
74.9 mm (2.9 in)
4 November 2007
Dec
83.1 mm (3.3 in)
2 December 2005
Period of Record Coverage
1961 to 2026
Complete yearUnder 90 percent of days
66 years of record at Grand Lake Stream, 1961 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1961, 1965, 1968, 2008, 2018, 2026.
Cooler than the station meanWarmer than the station mean
One stripe for each of 53 complete years at Grand Lake Stream, 1962 to 2025. Blue stripes are years cooler than the station's own mean of 5.8 C (42.5 F); red stripes are warmer. The coolest year was 2002, at 3.3 C (38.0 F), and the warmest was 2010, at 8.5 C (47.3 F). The strongest colour marks a difference of 2.7 C (4.9 F).
Annual mean temperature at Grand Lake Stream as warming stripes, 1962 to 2025
Year
Annual mean temperature
Difference from the station mean
1962
5.0 C
-0.86 C
1963
5.4 C
-0.47 C
1964
5.5 C
-0.38 C
1966
6.2 C
+0.36 C
1967
4.9 C
-0.94 C
1969
6.1 C
+0.23 C
1970
5.5 C
-0.29 C
1971
5.5 C
-0.31 C
1972
4.6 C
-1.21 C
1975
5.3 C
-0.57 C
1976
4.9 C
-0.95 C
1977
5.3 C
-0.52 C
1978
4.8 C
-0.99 C
1979
6.4 C
+0.54 C
1980
4.9 C
-0.94 C
1981
6.1 C
+0.22 C
1982
5.5 C
-0.36 C
1984
6.1 C
+0.23 C
1985
5.1 C
-0.71 C
1986
5.1 C
-0.73 C
1987
5.6 C
-0.21 C
1988
5.8 C
-0.06 C
1989
4.7 C
-1.16 C
1990
6.5 C
+0.70 C
1991
6.1 C
+0.29 C
1992
5.3 C
-0.58 C
1993
5.2 C
-0.62 C
1994
5.6 C
-0.21 C
1996
5.4 C
-0.44 C
1997
4.8 C
-1.07 C
1998
6.4 C
+0.59 C
1999
6.4 C
+0.61 C
2000
4.2 C
-1.65 C
2001
4.5 C
-1.38 C
2002
3.3 C
-2.50 C
2003
5.0 C
-0.87 C
2004
4.9 C
-0.91 C
2005
6.2 C
+0.34 C
2006
7.2 C
+1.34 C
2007
5.6 C
-0.23 C
2009
6.1 C
+0.23 C
2010
8.5 C
+2.66 C
2011
7.4 C
+1.58 C
2012
8.1 C
+2.26 C
2013
6.8 C
+0.95 C
2014
6.8 C
+0.94 C
2015
6.5 C
+0.68 C
2016
7.7 C
+1.90 C
2017
6.9 C
+1.06 C
2019
6.1 C
+0.30 C
2020
7.5 C
+1.66 C
2023
8.0 C
+2.12 C
2025
6.4 C
+0.59 C
The annual mean temperature here has risen by 0.3 C (0.2 to 0.5) per decade over 1962 to 2025. In Fahrenheit: 0.6 F (0.3 to 0.8) 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 Grand Lake Stream
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.2 to 0.5) per decade
0.6 F (0.3 to 0.8) per decade
1962 to 2025
53
Rise
Mean daily maximum
0.3 C (0.2 to 0.4) per decade
0.5 F (0.3 to 0.7) per decade
1962 to 2025
53
Rise
Mean daily minimum
0.3 C (0.1 to 0.6) per decade
0.6 F (0.2 to 1.1) per decade
1962 to 2025
53
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
1948 to 2026
Yearly extremes at Grand Lake Stream: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.3 C (100.9 F)
1975
33.3 C (91.9 F)
66
Coldest night (TNn)
-35.6 C (-32.1 F)
1962
-26.1 C (-15.0 F)
66
Wettest day (Rx1day)
119.1 mm (4.7 in)
2015
61.9 mm (2.4 in)
70
Wettest five days (Rx5day)
164.6 mm (6.5 in)
2023
86.2 mm (3.4 in)
70
Longest dry spell (CDD)
26 days
1965
17 days
70
Hottest day (TXx)
The hottest day of the year at Grand Lake Stream, 1948 to 2026. The record is 38.3 C (100.9 F) in 1975, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Grand Lake Stream by year
Year
Hottest day (TXx)
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1961
18.9 C (66.0 F)
1962
32.2 C (90.0 F)
1963
35.6 C (96.1 F)
1964
33.3 C (91.9 F)
1965
32.8 C (91.0 F)
1966
32.2 C (90.0 F)
1967
32.2 C (90.0 F)
1968
29.4 C (84.9 F)
1969
33.3 C (91.9 F)
1970
33.3 C (91.9 F)
1971
33.3 C (91.9 F)
1972
31.7 C (89.1 F)
1973
35.0 C (95.0 F)
1974
31.7 C (89.1 F)
1975
38.3 C (100.9 F)
1976
33.9 C (93.0 F)
1977
33.3 C (91.9 F)
1978
33.3 C (91.9 F)
1979
31.7 C (89.1 F)
1980
32.2 C (90.0 F)
1981
32.8 C (91.0 F)
1982
33.9 C (93.0 F)
1983
33.3 C (91.9 F)
1984
33.9 C (93.0 F)
1985
31.7 C (89.1 F)
1986
32.2 C (90.0 F)
1987
35.0 C (95.0 F)
1988
38.3 C (100.9 F)
1989
34.4 C (93.9 F)
1990
32.8 C (91.0 F)
1991
35.0 C (95.0 F)
1992
35.0 C (95.0 F)
1993
35.6 C (96.1 F)
1994
35.0 C (95.0 F)
1995
34.4 C (93.9 F)
1996
32.8 C (91.0 F)
1997
33.3 C (91.9 F)
1998
33.3 C (91.9 F)
1999
34.4 C (93.9 F)
2000
32.8 C (91.0 F)
2001
34.4 C (93.9 F)
2002
35.6 C (96.1 F)
2003
33.9 C (93.0 F)
2004
31.1 C (88.0 F)
2005
33.9 C (93.0 F)
2006
32.8 C (91.0 F)
2007
33.9 C (93.0 F)
2008
32.2 C (90.0 F)
2009
32.8 C (91.0 F)
2010
34.4 C (93.9 F)
2011
33.3 C (91.9 F)
2012
32.2 C (90.0 F)
2013
33.3 C (91.9 F)
2014
33.3 C (91.9 F)
2015
32.8 C (91.0 F)
2016
31.7 C (89.1 F)
2017
33.3 C (91.9 F)
2018
34.4 C (93.9 F)
2019
33.3 C (91.9 F)
2020
35.6 C (96.1 F)
2021
33.9 C (93.0 F)
2022
33.3 C (91.9 F)
2023
33.9 C (93.0 F)
2024
35.6 C (96.1 F)
2025
35.6 C (96.1 F)
2026
33.9 C (93.0 F)
Coldest night (TNn)
The coldest night of the year at Grand Lake Stream, 1948 to 2026. The record is -35.6 C (-32.1 F) in 1962, marked on the chart; the median year is -26.1 C (-15.0 F).
Coldest night (TNn) at Grand Lake Stream by year
Year
Coldest night (TNn)
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1961
-16.1 C (3.0 F)
1962
-35.6 C (-32.1 F)
1963
-26.7 C (-16.1 F)
1964
-24.4 C (-11.9 F)
1965
-30.0 C (-22.0 F)
1966
-30.0 C (-22.0 F)
1967
-28.9 C (-20.0 F)
1968
-25.6 C (-14.1 F)
1969
-26.1 C (-15.0 F)
1970
-26.1 C (-15.0 F)
1971
-32.8 C (-27.0 F)
1972
-29.4 C (-20.9 F)
1973
-28.3 C (-18.9 F)
1974
-26.1 C (-15.0 F)
1975
-28.9 C (-20.0 F)
1976
-30.6 C (-23.1 F)
1977
-26.1 C (-15.0 F)
1978
-22.8 C (-9.0 F)
1979
-29.4 C (-20.9 F)
1980
-29.4 C (-20.9 F)
1981
-31.7 C (-25.1 F)
1982
-33.3 C (-27.9 F)
1983
-22.8 C (-9.0 F)
1984
-31.1 C (-24.0 F)
1985
-26.1 C (-15.0 F)
1986
-26.1 C (-15.0 F)
1987
-26.7 C (-16.1 F)
1988
-29.4 C (-20.9 F)
1989
-32.8 C (-27.0 F)
1990
-27.8 C (-18.0 F)
1991
-27.8 C (-18.0 F)
1992
-26.1 C (-15.0 F)
1993
-28.9 C (-20.0 F)
1994
-29.4 C (-20.9 F)
1995
-31.1 C (-24.0 F)
1996
-26.1 C (-15.0 F)
1997
-26.1 C (-15.0 F)
1998
-26.7 C (-16.1 F)
1999
-32.2 C (-26.0 F)
2000
-29.4 C (-20.9 F)
2001
-30.0 C (-22.0 F)
2002
-28.3 C (-18.9 F)
2003
-32.2 C (-26.0 F)
2004
-29.4 C (-20.9 F)
2005
-26.1 C (-15.0 F)
2006
-20.6 C (-5.1 F)
2007
-24.4 C (-11.9 F)
2008
-26.7 C (-16.1 F)
2009
-25.6 C (-14.1 F)
2010
-16.7 C (1.9 F)
2011
-20.0 C (-4.0 F)
2012
-19.4 C (-2.9 F)
2013
-27.8 C (-18.0 F)
2014
-24.4 C (-11.9 F)
2015
-21.1 C (-6.0 F)
2016
-20.6 C (-5.1 F)
2017
-20.6 C (-5.1 F)
2018
-20.6 C (-5.1 F)
2019
-18.9 C (-2.0 F)
2020
-21.1 C (-6.0 F)
2021
-16.1 C (3.0 F)
2022
-20.0 C (-4.0 F)
2023
-24.4 C (-11.9 F)
2024
-20.6 C (-5.1 F)
2025
-24.4 C (-11.9 F)
2026
-23.9 C (-11.0 F)
Wettest day (Rx1day)
The wettest day of the year at Grand Lake Stream, 1948 to 2026. The record is 119.1 mm (4.7 in) in 2015, marked on the chart; the median year is 61.9 mm (2.4 in).
Wettest day (Rx1day) at Grand Lake Stream by year
Year
Wettest day (Rx1day)
1948
43.9 mm (1.7 in)
1949
33.3 mm (1.3 in)
1950
51.6 mm (2.0 in)
1951
51.1 mm (2.0 in)
1961
36.3 mm (1.4 in)
1962
47.0 mm (1.9 in)
1963
63.5 mm (2.5 in)
1964
34.5 mm (1.4 in)
1965
62.0 mm (2.4 in)
1966
63.5 mm (2.5 in)
1967
70.1 mm (2.8 in)
1968
40.1 mm (1.6 in)
1969
68.6 mm (2.7 in)
1970
77.5 mm (3.1 in)
1971
50.3 mm (2.0 in)
1972
70.4 mm (2.8 in)
1973
79.0 mm (3.1 in)
1974
64.8 mm (2.6 in)
1975
50.5 mm (2.0 in)
1976
53.8 mm (2.1 in)
1977
57.4 mm (2.3 in)
1978
61.7 mm (2.4 in)
1979
73.2 mm (2.9 in)
1980
39.4 mm (1.6 in)
1981
70.6 mm (2.8 in)
1982
54.9 mm (2.2 in)
1983
69.6 mm (2.7 in)
1984
62.5 mm (2.5 in)
1985
48.8 mm (1.9 in)
1986
36.8 mm (1.4 in)
1987
56.1 mm (2.2 in)
1988
50.0 mm (2.0 in)
1989
63.5 mm (2.5 in)
1990
48.8 mm (1.9 in)
1991
69.6 mm (2.7 in)
1992
75.7 mm (3.0 in)
1993
76.2 mm (3.0 in)
1994
54.1 mm (2.1 in)
1995
74.2 mm (2.9 in)
1996
76.2 mm (3.0 in)
1997
32.8 mm (1.3 in)
1998
65.8 mm (2.6 in)
1999
86.4 mm (3.4 in)
2000
51.3 mm (2.0 in)
2001
41.4 mm (1.6 in)
2002
75.4 mm (3.0 in)
2003
61.2 mm (2.4 in)
2004
57.2 mm (2.3 in)
2005
92.2 mm (3.6 in)
2006
67.8 mm (2.7 in)
2007
74.9 mm (2.9 in)
2008
55.9 mm (2.2 in)
2009
49.8 mm (2.0 in)
2010
60.5 mm (2.4 in)
2011
38.1 mm (1.5 in)
2012
69.8 mm (2.7 in)
2013
77.7 mm (3.1 in)
2014
63.5 mm (2.5 in)
2015
119.1 mm (4.7 in)
2016
48.0 mm (1.9 in)
2017
87.4 mm (3.4 in)
2018
74.2 mm (2.9 in)
2019
43.2 mm (1.7 in)
2020
50.5 mm (2.0 in)
2021
84.8 mm (3.3 in)
2022
67.1 mm (2.6 in)
2023
74.7 mm (2.9 in)
2024
78.7 mm (3.1 in)
2025
50.8 mm (2.0 in)
2026
38.6 mm (1.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Grand Lake Stream, 1948 to 2026. The record is 164.6 mm (6.5 in) in 2023, marked on the chart; the median year is 86.2 mm (3.4 in).
Wettest five days (Rx5day) at Grand Lake Stream by year
Year
Wettest five days (Rx5day)
1948
62.8 mm (2.5 in)
1949
72.2 mm (2.8 in)
1950
114.4 mm (4.5 in)
1951
65.9 mm (2.6 in)
1961
62.3 mm (2.5 in)
1962
77.9 mm (3.1 in)
1963
116.6 mm (4.6 in)
1964
67.8 mm (2.7 in)
1965
76.5 mm (3.0 in)
1966
87.8 mm (3.5 in)
1967
102.6 mm (4.0 in)
1968
67.0 mm (2.6 in)
1969
130.8 mm (5.1 in)
1970
105.7 mm (4.2 in)
1971
81.8 mm (3.2 in)
1972
77.5 mm (3.1 in)
1973
117.6 mm (4.6 in)
1974
78.0 mm (3.1 in)
1975
81.6 mm (3.2 in)
1976
95.5 mm (3.8 in)
1977
94.8 mm (3.7 in)
1978
84.6 mm (3.3 in)
1979
101.9 mm (4.0 in)
1980
81.8 mm (3.2 in)
1981
135.3 mm (5.3 in)
1982
88.9 mm (3.5 in)
1983
103.4 mm (4.1 in)
1984
135.1 mm (5.3 in)
1985
64.5 mm (2.5 in)
1986
66.0 mm (2.6 in)
1987
68.3 mm (2.7 in)
1988
68.0 mm (2.7 in)
1989
117.9 mm (4.6 in)
1990
78.8 mm (3.1 in)
1991
106.2 mm (4.2 in)
1992
133.2 mm (5.2 in)
1993
115.8 mm (4.6 in)
1994
71.2 mm (2.8 in)
1995
80.6 mm (3.2 in)
1996
81.5 mm (3.2 in)
1997
51.1 mm (2.0 in)
1998
84.4 mm (3.3 in)
1999
104.2 mm (4.1 in)
2000
64.0 mm (2.5 in)
2001
61.7 mm (2.4 in)
2002
76.5 mm (3.0 in)
2003
89.5 mm (3.5 in)
2004
68.3 mm (2.7 in)
2005
155.2 mm (6.1 in)
2006
105.2 mm (4.1 in)
2007
96.0 mm (3.8 in)
2008
94.8 mm (3.7 in)
2009
70.7 mm (2.8 in)
2010
102.7 mm (4.0 in)
2011
63.7 mm (2.5 in)
2012
112.3 mm (4.4 in)
2013
120.4 mm (4.7 in)
2014
106.2 mm (4.2 in)
2015
153.9 mm (6.1 in)
2016
62.7 mm (2.5 in)
2017
129.3 mm (5.1 in)
2018
80.6 mm (3.2 in)
2019
77.2 mm (3.0 in)
2020
97.7 mm (3.8 in)
2021
94.2 mm (3.7 in)
2022
112.1 mm (4.4 in)
2023
164.6 mm (6.5 in)
2024
91.4 mm (3.6 in)
2025
60.0 mm (2.4 in)
2026
48.0 mm (1.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Grand Lake Stream, 1948 to 2026. The record is 26 days in 1965, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Grand Lake Stream by year
Year
Longest dry spell (CDD)
1948
17 days
1949
15 days
1950
17 days
1951
15 days
1961
9 days
1962
19 days
1963
22 days
1964
16 days
1965
26 days
1966
20 days
1967
12 days
1968
18 days
1969
15 days
1970
23 days
1971
19 days
1972
12 days
1973
14 days
1974
18 days
1975
19 days
1976
21 days
1977
12 days
1978
21 days
1979
19 days
1980
21 days
1981
21 days
1982
15 days
1983
9 days
1984
21 days
1985
24 days
1986
15 days
1987
18 days
1988
15 days
1989
17 days
1990
17 days
1991
11 days
1992
15 days
1993
15 days
1994
21 days
1995
11 days
1996
13 days
1997
19 days
1998
13 days
1999
19 days
2000
11 days
2001
22 days
2002
17 days
2003
15 days
2004
14 days
2005
13 days
2006
11 days
2007
26 days
2008
18 days
2009
24 days
2010
20 days
2011
10 days
2012
12 days
2013
14 days
2014
15 days
2015
16 days
2016
19 days
2017
18 days
2018
13 days
2019
10 days
2020
19 days
2021
24 days
2022
16 days
2023
17 days
2024
23 days
2025
14 days
2026
14 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 Grand Lake Stream falls on 15 May and the median first autumn frost on 4 October, which leaves a median of 145 days between them.
Fitted over all years, the growing season changes by +3.6 days per decade at this station.
Frost dates and growing season at Grand Lake Stream
Measure
Median, all years
Earliest period
Recent period (1990 to 2025)
Recent against earliest
Fitted trend
Last spring frost
15 May
n/a
14 May
n/a
-1.6 days per decade
First autumn frost
4 October
n/a
6 October
n/a
+2.0 days per decade
Growing days
145 days
n/a
149 days
n/a
+3.6 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
62 years, 1949 to 2025
A day with at least 62.1 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 99.8 mm (3.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Grand Lake Stream: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
62.1 mm (2.4 in)
5 years
76.3 mm (3.0 in)
10 years
83.7 mm (3.3 in)
25 years
91.3 mm (3.6 in)
50 years
96.0 mm (3.8 in)
100 years
99.8 mm (3.9 in)
Longer than the 62 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, 62 years of values from 1949 to 2025.
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: 119.1 mm (4.7 in) in 2015; 92.2 mm (3.6 in) in 2005; 87.4 mm (3.4 in) in 2017.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Grand Lake Stream, at 1998 and 2007. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1998 ran 0.9 C (1.6 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 2007 ran 1.2 C (2.2 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Grand Lake Stream, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1998
-0.9
-1.6
likely
5
2007
+1.2
+2.2
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.
Climate Twins
2006 to 2025 against 1961 to 1990
Over 2006 to 2025, Grand Lake Stream had a mean temperature of 7.0 C (44.7 F) and 1,192.7 mm (47.0 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Little Valley (United States, 944 km away), Colden 1 N (United States, 916 km away) and Cummington Hill (United States, 512 km away).
Climate twins of Grand Lake Stream: stations whose 1961 to 1990 climate is closest to its 2006 to 2025 climate
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Data for Grand Lake Stream standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grand Lake Stream 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.