Record envelope, standing records and threshold days for Canyon Ferry Dam (USC00241470), Montana, United States, with 90 years of record.
Key Facts for Canyon Ferry Dam
Canyon Ferry Dam (USC00241470) is a weather station in Montana, United States at 46.65 latitude and -111.73 longitude, 1,119 m (3,672 ft) above sea level.
The station reports from 1907 to 1996, 90 years of record.
1,464 records set at Canyon Ferry Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Canyon Ferry Dam set a daily record low minimum temperature of 5.6 C (42.1 F) on 8 July 1996.
About the Station
Location: Montana, United States, 46.65 latitude, -111.73 longitude.
Elevation: 1,119 m (3,672 ft).
Period of record: 1907 to 1996, 90 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 Canyon Ferry 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 Canyon Ferry Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
13.9 C (57.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Feb
20.0 C (68.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Mar
23.9 C (75.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-14.4 C (6.1 F)
n/a
n/a
May
32.8 C (91.0 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
37.2 C (99.0 F)
-0.6 C (30.9 F)
n/a
n/a
Jul
37.8 C (100.0 F)
0.6 C (33.1 F)
n/a
n/a
Aug
41.1 C (106.0 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
33.9 C (93.0 F)
-7.2 C (19.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Nov
20.6 C (69.1 F)
-31.7 C (-25.1 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-35.0 C (-31.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Canyon Ferry Dam still stand. 1969 holds the most, with 66.
Standing records at Canyon Ferry Dam by the year they were set
Year set
Standing records
1957
57
1958
31
1959
36
1960
35
1961
59
1962
39
1963
47
1964
29
1965
42
1966
57
1967
47
1968
42
1969
66
1970
36
1971
30
1972
53
1973
32
1974
40
1975
38
1976
23
1977
20
1978
26
1979
25
1980
30
1981
17
1982
24
1983
34
1984
34
1985
51
1986
43
1987
35
1988
37
1989
49
1990
41
1991
24
1992
24
1993
39
1994
24
1995
30
1996
18
All-Time Record Progression
1 new records
1 all-time records were set at Canyon Ferry Dam between 2 February 1989 and 2 February 1989. Each dot is a new record.
When Canyon Ferry Dam set new all-time records
Date
Kind
Detail
1989-02-02
Record low maximum temperature
Record low maximum temperature -28.9 C (-20.0 F)
Wettest Day of Each Month
May: 59.2 mm (2.3 in)
The wettest day on record for each calendar month at Canyon Ferry Dam. The most was 59.2 mm (2.3 in) on 22 May 1981.
Record daily precipitation for each month at Canyon Ferry Dam
Month
Record daily precipitation (mm)
Date
Jan
14.7 mm (0.6 in)
21 January 1969
Feb
9.4 mm (0.37 in)
15 February 1986
Mar
20.6 mm (0.8 in)
17 March 1981
Apr
24.9 mm (1.0 in)
26 April 1975
May
59.2 mm (2.3 in)
22 May 1981
Jun
38.6 mm (1.5 in)
19 June 1979
Jul
53.6 mm (2.1 in)
10 July 1983
Aug
41.9 mm (1.6 in)
20 August 1974
Sep
33.0 mm (1.3 in)
20 September 1968
Oct
21.8 mm (0.9 in)
3 October 1967
Nov
14.2 mm (0.6 in)
6 November 1973
Dec
12.7 mm (0.5 in)
12 December 1963
Period of Record Coverage
1907 to 1996
Complete yearUnder 90 percent of days
42 years of record at Canyon Ferry Dam, 1907 to 1996. 3 years have data for under 90 percent of days and are left out of rankings: 1907, 1955, 1996.
Cooler than the station meanWarmer than the station mean
One stripe for each of 38 complete years at Canyon Ferry Dam, 1958 to 1995. Blue stripes are years cooler than the station's own mean of 7.5 C (45.5 F); red stripes are warmer. The coolest year was 1993, at 5.6 C (42.0 F), and the warmest was 1987, at 8.9 C (47.9 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Canyon Ferry Dam as warming stripes, 1958 to 1995
Year
Annual mean temperature
Difference from the station mean
1958
8.4 C
+0.88 C
1959
6.8 C
-0.65 C
1960
7.2 C
-0.29 C
1961
8.8 C
+1.34 C
1962
7.4 C
-0.08 C
1963
7.8 C
+0.33 C
1964
7.0 C
-0.46 C
1965
7.2 C
-0.33 C
1966
7.6 C
+0.14 C
1967
8.0 C
+0.55 C
1968
7.6 C
+0.13 C
1969
6.8 C
-0.64 C
1970
7.9 C
+0.40 C
1971
7.4 C
-0.06 C
1972
7.3 C
-0.19 C
1973
8.0 C
+0.47 C
1974
8.5 C
+1.00 C
1975
6.3 C
-1.22 C
1976
8.1 C
+0.66 C
1977
7.4 C
-0.13 C
1978
6.2 C
-1.32 C
1979
6.7 C
-0.74 C
1980
7.1 C
-0.35 C
1981
8.3 C
+0.86 C
1982
6.7 C
-0.83 C
1983
7.9 C
+0.39 C
1984
7.6 C
+0.15 C
1985
5.8 C
-1.64 C
1986
8.0 C
+0.52 C
1987
8.9 C
+1.38 C
1988
8.8 C
+1.29 C
1989
6.6 C
-0.84 C
1990
7.9 C
+0.37 C
1991
7.7 C
+0.24 C
1992
7.9 C
+0.46 C
1993
5.6 C
-1.93 C
1994
7.9 C
+0.40 C
1995
7.2 C
-0.26 C
The fitted trend in annual mean temperature here over 1958 to 1995 is -0.1 C (-0.3 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.5 to 0.3) 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 Canyon Ferry Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.3 to 0.2) per decade
-0.1 F (-0.5 to 0.3) per decade
1958 to 1995
38
Not clearly different from zero
Mean daily maximum
-0.2 C (-0.5 to 0.1) per decade
-0.4 F (-0.9 to 0.2) per decade
1958 to 1995
38
Not clearly different from zero
Mean daily minimum
0.1 C (-0.1 to 0.3) per decade
0.1 F (-0.3 to 0.5) per decade
1958 to 1995
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
1907 to 1996
Yearly extremes at Canyon Ferry Dam: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1961
35.0 C (95.0 F)
42
Coldest night (TNn)
-37.8 C (-36.0 F)
1962
-28.8 C (-19.9 F)
42
Wettest day (Rx1day)
59.2 mm (2.3 in)
1981
22.0 mm (0.9 in)
42
Wettest five days (Rx5day)
81.8 mm (3.2 in)
1981
37.1 mm (1.5 in)
40
Longest dry spell (CDD)
83 days
1964
34 days
42
Hottest day (TXx)
The hottest day of the year at Canyon Ferry Dam, 1907 to 1996. The record is 41.1 C (106.0 F) in 1961, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Canyon Ferry Dam by year
Year
Hottest day (TXx)
1907
6.1 C (43.0 F)
1955
20.0 C (68.0 F)
1957
35.0 C (95.0 F)
1958
34.4 C (93.9 F)
1959
34.4 C (93.9 F)
1960
36.7 C (98.1 F)
1961
41.1 C (106.0 F)
1962
32.2 C (90.0 F)
1963
36.7 C (98.1 F)
1964
36.1 C (97.0 F)
1965
37.2 C (99.0 F)
1966
37.2 C (99.0 F)
1967
36.1 C (97.0 F)
1968
35.0 C (95.0 F)
1969
36.7 C (98.1 F)
1970
36.7 C (98.1 F)
1971
36.7 C (98.1 F)
1972
35.0 C (95.0 F)
1973
37.8 C (100.0 F)
1974
36.1 C (97.0 F)
1975
35.0 C (95.0 F)
1976
33.9 C (93.0 F)
1977
34.4 C (93.9 F)
1978
33.9 C (93.0 F)
1979
36.1 C (97.0 F)
1980
34.4 C (93.9 F)
1981
36.1 C (97.0 F)
1982
33.3 C (91.9 F)
1983
36.1 C (97.0 F)
1984
34.4 C (93.9 F)
1985
37.8 C (100.0 F)
1986
36.7 C (98.1 F)
1987
33.9 C (93.0 F)
1988
36.7 C (98.1 F)
1989
35.6 C (96.1 F)
1990
37.2 C (99.0 F)
1991
35.0 C (95.0 F)
1992
35.0 C (95.0 F)
1993
31.1 C (88.0 F)
1994
35.0 C (95.0 F)
1995
35.0 C (95.0 F)
1996
33.3 C (91.9 F)
Coldest night (TNn)
The coldest night of the year at Canyon Ferry Dam, 1907 to 1996. The record is -37.8 C (-36.0 F) in 1962, marked on the chart; the median year is -28.8 C (-19.9 F).
Coldest night (TNn) at Canyon Ferry Dam by year
Year
Coldest night (TNn)
1907
-1.1 C (30.0 F)
1955
5.6 C (42.1 F)
1957
-36.1 C (-33.0 F)
1958
-20.6 C (-5.1 F)
1959
-31.7 C (-25.1 F)
1960
-29.4 C (-20.9 F)
1961
-27.2 C (-17.0 F)
1962
-37.8 C (-36.0 F)
1963
-33.3 C (-27.9 F)
1964
-32.2 C (-26.0 F)
1965
-22.8 C (-9.0 F)
1966
-23.9 C (-11.0 F)
1967
-26.7 C (-16.1 F)
1968
-31.7 C (-25.1 F)
1969
-37.2 C (-35.0 F)
1970
-23.9 C (-11.0 F)
1971
-32.2 C (-26.0 F)
1972
-33.3 C (-27.9 F)
1973
-30.6 C (-23.1 F)
1974
-31.1 C (-24.0 F)
1975
-27.2 C (-17.0 F)
1976
-27.8 C (-18.0 F)
1977
-23.9 C (-11.0 F)
1978
-32.8 C (-27.0 F)
1979
-34.4 C (-29.9 F)
1980
-29.4 C (-20.9 F)
1981
-32.2 C (-26.0 F)
1982
-26.7 C (-16.1 F)
1983
-35.0 C (-31.0 F)
1984
-25.0 C (-13.0 F)
1985
-27.2 C (-17.0 F)
1986
-22.8 C (-9.0 F)
1987
-19.4 C (-2.9 F)
1988
-23.3 C (-9.9 F)
1989
-35.6 C (-32.1 F)
1990
-32.2 C (-26.0 F)
1991
-23.3 C (-9.9 F)
1992
-27.8 C (-18.0 F)
1993
-28.3 C (-18.9 F)
1994
-30.6 C (-23.1 F)
1995
-24.4 C (-11.9 F)
1996
-35.0 C (-31.0 F)
Wettest day (Rx1day)
The wettest day of the year at Canyon Ferry Dam, 1907 to 1996. The record is 59.2 mm (2.3 in) in 1981, marked on the chart; the median year is 22.0 mm (0.9 in).
Wettest day (Rx1day) at Canyon Ferry Dam by year
Year
Wettest day (Rx1day)
1907
0.0 mm (0.00 in)
1955
0.0 mm (0.00 in)
1957
26.7 mm (1.1 in)
1958
16.0 mm (0.6 in)
1959
18.0 mm (0.7 in)
1960
16.5 mm (0.6 in)
1961
14.5 mm (0.6 in)
1962
36.1 mm (1.4 in)
1963
20.3 mm (0.8 in)
1964
34.3 mm (1.4 in)
1965
21.6 mm (0.9 in)
1966
13.5 mm (0.5 in)
1967
21.8 mm (0.9 in)
1968
33.0 mm (1.3 in)
1969
27.9 mm (1.1 in)
1970
20.8 mm (0.8 in)
1971
33.5 mm (1.3 in)
1972
13.0 mm (0.5 in)
1973
21.8 mm (0.9 in)
1974
41.9 mm (1.6 in)
1975
32.5 mm (1.3 in)
1976
23.4 mm (0.9 in)
1977
31.2 mm (1.2 in)
1978
20.8 mm (0.8 in)
1979
38.6 mm (1.5 in)
1980
38.1 mm (1.5 in)
1981
59.2 mm (2.3 in)
1982
22.1 mm (0.9 in)
1983
53.6 mm (2.1 in)
1984
20.3 mm (0.8 in)
1985
28.4 mm (1.1 in)
1986
21.8 mm (0.9 in)
1987
22.4 mm (0.9 in)
1988
29.2 mm (1.1 in)
1989
18.0 mm (0.7 in)
1990
19.3 mm (0.8 in)
1991
26.7 mm (1.1 in)
1992
19.3 mm (0.8 in)
1993
23.4 mm (0.9 in)
1994
14.7 mm (0.6 in)
1995
27.2 mm (1.1 in)
1996
15.2 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Canyon Ferry Dam, 1907 to 1996. The record is 81.8 mm (3.2 in) in 1981, marked on the chart; the median year is 37.1 mm (1.5 in).
Wettest five days (Rx5day) at Canyon Ferry Dam by year
Year
Wettest five days (Rx5day)
1907
n/a
1955
n/a
1957
35.4 mm (1.4 in)
1958
35.4 mm (1.4 in)
1959
28.5 mm (1.1 in)
1960
29.4 mm (1.2 in)
1961
23.6 mm (0.9 in)
1962
48.4 mm (1.9 in)
1963
44.9 mm (1.8 in)
1964
71.9 mm (2.8 in)
1965
46.3 mm (1.8 in)
1966
14.3 mm (0.6 in)
1967
35.3 mm (1.4 in)
1968
55.3 mm (2.2 in)
1969
63.5 mm (2.5 in)
1970
28.5 mm (1.1 in)
1971
39.9 mm (1.6 in)
1972
17.0 mm (0.7 in)
1973
21.8 mm (0.9 in)
1974
42.4 mm (1.7 in)
1975
55.1 mm (2.2 in)
1976
45.8 mm (1.8 in)
1977
44.2 mm (1.7 in)
1978
40.4 mm (1.6 in)
1979
56.9 mm (2.2 in)
1980
80.1 mm (3.2 in)
1981
81.8 mm (3.2 in)
1982
37.1 mm (1.5 in)
1983
73.2 mm (2.9 in)
1984
28.4 mm (1.1 in)
1985
38.8 mm (1.5 in)
1986
35.5 mm (1.4 in)
1987
37.1 mm (1.5 in)
1988
29.2 mm (1.1 in)
1989
24.9 mm (1.0 in)
1990
27.9 mm (1.1 in)
1991
46.4 mm (1.8 in)
1992
28.5 mm (1.1 in)
1993
36.1 mm (1.4 in)
1994
27.8 mm (1.1 in)
1995
40.9 mm (1.6 in)
1996
13.3 mm (0.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Canyon Ferry Dam, 1907 to 1996. The record is 83 days in 1964, marked on the chart; the median year is 34 days.
Longest dry spell (CDD) at Canyon Ferry Dam by year
Year
Longest dry spell (CDD)
1907
1 day
1955
1 day
1957
51 days
1958
21 days
1959
46 days
1960
54 days
1961
50 days
1962
25 days
1963
31 days
1964
83 days
1965
41 days
1966
25 days
1967
31 days
1968
24 days
1969
35 days
1970
25 days
1971
28 days
1972
39 days
1973
25 days
1974
45 days
1975
30 days
1976
50 days
1977
45 days
1978
54 days
1979
38 days
1980
26 days
1981
24 days
1982
31 days
1983
48 days
1984
28 days
1985
32 days
1986
35 days
1987
71 days
1988
59 days
1989
21 days
1990
61 days
1991
59 days
1992
45 days
1993
25 days
1994
35 days
1995
21 days
1996
23 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 Canyon Ferry Dam falls on 14 May and the median first autumn frost on 29 September, which leaves a median of 134 days between them.
Fitted over all years, the growing season changes by +0.8 days per decade at this station.
Frost dates and growing season at Canyon Ferry Dam
Measure
Median, all years
Earliest period
Recent period (1966 to 1995)
Recent against earliest
Fitted trend
Last spring frost
14 May
n/a
14 May
n/a
-1.7 days per decade
First autumn frost
29 September
n/a
29 September
n/a
-0.9 days per decade
Growing days
134 days
n/a
134 days
n/a
+0.8 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
39 years, 1957 to 1995
A day with at least 23.8 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 64.6 mm (2.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Canyon Ferry 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
23.8 mm (0.9 in)
5 years
32.6 mm (1.3 in)
10 years
39.3 mm (1.5 in)
25 years
48.6 mm (1.9 in)
50 years
56.3 mm (2.2 in)
Longer than the 39 years of record
100 years
64.6 mm (2.5 in)
Longer than the 39 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, 39 years of values from 1957 to 1995.
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: 59.2 mm (2.3 in) in 1981; 53.6 mm (2.1 in) in 1983; 41.9 mm (1.6 in) in 1974.
Download the Data
Data for Canyon Ferry Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Canyon Ferry 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.