Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Rocky Mtn House. 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 Rocky Mtn House, 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)
-43.9 C (-47.0 F)
n/a
n/a
Feb
16.1 C (61.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Mar
21.7 C (71.1 F)
-38.9 C (-38.0 F)
n/a
n/a
Apr
27.8 C (82.0 F)
-23.9 C (-11.0 F)
n/a
n/a
May
30.6 C (87.1 F)
-15.6 C (3.9 F)
n/a
n/a
Jun
32.2 C (90.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
33.3 C (91.9 F)
0.0 C (32.0 F)
n/a
n/a
Aug
32.2 C (90.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
32.8 C (91.0 F)
-9.4 C (15.1 F)
n/a
n/a
Oct
29.4 C (84.9 F)
-21.1 C (-6.0 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-34.4 C (-29.9 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-42.9 C (-45.2 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Rocky Mtn House still stand. 1951 holds the most, with 85.
Standing records at Rocky Mtn House by the year they were set
Year set
Standing records
1945
33
1946
31
1947
43
1948
32
1949
72
1950
57
1951
85
1952
40
1953
40
1954
76
1955
54
1956
64
1957
52
1958
44
1959
41
1960
22
1961
52
1962
39
1963
44
1964
47
1965
59
1966
33
1967
46
1968
41
1969
36
1970
40
1971
37
1972
48
1973
32
1974
12
1975
41
1976
28
1977
43
All-Time Record Progression
1 new records
1 all-time records were set at Rocky Mtn House between 27 July 1975 and 27 July 1975. Each dot is a new record.
When Rocky Mtn House set new all-time records
Date
Kind
Detail
1975-07-27
Record high maximum temperature
Record high maximum temperature 33.3 C (91.9 F)
Wettest Day of Each Month
Jul: 76.7 mm (3.0 in)
The wettest day on record for each calendar month at Rocky Mtn House. The most was 76.7 mm (3.0 in) on 16 July 1949.
Record daily precipitation for each month at Rocky Mtn House
Month
Record daily precipitation (mm)
Date
Jan
25.1 mm (1.0 in)
13 January 1963
Feb
19.3 mm (0.8 in)
23 February 1947
Mar
37.1 mm (1.5 in)
30 March 1955
Apr
45.0 mm (1.8 in)
30 April 1951
May
63.8 mm (2.5 in)
28 May 1946
Jun
66.0 mm (2.6 in)
24 June 1972
Jul
76.7 mm (3.0 in)
16 July 1949
Aug
73.9 mm (2.9 in)
5 August 1966
Sep
35.6 mm (1.4 in)
25 September 1964
Oct
23.6 mm (0.9 in)
4 October 1974
Nov
15.0 mm (0.6 in)
4 November 1945
Dec
26.2 mm (1.0 in)
19 December 1945
Period of Record Coverage
1945 to 1978
Complete yearUnder 90 percent of days
34 years of record at Rocky Mtn House, 1945 to 1978. 1 years have data for under 90 percent of days and are left out of rankings: 1978.
Cooler than the station meanWarmer than the station mean
One stripe for each of 33 complete years at Rocky Mtn House, 1945 to 1977. Blue stripes are years cooler than the station's own mean of 2.6 C (36.7 F); red stripes are warmer. The coolest year was 1951, at 0.6 C (33.0 F), and the warmest was 1976, at 4.3 C (39.7 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Rocky Mtn House as warming stripes, 1945 to 1977
Year
Annual mean temperature
Difference from the station mean
1945
2.4 C
-0.22 C
1946
3.5 C
+0.88 C
1947
3.2 C
+0.58 C
1948
2.4 C
-0.20 C
1949
2.5 C
-0.08 C
1950
0.8 C
-1.83 C
1951
0.6 C
-2.04 C
1952
3.3 C
+0.67 C
1953
4.0 C
+1.42 C
1954
2.5 C
-0.12 C
1955
1.1 C
-1.55 C
1956
2.5 C
-0.09 C
1957
2.5 C
-0.12 C
1958
3.9 C
+1.28 C
1959
2.5 C
-0.13 C
1960
3.1 C
+0.46 C
1961
3.6 C
+0.98 C
1962
3.4 C
+0.79 C
1963
3.7 C
+1.09 C
1964
2.5 C
-0.16 C
1965
2.0 C
-0.65 C
1966
1.7 C
-0.96 C
1967
2.8 C
+0.21 C
1968
2.5 C
-0.13 C
1969
1.9 C
-0.73 C
1970
2.3 C
-0.32 C
1971
2.5 C
-0.11 C
1972
1.3 C
-1.30 C
1973
2.7 C
+0.07 C
1974
3.0 C
+0.38 C
1975
2.0 C
-0.57 C
1976
4.3 C
+1.68 C
1977
3.5 C
+0.85 C
The fitted trend in annual mean temperature here over 1945 to 1977 is 0.1 C (-0.3 to 0.4) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.5 to 0.8) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Rocky Mtn House
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.3 to 0.4) per decade
0.1 F (-0.5 to 0.8) per decade
1945 to 1977
33
Not clearly different from zero
Mean daily maximum
0.1 C (-0.3 to 0.5) per decade
0.1 F (-0.6 to 0.8) per decade
1945 to 1977
33
Not clearly different from zero
Mean daily minimum
0.1 C (-0.2 to 0.4) per decade
0.1 F (-0.4 to 0.7) per decade
1945 to 1977
33
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
1945 to 1978
Yearly extremes at Rocky Mtn House: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
33.3 C (91.9 F)
1975
30.7 C (87.2 F)
34
Coldest night (TNn)
-43.9 C (-47.0 F)
1972
-37.2 C (-35.0 F)
34
Wettest day (Rx1day)
76.7 mm (3.0 in)
1949
35.5 mm (1.4 in)
34
Wettest five days (Rx5day)
134.3 mm (5.3 in)
1972
67.3 mm (2.6 in)
34
Longest dry spell (CDD)
40 days
1953
25 days
34
Hottest day (TXx)
The hottest day of the year at Rocky Mtn House, 1945 to 1978. The record is 33.3 C (91.9 F) in 1975, marked on the chart; the median year is 30.7 C (87.2 F).
Hottest day (TXx) at Rocky Mtn House by year
Year
Hottest day (TXx)
1945
30.0 C (86.0 F)
1946
32.2 C (90.0 F)
1947
28.3 C (82.9 F)
1948
28.9 C (84.0 F)
1949
31.7 C (89.1 F)
1950
31.1 C (88.0 F)
1951
30.0 C (86.0 F)
1952
30.0 C (86.0 F)
1953
28.9 C (84.0 F)
1954
31.1 C (88.0 F)
1955
32.2 C (90.0 F)
1956
31.1 C (88.0 F)
1957
28.3 C (82.9 F)
1958
30.0 C (86.0 F)
1959
31.7 C (89.1 F)
1960
31.1 C (88.0 F)
1961
32.8 C (91.0 F)
1962
28.9 C (84.0 F)
1963
29.4 C (84.9 F)
1964
31.7 C (89.1 F)
1965
30.6 C (87.1 F)
1966
30.0 C (86.0 F)
1967
32.8 C (91.0 F)
1968
30.0 C (86.0 F)
1969
31.7 C (89.1 F)
1970
32.2 C (90.0 F)
1971
32.2 C (90.0 F)
1972
30.6 C (87.1 F)
1973
31.1 C (88.0 F)
1974
30.0 C (86.0 F)
1975
33.3 C (91.9 F)
1976
27.8 C (82.0 F)
1977
30.7 C (87.3 F)
1978
3.6 C (38.5 F)
Coldest night (TNn)
The coldest night of the year at Rocky Mtn House, 1945 to 1978. The record is -43.9 C (-47.0 F) in 1972, marked on the chart; the median year is -37.2 C (-35.0 F).
Coldest night (TNn) at Rocky Mtn House by year
Year
Coldest night (TNn)
1945
-33.9 C (-29.0 F)
1946
-32.8 C (-27.0 F)
1947
-40.6 C (-41.1 F)
1948
-34.4 C (-29.9 F)
1949
-38.9 C (-38.0 F)
1950
-42.2 C (-44.0 F)
1951
-38.9 C (-38.0 F)
1952
-38.9 C (-38.0 F)
1953
-31.7 C (-25.1 F)
1954
-41.1 C (-42.0 F)
1955
-37.2 C (-35.0 F)
1956
-35.6 C (-32.1 F)
1957
-37.8 C (-36.0 F)
1958
-32.8 C (-27.0 F)
1959
-32.8 C (-27.0 F)
1960
-32.8 C (-27.0 F)
1961
-36.1 C (-33.0 F)
1962
-37.2 C (-35.0 F)
1963
-37.8 C (-36.0 F)
1964
-36.7 C (-34.1 F)
1965
-38.3 C (-36.9 F)
1966
-39.4 C (-38.9 F)
1967
-33.9 C (-29.0 F)
1968
-36.7 C (-34.1 F)
1969
-40.6 C (-41.1 F)
1970
-41.1 C (-42.0 F)
1971
-38.3 C (-36.9 F)
1972
-43.9 C (-47.0 F)
1973
-35.6 C (-32.1 F)
1974
-37.2 C (-35.0 F)
1975
-35.6 C (-32.1 F)
1976
-34.4 C (-29.9 F)
1977
-42.9 C (-45.2 F)
1978
-38.4 C (-37.1 F)
Wettest day (Rx1day)
The wettest day of the year at Rocky Mtn House, 1945 to 1978. The record is 76.7 mm (3.0 in) in 1949, marked on the chart; the median year is 35.5 mm (1.4 in).
Wettest day (Rx1day) at Rocky Mtn House by year
Year
Wettest day (Rx1day)
1945
52.3 mm (2.1 in)
1946
63.8 mm (2.5 in)
1947
33.3 mm (1.3 in)
1948
31.8 mm (1.3 in)
1949
76.7 mm (3.0 in)
1950
20.1 mm (0.8 in)
1951
45.0 mm (1.8 in)
1952
45.0 mm (1.8 in)
1953
34.8 mm (1.4 in)
1954
43.4 mm (1.7 in)
1955
37.1 mm (1.5 in)
1956
34.0 mm (1.3 in)
1957
21.6 mm (0.9 in)
1958
27.4 mm (1.1 in)
1959
61.0 mm (2.4 in)
1960
24.9 mm (1.0 in)
1961
24.1 mm (0.9 in)
1962
30.5 mm (1.2 in)
1963
61.2 mm (2.4 in)
1964
35.6 mm (1.4 in)
1965
32.8 mm (1.3 in)
1966
73.9 mm (2.9 in)
1967
20.3 mm (0.8 in)
1968
67.8 mm (2.7 in)
1969
24.9 mm (1.0 in)
1970
56.9 mm (2.2 in)
1971
35.3 mm (1.4 in)
1972
66.0 mm (2.6 in)
1973
27.2 mm (1.1 in)
1974
45.5 mm (1.8 in)
1975
24.1 mm (0.9 in)
1976
49.3 mm (1.9 in)
1977
59.6 mm (2.3 in)
1978
9.4 mm (0.37 in)
Wettest five days (Rx5day)
The wettest five days of the year at Rocky Mtn House, 1945 to 1978. The record is 134.3 mm (5.3 in) in 1972, marked on the chart; the median year is 67.3 mm (2.6 in).
Wettest five days (Rx5day) at Rocky Mtn House by year
Year
Wettest five days (Rx5day)
1945
99.2 mm (3.9 in)
1946
70.2 mm (2.8 in)
1947
49.4 mm (1.9 in)
1948
68.1 mm (2.7 in)
1949
100.8 mm (4.0 in)
1950
42.9 mm (1.7 in)
1951
82.9 mm (3.3 in)
1952
66.3 mm (2.6 in)
1953
62.0 mm (2.4 in)
1954
87.6 mm (3.4 in)
1955
45.0 mm (1.8 in)
1956
57.1 mm (2.2 in)
1957
43.9 mm (1.7 in)
1958
61.8 mm (2.4 in)
1959
67.4 mm (2.7 in)
1960
41.7 mm (1.6 in)
1961
53.8 mm (2.1 in)
1962
57.4 mm (2.3 in)
1963
70.4 mm (2.8 in)
1964
79.3 mm (3.1 in)
1965
81.9 mm (3.2 in)
1966
86.3 mm (3.4 in)
1967
45.2 mm (1.8 in)
1968
128.8 mm (5.1 in)
1969
74.1 mm (2.9 in)
1970
85.6 mm (3.4 in)
1971
68.3 mm (2.7 in)
1972
134.3 mm (5.3 in)
1973
42.6 mm (1.7 in)
1974
64.5 mm (2.5 in)
1975
33.6 mm (1.3 in)
1976
67.1 mm (2.6 in)
1977
81.5 mm (3.2 in)
1978
21.7 mm (0.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Rocky Mtn House, 1945 to 1978. The record is 40 days in 1953, marked on the chart; the median year is 25 days.
Longest dry spell (CDD) at Rocky Mtn House by year
Year
Longest dry spell (CDD)
1945
26 days
1946
22 days
1947
17 days
1948
36 days
1949
29 days
1950
23 days
1951
16 days
1952
38 days
1953
40 days
1954
33 days
1955
16 days
1956
24 days
1957
22 days
1958
26 days
1959
18 days
1960
19 days
1961
25 days
1962
27 days
1963
30 days
1964
20 days
1965
30 days
1966
26 days
1967
27 days
1968
21 days
1969
29 days
1970
22 days
1971
20 days
1972
24 days
1973
31 days
1974
30 days
1975
19 days
1976
20 days
1977
36 days
1978
15 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
33 years with a frost
Across 33 years with a frost, the median last spring frost at Rocky Mtn House falls on 26 May and the median first autumn frost on 8 September, which leaves a median of 100 days between them.
Fitted over all years, the growing season changes by +11.1 days per decade at this station.
Frost dates and growing season at Rocky Mtn House
Measure
Median, all years
Earliest period
Recent period (1948 to 1977)
Recent against earliest
Fitted trend
Last spring frost
26 May
n/a
25 May
n/a
-5.4 days per decade
First autumn frost
8 September
n/a
8 September
n/a
+5.7 days per decade
Growing days
100 days
n/a
100 days
n/a
+11.1 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
33 years, 1945 to 1977
A day with at least 39.3 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 96.5 mm (3.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Rocky Mtn House: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
39.3 mm (1.5 in)
5 years
55.0 mm (2.2 in)
10 years
65.3 mm (2.6 in)
25 years
78.0 mm (3.1 in)
50 years
87.4 mm (3.4 in)
Longer than the 33 years of record
100 years
96.5 mm (3.8 in)
Longer than the 33 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, 33 years of values from 1945 to 1977.
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: 76.7 mm (3.0 in) in 1949; 73.9 mm (2.9 in) in 1966; 67.8 mm (2.7 in) in 1968.
Download the Data
Data for Rocky Mtn House standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rocky Mtn House 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.