Record envelope, standing records and threshold days for Rock Springs 7 SE (USC00247140), Montana, United States, with 36 years of record.
Key Facts for Rock Springs 7 SE
Rock Springs 7 SE (USC00247140) is a weather station in Montana, United States at 46.78 latitude and -106.13 longitude, 976 m (3,202 ft) above sea level.
The station reports from 1915 to 1950, 36 years of record.
1,464 records set at Rock Springs 7 SE still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Rock Springs 7 SE set a monthly record daily snowfall of 10.2 cm (4.0 in) on 30 September 1950.
About the Station
Location: Montana, United States, 46.78 latitude, -106.13 longitude.
Elevation: 976 m (3,202 ft).
Period of record: 1915 to 1950, 36 years.
Eligible elements: tmax, tmin, prcp, snow.
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 Rock Springs 7 SE. 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 Rock Springs 7 SE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.3 C (64.9 F)
-39.4 C (-38.9 F)
n/a
n/a
Feb
20.0 C (68.0 F)
-41.7 C (-43.1 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-31.1 C (-24.0 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-23.3 C (-9.9 F)
n/a
n/a
May
40.6 C (105.1 F)
-12.2 C (10.0 F)
n/a
n/a
Jun
41.1 C (106.0 F)
-2.2 C (28.0 F)
n/a
n/a
Jul
42.2 C (108.0 F)
0.0 C (32.0 F)
n/a
n/a
Aug
42.2 C (108.0 F)
-1.7 C (28.9 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-11.1 C (12.0 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-23.9 C (-11.0 F)
n/a
n/a
Nov
23.9 C (75.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Dec
20.6 C (69.1 F)
-37.2 C (-35.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Rock Springs 7 SE still stand. 1919 holds the most, with 81.
Standing records at Rock Springs 7 SE by the year they were set
Year set
Standing records
1915
10
1916
55
1917
55
1918
59
1919
81
1920
29
1921
53
1922
30
1923
19
1924
34
1925
38
1926
37
1927
42
1928
52
1929
26
1930
26
1931
75
1932
40
1933
34
1934
63
1935
36
1936
80
1937
36
1938
31
1939
62
1940
36
1941
24
1942
34
1943
38
1944
29
1945
39
1946
31
1947
18
1948
30
1949
32
1950
50
Wettest Day of Each Month
Jun: 79.2 mm (3.1 in)
The wettest day on record for each calendar month at Rock Springs 7 SE. The most was 79.2 mm (3.1 in) on 19 June 1921.
Record daily precipitation for each month at Rock Springs 7 SE
Month
Record daily precipitation (mm)
Date
Jan
17.8 mm (0.7 in)
28 January 1916
Feb
17.8 mm (0.7 in)
22 February 1922
Mar
17.8 mm (0.7 in)
9 March 1925
Apr
32.5 mm (1.3 in)
2 April 1940
May
27.4 mm (1.1 in)
30 May 1942
Jun
79.2 mm (3.1 in)
19 June 1921
Jul
47.5 mm (1.9 in)
7 July 1928
Aug
30.5 mm (1.2 in)
16 August 1918
Sep
43.2 mm (1.7 in)
7 September 1941
Oct
23.9 mm (0.9 in)
4 October 1940
Nov
19.1 mm (0.8 in)
1 November 1936
Dec
25.4 mm (1.0 in)
5 December 1932
Period of Record Coverage
1915 to 1950
Complete yearUnder 90 percent of days
36 years of record at Rock Springs 7 SE, 1915 to 1950. 9 years have data for under 90 percent of days and are left out of rankings: 1915, 1922, 1923, 1924, 1927, 1928, 1929, 1930 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 28 complete years at Rock Springs 7 SE, 1916 to 1949. Blue stripes are years cooler than the station's own mean of 6.3 C (43.3 F); red stripes are warmer. The coolest year was 1916, at 3.6 C (38.6 F), and the warmest was 1931, at 8.7 C (47.6 F). The strongest colour marks a difference of 2.7 C (4.9 F).
Annual mean temperature at Rock Springs 7 SE as warming stripes, 1916 to 1949
Year
Annual mean temperature
Difference from the station mean
1916
3.6 C
-2.64 C
1917
4.0 C
-2.33 C
1918
5.6 C
-0.69 C
1919
5.3 C
-0.95 C
1920
5.5 C
-0.78 C
1921
6.7 C
+0.43 C
1925
6.4 C
+0.14 C
1926
6.6 C
+0.32 C
1927
4.5 C
-1.77 C
1928
6.9 C
+0.58 C
1931
8.7 C
+2.37 C
1932
5.8 C
-0.46 C
1933
6.9 C
+0.60 C
1934
8.2 C
+1.94 C
1935
6.1 C
-0.22 C
1937
6.1 C
-0.14 C
1938
7.3 C
+0.98 C
1939
7.5 C
+1.24 C
1940
6.9 C
+0.65 C
1941
7.3 C
+1.06 C
1942
6.4 C
+0.12 C
1943
6.2 C
-0.08 C
1944
6.2 C
-0.08 C
1945
6.0 C
-0.28 C
1946
7.2 C
+0.92 C
1947
6.0 C
-0.31 C
1948
6.5 C
+0.24 C
1949
5.4 C
-0.87 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1915 to 1950
Yearly extremes at Rock Springs 7 SE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1935
39.4 C (102.9 F)
36
Coldest night (TNn)
-41.7 C (-43.1 F)
1936
-33.9 C (-29.0 F)
36
Wettest day (Rx1day)
79.2 mm (3.1 in)
1921
29.1 mm (1.1 in)
36
Wettest five days (Rx5day)
169.3 mm (6.7 in)
1921
42.1 mm (1.7 in)
36
Longest dry spell (CDD)
60 days
1934
36 days
36
Hottest day (TXx)
The hottest day of the year at Rock Springs 7 SE, 1915 to 1950. The record is 42.2 C (108.0 F) in 1935, marked on the chart; the median year is 39.4 C (102.9 F).
Hottest day (TXx) at Rock Springs 7 SE by year
Year
Hottest day (TXx)
1915
32.2 C (90.0 F)
1916
37.8 C (100.0 F)
1917
40.6 C (105.1 F)
1918
40.0 C (104.0 F)
1919
40.6 C (105.1 F)
1920
38.9 C (102.0 F)
1921
37.2 C (99.0 F)
1922
36.7 C (98.1 F)
1923
37.2 C (99.0 F)
1924
38.3 C (100.9 F)
1925
41.1 C (106.0 F)
1926
41.1 C (106.0 F)
1927
35.6 C (96.1 F)
1928
40.0 C (104.0 F)
1929
40.6 C (105.1 F)
1930
41.7 C (107.1 F)
1931
41.1 C (106.0 F)
1932
38.9 C (102.0 F)
1933
40.6 C (105.1 F)
1934
41.1 C (106.0 F)
1935
42.2 C (108.0 F)
1936
42.2 C (108.0 F)
1937
42.2 C (108.0 F)
1938
37.2 C (99.0 F)
1939
39.4 C (102.9 F)
1940
39.4 C (102.9 F)
1941
38.9 C (102.0 F)
1942
37.8 C (100.0 F)
1943
37.8 C (100.0 F)
1944
35.0 C (95.0 F)
1945
39.4 C (102.9 F)
1946
37.8 C (100.0 F)
1947
41.1 C (106.0 F)
1948
39.4 C (102.9 F)
1949
41.7 C (107.1 F)
1950
38.3 C (100.9 F)
Coldest night (TNn)
The coldest night of the year at Rock Springs 7 SE, 1915 to 1950. The record is -41.7 C (-43.1 F) in 1936, marked on the chart; the median year is -33.9 C (-29.0 F).
Coldest night (TNn) at Rock Springs 7 SE by year
Year
Coldest night (TNn)
1915
-25.6 C (-14.1 F)
1916
-37.2 C (-35.0 F)
1917
-39.4 C (-38.9 F)
1918
-37.2 C (-35.0 F)
1919
-34.4 C (-29.9 F)
1920
-32.8 C (-27.0 F)
1921
-28.9 C (-20.0 F)
1922
-32.2 C (-26.0 F)
1923
-34.4 C (-29.9 F)
1924
-37.2 C (-35.0 F)
1925
-31.7 C (-25.1 F)
1926
-31.1 C (-24.0 F)
1927
-35.0 C (-31.0 F)
1928
-28.9 C (-20.0 F)
1929
-39.4 C (-38.9 F)
1930
-18.9 C (-2.0 F)
1931
-23.9 C (-11.0 F)
1932
-35.0 C (-31.0 F)
1933
-37.2 C (-35.0 F)
1934
-28.9 C (-20.0 F)
1935
-34.4 C (-29.9 F)
1936
-41.7 C (-43.1 F)
1937
-33.3 C (-27.9 F)
1938
-31.7 C (-25.1 F)
1939
-38.9 C (-38.0 F)
1940
-33.9 C (-29.0 F)
1941
-30.6 C (-23.1 F)
1942
-35.0 C (-31.0 F)
1943
-36.1 C (-33.0 F)
1944
-28.9 C (-20.0 F)
1945
-33.9 C (-29.0 F)
1946
-31.1 C (-24.0 F)
1947
-28.9 C (-20.0 F)
1948
-30.6 C (-23.1 F)
1949
-34.4 C (-29.9 F)
1950
-35.0 C (-31.0 F)
Wettest day (Rx1day)
The wettest day of the year at Rock Springs 7 SE, 1915 to 1950. The record is 79.2 mm (3.1 in) in 1921, marked on the chart; the median year is 29.1 mm (1.1 in).
Wettest day (Rx1day) at Rock Springs 7 SE by year
Year
Wettest day (Rx1day)
1915
20.3 mm (0.8 in)
1916
31.8 mm (1.3 in)
1917
25.4 mm (1.0 in)
1918
30.5 mm (1.2 in)
1919
18.0 mm (0.7 in)
1920
35.6 mm (1.4 in)
1921
79.2 mm (3.1 in)
1922
23.4 mm (0.9 in)
1923
43.7 mm (1.7 in)
1924
31.8 mm (1.3 in)
1925
24.9 mm (1.0 in)
1926
14.0 mm (0.6 in)
1927
66.5 mm (2.6 in)
1928
47.5 mm (1.9 in)
1929
40.6 mm (1.6 in)
1930
30.2 mm (1.2 in)
1931
19.1 mm (0.8 in)
1932
49.5 mm (1.9 in)
1933
20.8 mm (0.8 in)
1934
9.4 mm (0.37 in)
1935
27.9 mm (1.1 in)
1936
19.1 mm (0.8 in)
1937
36.8 mm (1.4 in)
1938
22.6 mm (0.9 in)
1939
24.9 mm (1.0 in)
1940
32.5 mm (1.3 in)
1941
43.2 mm (1.7 in)
1942
27.4 mm (1.1 in)
1943
48.3 mm (1.9 in)
1944
63.5 mm (2.5 in)
1945
40.4 mm (1.6 in)
1946
25.7 mm (1.0 in)
1947
32.8 mm (1.3 in)
1948
25.1 mm (1.0 in)
1949
15.7 mm (0.6 in)
1950
25.1 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Rock Springs 7 SE, 1915 to 1950. The record is 169.3 mm (6.7 in) in 1921, marked on the chart; the median year is 42.1 mm (1.7 in).
Wettest five days (Rx5day) at Rock Springs 7 SE by year
Year
Wettest five days (Rx5day)
1915
38.8 mm (1.5 in)
1916
53.4 mm (2.1 in)
1917
29.7 mm (1.2 in)
1918
41.9 mm (1.6 in)
1919
41.1 mm (1.6 in)
1920
37.1 mm (1.5 in)
1921
169.3 mm (6.7 in)
1922
42.2 mm (1.7 in)
1923
70.1 mm (2.8 in)
1924
43.0 mm (1.7 in)
1925
28.7 mm (1.1 in)
1926
22.3 mm (0.9 in)
1927
76.2 mm (3.0 in)
1928
80.9 mm (3.2 in)
1929
40.6 mm (1.6 in)
1930
40.7 mm (1.6 in)
1931
23.1 mm (0.9 in)
1932
57.4 mm (2.3 in)
1933
29.9 mm (1.2 in)
1934
11.4 mm (0.4 in)
1935
51.8 mm (2.0 in)
1936
24.7 mm (1.0 in)
1937
63.2 mm (2.5 in)
1938
35.9 mm (1.4 in)
1939
37.6 mm (1.5 in)
1940
43.0 mm (1.7 in)
1941
43.7 mm (1.7 in)
1942
38.6 mm (1.5 in)
1943
68.9 mm (2.7 in)
1944
93.5 mm (3.7 in)
1945
61.8 mm (2.4 in)
1946
47.5 mm (1.9 in)
1947
52.9 mm (2.1 in)
1948
59.4 mm (2.3 in)
1949
24.6 mm (1.0 in)
1950
39.2 mm (1.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Rock Springs 7 SE, 1915 to 1950. The record is 60 days in 1934, marked on the chart; the median year is 36 days.
Longest dry spell (CDD) at Rock Springs 7 SE by year
Year
Longest dry spell (CDD)
1915
27 days
1916
27 days
1917
36 days
1918
25 days
1919
41 days
1920
45 days
1921
31 days
1922
27 days
1923
35 days
1924
22 days
1925
19 days
1926
24 days
1927
19 days
1928
41 days
1929
18 days
1930
29 days
1931
45 days
1932
27 days
1933
35 days
1934
60 days
1935
50 days
1936
34 days
1937
54 days
1938
37 days
1939
50 days
1940
60 days
1941
42 days
1942
40 days
1943
36 days
1944
38 days
1945
42 days
1946
33 days
1947
48 days
1948
41 days
1949
50 days
1950
26 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
28 years with a frost
Across 28 years with a frost, the median last spring frost at Rock Springs 7 SE falls on 22 May and the median first autumn frost on 21 September, which leaves a median of 117 days between them.
Fitted over all years, the growing season changes by +3.5 days per decade at this station.
Frost dates and growing season at Rock Springs 7 SE
Measure
Median, all years
Earliest period
Recent period (1916 to 1949)
Recent against earliest
Fitted trend
Last spring frost
22 May
n/a
22 May
n/a
-0.5 days per decade
First autumn frost
21 September
n/a
21 September
n/a
+3.0 days per decade
Growing days
117 days
n/a
117 days
n/a
+3.5 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
32 years, 1916 to 1949
A day with at least 29.4 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 91.6 mm (3.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Rock Springs 7 SE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
29.4 mm (1.2 in)
5 years
43.3 mm (1.7 in)
10 years
53.5 mm (2.1 in)
25 years
67.7 mm (2.7 in)
50 years
79.2 mm (3.1 in)
Longer than the 32 years of record
100 years
91.6 mm (3.6 in)
Longer than the 32 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, 32 years of values from 1916 to 1949.
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: 79.2 mm (3.1 in) in 1921; 66.5 mm (2.6 in) in 1927; 63.5 mm (2.5 in) in 1944.
Download the Data
Data for Rock Springs 7 SE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rock Springs 7 SE 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.