Record envelope, standing records and threshold days for Circle 7 N (USC00241765), Montana, United States, with 35 years of record.
Key Facts for Circle 7 N
Circle 7 N (USC00241765) is a weather station in Montana, United States at 47.52 latitude and -105.57 longitude, 741 m (2,431 ft) above sea level.
The station reports from 1929 to 1963, 35 years of record.
1,464 records set at Circle 7 N still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Circle 7 N set a daily record high minimum temperature of 20.0 C (68.0 F) on 11 August 1963.
About the Station
Location: Montana, United States, 47.52 latitude, -105.57 longitude.
Elevation: 741 m (2,431 ft).
Period of record: 1929 to 1963, 35 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 Circle 7 N. 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 Circle 7 N, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.6 C (60.1 F)
-43.9 C (-47.0 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-49.4 C (-56.9 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-20.6 C (-5.1 F)
n/a
n/a
May
38.3 C (100.9 F)
-13.3 C (8.1 F)
n/a
n/a
Jun
41.7 C (107.1 F)
-3.9 C (25.0 F)
n/a
n/a
Jul
43.3 C (109.9 F)
-2.2 C (28.0 F)
n/a
n/a
Aug
42.2 C (108.0 F)
-5.0 C (23.0 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-12.2 C (10.0 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-22.8 C (-9.0 F)
n/a
n/a
Nov
22.2 C (72.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Dec
21.7 C (71.1 F)
-37.8 C (-36.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Circle 7 N still stand. 1936 holds the most, with 104.
Standing records at Circle 7 N by the year they were set
Year set
Standing records
1929
57
1930
49
1931
72
1932
43
1933
39
1934
63
1935
34
1936
104
1937
46
1938
29
1939
53
1940
38
1941
30
1942
56
1943
42
1944
29
1945
38
1946
30
1947
32
1948
36
1949
43
1950
59
1951
43
1952
49
1953
37
1954
48
1955
26
1956
30
1957
21
1958
37
1959
33
1960
31
1961
38
1962
30
1963
19
Wettest Day of Each Month
Jun: 110.7 mm (4.4 in)
The wettest day on record for each calendar month at Circle 7 N. The most was 110.7 mm (4.4 in) on 12 June 1937.
Record daily precipitation for each month at Circle 7 N
Month
Record daily precipitation (mm)
Date
Jan
12.7 mm (0.5 in)
2 January 1930
Feb
10.9 mm (0.4 in)
5 February 1952
Mar
19.8 mm (0.8 in)
24 March 1937
Apr
76.5 mm (3.0 in)
9 April 1939
May
60.7 mm (2.4 in)
20 May 1939
Jun
110.7 mm (4.4 in)
12 June 1937
Jul
56.6 mm (2.2 in)
14 July 1948
Aug
36.1 mm (1.4 in)
5 August 1954
Sep
36.6 mm (1.4 in)
7 September 1941
Oct
50.0 mm (2.0 in)
22 October 1953
Nov
16.8 mm (0.7 in)
6 November 1945
Dec
25.4 mm (1.0 in)
16 December 1929
Period of Record Coverage
1929 to 1963
Complete yearUnder 90 percent of days
35 years of record at Circle 7 N, 1929 to 1963. 1 years have data for under 90 percent of days and are left out of rankings: 1963.
Cooler than the station meanWarmer than the station mean
One stripe for each of 32 complete years at Circle 7 N, 1929 to 1962. Blue stripes are years cooler than the station's own mean of 5.7 C (42.3 F); red stripes are warmer. The coolest year was 1951, at 2.9 C (37.2 F), and the warmest was 1931, at 7.6 C (45.7 F). The strongest colour marks a difference of 2.9 C (5.2 F).
Annual mean temperature at Circle 7 N as warming stripes, 1929 to 1962
Year
Annual mean temperature
Difference from the station mean
1929
5.1 C
-0.56 C
1930
6.1 C
+0.37 C
1931
7.6 C
+1.93 C
1932
5.1 C
-0.61 C
1934
7.3 C
+1.60 C
1936
4.9 C
-0.79 C
1937
4.9 C
-0.85 C
1938
6.4 C
+0.70 C
1939
6.4 C
+0.67 C
1940
5.6 C
-0.06 C
1941
7.0 C
+1.26 C
1942
6.0 C
+0.33 C
1943
5.5 C
-0.22 C
1944
6.1 C
+0.35 C
1945
5.4 C
-0.26 C
1946
6.6 C
+0.92 C
1947
5.6 C
-0.12 C
1948
5.9 C
+0.18 C
1949
4.9 C
-0.80 C
1950
3.0 C
-2.74 C
1951
2.9 C
-2.83 C
1952
5.1 C
-0.59 C
1953
7.1 C
+1.43 C
1954
6.2 C
+0.53 C
1955
4.8 C
-0.92 C
1956
5.7 C
+0.00 C
1957
5.7 C
-0.03 C
1958
6.3 C
+0.64 C
1959
5.2 C
-0.50 C
1960
5.4 C
-0.28 C
1961
6.8 C
+1.05 C
1962
5.8 C
+0.11 C
The fitted trend in annual mean temperature here over 1929 to 1962 is -0.2 C (-0.6 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.3 F (-1.0 to 0.4) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Circle 7 N
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.2 C (-0.6 to 0.2) per decade
-0.3 F (-1.0 to 0.4) per decade
1929 to 1962
32
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.5 to 0.3) per decade
-0.2 F (-0.9 to 0.6) per decade
1929 to 1962
32
Not clearly different from zero
Mean daily minimum
-0.2 C (-0.6 to 0.2) per decade
-0.4 F (-1.2 to 0.3) per decade
1929 to 1962
32
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
1929 to 1963
Yearly extremes at Circle 7 N: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.3 C (109.9 F)
1929
38.9 C (102.0 F)
35
Coldest night (TNn)
-49.4 C (-56.9 F)
1936
-36.1 C (-33.0 F)
35
Wettest day (Rx1day)
110.7 mm (4.4 in)
1937
35.1 mm (1.4 in)
35
Wettest five days (Rx5day)
126.4 mm (5.0 in)
1963
41.7 mm (1.6 in)
35
Longest dry spell (CDD)
74 days
1934
38 days
35
Hottest day (TXx)
The hottest day of the year at Circle 7 N, 1929 to 1963. The record is 43.3 C (109.9 F) in 1929, marked on the chart; the median year is 38.9 C (102.0 F).
Hottest day (TXx) at Circle 7 N by year
Year
Hottest day (TXx)
1929
43.3 C (109.9 F)
1930
38.9 C (102.0 F)
1931
41.7 C (107.1 F)
1932
38.3 C (100.9 F)
1933
41.1 C (106.0 F)
1934
39.4 C (102.9 F)
1935
42.2 C (108.0 F)
1936
42.2 C (108.0 F)
1937
41.1 C (106.0 F)
1938
36.1 C (97.0 F)
1939
38.3 C (100.9 F)
1940
38.9 C (102.0 F)
1941
40.6 C (105.1 F)
1942
37.8 C (100.0 F)
1943
37.8 C (100.0 F)
1944
36.1 C (97.0 F)
1945
38.3 C (100.9 F)
1946
37.8 C (100.0 F)
1947
40.0 C (104.0 F)
1948
39.4 C (102.9 F)
1949
42.2 C (108.0 F)
1950
38.3 C (100.9 F)
1951
38.9 C (102.0 F)
1952
38.3 C (100.9 F)
1953
35.0 C (95.0 F)
1954
37.8 C (100.0 F)
1955
38.3 C (100.9 F)
1956
38.9 C (102.0 F)
1957
38.3 C (100.9 F)
1958
40.6 C (105.1 F)
1959
39.4 C (102.9 F)
1960
41.7 C (107.1 F)
1961
40.0 C (104.0 F)
1962
36.7 C (98.1 F)
1963
38.9 C (102.0 F)
Coldest night (TNn)
The coldest night of the year at Circle 7 N, 1929 to 1963. The record is -49.4 C (-56.9 F) in 1936, marked on the chart; the median year is -36.1 C (-33.0 F).
Coldest night (TNn) at Circle 7 N by year
Year
Coldest night (TNn)
1929
-39.4 C (-38.9 F)
1930
-38.3 C (-36.9 F)
1931
-28.9 C (-20.0 F)
1932
-33.9 C (-29.0 F)
1933
-37.2 C (-35.0 F)
1934
-32.8 C (-27.0 F)
1935
-35.0 C (-31.0 F)
1936
-49.4 C (-56.9 F)
1937
-40.6 C (-41.1 F)
1938
-37.2 C (-35.0 F)
1939
-40.6 C (-41.1 F)
1940
-35.6 C (-32.1 F)
1941
-28.3 C (-18.9 F)
1942
-36.1 C (-33.0 F)
1943
-40.0 C (-40.0 F)
1944
-31.7 C (-25.1 F)
1945
-36.1 C (-33.0 F)
1946
-31.7 C (-25.1 F)
1947
-35.6 C (-32.1 F)
1948
-35.0 C (-31.0 F)
1949
-40.0 C (-40.0 F)
1950
-43.9 C (-47.0 F)
1951
-36.7 C (-34.1 F)
1952
-36.7 C (-34.1 F)
1953
-32.8 C (-27.0 F)
1954
-42.8 C (-45.0 F)
1955
-33.9 C (-29.0 F)
1956
-36.1 C (-33.0 F)
1957
-41.1 C (-42.0 F)
1958
-36.1 C (-33.0 F)
1959
-37.8 C (-36.0 F)
1960
-36.1 C (-33.0 F)
1961
-31.7 C (-25.1 F)
1962
-44.4 C (-47.9 F)
1963
-38.9 C (-38.0 F)
Wettest day (Rx1day)
The wettest day of the year at Circle 7 N, 1929 to 1963. The record is 110.7 mm (4.4 in) in 1937, marked on the chart; the median year is 35.1 mm (1.4 in).
Wettest day (Rx1day) at Circle 7 N by year
Year
Wettest day (Rx1day)
1929
38.9 mm (1.5 in)
1930
36.8 mm (1.4 in)
1931
26.7 mm (1.1 in)
1932
29.2 mm (1.1 in)
1933
33.0 mm (1.3 in)
1934
31.5 mm (1.2 in)
1935
21.6 mm (0.9 in)
1936
10.4 mm (0.4 in)
1937
110.7 mm (4.4 in)
1938
56.4 mm (2.2 in)
1939
76.5 mm (3.0 in)
1940
44.7 mm (1.8 in)
1941
36.6 mm (1.4 in)
1942
19.1 mm (0.8 in)
1943
43.7 mm (1.7 in)
1944
40.6 mm (1.6 in)
1945
31.0 mm (1.2 in)
1946
47.0 mm (1.9 in)
1947
27.9 mm (1.1 in)
1948
56.6 mm (2.2 in)
1949
21.3 mm (0.8 in)
1950
50.8 mm (2.0 in)
1951
17.8 mm (0.7 in)
1952
12.4 mm (0.5 in)
1953
50.0 mm (2.0 in)
1954
36.1 mm (1.4 in)
1955
35.1 mm (1.4 in)
1956
34.5 mm (1.4 in)
1957
55.1 mm (2.2 in)
1958
25.4 mm (1.0 in)
1959
21.1 mm (0.8 in)
1960
23.9 mm (0.9 in)
1961
24.4 mm (1.0 in)
1962
40.6 mm (1.6 in)
1963
58.4 mm (2.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Circle 7 N, 1929 to 1963. The record is 126.4 mm (5.0 in) in 1963, marked on the chart; the median year is 41.7 mm (1.6 in).
Wettest five days (Rx5day) at Circle 7 N by year
Year
Wettest five days (Rx5day)
1929
62.7 mm (2.5 in)
1930
51.6 mm (2.0 in)
1931
41.3 mm (1.6 in)
1932
56.7 mm (2.2 in)
1933
40.9 mm (1.6 in)
1934
50.4 mm (2.0 in)
1935
31.3 mm (1.2 in)
1936
20.6 mm (0.8 in)
1937
118.3 mm (4.7 in)
1938
96.8 mm (3.8 in)
1939
83.1 mm (3.3 in)
1940
73.3 mm (2.9 in)
1941
39.9 mm (1.6 in)
1942
39.7 mm (1.6 in)
1943
78.2 mm (3.1 in)
1944
70.4 mm (2.8 in)
1945
31.3 mm (1.2 in)
1946
92.0 mm (3.6 in)
1947
34.2 mm (1.3 in)
1948
85.1 mm (3.4 in)
1949
31.3 mm (1.2 in)
1950
69.6 mm (2.7 in)
1951
33.2 mm (1.3 in)
1952
21.0 mm (0.8 in)
1953
62.2 mm (2.4 in)
1954
40.2 mm (1.6 in)
1955
36.5 mm (1.4 in)
1956
41.7 mm (1.6 in)
1957
76.7 mm (3.0 in)
1958
31.7 mm (1.2 in)
1959
34.3 mm (1.4 in)
1960
39.4 mm (1.6 in)
1961
37.9 mm (1.5 in)
1962
53.9 mm (2.1 in)
1963
126.4 mm (5.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Circle 7 N, 1929 to 1963. The record is 74 days in 1934, marked on the chart; the median year is 38 days.
Longest dry spell (CDD) at Circle 7 N by year
Year
Longest dry spell (CDD)
1929
25 days
1930
26 days
1931
34 days
1932
44 days
1933
37 days
1934
74 days
1935
57 days
1936
34 days
1937
41 days
1938
37 days
1939
69 days
1940
57 days
1941
37 days
1942
51 days
1943
43 days
1944
42 days
1945
42 days
1946
48 days
1947
30 days
1948
30 days
1949
42 days
1950
27 days
1951
39 days
1952
57 days
1953
28 days
1954
34 days
1955
73 days
1956
35 days
1957
33 days
1958
38 days
1959
32 days
1960
49 days
1961
64 days
1962
30 days
1963
24 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
32 years with a frost
Across 32 years with a frost, the median last spring frost at Circle 7 N falls on 28 May and the median first autumn frost on 10 September, which leaves a median of 99 days between them.
Fitted over all years, the growing season changes by +0.1 days per decade at this station.
Frost dates and growing season at Circle 7 N
Measure
Median, all years
Earliest period
Recent period (1931 to 1962)
Recent against earliest
Fitted trend
Last spring frost
28 May
n/a
29 May
n/a
-0.9 days per decade
First autumn frost
10 September
n/a
10 September
n/a
-0.8 days per decade
Growing days
99 days
n/a
99 days
n/a
+0.1 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
34 years, 1929 to 1962
A day with at least 33.2 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 104.1 mm (4.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Circle 7 N: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
33.2 mm (1.3 in)
5 years
49.2 mm (1.9 in)
10 years
61.0 mm (2.4 in)
25 years
77.1 mm (3.0 in)
50 years
90.2 mm (3.6 in)
Longer than the 34 years of record
100 years
104.1 mm (4.1 in)
Longer than the 34 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, 34 years of values from 1929 to 1962.
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: 110.7 mm (4.4 in) in 1937; 76.5 mm (3.0 in) in 1939; 56.6 mm (2.2 in) in 1948.
Download the Data
Data for Circle 7 N standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Circle 7 N 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.