Record envelope, standing records and threshold days for Great Falls 16St (USC00243749), Montana, United States, with 135 years of record.
Key Facts for Great Falls 16St
Great Falls 16St (USC00243749) is a weather station in Montana, United States at 47.49 latitude and -111.28 longitude, 1,068 m (3,505 ft) above sea level.
The station reports from 1892 to 2026, 135 years of record.
1,464 records set at Great Falls 16St still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Great Falls 16St set a daily record high maximum temperature of 38.9 C (102.0 F) on 2 August 2026.
About the Station
Location: Montana, United States, 47.49 latitude, -111.28 longitude.
Elevation: 1,068 m (3,505 ft).
Period of record: 1892 to 2026, 135 years.
Eligible elements: tmax, tmin, prcp, snow.
Daily Record Envelope and 2026
10 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 Great Falls 16St. The lines show the 2026 daily maximum and minimum. 10 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Great Falls 16St, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.0 C (68.0 F)
-42.2 C (-44.0 F)
18.3 C (64.9 F)
-20.6 C (-5.1 F)
Feb
21.7 C (71.1 F)
-45.0 C (-49.0 F)
21.7 C (71.1 F)
-25.0 C (-13.0 F)
Mar
25.6 C (78.1 F)
-35.6 C (-32.1 F)
25.0 C (77.0 F)
-19.4 C (-2.9 F)
Apr
31.1 C (88.0 F)
-23.3 C (-9.9 F)
27.2 C (81.0 F)
-6.7 C (19.9 F)
May
37.8 C (100.0 F)
-11.1 C (12.0 F)
32.8 C (91.0 F)
-3.3 C (26.1 F)
Jun
38.9 C (102.0 F)
0.0 C (32.0 F)
30.0 C (86.0 F)
4.4 C (39.9 F)
Jul
41.7 C (107.1 F)
1.7 C (35.1 F)
38.9 C (102.0 F)
8.9 C (48.0 F)
Aug
39.4 C (102.9 F)
1.1 C (34.0 F)
38.9 C (102.0 F)
6.7 C (44.1 F)
Sep
36.1 C (97.0 F)
-12.2 C (10.0 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Nov
23.9 C (75.0 F)
-31.7 C (-25.1 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Great Falls 16St still stand. 1936 holds the most, with 66.
Standing records at Great Falls 16St by the year they were set
Year set
Standing records
1892
20
1893
25
1894
16
1895
16
1896
41
1897
25
1898
18
1899
17
1900
24
1901
13
1902
18
1903
23
1904
6
1905
27
1906
26
1907
16
1908
10
1909
24
1910
26
1911
26
1912
13
1913
11
1914
22
1915
19
1916
41
1917
22
1918
40
1919
62
1920
16
1921
25
1922
16
1923
11
1924
24
1925
23
1926
12
1927
14
1928
26
1929
12
1930
28
1931
21
1932
26
1933
23
1934
26
1935
27
1936
66
1937
3
1953
29
1954
32
1955
27
1956
26
2005
6
2006
13
2007
19
2008
22
2009
26
2010
21
2011
15
2012
15
2013
17
2014
17
2015
26
2016
25
2017
22
2018
8
2019
13
2024
9
2025
14
2026
16
All-Time Record Progression
3 new records
3 all-time records were set at Great Falls 16St between 12 December 1932 and 15 February 1936. Each dot is a new record.
When Great Falls 16St set new all-time records
Date
Kind
Detail
1932-12-12
Record daily snowfall
Record daily snowfall 35.6 cm (14.0 in)
1933-07-25
Record high maximum temperature
Record high maximum temperature 41.7 C (107.1 F)
1936-02-15
Record low minimum temperature
Record low minimum temperature -45.0 C (-49.0 F)
Wettest Day of Each Month
Jun: 85.3 mm (3.4 in)
The wettest day on record for each calendar month at Great Falls 16St. The most was 85.3 mm (3.4 in) on 23 June 1907.
Record daily precipitation for each month at Great Falls 16St
Month
Record daily precipitation (mm)
Date
Jan
14.2 mm (0.6 in)
24 January 1916
Feb
23.6 mm (0.9 in)
12 February 1897
Mar
27.7 mm (1.1 in)
13 March 1896
Apr
40.4 mm (1.6 in)
9 April 2017
May
71.9 mm (2.8 in)
25 May 1953
Jun
85.3 mm (3.4 in)
23 June 1907
Jul
45.0 mm (1.8 in)
15 July 2012
Aug
69.1 mm (2.7 in)
21 August 1933
Sep
38.4 mm (1.5 in)
19 September 1925
Oct
63.8 mm (2.5 in)
3 October 2015
Nov
29.0 mm (1.1 in)
23 November 1892
Dec
17.8 mm (0.7 in)
30 December 1917
Period of Record Coverage
1892 to 2026
Complete yearUnder 90 percent of days
68 years of record at Great Falls 16St, 1892 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1892, 1893, 1896, 1937, 1956, 2005, 2019, 2024 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 55 complete years at Great Falls 16St, 1894 to 2025. Blue stripes are years cooler than the station's own mean of 7.8 C (46.0 F); red stripes are warmer. The coolest year was 1916, at 5.1 C (41.2 F), and the warmest was 1934, at 9.8 C (49.6 F). The strongest colour marks a difference of 2.7 C (4.9 F).
Annual mean temperature at Great Falls 16St as warming stripes, 1894 to 2025
Year
Annual mean temperature
Difference from the station mean
1894
7.1 C
-0.69 C
1897
7.6 C
-0.18 C
1898
7.6 C
-0.17 C
1899
6.0 C
-1.84 C
1900
8.8 C
+0.98 C
1901
8.3 C
+0.46 C
1902
7.3 C
-0.52 C
1903
7.7 C
-0.12 C
1904
8.0 C
+0.21 C
1905
7.2 C
-0.56 C
1906
7.5 C
-0.28 C
1907
6.7 C
-1.08 C
1908
8.3 C
+0.52 C
1909
6.6 C
-1.23 C
1910
9.1 C
+1.30 C
1911
6.2 C
-1.62 C
1912
7.6 C
-0.17 C
1913
7.4 C
-0.37 C
1914
8.0 C
+0.24 C
1915
8.1 C
+0.25 C
1916
5.1 C
-2.70 C
1917
6.4 C
-1.40 C
1918
8.0 C
+0.19 C
1919
7.6 C
-0.22 C
1920
7.4 C
-0.45 C
1921
8.1 C
+0.31 C
1922
6.5 C
-1.34 C
1923
7.8 C
-0.02 C
1924
7.0 C
-0.80 C
1925
8.4 C
+0.60 C
1926
8.6 C
+0.76 C
1927
5.9 C
-1.88 C
1928
8.1 C
+0.28 C
1929
6.2 C
-1.63 C
1930
8.2 C
+0.38 C
1931
9.5 C
+1.66 C
1932
7.7 C
-0.07 C
1933
8.2 C
+0.37 C
1934
9.8 C
+1.98 C
1935
7.5 C
-0.30 C
1936
7.4 C
-0.39 C
2006
9.3 C
+1.46 C
2007
9.0 C
+1.24 C
2008
7.8 C
-0.03 C
2009
7.6 C
-0.23 C
2010
7.6 C
-0.21 C
2011
7.8 C
+0.03 C
2012
9.3 C
+1.45 C
2013
8.6 C
+0.82 C
2014
7.9 C
+0.10 C
2015
9.6 C
+1.79 C
2016
9.7 C
+1.88 C
2017
8.7 C
+0.87 C
2018
7.6 C
-0.21 C
2025
8.1 C
+0.34 C
The annual mean temperature here has risen by 0.09 C (0.04 to 0.15) per decade over 1894 to 2025. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 55 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Great Falls 16St
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.09 C (0.04 to 0.15) per decade
0.2 F (0.1 to 0.3) per decade
1894 to 2025
55
Rise
Mean daily maximum
0.11 C (0.04 to 0.18) per decade
0.2 F (0.1 to 0.3) per decade
1894 to 2025
55
Rise
Mean daily minimum
0.08 C (0.02 to 0.14) per decade
0.15 F (0.04 to 0.26) per decade
1894 to 2025
55
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
1892 to 2026
Yearly extremes at Great Falls 16St: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1933
36.7 C (98.1 F)
68
Coldest night (TNn)
-45.0 C (-49.0 F)
1936
-31.1 C (-24.0 F)
68
Wettest day (Rx1day)
85.3 mm (3.4 in)
1907
32.3 mm (1.3 in)
68
Wettest five days (Rx5day)
135.6 mm (5.3 in)
1907
52.4 mm (2.1 in)
68
Longest dry spell (CDD)
75 days
1904
35 days
68
Hottest day (TXx)
The hottest day of the year at Great Falls 16St, 1892 to 2026. The record is 41.7 C (107.1 F) in 1933, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Great Falls 16St by year
Year
Hottest day (TXx)
1892
37.8 C (100.0 F)
1893
39.4 C (102.9 F)
1894
37.2 C (99.0 F)
1895
36.1 C (97.0 F)
1896
37.8 C (100.0 F)
1897
36.7 C (98.1 F)
1898
33.9 C (93.0 F)
1899
35.6 C (96.1 F)
1900
38.9 C (102.0 F)
1901
35.0 C (95.0 F)
1902
33.3 C (91.9 F)
1903
35.6 C (96.1 F)
1904
36.1 C (97.0 F)
1905
33.9 C (93.0 F)
1906
35.6 C (96.1 F)
1907
31.1 C (88.0 F)
1908
37.8 C (100.0 F)
1909
34.4 C (93.9 F)
1910
36.7 C (98.1 F)
1911
34.4 C (93.9 F)
1912
35.6 C (96.1 F)
1913
36.1 C (97.0 F)
1914
36.7 C (98.1 F)
1915
35.6 C (96.1 F)
1916
33.9 C (93.0 F)
1917
37.8 C (100.0 F)
1918
36.7 C (98.1 F)
1919
38.9 C (102.0 F)
1920
36.1 C (97.0 F)
1921
38.9 C (102.0 F)
1922
35.0 C (95.0 F)
1923
34.4 C (93.9 F)
1924
36.7 C (98.1 F)
1925
37.8 C (100.0 F)
1926
37.8 C (100.0 F)
1927
33.9 C (93.0 F)
1928
38.3 C (100.9 F)
1929
38.9 C (102.0 F)
1930
38.3 C (100.9 F)
1931
39.4 C (102.9 F)
1932
38.3 C (100.9 F)
1933
41.7 C (107.1 F)
1934
38.9 C (102.0 F)
1935
39.4 C (102.9 F)
1936
38.9 C (102.0 F)
1937
20.0 C (68.0 F)
1953
40.6 C (105.1 F)
1954
37.2 C (99.0 F)
1955
39.4 C (102.9 F)
1956
36.7 C (98.1 F)
2005
31.7 C (89.1 F)
2006
37.2 C (99.0 F)
2007
40.0 C (104.0 F)
2008
36.7 C (98.1 F)
2009
35.0 C (95.0 F)
2010
36.1 C (97.0 F)
2011
38.3 C (100.9 F)
2012
37.8 C (100.0 F)
2013
36.7 C (98.1 F)
2014
35.0 C (95.0 F)
2015
37.8 C (100.0 F)
2016
36.1 C (97.0 F)
2017
38.9 C (102.0 F)
2018
38.3 C (100.9 F)
2019
36.7 C (98.1 F)
2024
39.4 C (102.9 F)
2025
36.1 C (97.0 F)
2026
38.9 C (102.0 F)
Coldest night (TNn)
The coldest night of the year at Great Falls 16St, 1892 to 2026. The record is -45.0 C (-49.0 F) in 1936, marked on the chart; the median year is -31.1 C (-24.0 F).
Coldest night (TNn) at Great Falls 16St by year
Year
Coldest night (TNn)
1892
-32.8 C (-27.0 F)
1893
-41.1 C (-42.0 F)
1894
-33.3 C (-27.9 F)
1895
-32.8 C (-27.0 F)
1896
-32.8 C (-27.0 F)
1897
-30.6 C (-23.1 F)
1898
-26.1 C (-15.0 F)
1899
-37.2 C (-35.0 F)
1900
-31.1 C (-24.0 F)
1901
-30.0 C (-22.0 F)
1902
-30.6 C (-23.1 F)
1903
-31.7 C (-25.1 F)
1904
-28.9 C (-20.0 F)
1905
-34.4 C (-29.9 F)
1906
-31.1 C (-24.0 F)
1907
-32.2 C (-26.0 F)
1908
-21.7 C (-7.1 F)
1909
-42.2 C (-44.0 F)
1910
-36.7 C (-34.1 F)
1911
-36.1 C (-33.0 F)
1912
-31.7 C (-25.1 F)
1913
-30.0 C (-22.0 F)
1914
-29.4 C (-20.9 F)
1915
-29.4 C (-20.9 F)
1916
-41.1 C (-42.0 F)
1917
-34.4 C (-29.9 F)
1918
-37.8 C (-36.0 F)
1919
-38.9 C (-38.0 F)
1920
-30.6 C (-23.1 F)
1921
-30.6 C (-23.1 F)
1922
-35.6 C (-32.1 F)
1923
-36.1 C (-33.0 F)
1924
-35.6 C (-32.1 F)
1925
-25.6 C (-14.1 F)
1926
-28.3 C (-18.9 F)
1927
-36.1 C (-33.0 F)
1928
-32.8 C (-27.0 F)
1929
-38.3 C (-36.9 F)
1930
-34.4 C (-29.9 F)
1931
-23.9 C (-11.0 F)
1932
-35.6 C (-32.1 F)
1933
-32.8 C (-27.0 F)
1934
-26.7 C (-16.1 F)
1935
-33.3 C (-27.9 F)
1936
-45.0 C (-49.0 F)
1937
-33.9 C (-29.0 F)
1953
-21.7 C (-7.1 F)
1954
-38.3 C (-36.9 F)
1955
-28.9 C (-20.0 F)
1956
-30.6 C (-23.1 F)
2005
-23.3 C (-9.9 F)
2006
-29.4 C (-20.9 F)
2007
-21.7 C (-7.1 F)
2008
-29.4 C (-20.9 F)
2009
-31.1 C (-24.0 F)
2010
-30.6 C (-23.1 F)
2011
-29.4 C (-20.9 F)
2012
-27.8 C (-18.0 F)
2013
-30.6 C (-23.1 F)
2014
-33.3 C (-27.9 F)
2015
-26.7 C (-16.1 F)
2016
-29.4 C (-20.9 F)
2017
-28.3 C (-18.9 F)
2018
-31.1 C (-24.0 F)
2019
-33.3 C (-27.9 F)
2024
-15.6 C (3.9 F)
2025
-34.4 C (-29.9 F)
2026
-25.0 C (-13.0 F)
Wettest day (Rx1day)
The wettest day of the year at Great Falls 16St, 1892 to 2026. The record is 85.3 mm (3.4 in) in 1907, marked on the chart; the median year is 32.3 mm (1.3 in).
Wettest day (Rx1day) at Great Falls 16St by year
Year
Wettest day (Rx1day)
1892
60.2 mm (2.4 in)
1893
21.6 mm (0.9 in)
1894
43.4 mm (1.7 in)
1895
23.1 mm (0.9 in)
1896
27.7 mm (1.1 in)
1897
33.5 mm (1.3 in)
1898
35.1 mm (1.4 in)
1899
20.6 mm (0.8 in)
1900
35.6 mm (1.4 in)
1901
26.2 mm (1.0 in)
1902
69.9 mm (2.8 in)
1903
51.3 mm (2.0 in)
1904
15.7 mm (0.6 in)
1905
19.3 mm (0.8 in)
1906
34.3 mm (1.4 in)
1907
85.3 mm (3.4 in)
1908
68.6 mm (2.7 in)
1909
32.3 mm (1.3 in)
1910
46.7 mm (1.8 in)
1911
18.5 mm (0.7 in)
1912
30.7 mm (1.2 in)
1913
19.8 mm (0.8 in)
1914
54.9 mm (2.2 in)
1915
50.3 mm (2.0 in)
1916
31.8 mm (1.3 in)
1917
38.1 mm (1.5 in)
1918
30.0 mm (1.2 in)
1919
21.3 mm (0.8 in)
1920
19.8 mm (0.8 in)
1921
25.9 mm (1.0 in)
1922
26.7 mm (1.1 in)
1923
49.3 mm (1.9 in)
1924
23.9 mm (0.9 in)
1925
38.4 mm (1.5 in)
1926
33.8 mm (1.3 in)
1927
40.1 mm (1.6 in)
1928
21.3 mm (0.8 in)
1929
16.5 mm (0.6 in)
1930
21.6 mm (0.9 in)
1931
22.9 mm (0.9 in)
1932
44.5 mm (1.8 in)
1933
69.1 mm (2.7 in)
1934
24.6 mm (1.0 in)
1935
8.4 mm (0.33 in)
1936
14.5 mm (0.6 in)
1937
5.6 mm (0.22 in)
1953
71.9 mm (2.8 in)
1954
50.8 mm (2.0 in)
1955
34.8 mm (1.4 in)
1956
14.0 mm (0.6 in)
2005
32.3 mm (1.3 in)
2006
48.0 mm (1.9 in)
2007
24.9 mm (1.0 in)
2008
29.5 mm (1.2 in)
2009
32.3 mm (1.3 in)
2010
26.7 mm (1.1 in)
2011
29.0 mm (1.1 in)
2012
45.0 mm (1.8 in)
2013
22.1 mm (0.9 in)
2014
65.0 mm (2.6 in)
2015
63.8 mm (2.5 in)
2016
57.4 mm (2.3 in)
2017
40.4 mm (1.6 in)
2018
32.5 mm (1.3 in)
2019
39.6 mm (1.6 in)
2024
17.0 mm (0.7 in)
2025
41.1 mm (1.6 in)
2026
54.6 mm (2.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Great Falls 16St, 1892 to 2026. The record is 135.6 mm (5.3 in) in 1907, marked on the chart; the median year is 52.4 mm (2.1 in).
Wettest five days (Rx5day) at Great Falls 16St by year
Year
Wettest five days (Rx5day)
1892
111.3 mm (4.4 in)
1893
47.3 mm (1.9 in)
1894
65.7 mm (2.6 in)
1895
35.5 mm (1.4 in)
1896
49.1 mm (1.9 in)
1897
65.0 mm (2.6 in)
1898
52.1 mm (2.1 in)
1899
29.7 mm (1.2 in)
1900
48.0 mm (1.9 in)
1901
44.9 mm (1.8 in)
1902
83.0 mm (3.3 in)
1903
52.6 mm (2.1 in)
1904
17.0 mm (0.7 in)
1905
43.9 mm (1.7 in)
1906
62.4 mm (2.5 in)
1907
135.6 mm (5.3 in)
1908
99.9 mm (3.9 in)
1909
75.3 mm (3.0 in)
1910
61.4 mm (2.4 in)
1911
43.7 mm (1.7 in)
1912
45.9 mm (1.8 in)
1913
41.6 mm (1.6 in)
1914
71.4 mm (2.8 in)
1915
82.0 mm (3.2 in)
1916
73.7 mm (2.9 in)
1917
80.1 mm (3.2 in)
1918
40.9 mm (1.6 in)
1919
35.1 mm (1.4 in)
1920
27.9 mm (1.1 in)
1921
60.7 mm (2.4 in)
1922
53.1 mm (2.1 in)
1923
111.0 mm (4.4 in)
1924
53.3 mm (2.1 in)
1925
42.5 mm (1.7 in)
1926
41.7 mm (1.6 in)
1927
82.3 mm (3.2 in)
1928
51.2 mm (2.0 in)
1929
34.5 mm (1.4 in)
1930
25.9 mm (1.0 in)
1931
32.4 mm (1.3 in)
1932
84.8 mm (3.3 in)
1933
122.2 mm (4.8 in)
1934
38.5 mm (1.5 in)
1935
13.5 mm (0.5 in)
1936
25.7 mm (1.0 in)
1937
8.7 mm (0.34 in)
1953
122.4 mm (4.8 in)
1954
66.1 mm (2.6 in)
1955
51.8 mm (2.0 in)
1956
18.6 mm (0.7 in)
2005
33.1 mm (1.3 in)
2006
82.1 mm (3.2 in)
2007
41.7 mm (1.6 in)
2008
79.8 mm (3.1 in)
2009
54.2 mm (2.1 in)
2010
55.2 mm (2.2 in)
2011
52.3 mm (2.1 in)
2012
47.1 mm (1.9 in)
2013
59.4 mm (2.3 in)
2014
102.4 mm (4.0 in)
2015
74.0 mm (2.9 in)
2016
76.7 mm (3.0 in)
2017
52.4 mm (2.1 in)
2018
55.9 mm (2.2 in)
2019
48.3 mm (1.9 in)
2024
27.7 mm (1.1 in)
2025
51.8 mm (2.0 in)
2026
83.3 mm (3.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Great Falls 16St, 1892 to 2026. The record is 75 days in 1904, marked on the chart; the median year is 35 days.
Longest dry spell (CDD) at Great Falls 16St by year
Year
Longest dry spell (CDD)
1892
39 days
1893
40 days
1894
43 days
1895
42 days
1896
35 days
1897
48 days
1898
25 days
1899
39 days
1900
38 days
1901
72 days
1902
39 days
1903
35 days
1904
75 days
1905
29 days
1906
29 days
1907
62 days
1908
39 days
1909
24 days
1910
39 days
1911
17 days
1912
27 days
1913
28 days
1914
31 days
1915
54 days
1916
27 days
1917
33 days
1918
38 days
1919
46 days
1920
39 days
1921
45 days
1922
37 days
1923
37 days
1924
19 days
1925
30 days
1926
33 days
1927
22 days
1928
40 days
1929
27 days
1930
29 days
1931
39 days
1932
33 days
1933
26 days
1934
41 days
1935
32 days
1936
31 days
1937
24 days
1953
75 days
1954
69 days
1955
45 days
1956
21 days
2005
25 days
2006
38 days
2007
32 days
2008
28 days
2009
45 days
2010
51 days
2011
18 days
2012
48 days
2013
22 days
2014
21 days
2015
47 days
2016
49 days
2017
59 days
2018
28 days
2019
27 days
2024
35 days
2025
18 days
2026
28 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
55 years with a frost
Across 55 years with a frost, the median last spring frost at Great Falls 16St falls on 11 May and the median first autumn frost on 24 September, which leaves a median of 139 days between them.
Fitted over all years, the growing season changes by 0.0 days per decade at this station.
Frost dates and growing season at Great Falls 16St
Measure
Median, all years
Earliest period
Recent period (1921 to 2025)
Recent against earliest
Fitted trend
Last spring frost
11 May
n/a
13 May
n/a
+0.4 days per decade
First autumn frost
24 September
n/a
22 September
n/a
+0.4 days per decade
Growing days
139 days
n/a
130 days
n/a
0.0 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
59 years, 1893 to 2025
A day with at least 32.4 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 96.4 mm (3.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Great Falls 16St: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
32.4 mm (1.3 in)
5 years
47.4 mm (1.9 in)
10 years
58.2 mm (2.3 in)
25 years
72.7 mm (2.9 in)
50 years
84.3 mm (3.3 in)
100 years
96.4 mm (3.8 in)
Longer than the 59 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, 59 years of values from 1893 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: 85.3 mm (3.4 in) in 1907; 71.9 mm (2.8 in) in 1953; 69.9 mm (2.8 in) in 1902.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Great Falls 16St standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Great Falls 16St 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.