Record envelope, standing records and threshold days for Twin Falls 2 NNE (USC00109294), Idaho, United States, with 70 years of record.
Key Facts for Twin Falls 2 NNE
Twin Falls 2 NNE (USC00109294) is a weather station in Idaho, United States at 42.58 latitude and -114.47 longitude, 1,125 m (3,691 ft) above sea level.
The station reports from 1905 to 1974, 70 years of record.
1,464 records set at Twin Falls 2 NNE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Twin Falls 2 NNE set a daily record high minimum temperature of 11.7 C (53.1 F) on 8 May 1974.
About the Station
Location: Idaho, United States, 42.58 latitude, -114.47 longitude.
Elevation: 1,125 m (3,691 ft).
Period of record: 1905 to 1974, 70 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 Twin Falls 2 NNE. 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 Twin Falls 2 NNE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.8 C (64.0 F)
-34.4 C (-29.9 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-19.4 C (-2.9 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-12.8 C (9.0 F)
n/a
n/a
May
37.2 C (99.0 F)
-5.0 C (23.0 F)
n/a
n/a
Jun
40.0 C (104.0 F)
-2.8 C (27.0 F)
n/a
n/a
Jul
41.7 C (107.1 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
40.0 C (104.0 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-10.0 C (14.0 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-12.2 C (10.0 F)
n/a
n/a
Nov
24.4 C (75.9 F)
-22.2 C (-8.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Twin Falls 2 NNE still stand. 1906 holds the most, with 41.
Standing records at Twin Falls 2 NNE by the year they were set
Year set
Standing records
1905
16
1906
41
1907
33
1908
35
1909
19
1910
26
1911
28
1912
13
1913
33
1914
18
1915
18
1916
27
1917
26
1918
30
1919
23
1920
20
1921
29
1922
25
1923
12
1924
30
1925
9
1926
22
1927
25
1928
14
1929
15
1930
19
1931
25
1932
27
1933
27
1934
36
1935
17
1936
31
1937
25
1938
17
1939
28
1940
29
1941
4
1942
19
1943
16
1944
12
1945
14
1946
13
1947
11
1948
22
1949
27
1950
27
1951
8
1952
13
1953
25
1954
21
1955
22
1956
11
1957
9
1958
39
1959
18
1960
15
1961
19
1962
25
1963
18
1964
17
1965
25
1966
19
1967
12
1968
19
1969
18
1970
16
1971
15
1972
26
1973
12
1974
9
All-Time Record Progression
3 new records
3 all-time records were set at Twin Falls 2 NNE between 15 January 1936 and 11 July 1973. Each dot is a new record.
When Twin Falls 2 NNE set new all-time records
Date
Kind
Detail
1936-01-15
Record daily precipitation
Record daily precipitation 36.3 mm (1.4 in)
1939-07-09
Record high maximum temperature
Record high maximum temperature 41.1 C (106.0 F)
1973-07-11
Record high maximum temperature
Record high maximum temperature 41.7 C (107.1 F)
Wettest Day of Each Month
Jan: 36.3 mm (1.4 in)
The wettest day on record for each calendar month at Twin Falls 2 NNE. The most was 36.3 mm (1.4 in) on 15 January 1936.
Record daily precipitation for each month at Twin Falls 2 NNE
Month
Record daily precipitation (mm)
Date
Jan
36.3 mm (1.4 in)
15 January 1936
Feb
19.1 mm (0.8 in)
24 February 1972
Mar
32.3 mm (1.3 in)
22 March 1973
Apr
26.7 mm (1.1 in)
27 April 1963
May
36.1 mm (1.4 in)
1 May 1959
Jun
25.4 mm (1.0 in)
5 June 1906
Jul
26.2 mm (1.0 in)
21 July 1925
Aug
22.1 mm (0.9 in)
20 August 1968
Sep
30.5 mm (1.2 in)
26 September 1923
Oct
24.9 mm (1.0 in)
11 October 1956
Nov
30.2 mm (1.2 in)
20 November 1909
Dec
31.2 mm (1.2 in)
26 December 1907
Period of Record Coverage
1905 to 1974
Complete yearUnder 90 percent of days
70 years of record at Twin Falls 2 NNE, 1905 to 1974. 3 years have data for under 90 percent of days and are left out of rankings: 1905, 1917, 1974.
Cooler than the station meanWarmer than the station mean
One stripe for each of 64 complete years at Twin Falls 2 NNE, 1906 to 1973. Blue stripes are years cooler than the station's own mean of 9.4 C (49.0 F); red stripes are warmer. The coolest year was 1911, at 7.7 C (45.8 F), and the warmest was 1934, at 11.8 C (53.2 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Twin Falls 2 NNE as warming stripes, 1906 to 1973
Year
Annual mean temperature
Difference from the station mean
1906
9.2 C
-0.29 C
1907
9.2 C
-0.21 C
1908
8.6 C
-0.86 C
1909
8.8 C
-0.65 C
1910
9.7 C
+0.20 C
1911
7.7 C
-1.77 C
1913
8.6 C
-0.88 C
1914
9.5 C
+0.00 C
1916
8.2 C
-1.24 C
1918
9.4 C
-0.07 C
1919
8.5 C
-0.94 C
1920
8.5 C
-0.95 C
1921
9.3 C
-0.17 C
1922
7.7 C
-1.74 C
1923
8.5 C
-1.00 C
1924
8.6 C
-0.88 C
1925
9.6 C
+0.16 C
1926
9.9 C
+0.44 C
1927
8.9 C
-0.51 C
1928
8.9 C
-0.56 C
1930
8.9 C
-0.56 C
1931
10.0 C
+0.50 C
1932
8.3 C
-1.17 C
1933
9.2 C
-0.27 C
1934
11.8 C
+2.33 C
1935
8.9 C
-0.54 C
1936
9.5 C
+0.02 C
1937
9.4 C
-0.10 C
1938
10.0 C
+0.51 C
1939
10.4 C
+0.91 C
1940
10.9 C
+1.44 C
1941
9.8 C
+0.31 C
1942
9.0 C
-0.42 C
1943
10.0 C
+0.51 C
1944
8.8 C
-0.62 C
1945
9.6 C
+0.19 C
1946
9.9 C
+0.48 C
1947
10.2 C
+0.73 C
1948
9.3 C
-0.11 C
1949
9.3 C
-0.19 C
1950
10.0 C
+0.53 C
1951
9.4 C
-0.05 C
1952
9.5 C
+0.05 C
1953
10.7 C
+1.24 C
1954
10.5 C
+1.01 C
1955
9.0 C
-0.49 C
1956
9.7 C
+0.26 C
1957
9.8 C
+0.32 C
1958
11.1 C
+1.68 C
1959
10.1 C
+0.65 C
1960
10.1 C
+0.60 C
1961
10.6 C
+1.11 C
1962
9.5 C
+0.09 C
1963
10.0 C
+0.57 C
1964
8.6 C
-0.89 C
1965
9.4 C
-0.09 C
1966
10.2 C
+0.78 C
1967
10.1 C
+0.64 C
1968
9.3 C
-0.14 C
1969
9.8 C
+0.38 C
1970
9.5 C
+0.01 C
1971
9.1 C
-0.38 C
1972
9.2 C
-0.21 C
1973
9.7 C
+0.24 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1906 to 1973. In Fahrenheit: 0.3 F (0.2 to 0.5) per decade. The slope is a straight line fitted to 64 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Twin Falls 2 NNE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.3) per decade
0.3 F (0.2 to 0.5) per decade
1906 to 1973
64
Rise
Mean daily maximum
0.05 C (-0.07 to 0.16) per decade
0.1 F (-0.1 to 0.3) per decade
1906 to 1973
64
Not clearly different from zero
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.5 F (0.4 to 0.7) per decade
1906 to 1973
64
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
1905 to 1974
Yearly extremes at Twin Falls 2 NNE: 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)
1973
38.3 C (100.9 F)
70
Coldest night (TNn)
-34.4 C (-29.9 F)
1922
-20.6 C (-5.1 F)
70
Wettest day (Rx1day)
36.3 mm (1.4 in)
1936
18.9 mm (0.7 in)
70
Wettest five days (Rx5day)
66.0 mm (2.6 in)
1909
32.4 mm (1.3 in)
70
Longest dry spell (CDD)
121 days
1934
49 days
70
Hottest day (TXx)
The hottest day of the year at Twin Falls 2 NNE, 1905 to 1974. The record is 41.7 C (107.1 F) in 1973, marked on the chart; the median year is 38.3 C (100.9 F).
Hottest day (TXx) at Twin Falls 2 NNE by year
Year
Hottest day (TXx)
1905
35.6 C (96.1 F)
1906
38.3 C (100.9 F)
1907
36.1 C (97.0 F)
1908
37.8 C (100.0 F)
1909
36.1 C (97.0 F)
1910
39.4 C (102.9 F)
1911
36.7 C (98.1 F)
1912
36.7 C (98.1 F)
1913
37.2 C (99.0 F)
1914
37.8 C (100.0 F)
1915
38.9 C (102.0 F)
1916
38.9 C (102.0 F)
1917
37.2 C (99.0 F)
1918
37.2 C (99.0 F)
1919
38.3 C (100.9 F)
1920
37.8 C (100.0 F)
1921
36.7 C (98.1 F)
1922
38.3 C (100.9 F)
1923
36.7 C (98.1 F)
1924
39.4 C (102.9 F)
1925
39.4 C (102.9 F)
1926
40.0 C (104.0 F)
1927
37.8 C (100.0 F)
1928
38.3 C (100.9 F)
1929
37.8 C (100.0 F)
1930
38.3 C (100.9 F)
1931
40.6 C (105.1 F)
1932
37.8 C (100.0 F)
1933
40.0 C (104.0 F)
1934
40.6 C (105.1 F)
1935
40.6 C (105.1 F)
1936
40.0 C (104.0 F)
1937
38.9 C (102.0 F)
1938
35.6 C (96.1 F)
1939
41.1 C (106.0 F)
1940
40.6 C (105.1 F)
1941
37.8 C (100.0 F)
1942
39.4 C (102.9 F)
1943
37.2 C (99.0 F)
1944
37.2 C (99.0 F)
1945
37.2 C (99.0 F)
1946
38.9 C (102.0 F)
1947
38.9 C (102.0 F)
1948
37.8 C (100.0 F)
1949
40.0 C (104.0 F)
1950
38.9 C (102.0 F)
1951
38.9 C (102.0 F)
1952
37.2 C (99.0 F)
1953
38.3 C (100.9 F)
1954
37.8 C (100.0 F)
1955
39.4 C (102.9 F)
1956
40.0 C (104.0 F)
1957
38.3 C (100.9 F)
1958
38.9 C (102.0 F)
1959
39.4 C (102.9 F)
1960
40.0 C (104.0 F)
1961
39.4 C (102.9 F)
1962
37.2 C (99.0 F)
1963
37.2 C (99.0 F)
1964
38.3 C (100.9 F)
1965
36.1 C (97.0 F)
1966
38.3 C (100.9 F)
1967
38.3 C (100.9 F)
1968
39.4 C (102.9 F)
1969
39.4 C (102.9 F)
1970
38.9 C (102.0 F)
1971
37.8 C (100.0 F)
1972
38.3 C (100.9 F)
1973
41.7 C (107.1 F)
1974
29.4 C (84.9 F)
Coldest night (TNn)
The coldest night of the year at Twin Falls 2 NNE, 1905 to 1974. The record is -34.4 C (-29.9 F) in 1922, marked on the chart; the median year is -20.6 C (-5.1 F).
Coldest night (TNn) at Twin Falls 2 NNE by year
Year
Coldest night (TNn)
1905
-17.2 C (1.0 F)
1906
-22.2 C (-8.0 F)
1907
-16.7 C (1.9 F)
1908
-21.1 C (-6.0 F)
1909
-17.8 C (0.0 F)
1910
-28.9 C (-20.0 F)
1911
-17.8 C (0.0 F)
1912
-26.1 C (-15.0 F)
1913
-25.0 C (-13.0 F)
1914
-23.3 C (-9.9 F)
1915
-22.2 C (-8.0 F)
1916
-20.0 C (-4.0 F)
1917
-25.6 C (-14.1 F)
1918
-16.1 C (3.0 F)
1919
-26.1 C (-15.0 F)
1920
-20.6 C (-5.1 F)
1921
-18.3 C (-0.9 F)
1922
-34.4 C (-29.9 F)
1923
-21.1 C (-6.0 F)
1924
-28.3 C (-18.9 F)
1925
-17.8 C (0.0 F)
1926
-23.3 C (-9.9 F)
1927
-23.9 C (-11.0 F)
1928
-24.4 C (-11.9 F)
1929
-23.9 C (-11.0 F)
1930
-30.0 C (-22.0 F)
1931
-21.1 C (-6.0 F)
1932
-27.2 C (-17.0 F)
1933
-31.1 C (-24.0 F)
1934
-11.1 C (12.0 F)
1935
-20.6 C (-5.1 F)
1936
-23.9 C (-11.0 F)
1937
-28.9 C (-20.0 F)
1938
-15.0 C (5.0 F)
1939
-13.9 C (7.0 F)
1940
-17.8 C (0.0 F)
1941
-18.3 C (-0.9 F)
1942
-29.4 C (-20.9 F)
1943
-19.4 C (-2.9 F)
1944
-19.4 C (-2.9 F)
1945
-17.8 C (0.0 F)
1946
-15.0 C (5.0 F)
1947
-20.6 C (-5.1 F)
1948
-20.6 C (-5.1 F)
1949
-32.2 C (-26.0 F)
1950
-25.0 C (-13.0 F)
1951
-20.0 C (-4.0 F)
1952
-22.8 C (-9.0 F)
1953
-12.2 C (10.0 F)
1954
-16.7 C (1.9 F)
1955
-22.2 C (-8.0 F)
1956
-22.8 C (-9.0 F)
1957
-21.1 C (-6.0 F)
1958
-13.9 C (7.0 F)
1959
-20.6 C (-5.1 F)
1960
-22.8 C (-9.0 F)
1961
-17.8 C (0.0 F)
1962
-31.7 C (-25.1 F)
1963
-26.1 C (-15.0 F)
1964
-18.9 C (-2.0 F)
1965
-14.4 C (6.1 F)
1966
-14.4 C (6.1 F)
1967
-19.4 C (-2.9 F)
1968
-18.9 C (-2.0 F)
1969
-15.0 C (5.0 F)
1970
-17.2 C (1.0 F)
1971
-18.3 C (-0.9 F)
1972
-27.8 C (-18.0 F)
1973
-16.1 C (3.0 F)
1974
-23.3 C (-9.9 F)
Wettest day (Rx1day)
The wettest day of the year at Twin Falls 2 NNE, 1905 to 1974. The record is 36.3 mm (1.4 in) in 1936, marked on the chart; the median year is 18.9 mm (0.7 in).
Wettest day (Rx1day) at Twin Falls 2 NNE by year
Year
Wettest day (Rx1day)
1905
15.2 mm (0.6 in)
1906
25.4 mm (1.0 in)
1907
31.2 mm (1.2 in)
1908
18.5 mm (0.7 in)
1909
30.2 mm (1.2 in)
1910
15.0 mm (0.6 in)
1911
23.9 mm (0.9 in)
1912
25.4 mm (1.0 in)
1913
24.1 mm (0.9 in)
1914
21.8 mm (0.9 in)
1915
23.9 mm (0.9 in)
1916
25.4 mm (1.0 in)
1917
13.7 mm (0.5 in)
1918
13.2 mm (0.5 in)
1919
13.5 mm (0.5 in)
1920
17.3 mm (0.7 in)
1921
19.3 mm (0.8 in)
1922
14.5 mm (0.6 in)
1923
30.5 mm (1.2 in)
1924
14.0 mm (0.6 in)
1925
26.2 mm (1.0 in)
1926
12.2 mm (0.5 in)
1927
17.8 mm (0.7 in)
1928
15.5 mm (0.6 in)
1929
20.8 mm (0.8 in)
1930
14.2 mm (0.6 in)
1931
21.3 mm (0.8 in)
1932
15.5 mm (0.6 in)
1933
7.6 mm (0.30 in)
1934
12.2 mm (0.5 in)
1935
24.4 mm (1.0 in)
1936
36.3 mm (1.4 in)
1937
25.1 mm (1.0 in)
1938
20.6 mm (0.8 in)
1939
24.4 mm (1.0 in)
1940
22.6 mm (0.9 in)
1941
19.6 mm (0.8 in)
1942
17.5 mm (0.7 in)
1943
13.2 mm (0.5 in)
1944
21.6 mm (0.9 in)
1945
12.2 mm (0.5 in)
1946
24.4 mm (1.0 in)
1947
19.6 mm (0.8 in)
1948
16.3 mm (0.6 in)
1949
11.4 mm (0.4 in)
1950
16.5 mm (0.6 in)
1951
16.8 mm (0.7 in)
1952
9.4 mm (0.37 in)
1953
14.2 mm (0.6 in)
1954
13.7 mm (0.5 in)
1955
14.5 mm (0.6 in)
1956
24.9 mm (1.0 in)
1957
20.1 mm (0.8 in)
1958
16.8 mm (0.7 in)
1959
36.1 mm (1.4 in)
1960
16.0 mm (0.6 in)
1961
15.2 mm (0.6 in)
1962
18.3 mm (0.7 in)
1963
26.7 mm (1.1 in)
1964
30.7 mm (1.2 in)
1965
9.7 mm (0.38 in)
1966
9.1 mm (0.36 in)
1967
22.1 mm (0.9 in)
1968
26.2 mm (1.0 in)
1969
10.9 mm (0.4 in)
1970
21.6 mm (0.9 in)
1971
19.8 mm (0.8 in)
1972
19.8 mm (0.8 in)
1973
32.3 mm (1.3 in)
1974
16.0 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Twin Falls 2 NNE, 1905 to 1974. The record is 66.0 mm (2.6 in) in 1909, marked on the chart; the median year is 32.4 mm (1.3 in).
Wettest five days (Rx5day) at Twin Falls 2 NNE by year
Year
Wettest five days (Rx5day)
1905
15.2 mm (0.6 in)
1906
30.8 mm (1.2 in)
1907
42.5 mm (1.7 in)
1908
61.2 mm (2.4 in)
1909
66.0 mm (2.6 in)
1910
32.3 mm (1.3 in)
1911
37.5 mm (1.5 in)
1912
33.3 mm (1.3 in)
1913
37.4 mm (1.5 in)
1914
33.6 mm (1.3 in)
1915
36.4 mm (1.4 in)
1916
36.3 mm (1.4 in)
1917
24.2 mm (1.0 in)
1918
19.6 mm (0.8 in)
1919
20.6 mm (0.8 in)
1920
29.7 mm (1.2 in)
1921
32.6 mm (1.3 in)
1922
27.7 mm (1.1 in)
1923
34.0 mm (1.3 in)
1924
22.9 mm (0.9 in)
1925
36.9 mm (1.5 in)
1926
17.5 mm (0.7 in)
1927
30.4 mm (1.2 in)
1928
37.6 mm (1.5 in)
1929
22.1 mm (0.9 in)
1930
39.6 mm (1.6 in)
1931
32.4 mm (1.3 in)
1932
24.7 mm (1.0 in)
1933
8.7 mm (0.34 in)
1934
29.3 mm (1.2 in)
1935
39.9 mm (1.6 in)
1936
60.4 mm (2.4 in)
1937
51.1 mm (2.0 in)
1938
34.8 mm (1.4 in)
1939
28.2 mm (1.1 in)
1940
40.1 mm (1.6 in)
1941
24.9 mm (1.0 in)
1942
39.1 mm (1.5 in)
1943
29.5 mm (1.2 in)
1944
49.8 mm (2.0 in)
1945
30.2 mm (1.2 in)
1946
36.5 mm (1.4 in)
1947
35.9 mm (1.4 in)
1948
37.2 mm (1.5 in)
1949
21.5 mm (0.8 in)
1950
32.4 mm (1.3 in)
1951
24.2 mm (1.0 in)
1952
13.7 mm (0.5 in)
1953
33.0 mm (1.3 in)
1954
13.9 mm (0.5 in)
1955
14.5 mm (0.6 in)
1956
29.2 mm (1.1 in)
1957
37.1 mm (1.5 in)
1958
25.2 mm (1.0 in)
1959
37.4 mm (1.5 in)
1960
22.9 mm (0.9 in)
1961
24.4 mm (1.0 in)
1962
32.3 mm (1.3 in)
1963
47.2 mm (1.9 in)
1964
60.2 mm (2.4 in)
1965
20.8 mm (0.8 in)
1966
15.5 mm (0.6 in)
1967
24.6 mm (1.0 in)
1968
65.0 mm (2.6 in)
1969
14.2 mm (0.6 in)
1970
33.7 mm (1.3 in)
1971
48.7 mm (1.9 in)
1972
49.0 mm (1.9 in)
1973
36.9 mm (1.5 in)
1974
20.1 mm (0.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Twin Falls 2 NNE, 1905 to 1974. The record is 121 days in 1934, marked on the chart; the median year is 49 days.
Longest dry spell (CDD) at Twin Falls 2 NNE by year
Year
Longest dry spell (CDD)
1905
52 days
1906
50 days
1907
34 days
1908
45 days
1909
33 days
1910
61 days
1911
37 days
1912
36 days
1913
27 days
1914
49 days
1915
50 days
1916
76 days
1917
50 days
1918
24 days
1919
42 days
1920
29 days
1921
52 days
1922
43 days
1923
36 days
1924
40 days
1925
20 days
1926
49 days
1927
69 days
1928
94 days
1929
69 days
1930
23 days
1931
73 days
1932
37 days
1933
92 days
1934
121 days
1935
106 days
1936
49 days
1937
57 days
1938
34 days
1939
51 days
1940
88 days
1941
23 days
1942
58 days
1943
49 days
1944
39 days
1945
42 days
1946
49 days
1947
55 days
1948
76 days
1949
38 days
1950
44 days
1951
45 days
1952
116 days
1953
58 days
1954
89 days
1955
33 days
1956
52 days
1957
42 days
1958
50 days
1959
53 days
1960
53 days
1961
31 days
1962
41 days
1963
35 days
1964
37 days
1965
54 days
1966
78 days
1967
54 days
1968
66 days
1969
65 days
1970
31 days
1971
39 days
1972
40 days
1973
25 days
1974
37 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
64 years with a frost
Across 64 years with a frost, the median last spring frost at Twin Falls 2 NNE falls on 18 May and the median first autumn frost on 19 September, which leaves a median of 125 days between them.
In 1944 to 1973 the median growing season was 136 days. That is 18 days more than in 1906 to 1939.
Fitted over all years, the growing season changes by +6.2 days per decade at this station.
Frost dates and growing season at Twin Falls 2 NNE
Measure
Median, all years
Earliest period (1906 to 1939)
Recent period (1944 to 1973)
Recent against earliest
Fitted trend
Last spring frost
18 May
21 May
11 May
10 days earlier
-3.1 days per decade
First autumn frost
19 September
15 September
22 September
7 days later
+3.1 days per decade
Growing days
125 days
118 days
136 days
18 days more
+6.2 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
67 years, 1906 to 1973
A day with at least 19.1 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 37.8 mm (1.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Twin Falls 2 NNE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
19.1 mm (0.8 in)
5 years
25.1 mm (1.0 in)
10 years
28.7 mm (1.1 in)
25 years
32.7 mm (1.3 in)
50 years
35.4 mm (1.4 in)
100 years
37.8 mm (1.5 in)
Longer than the 67 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, 67 years of values from 1906 to 1973.
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: 36.3 mm (1.4 in) in 1936; 36.1 mm (1.4 in) in 1959; 32.3 mm (1.3 in) in 1973.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Twin Falls 2 NNE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Twin Falls 2 NNE 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.