Record envelope, standing records and threshold days for Park Valley (USC00426658), Utah, United States, with 80 years of record.
Key Facts for Park Valley
Park Valley (USC00426658) is a weather station in Utah, United States at 41.80 latitude and -113.35 longitude, 1,658 m (5,440 ft) above sea level.
The station reports from 1911 to 1990, 80 years of record.
1,464 records set at Park Valley still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Park Valley set a daily record low maximum temperature of -6.7 C (19.9 F) on 15 February 1990.
About the Station
Location: Utah, United States, 41.80 latitude, -113.35 longitude.
Elevation: 1,658 m (5,440 ft).
Period of record: 1911 to 1990, 80 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 Park Valley. 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 Park Valley, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.8 C (55.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Feb
16.1 C (61.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Mar
22.8 C (73.0 F)
-16.7 C (1.9 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-15.0 C (5.0 F)
n/a
n/a
May
31.1 C (88.0 F)
-7.8 C (18.0 F)
n/a
n/a
Jun
36.7 C (98.1 F)
-2.8 C (27.0 F)
n/a
n/a
Jul
38.3 C (100.9 F)
1.7 C (35.1 F)
n/a
n/a
Aug
37.8 C (100.0 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
29.4 C (84.9 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
21.1 C (70.0 F)
-23.9 C (-11.0 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-33.3 C (-27.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Park Valley still stand. 1934 holds the most, with 54.
Standing records at Park Valley by the year they were set
Year set
Standing records
1929
5
1930
18
1931
43
1932
33
1933
33
1934
54
1935
30
1936
28
1937
31
1938
31
1939
24
1940
28
1941
19
1942
26
1943
27
1944
10
1945
28
1946
14
1947
32
1948
35
1949
44
1950
34
1951
12
1952
18
1953
21
1954
28
1955
27
1956
24
1957
13
1958
40
1959
23
1960
45
1961
18
1962
17
1963
31
1964
21
1965
27
1966
25
1967
14
1968
20
1969
18
1970
14
1971
12
1972
38
1973
12
1974
20
1975
27
1976
11
1977
27
1978
29
1979
16
1980
12
1981
20
1982
25
1983
26
1984
28
1985
4
1986
4
1987
26
1988
25
1989
16
1990
3
All-Time Record Progression
3 new records
3 all-time records were set at Park Valley between 10 December 1972 and 17 August 1984. Each dot is a new record.
When Park Valley set new all-time records
Date
Kind
Detail
1972-12-10
Record low minimum temperature
Record low minimum temperature -33.3 C (-27.9 F)
1974-10-30
Record daily precipitation
Record daily precipitation 44.5 mm (1.8 in)
1984-08-17
Record daily precipitation
Record daily precipitation 72.1 mm (2.8 in)
Wettest Day of Each Month
Aug: 72.1 mm (2.8 in)
The wettest day on record for each calendar month at Park Valley. The most was 72.1 mm (2.8 in) on 17 August 1984.
Record daily precipitation for each month at Park Valley
Month
Record daily precipitation (mm)
Date
Jan
42.2 mm (1.7 in)
1 January 1922
Feb
19.6 mm (0.8 in)
8 February 1960
Mar
20.3 mm (0.8 in)
13 March 1946
Apr
33.5 mm (1.3 in)
20 April 1981
May
32.8 mm (1.3 in)
23 May 1959
Jun
35.6 mm (1.4 in)
3 June 1914
Jul
42.9 mm (1.7 in)
31 July 1937
Aug
72.1 mm (2.8 in)
17 August 1984
Sep
36.6 mm (1.4 in)
23 September 1934
Oct
44.5 mm (1.8 in)
30 October 1974
Nov
29.0 mm (1.1 in)
24 November 1965
Dec
31.5 mm (1.2 in)
20 December 1921
Period of Record Coverage
1929 to 1990
Complete yearUnder 90 percent of days
62 years of record at Park Valley, 1929 to 1990. 17 years have data for under 90 percent of days and are left out of rankings: 1929, 1937, 1951, 1962, 1963, 1964, 1966, 1967 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 44 complete years at Park Valley, 1930 to 1989. Blue stripes are years cooler than the station's own mean of 8.1 C (46.6 F); red stripes are warmer. The coolest year was 1984, at 6.0 C (42.7 F), and the warmest was 1934, at 10.7 C (51.2 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Park Valley as warming stripes, 1930 to 1989
Year
Annual mean temperature
Difference from the station mean
1930
7.5 C
-0.59 C
1931
8.3 C
+0.17 C
1932
7.0 C
-1.12 C
1933
8.0 C
-0.07 C
1934
10.7 C
+2.57 C
1935
8.6 C
+0.44 C
1936
8.7 C
+0.60 C
1938
8.5 C
+0.35 C
1939
8.9 C
+0.76 C
1940
9.9 C
+1.74 C
1941
8.0 C
-0.16 C
1942
7.3 C
-0.84 C
1944
7.3 C
-0.81 C
1945
7.7 C
-0.40 C
1946
8.2 C
+0.09 C
1948
7.5 C
-0.57 C
1949
7.7 C
-0.37 C
1950
7.9 C
-0.23 C
1952
8.1 C
-0.06 C
1953
8.8 C
+0.73 C
1954
8.9 C
+0.80 C
1955
7.4 C
-0.74 C
1956
8.6 C
+0.44 C
1957
8.5 C
+0.35 C
1958
9.8 C
+1.66 C
1959
8.8 C
+0.70 C
1960
8.8 C
+0.67 C
1965
7.9 C
-0.19 C
1967
8.3 C
+0.23 C
1968
7.6 C
-0.56 C
1974
8.2 C
+0.05 C
1975
6.7 C
-1.41 C
1976
7.5 C
-0.65 C
1977
8.3 C
+0.19 C
1978
7.6 C
-0.51 C
1979
7.3 C
-0.85 C
1980
8.0 C
-0.08 C
1981
9.0 C
+0.88 C
1982
6.6 C
-1.51 C
1983
7.4 C
-0.74 C
1984
6.0 C
-2.15 C
1987
8.6 C
+0.44 C
1988
8.9 C
+0.74 C
1989
8.2 C
+0.07 C
The fitted trend in annual mean temperature here over 1930 to 1989 is -0.12 C (-0.26 to 0.02) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.21 F (-0.47 to 0.04) per decade. The slope is a straight line fitted to 44 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Park Valley
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.12 C (-0.26 to 0.02) per decade
-0.21 F (-0.47 to 0.04) per decade
1930 to 1989
44
Not clearly different from zero
Mean daily maximum
-0.18 C (-0.34 to -0.02) per decade
-0.32 F (-0.60 to -0.03) per decade
1930 to 1989
44
Fall
Mean daily minimum
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.2) per decade
1930 to 1989
44
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
1911 to 1990
Yearly extremes at Park Valley: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.3 C (100.9 F)
1931
35.0 C (95.0 F)
62
Coldest night (TNn)
-33.3 C (-27.9 F)
1972
-21.4 C (-6.5 F)
62
Wettest day (Rx1day)
72.1 mm (2.8 in)
1984
23.1 mm (0.9 in)
80
Wettest five days (Rx5day)
79.0 mm (3.1 in)
1984
35.1 mm (1.4 in)
79
Longest dry spell (CDD)
89 days
1976
34 days
80
Hottest day (TXx)
The hottest day of the year at Park Valley, 1911 to 1990. The record is 38.3 C (100.9 F) in 1931, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Park Valley by year
Year
Hottest day (TXx)
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
12.2 C (54.0 F)
1930
34.4 C (93.9 F)
1931
38.3 C (100.9 F)
1932
35.6 C (96.1 F)
1933
36.1 C (97.0 F)
1934
35.6 C (96.1 F)
1935
36.1 C (97.0 F)
1936
35.6 C (96.1 F)
1937
35.0 C (95.0 F)
1938
33.9 C (93.0 F)
1939
36.1 C (97.0 F)
1940
37.8 C (100.0 F)
1941
35.0 C (95.0 F)
1942
33.9 C (93.0 F)
1943
37.2 C (99.0 F)
1944
33.3 C (91.9 F)
1945
33.9 C (93.0 F)
1946
36.1 C (97.0 F)
1947
35.6 C (96.1 F)
1948
34.4 C (93.9 F)
1949
36.1 C (97.0 F)
1950
35.0 C (95.0 F)
1951
35.0 C (95.0 F)
1952
34.4 C (93.9 F)
1953
34.4 C (93.9 F)
1954
37.2 C (99.0 F)
1955
36.1 C (97.0 F)
1956
35.6 C (96.1 F)
1957
33.9 C (93.0 F)
1958
35.0 C (95.0 F)
1959
36.1 C (97.0 F)
1960
36.7 C (98.1 F)
1961
36.1 C (97.0 F)
1962
37.2 C (99.0 F)
1963
35.0 C (95.0 F)
1964
33.9 C (93.0 F)
1965
32.2 C (90.0 F)
1966
37.2 C (99.0 F)
1967
33.9 C (93.0 F)
1968
34.4 C (93.9 F)
1969
35.6 C (96.1 F)
1970
34.4 C (93.9 F)
1971
23.9 C (75.0 F)
1972
35.0 C (95.0 F)
1973
35.0 C (95.0 F)
1974
34.4 C (93.9 F)
1975
35.0 C (95.0 F)
1976
34.4 C (93.9 F)
1977
36.1 C (97.0 F)
1978
35.6 C (96.1 F)
1979
36.1 C (97.0 F)
1980
33.3 C (91.9 F)
1981
34.4 C (93.9 F)
1982
33.9 C (93.0 F)
1983
34.4 C (93.9 F)
1984
34.4 C (93.9 F)
1985
35.6 C (96.1 F)
1986
28.3 C (82.9 F)
1987
31.7 C (89.1 F)
1988
38.3 C (100.9 F)
1989
35.6 C (96.1 F)
1990
12.8 C (55.0 F)
Coldest night (TNn)
The coldest night of the year at Park Valley, 1911 to 1990. The record is -33.3 C (-27.9 F) in 1972, marked on the chart; the median year is -21.4 C (-6.5 F).
Coldest night (TNn) at Park Valley by year
Year
Coldest night (TNn)
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
-12.8 C (9.0 F)
1930
-27.8 C (-18.0 F)
1931
-18.3 C (-0.9 F)
1932
-27.2 C (-17.0 F)
1933
-29.4 C (-20.9 F)
1934
-11.7 C (10.9 F)
1935
-21.7 C (-7.1 F)
1936
-23.3 C (-9.9 F)
1937
-32.2 C (-26.0 F)
1938
-17.2 C (1.0 F)
1939
-18.3 C (-0.9 F)
1940
-17.8 C (0.0 F)
1941
-18.9 C (-2.0 F)
1942
-24.4 C (-11.9 F)
1943
-22.8 C (-9.0 F)
1944
-19.4 C (-2.9 F)
1945
-18.3 C (-0.9 F)
1946
-18.3 C (-0.9 F)
1947
-21.7 C (-7.1 F)
1948
-21.1 C (-6.0 F)
1949
-26.1 C (-15.0 F)
1950
-23.3 C (-9.9 F)
1951
-25.0 C (-13.0 F)
1952
-21.7 C (-7.1 F)
1953
-14.4 C (6.1 F)
1954
-18.9 C (-2.0 F)
1955
-23.9 C (-11.0 F)
1956
-25.0 C (-13.0 F)
1957
-19.4 C (-2.9 F)
1958
-17.8 C (0.0 F)
1959
-21.1 C (-6.0 F)
1960
-21.7 C (-7.1 F)
1961
-15.0 C (5.0 F)
1962
-18.9 C (-2.0 F)
1963
-29.4 C (-20.9 F)
1964
-23.9 C (-11.0 F)
1965
-16.7 C (1.9 F)
1966
-17.2 C (1.0 F)
1967
-17.8 C (0.0 F)
1968
-19.4 C (-2.9 F)
1969
-16.7 C (1.9 F)
1970
-19.4 C (-2.9 F)
1971
-22.2 C (-8.0 F)
1972
-33.3 C (-27.9 F)
1973
-23.3 C (-9.9 F)
1974
-22.8 C (-9.0 F)
1975
-21.7 C (-7.1 F)
1976
-18.9 C (-2.0 F)
1977
-21.1 C (-6.0 F)
1978
-25.0 C (-13.0 F)
1979
-26.7 C (-16.1 F)
1980
-22.8 C (-9.0 F)
1981
-16.7 C (1.9 F)
1982
-27.2 C (-17.0 F)
1983
-23.3 C (-9.9 F)
1984
-25.0 C (-13.0 F)
1985
-22.8 C (-9.0 F)
1986
-15.6 C (3.9 F)
1987
-17.2 C (1.0 F)
1988
-20.6 C (-5.1 F)
1989
-23.9 C (-11.0 F)
1990
-17.2 C (1.0 F)
Wettest day (Rx1day)
The wettest day of the year at Park Valley, 1911 to 1990. The record is 72.1 mm (2.8 in) in 1984, marked on the chart; the median year is 23.1 mm (0.9 in).
Wettest day (Rx1day) at Park Valley by year
Year
Wettest day (Rx1day)
1911
19.1 mm (0.8 in)
1912
33.0 mm (1.3 in)
1913
33.0 mm (1.3 in)
1914
35.6 mm (1.4 in)
1915
20.3 mm (0.8 in)
1916
27.9 mm (1.1 in)
1917
16.8 mm (0.7 in)
1918
21.6 mm (0.9 in)
1919
27.9 mm (1.1 in)
1920
16.8 mm (0.7 in)
1921
35.6 mm (1.4 in)
1922
42.2 mm (1.7 in)
1923
39.1 mm (1.5 in)
1924
16.8 mm (0.7 in)
1925
16.8 mm (0.7 in)
1926
22.6 mm (0.9 in)
1927
16.8 mm (0.7 in)
1928
27.7 mm (1.1 in)
1929
34.3 mm (1.4 in)
1930
17.3 mm (0.7 in)
1931
34.8 mm (1.4 in)
1932
27.9 mm (1.1 in)
1933
19.8 mm (0.8 in)
1934
36.6 mm (1.4 in)
1935
20.1 mm (0.8 in)
1936
22.9 mm (0.9 in)
1937
42.9 mm (1.7 in)
1938
21.3 mm (0.8 in)
1939
16.5 mm (0.6 in)
1940
30.5 mm (1.2 in)
1941
26.7 mm (1.1 in)
1942
26.9 mm (1.1 in)
1943
14.5 mm (0.6 in)
1944
24.1 mm (0.9 in)
1945
24.1 mm (0.9 in)
1946
20.3 mm (0.8 in)
1947
14.0 mm (0.6 in)
1948
16.0 mm (0.6 in)
1949
20.8 mm (0.8 in)
1950
26.4 mm (1.0 in)
1951
17.8 mm (0.7 in)
1952
29.7 mm (1.2 in)
1953
39.1 mm (1.5 in)
1954
14.5 mm (0.6 in)
1955
27.7 mm (1.1 in)
1956
22.6 mm (0.9 in)
1957
23.9 mm (0.9 in)
1958
21.8 mm (0.9 in)
1959
32.8 mm (1.3 in)
1960
21.8 mm (0.9 in)
1961
21.3 mm (0.8 in)
1962
16.5 mm (0.6 in)
1963
23.1 mm (0.9 in)
1964
32.8 mm (1.3 in)
1965
37.1 mm (1.5 in)
1966
16.0 mm (0.6 in)
1967
26.4 mm (1.0 in)
1968
30.5 mm (1.2 in)
1969
21.3 mm (0.8 in)
1970
24.9 mm (1.0 in)
1971
23.1 mm (0.9 in)
1972
37.8 mm (1.5 in)
1973
21.6 mm (0.9 in)
1974
44.5 mm (1.8 in)
1975
15.5 mm (0.6 in)
1976
21.6 mm (0.9 in)
1977
25.9 mm (1.0 in)
1978
16.8 mm (0.7 in)
1979
21.8 mm (0.9 in)
1980
27.2 mm (1.1 in)
1981
33.5 mm (1.3 in)
1982
31.0 mm (1.2 in)
1983
31.5 mm (1.2 in)
1984
72.1 mm (2.8 in)
1985
16.5 mm (0.6 in)
1986
10.7 mm (0.4 in)
1987
25.9 mm (1.0 in)
1988
20.1 mm (0.8 in)
1989
13.5 mm (0.5 in)
1990
12.7 mm (0.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Park Valley, 1911 to 1990. The record is 79.0 mm (3.1 in) in 1984, marked on the chart; the median year is 35.1 mm (1.4 in).
Wettest five days (Rx5day) at Park Valley by year
Year
Wettest five days (Rx5day)
1911
24.9 mm (1.0 in)
1912
48.0 mm (1.9 in)
1913
45.2 mm (1.8 in)
1914
14.5 mm (0.6 in)
1915
20.4 mm (0.8 in)
1916
33.0 mm (1.3 in)
1917
19.0 mm (0.7 in)
1918
n/a
1919
28.5 mm (1.1 in)
1920
43.9 mm (1.7 in)
1921
44.2 mm (1.7 in)
1922
22.4 mm (0.9 in)
1923
50.3 mm (2.0 in)
1924
28.2 mm (1.1 in)
1925
38.5 mm (1.5 in)
1926
24.4 mm (1.0 in)
1927
26.2 mm (1.0 in)
1928
34.2 mm (1.3 in)
1929
35.1 mm (1.4 in)
1930
44.9 mm (1.8 in)
1931
34.8 mm (1.4 in)
1932
30.3 mm (1.2 in)
1933
28.7 mm (1.1 in)
1934
47.8 mm (1.9 in)
1935
33.7 mm (1.3 in)
1936
42.4 mm (1.7 in)
1937
48.2 mm (1.9 in)
1938
59.6 mm (2.3 in)
1939
24.9 mm (1.0 in)
1940
39.4 mm (1.6 in)
1941
42.9 mm (1.7 in)
1942
55.9 mm (2.2 in)
1943
24.9 mm (1.0 in)
1944
48.0 mm (1.9 in)
1945
57.6 mm (2.3 in)
1946
27.5 mm (1.1 in)
1947
25.9 mm (1.0 in)
1948
30.1 mm (1.2 in)
1949
53.0 mm (2.1 in)
1950
37.6 mm (1.5 in)
1951
31.8 mm (1.3 in)
1952
40.1 mm (1.6 in)
1953
70.4 mm (2.8 in)
1954
23.8 mm (0.9 in)
1955
39.1 mm (1.5 in)
1956
34.0 mm (1.3 in)
1957
40.7 mm (1.6 in)
1958
24.9 mm (1.0 in)
1959
58.1 mm (2.3 in)
1960
26.4 mm (1.0 in)
1961
33.2 mm (1.3 in)
1962
18.8 mm (0.7 in)
1963
39.4 mm (1.6 in)
1964
48.3 mm (1.9 in)
1965
51.4 mm (2.0 in)
1966
32.2 mm (1.3 in)
1967
32.8 mm (1.3 in)
1968
49.3 mm (1.9 in)
1969
28.7 mm (1.1 in)
1970
31.2 mm (1.2 in)
1971
50.4 mm (2.0 in)
1972
52.2 mm (2.1 in)
1973
26.5 mm (1.0 in)
1974
54.4 mm (2.1 in)
1975
38.8 mm (1.5 in)
1976
33.0 mm (1.3 in)
1977
46.5 mm (1.8 in)
1978
35.4 mm (1.4 in)
1979
33.0 mm (1.3 in)
1980
63.9 mm (2.5 in)
1981
51.7 mm (2.0 in)
1982
52.6 mm (2.1 in)
1983
43.7 mm (1.7 in)
1984
79.0 mm (3.1 in)
1985
22.1 mm (0.9 in)
1986
15.1 mm (0.6 in)
1987
68.5 mm (2.7 in)
1988
32.2 mm (1.3 in)
1989
24.9 mm (1.0 in)
1990
20.3 mm (0.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Park Valley, 1911 to 1990. The record is 89 days in 1976, marked on the chart; the median year is 34 days.
Longest dry spell (CDD) at Park Valley by year
Year
Longest dry spell (CDD)
1911
12 days
1912
34 days
1913
25 days
1914
22 days
1915
46 days
1916
48 days
1917
23 days
1918
1 day
1919
10 days
1920
17 days
1921
1 day
1922
20 days
1923
26 days
1924
28 days
1925
13 days
1926
42 days
1927
27 days
1928
16 days
1929
33 days
1930
21 days
1931
32 days
1932
25 days
1933
39 days
1934
43 days
1935
84 days
1936
34 days
1937
23 days
1938
29 days
1939
32 days
1940
36 days
1941
18 days
1942
44 days
1943
42 days
1944
70 days
1945
28 days
1946
34 days
1947
37 days
1948
42 days
1949
48 days
1950
34 days
1951
47 days
1952
70 days
1953
38 days
1954
47 days
1955
53 days
1956
55 days
1957
32 days
1958
42 days
1959
62 days
1960
33 days
1961
30 days
1962
40 days
1963
43 days
1964
45 days
1965
39 days
1966
38 days
1967
26 days
1968
33 days
1969
52 days
1970
32 days
1971
31 days
1972
35 days
1973
36 days
1974
41 days
1975
25 days
1976
89 days
1977
48 days
1978
45 days
1979
36 days
1980
31 days
1981
39 days
1982
26 days
1983
21 days
1984
15 days
1985
23 days
1986
33 days
1987
48 days
1988
64 days
1989
44 days
1990
18 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
44 years with a frost
Across 44 years with a frost, the median last spring frost at Park Valley falls on 22 May and the median first autumn frost on 23 September, which leaves a median of 127 days between them.
Fitted over all years, the growing season changes by -1.6 days per decade at this station.
Frost dates and growing season at Park Valley
Measure
Median, all years
Earliest period
Recent period (1946 to 1989)
Recent against earliest
Fitted trend
Last spring frost
22 May
n/a
23 May
n/a
+0.8 days per decade
First autumn frost
23 September
n/a
22 September
n/a
-0.8 days per decade
Growing days
127 days
n/a
128 days
n/a
-1.6 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
45 years, 1916 to 1989
A day with at least 23.8 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 60.4 mm (2.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Park Valley: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
23.8 mm (0.9 in)
5 years
32.0 mm (1.3 in)
10 years
38.0 mm (1.5 in)
25 years
46.3 mm (1.8 in)
50 years
53.1 mm (2.1 in)
Longer than the 45 years of record
100 years
60.4 mm (2.4 in)
Longer than the 45 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, 45 years of values from 1916 to 1989.
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: 72.1 mm (2.8 in) in 1984; 44.5 mm (1.8 in) in 1974; 39.1 mm (1.5 in) in 1953.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Park Valley standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Park Valley 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.