Record envelope, standing records and threshold days for Sunnyside (USC00428474), Utah, United States, with 84 years of record.
Key Facts for Sunnyside
Sunnyside (USC00428474) is a weather station in Utah, United States at 39.57 latitude and -110.37 longitude, 2,068 m (6,785 ft) above sea level.
The station reports from 1905 to 1988, 84 years of record.
1,464 records set at Sunnyside still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Sunnyside set a daily record precipitation of 14.5 mm (0.6 in) on 28 June 1988.
About the Station
Location: Utah, United States, 39.57 latitude, -110.37 longitude.
Elevation: 2,068 m (6,785 ft).
Period of record: 1905 to 1988, 84 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 Sunnyside. 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 Sunnyside, 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)
-26.7 C (-16.1 F)
n/a
n/a
Feb
16.1 C (61.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Mar
19.4 C (66.9 F)
-18.3 C (-0.9 F)
n/a
n/a
Apr
27.2 C (81.0 F)
-15.6 C (3.9 F)
n/a
n/a
May
34.4 C (93.9 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
35.0 C (95.0 F)
-2.2 C (28.0 F)
n/a
n/a
Jul
35.6 C (96.1 F)
0.0 C (32.0 F)
n/a
n/a
Aug
36.7 C (98.1 F)
1.7 C (35.1 F)
n/a
n/a
Sep
33.3 C (91.9 F)
-4.4 C (24.1 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-12.2 C (10.0 F)
n/a
n/a
Nov
19.4 C (66.9 F)
-18.3 C (-0.9 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-24.4 C (-11.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Sunnyside still stand. 1921 holds the most, with 75.
Standing records at Sunnyside by the year they were set
Year set
Standing records
1920
34
1921
75
1922
56
1923
35
1924
54
1925
46
1926
38
1927
49
1928
43
1929
50
1930
7
1958
40
1959
27
1960
56
1961
21
1962
34
1963
24
1966
28
1967
39
1968
29
1969
61
1970
31
1971
39
1972
5
1973
10
1974
13
1975
47
1976
23
1977
29
1978
40
1979
54
1980
44
1981
19
1982
44
1983
36
1984
43
1985
50
1986
44
1987
29
1988
18
All-Time Record Progression
2 new records
2 all-time records were set at Sunnyside between 1 February 1985 and 2 February 1985. Each dot is a new record.
When Sunnyside set new all-time records
Date
Kind
Detail
1985-02-01
Record low minimum temperature
Record low minimum temperature -27.2 C (-17.0 F)
1985-02-02
Record low maximum temperature
Record low maximum temperature -15.6 C (3.9 F)
Wettest Day of Each Month
Oct: 63.5 mm (2.5 in)
The wettest day on record for each calendar month at Sunnyside. The most was 63.5 mm (2.5 in) on 5 October 1925.
Record daily precipitation for each month at Sunnyside
Month
Record daily precipitation (mm)
Date
Jan
37.1 mm (1.5 in)
14 January 1969
Feb
41.4 mm (1.6 in)
26 February 1969
Mar
30.5 mm (1.2 in)
15 March 1906
Apr
35.6 mm (1.4 in)
7 April 1906
May
27.9 mm (1.1 in)
12 May 1968
Jun
40.6 mm (1.6 in)
10 June 1970
Jul
50.3 mm (2.0 in)
28 July 1917
Aug
41.4 mm (1.6 in)
10 August 1925
Sep
50.8 mm (2.0 in)
29 September 1911
Oct
63.5 mm (2.5 in)
5 October 1925
Nov
43.2 mm (1.7 in)
20 November 1906
Dec
34.3 mm (1.4 in)
25 December 1916
Period of Record Coverage
1920 to 1988
Complete yearUnder 90 percent of days
40 years of record at Sunnyside, 1920 to 1988. 13 years have data for under 90 percent of days and are left out of rankings: 1920, 1930, 1958, 1959, 1960, 1961, 1963, 1966 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 26 complete years at Sunnyside, 1921 to 1987. Blue stripes are years cooler than the station's own mean of 7.7 C (45.9 F); red stripes are warmer. The coolest year was 1979, at 5.9 C (42.6 F), and the warmest was 1926, at 9.6 C (49.2 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Sunnyside as warming stripes, 1921 to 1987
Year
Annual mean temperature
Difference from the station mean
1921
9.5 C
+1.70 C
1922
7.9 C
+0.14 C
1923
8.1 C
+0.39 C
1924
8.1 C
+0.35 C
1926
9.6 C
+1.80 C
1927
8.9 C
+1.15 C
1928
9.4 C
+1.65 C
1929
8.5 C
+0.79 C
1960
8.9 C
+1.11 C
1967
8.5 C
+0.73 C
1968
7.7 C
-0.04 C
1969
8.5 C
+0.71 C
1970
7.7 C
-0.08 C
1975
6.0 C
-1.76 C
1976
7.5 C
-0.27 C
1977
8.1 C
+0.37 C
1978
7.0 C
-0.71 C
1979
5.9 C
-1.84 C
1980
7.3 C
-0.43 C
1981
8.2 C
+0.43 C
1982
5.9 C
-1.83 C
1983
6.7 C
-1.03 C
1984
5.9 C
-1.81 C
1985
6.8 C
-0.96 C
1986
7.5 C
-0.21 C
1987
7.4 C
-0.38 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
1905 to 1988
Yearly extremes at Sunnyside: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1969
33.3 C (91.9 F)
40
Coldest night (TNn)
-27.2 C (-17.0 F)
1985
-18.3 C (-0.9 F)
40
Wettest day (Rx1day)
63.5 mm (2.5 in)
1925
29.6 mm (1.2 in)
54
Wettest five days (Rx5day)
85.7 mm (3.4 in)
1980
46.1 mm (1.8 in)
53
Longest dry spell (CDD)
97 days
1976
36 days
54
Hottest day (TXx)
The hottest day of the year at Sunnyside, 1905 to 1988. The record is 36.7 C (98.1 F) in 1969, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Sunnyside by year
Year
Hottest day (TXx)
1905
n/a
1906
n/a
1907
n/a
1908
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1914
n/a
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1919
n/a
1920
33.9 C (93.0 F)
1921
34.4 C (93.9 F)
1922
35.6 C (96.1 F)
1923
33.3 C (91.9 F)
1924
33.9 C (93.0 F)
1925
35.6 C (96.1 F)
1926
34.4 C (93.9 F)
1927
33.9 C (93.0 F)
1928
33.9 C (93.0 F)
1929
33.9 C (93.0 F)
1930
13.3 C (55.9 F)
1958
35.0 C (95.0 F)
1959
33.3 C (91.9 F)
1960
35.0 C (95.0 F)
1961
33.9 C (93.0 F)
1962
33.3 C (91.9 F)
1963
17.8 C (64.0 F)
1966
33.3 C (91.9 F)
1967
35.0 C (95.0 F)
1968
35.0 C (95.0 F)
1969
36.7 C (98.1 F)
1970
33.3 C (91.9 F)
1971
20.0 C (68.0 F)
1972
33.9 C (93.0 F)
1973
33.3 C (91.9 F)
1974
33.3 C (91.9 F)
1975
31.7 C (89.1 F)
1976
32.8 C (91.0 F)
1977
32.2 C (90.0 F)
1978
33.3 C (91.9 F)
1979
36.1 C (97.0 F)
1980
32.2 C (90.0 F)
1981
33.3 C (91.9 F)
1982
33.3 C (91.9 F)
1983
32.2 C (90.0 F)
1984
31.1 C (88.0 F)
1985
33.9 C (93.0 F)
1986
33.3 C (91.9 F)
1987
31.7 C (89.1 F)
1988
33.3 C (91.9 F)
Coldest night (TNn)
The coldest night of the year at Sunnyside, 1905 to 1988. The record is -27.2 C (-17.0 F) in 1985, marked on the chart; the median year is -18.3 C (-0.9 F).
Coldest night (TNn) at Sunnyside by year
Year
Coldest night (TNn)
1905
n/a
1906
n/a
1907
n/a
1908
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1914
n/a
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1919
n/a
1920
-15.0 C (5.0 F)
1921
-13.9 C (7.0 F)
1922
-18.3 C (-0.9 F)
1923
-16.7 C (1.9 F)
1924
-23.3 C (-9.9 F)
1925
-17.2 C (1.0 F)
1926
-16.7 C (1.9 F)
1927
-17.8 C (0.0 F)
1928
-14.4 C (6.1 F)
1929
-19.4 C (-2.9 F)
1930
-21.7 C (-7.1 F)
1958
-15.0 C (5.0 F)
1959
-18.3 C (-0.9 F)
1960
-18.9 C (-2.0 F)
1961
-18.9 C (-2.0 F)
1962
-23.9 C (-11.0 F)
1963
-26.7 C (-16.1 F)
1966
-17.8 C (0.0 F)
1967
-21.1 C (-6.0 F)
1968
-20.6 C (-5.1 F)
1969
-16.7 C (1.9 F)
1970
-17.2 C (1.0 F)
1971
-24.4 C (-11.9 F)
1972
-9.4 C (15.1 F)
1973
-0.6 C (30.9 F)
1974
-17.8 C (0.0 F)
1975
-21.7 C (-7.1 F)
1976
-20.0 C (-4.0 F)
1977
-21.7 C (-7.1 F)
1978
-24.4 C (-11.9 F)
1979
-26.1 C (-15.0 F)
1980
-16.7 C (1.9 F)
1981
-17.2 C (1.0 F)
1982
-23.9 C (-11.0 F)
1983
-20.6 C (-5.1 F)
1984
-23.9 C (-11.0 F)
1985
-27.2 C (-17.0 F)
1986
-17.8 C (0.0 F)
1987
-16.1 C (3.0 F)
1988
-18.3 C (-0.9 F)
Wettest day (Rx1day)
The wettest day of the year at Sunnyside, 1905 to 1988. The record is 63.5 mm (2.5 in) in 1925, marked on the chart; the median year is 29.6 mm (1.2 in).
Wettest day (Rx1day) at Sunnyside by year
Year
Wettest day (Rx1day)
1905
30.5 mm (1.2 in)
1906
43.2 mm (1.7 in)
1907
15.2 mm (0.6 in)
1908
30.5 mm (1.2 in)
1909
34.8 mm (1.4 in)
1910
20.3 mm (0.8 in)
1911
50.8 mm (2.0 in)
1912
20.3 mm (0.8 in)
1914
4.8 mm (0.19 in)
1915
29.5 mm (1.2 in)
1916
34.3 mm (1.4 in)
1917
50.3 mm (2.0 in)
1918
29.7 mm (1.2 in)
1919
38.1 mm (1.5 in)
1920
23.1 mm (0.9 in)
1921
30.5 mm (1.2 in)
1922
43.2 mm (1.7 in)
1923
26.2 mm (1.0 in)
1924
45.0 mm (1.8 in)
1925
63.5 mm (2.5 in)
1926
19.8 mm (0.8 in)
1927
45.0 mm (1.8 in)
1928
55.4 mm (2.2 in)
1929
40.1 mm (1.6 in)
1930
11.9 mm (0.5 in)
1958
27.9 mm (1.1 in)
1959
27.2 mm (1.1 in)
1960
25.4 mm (1.0 in)
1961
28.4 mm (1.1 in)
1962
33.5 mm (1.3 in)
1963
16.5 mm (0.6 in)
1966
26.7 mm (1.1 in)
1967
19.1 mm (0.8 in)
1968
36.3 mm (1.4 in)
1969
41.4 mm (1.6 in)
1970
40.6 mm (1.6 in)
1971
12.2 mm (0.5 in)
1972
31.8 mm (1.3 in)
1973
22.6 mm (0.9 in)
1974
12.2 mm (0.5 in)
1975
19.3 mm (0.8 in)
1976
17.0 mm (0.7 in)
1977
25.9 mm (1.0 in)
1978
38.6 mm (1.5 in)
1979
17.0 mm (0.7 in)
1980
31.5 mm (1.2 in)
1981
24.1 mm (0.9 in)
1982
29.5 mm (1.2 in)
1983
39.1 mm (1.5 in)
1984
29.7 mm (1.2 in)
1985
50.5 mm (2.0 in)
1986
24.4 mm (1.0 in)
1987
32.5 mm (1.3 in)
1988
27.9 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Sunnyside, 1905 to 1988. The record is 85.7 mm (3.4 in) in 1980, marked on the chart; the median year is 46.1 mm (1.8 in).
Wettest five days (Rx5day) at Sunnyside by year
Year
Wettest five days (Rx5day)
1905
56.5 mm (2.2 in)
1906
85.2 mm (3.4 in)
1907
28.2 mm (1.1 in)
1908
31.8 mm (1.3 in)
1909
41.2 mm (1.6 in)
1910
42.7 mm (1.7 in)
1911
56.1 mm (2.2 in)
1912
22.1 mm (0.9 in)
1914
n/a
1915
68.1 mm (2.7 in)
1916
58.4 mm (2.3 in)
1917
64.3 mm (2.5 in)
1918
52.6 mm (2.1 in)
1919
26.9 mm (1.1 in)
1920
38.2 mm (1.5 in)
1921
50.4 mm (2.0 in)
1922
49.7 mm (2.0 in)
1923
28.7 mm (1.1 in)
1924
57.4 mm (2.3 in)
1925
74.4 mm (2.9 in)
1926
19.8 mm (0.8 in)
1927
63.0 mm (2.5 in)
1928
78.6 mm (3.1 in)
1929
75.4 mm (3.0 in)
1930
24.3 mm (1.0 in)
1958
37.0 mm (1.5 in)
1959
50.6 mm (2.0 in)
1960
64.7 mm (2.5 in)
1961
39.1 mm (1.5 in)
1962
44.0 mm (1.7 in)
1963
20.3 mm (0.8 in)
1966
38.1 mm (1.5 in)
1967
42.4 mm (1.7 in)
1968
54.1 mm (2.1 in)
1969
56.6 mm (2.2 in)
1970
72.7 mm (2.9 in)
1971
26.9 mm (1.1 in)
1972
46.1 mm (1.8 in)
1973
32.0 mm (1.3 in)
1974
29.5 mm (1.2 in)
1975
32.0 mm (1.3 in)
1976
31.5 mm (1.2 in)
1977
35.4 mm (1.4 in)
1978
62.2 mm (2.4 in)
1979
43.7 mm (1.7 in)
1980
85.7 mm (3.4 in)
1981
38.3 mm (1.5 in)
1982
70.9 mm (2.8 in)
1983
71.9 mm (2.8 in)
1984
22.9 mm (0.9 in)
1985
72.9 mm (2.9 in)
1986
34.5 mm (1.4 in)
1987
49.1 mm (1.9 in)
1988
75.7 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Sunnyside, 1905 to 1988. The record is 97 days in 1976, marked on the chart; the median year is 36 days.
Longest dry spell (CDD) at Sunnyside by year
Year
Longest dry spell (CDD)
1905
27 days
1906
29 days
1907
23 days
1908
37 days
1909
60 days
1910
39 days
1911
27 days
1912
3 days
1914
2 days
1915
45 days
1916
79 days
1917
27 days
1918
36 days
1919
21 days
1920
25 days
1921
36 days
1922
39 days
1923
28 days
1924
57 days
1925
26 days
1926
41 days
1927
35 days
1928
35 days
1929
48 days
1930
21 days
1958
46 days
1959
35 days
1960
51 days
1961
48 days
1962
56 days
1963
19 days
1966
25 days
1967
63 days
1968
38 days
1969
45 days
1970
38 days
1971
47 days
1972
28 days
1973
28 days
1974
67 days
1975
31 days
1976
97 days
1977
65 days
1978
40 days
1979
75 days
1980
37 days
1981
28 days
1982
33 days
1983
18 days
1984
29 days
1985
31 days
1986
29 days
1987
38 days
1988
42 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
26 years with a frost
Across 26 years with a frost, the median last spring frost at Sunnyside falls on 26 May and the median first autumn frost on 2 October, which leaves a median of 132 days between them.
Fitted over all years, the growing season changes by -2.2 days per decade at this station.
Frost dates and growing season at Sunnyside
Measure
Median, all years
Earliest period
Recent period (1921 to 1987)
Recent against earliest
Fitted trend
Last spring frost
26 May
n/a
26 May
n/a
+2.3 days per decade
First autumn frost
2 October
n/a
2 October
n/a
+0.1 days per decade
Growing days
132 days
n/a
132 days
n/a
-2.2 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
32 years, 1905 to 1987
A day with at least 30.6 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 54.3 mm (2.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Sunnyside: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
30.6 mm (1.2 in)
5 years
39.2 mm (1.5 in)
10 years
43.8 mm (1.7 in)
25 years
48.6 mm (1.9 in)
50 years
51.7 mm (2.0 in)
Longer than the 32 years of record
100 years
54.3 mm (2.1 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 1905 to 1987.
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: 50.5 mm (2.0 in) in 1985; 45.0 mm (1.8 in) in 1924; 45.0 mm (1.8 in) in 1927.
Download the Data
Data for Sunnyside standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Sunnyside 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.