Record envelope, standing records and threshold days for Hillside 4 NNE (USC00024053), Arizona, United States, with 99 years of record.
Key Facts for Hillside 4 NNE
Hillside 4 NNE (USC00024053) is a weather station in Arizona, United States at 34.47 latitude and -112.89 longitude, 1,012 m (3,320 ft) above sea level.
The station reports from 1899 to 1997, 99 years of record.
1,464 records set at Hillside 4 NNE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Hillside 4 NNE set a daily record high maximum temperature of 25.0 C (77.0 F) on 30 December 1997.
About the Station
Location: Arizona, United States, 34.47 latitude, -112.89 longitude.
Elevation: 1,012 m (3,320 ft).
Period of record: 1899 to 1997, 99 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 Hillside 4 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 Hillside 4 NNE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.8 C (82.0 F)
-16.1 C (3.0 F)
n/a
n/a
Feb
29.4 C (84.9 F)
-15.0 C (5.0 F)
n/a
n/a
Mar
32.8 C (91.0 F)
-10.6 C (12.9 F)
n/a
n/a
Apr
36.1 C (97.0 F)
-7.2 C (19.0 F)
n/a
n/a
May
40.0 C (104.0 F)
-7.2 C (19.0 F)
n/a
n/a
Jun
44.4 C (111.9 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
45.0 C (113.0 F)
1.1 C (34.0 F)
n/a
n/a
Aug
43.3 C (109.9 F)
4.4 C (39.9 F)
n/a
n/a
Sep
43.9 C (111.0 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
38.3 C (100.9 F)
-7.8 C (18.0 F)
n/a
n/a
Nov
31.1 C (88.0 F)
-13.3 C (8.1 F)
n/a
n/a
Dec
26.7 C (80.1 F)
-17.8 C (0.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hillside 4 NNE still stand. 1992 holds the most, with 69.
Standing records at Hillside 4 NNE by the year they were set
Year set
Standing records
1899
1
1955
44
1956
38
1957
44
1958
35
1959
30
1960
36
1961
26
1962
45
1963
27
1964
27
1965
23
1966
37
1967
33
1968
27
1969
37
1970
35
1971
46
1972
53
1973
27
1974
28
1975
31
1976
29
1977
43
1978
28
1979
32
1980
47
1981
26
1982
31
1983
19
1984
22
1985
37
1986
39
1987
35
1988
26
1989
32
1990
35
1991
31
1992
69
1993
26
1994
25
1995
34
1996
47
1997
21
All-Time Record Progression
6 new records
6 all-time records were set at Hillside 4 NNE between 3 February 1985 and 1 August 1997. Each dot is a new record.
When Hillside 4 NNE set new all-time records
Date
Kind
Detail
1985-02-03
Record daily snowfall
Record daily snowfall 22.9 cm (9.0 in)
1988-08-21
Record daily precipitation
Record daily precipitation 114.6 mm (4.5 in)
1990-12-23
Record low minimum temperature
Record low minimum temperature -17.8 C (0.0 F)
1994-06-28
Record high maximum temperature
Record high maximum temperature 44.4 C (111.9 F)
1995-07-28
Record high maximum temperature
Record high maximum temperature 45.0 C (113.0 F)
1997-08-01
Record high minimum temperature
Record high minimum temperature 28.3 C (82.9 F)
Wettest Day of Each Month
Aug: 114.6 mm (4.5 in)
The wettest day on record for each calendar month at Hillside 4 NNE. The most was 114.6 mm (4.5 in) on 21 August 1988.
Record daily precipitation for each month at Hillside 4 NNE
Month
Record daily precipitation (mm)
Date
Jan
44.5 mm (1.8 in)
13 January 1997
Feb
67.3 mm (2.6 in)
20 February 1993
Mar
71.1 mm (2.8 in)
1 March 1991
Apr
32.3 mm (1.3 in)
22 April 1988
May
35.6 mm (1.4 in)
11 May 1958
Jun
31.5 mm (1.2 in)
19 June 1967
Jul
47.8 mm (1.9 in)
20 July 1955
Aug
114.6 mm (4.5 in)
21 August 1988
Sep
68.6 mm (2.7 in)
26 September 1997
Oct
38.1 mm (1.5 in)
19 October 1972
Nov
82.6 mm (3.3 in)
11 November 1978
Dec
49.5 mm (1.9 in)
5 December 1966
Period of Record Coverage
1899 to 1997
Complete yearUnder 90 percent of days
44 years of record at Hillside 4 NNE, 1899 to 1997. 5 years have data for under 90 percent of days and are left out of rankings: 1899, 1963, 1964, 1965, 1987.
Cooler than the station meanWarmer than the station mean
One stripe for each of 37 complete years at Hillside 4 NNE, 1955 to 1995. Blue stripes are years cooler than the station's own mean of 14.9 C (58.9 F); red stripes are warmer. The coolest year was 1992, at 12.8 C (55.1 F), and the warmest was 1958, at 16.2 C (61.1 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Hillside 4 NNE as warming stripes, 1955 to 1995
Year
Annual mean temperature
Difference from the station mean
1955
14.6 C
-0.31 C
1956
15.7 C
+0.76 C
1957
15.9 C
+0.91 C
1958
16.2 C
+1.22 C
1959
16.1 C
+1.19 C
1960
15.5 C
+0.59 C
1961
15.4 C
+0.45 C
1962
15.8 C
+0.86 C
1964
14.5 C
-0.41 C
1966
15.3 C
+0.37 C
1967
14.9 C
-0.03 C
1968
14.7 C
-0.22 C
1969
15.3 C
+0.39 C
1970
14.6 C
-0.34 C
1971
14.2 C
-0.76 C
1972
15.1 C
+0.19 C
1974
14.9 C
-0.02 C
1975
14.4 C
-0.58 C
1976
14.9 C
-0.09 C
1977
15.3 C
+0.36 C
1978
15.1 C
+0.18 C
1979
14.1 C
-0.86 C
1980
15.1 C
+0.19 C
1981
16.1 C
+1.15 C
1982
14.6 C
-0.34 C
1983
14.8 C
-0.17 C
1984
15.0 C
+0.03 C
1985
14.8 C
-0.18 C
1986
14.8 C
-0.12 C
1988
14.6 C
-0.32 C
1989
14.7 C
-0.25 C
1990
14.4 C
-0.50 C
1991
14.3 C
-0.69 C
1992
12.8 C
-2.10 C
1993
13.8 C
-1.15 C
1994
15.1 C
+0.19 C
1995
15.4 C
+0.44 C
The annual mean temperature here has fallen by 0.3 C (0.1 to 0.5) per decade over 1955 to 1995. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hillside 4 NNE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.3 C (-0.5 to -0.1) per decade
-0.5 F (-0.8 to -0.2) per decade
1955 to 1995
37
Fall
Mean daily maximum
-0.1 C (-0.3 to 0.1) per decade
-0.2 F (-0.5 to 0.2) per decade
1955 to 1995
37
Not clearly different from zero
Mean daily minimum
-0.5 C (-0.7 to -0.2) per decade
-0.9 F (-1.3 to -0.4) per decade
1955 to 1995
37
Fall
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
1899 to 1997
Yearly extremes at Hillside 4 NNE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.0 C (113.0 F)
1995
41.1 C (106.0 F)
44
Coldest night (TNn)
-17.8 C (0.0 F)
1990
-11.7 C (10.9 F)
44
Wettest day (Rx1day)
114.6 mm (4.5 in)
1988
42.1 mm (1.7 in)
44
Wettest five days (Rx5day)
145.4 mm (5.7 in)
1988
65.1 mm (2.6 in)
43
Longest dry spell (CDD)
118 days
1960
62 days
44
Hottest day (TXx)
The hottest day of the year at Hillside 4 NNE, 1899 to 1997. The record is 45.0 C (113.0 F) in 1995, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Hillside 4 NNE by year
Year
Hottest day (TXx)
1899
16.1 C (61.0 F)
1955
40.6 C (105.1 F)
1956
40.6 C (105.1 F)
1957
41.1 C (106.0 F)
1958
41.7 C (107.1 F)
1959
40.6 C (105.1 F)
1960
41.1 C (106.0 F)
1961
41.1 C (106.0 F)
1962
40.6 C (105.1 F)
1963
41.7 C (107.1 F)
1964
40.0 C (104.0 F)
1965
36.7 C (98.1 F)
1966
41.7 C (107.1 F)
1967
40.0 C (104.0 F)
1968
43.9 C (111.0 F)
1969
41.1 C (106.0 F)
1970
43.9 C (111.0 F)
1971
43.9 C (111.0 F)
1972
42.8 C (109.0 F)
1973
42.8 C (109.0 F)
1974
42.8 C (109.0 F)
1975
40.6 C (105.1 F)
1976
41.7 C (107.1 F)
1977
42.2 C (108.0 F)
1978
41.1 C (106.0 F)
1979
41.1 C (106.0 F)
1980
41.7 C (107.1 F)
1981
43.3 C (109.9 F)
1982
40.6 C (105.1 F)
1983
41.7 C (107.1 F)
1984
42.2 C (108.0 F)
1985
42.2 C (108.0 F)
1986
40.6 C (105.1 F)
1987
39.4 C (102.9 F)
1988
40.6 C (105.1 F)
1989
40.0 C (104.0 F)
1990
43.3 C (109.9 F)
1991
40.0 C (104.0 F)
1992
36.1 C (97.0 F)
1993
40.6 C (105.1 F)
1994
44.4 C (111.9 F)
1995
45.0 C (113.0 F)
1996
41.7 C (107.1 F)
1997
41.7 C (107.1 F)
Coldest night (TNn)
The coldest night of the year at Hillside 4 NNE, 1899 to 1997. The record is -17.8 C (0.0 F) in 1990, marked on the chart; the median year is -11.7 C (10.9 F).
Coldest night (TNn) at Hillside 4 NNE by year
Year
Coldest night (TNn)
1899
1.7 C (35.1 F)
1955
-12.8 C (9.0 F)
1956
-9.4 C (15.1 F)
1957
-9.4 C (15.1 F)
1958
-9.4 C (15.1 F)
1959
-10.6 C (12.9 F)
1960
-12.8 C (9.0 F)
1961
-10.0 C (14.0 F)
1962
-14.4 C (6.1 F)
1963
-13.3 C (8.1 F)
1964
-13.9 C (7.0 F)
1965
-10.6 C (12.9 F)
1966
-16.1 C (3.0 F)
1967
-11.7 C (10.9 F)
1968
-14.4 C (6.1 F)
1969
-12.2 C (10.0 F)
1970
-14.4 C (6.1 F)
1971
-14.4 C (6.1 F)
1972
-12.8 C (9.0 F)
1973
-10.0 C (14.0 F)
1974
-12.8 C (9.0 F)
1975
-10.0 C (14.0 F)
1976
-13.3 C (8.1 F)
1977
-10.6 C (12.9 F)
1978
-12.2 C (10.0 F)
1979
-16.1 C (3.0 F)
1980
-8.9 C (16.0 F)
1981
-10.0 C (14.0 F)
1982
-9.4 C (15.1 F)
1983
-10.0 C (14.0 F)
1984
-11.1 C (12.0 F)
1985
-15.0 C (5.0 F)
1986
-9.4 C (15.1 F)
1987
-11.1 C (12.0 F)
1988
-11.7 C (10.9 F)
1989
-12.2 C (10.0 F)
1990
-17.8 C (0.0 F)
1991
-10.0 C (14.0 F)
1992
-13.3 C (8.1 F)
1993
-12.8 C (9.0 F)
1994
-10.6 C (12.9 F)
1995
-11.7 C (10.9 F)
1996
-11.1 C (12.0 F)
1997
-9.4 C (15.1 F)
Wettest day (Rx1day)
The wettest day of the year at Hillside 4 NNE, 1899 to 1997. The record is 114.6 mm (4.5 in) in 1988, marked on the chart; the median year is 42.1 mm (1.7 in).
Wettest day (Rx1day) at Hillside 4 NNE by year
Year
Wettest day (Rx1day)
1899
0.0 mm (0.00 in)
1955
47.8 mm (1.9 in)
1956
46.2 mm (1.8 in)
1957
31.8 mm (1.3 in)
1958
45.7 mm (1.8 in)
1959
52.8 mm (2.1 in)
1960
27.4 mm (1.1 in)
1961
42.7 mm (1.7 in)
1962
36.8 mm (1.4 in)
1963
36.8 mm (1.4 in)
1964
42.2 mm (1.7 in)
1965
48.3 mm (1.9 in)
1966
49.5 mm (1.9 in)
1967
46.5 mm (1.8 in)
1968
27.4 mm (1.1 in)
1969
29.5 mm (1.2 in)
1970
35.6 mm (1.4 in)
1971
44.7 mm (1.8 in)
1972
41.4 mm (1.6 in)
1973
29.0 mm (1.1 in)
1974
25.4 mm (1.0 in)
1975
38.1 mm (1.5 in)
1976
58.9 mm (2.3 in)
1977
35.1 mm (1.4 in)
1978
82.6 mm (3.3 in)
1979
37.3 mm (1.5 in)
1980
38.1 mm (1.5 in)
1981
52.1 mm (2.1 in)
1982
50.8 mm (2.0 in)
1983
49.5 mm (1.9 in)
1984
31.8 mm (1.3 in)
1985
45.7 mm (1.8 in)
1986
22.4 mm (0.9 in)
1987
45.7 mm (1.8 in)
1988
114.6 mm (4.5 in)
1989
36.8 mm (1.4 in)
1990
27.4 mm (1.1 in)
1991
71.1 mm (2.8 in)
1992
71.1 mm (2.8 in)
1993
67.3 mm (2.6 in)
1994
25.4 mm (1.0 in)
1995
41.9 mm (1.6 in)
1996
26.4 mm (1.0 in)
1997
68.6 mm (2.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hillside 4 NNE, 1899 to 1997. The record is 145.4 mm (5.7 in) in 1988, marked on the chart; the median year is 65.1 mm (2.6 in).
Wettest five days (Rx5day) at Hillside 4 NNE by year
Year
Wettest five days (Rx5day)
1899
n/a
1955
85.4 mm (3.4 in)
1956
51.5 mm (2.0 in)
1957
59.5 mm (2.3 in)
1958
49.5 mm (1.9 in)
1959
96.0 mm (3.8 in)
1960
46.5 mm (1.8 in)
1961
48.8 mm (1.9 in)
1962
47.0 mm (1.9 in)
1963
53.1 mm (2.1 in)
1964
80.0 mm (3.1 in)
1965
70.8 mm (2.8 in)
1966
98.3 mm (3.9 in)
1967
108.1 mm (4.3 in)
1968
52.0 mm (2.0 in)
1969
49.3 mm (1.9 in)
1970
92.2 mm (3.6 in)
1971
95.2 mm (3.7 in)
1972
94.0 mm (3.7 in)
1973
36.9 mm (1.5 in)
1974
48.5 mm (1.9 in)
1975
48.7 mm (1.9 in)
1976
87.1 mm (3.4 in)
1977
42.2 mm (1.7 in)
1978
116.2 mm (4.6 in)
1979
62.2 mm (2.4 in)
1980
105.1 mm (4.1 in)
1981
78.3 mm (3.1 in)
1982
65.1 mm (2.6 in)
1983
88.2 mm (3.5 in)
1984
57.2 mm (2.3 in)
1985
90.2 mm (3.6 in)
1986
48.0 mm (1.9 in)
1987
84.1 mm (3.3 in)
1988
145.4 mm (5.7 in)
1989
59.5 mm (2.3 in)
1990
53.6 mm (2.1 in)
1991
109.9 mm (4.3 in)
1992
91.4 mm (3.6 in)
1993
93.0 mm (3.7 in)
1994
38.6 mm (1.5 in)
1995
60.2 mm (2.4 in)
1996
32.3 mm (1.3 in)
1997
76.5 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hillside 4 NNE, 1899 to 1997. The record is 118 days in 1960, marked on the chart; the median year is 62 days.
Longest dry spell (CDD) at Hillside 4 NNE by year
Year
Longest dry spell (CDD)
1899
1 day
1955
81 days
1956
76 days
1957
44 days
1958
37 days
1959
63 days
1960
118 days
1961
51 days
1962
54 days
1963
59 days
1964
61 days
1965
48 days
1966
89 days
1967
62 days
1968
51 days
1969
71 days
1970
68 days
1971
54 days
1972
102 days
1973
92 days
1974
109 days
1975
48 days
1976
70 days
1977
48 days
1978
104 days
1979
42 days
1980
50 days
1981
55 days
1982
55 days
1983
89 days
1984
83 days
1985
55 days
1986
57 days
1987
42 days
1988
75 days
1989
68 days
1990
49 days
1991
64 days
1992
65 days
1993
59 days
1994
27 days
1995
86 days
1996
70 days
1997
71 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
37 years with a frost
Across 37 years with a frost, the median last spring frost at Hillside 4 NNE falls on 11 May and the median first autumn frost on 20 October, which leaves a median of 165 days between them.
Fitted over all years, the growing season changes by -11.6 days per decade at this station.
Frost dates and growing season at Hillside 4 NNE
Measure
Median, all years
Earliest period
Recent period (1962 to 1995)
Recent against earliest
Fitted trend
Last spring frost
11 May
n/a
13 May
n/a
+8.4 days per decade
First autumn frost
20 October
n/a
17 October
n/a
-3.2 days per decade
Growing days
165 days
n/a
159 days
n/a
-11.6 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
42 years, 1955 to 1997
A day with at least 40.5 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 110.5 mm (4.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Hillside 4 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
40.5 mm (1.6 in)
5 years
55.3 mm (2.2 in)
10 years
66.5 mm (2.6 in)
25 years
82.5 mm (3.2 in)
50 years
95.9 mm (3.8 in)
Longer than the 42 years of record
100 years
110.5 mm (4.4 in)
Longer than the 42 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, 42 years of values from 1955 to 1997.
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: 114.6 mm (4.5 in) in 1988; 82.6 mm (3.3 in) in 1978; 71.1 mm (2.8 in) in 1991.
Download the Data
Data for Hillside 4 NNE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hillside 4 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.