Record envelope, standing records and threshold days for Harper (USC00353666), Oregon, United States, with 57 years of record.
Key Facts for Harper
Harper (USC00353666) is a weather station in Oregon, United States at 43.87 latitude and -117.62 longitude, 766 m (2,513 ft) above sea level.
The station reports from 1919 to 1975, 57 years of record.
1,464 records set at Harper still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Harper set a daily record high minimum temperature of 19.4 C (66.9 F) on 20 July 1975.
About the Station
Location: Oregon, United States, 43.87 latitude, -117.62 longitude.
Elevation: 766 m (2,513 ft).
Period of record: 1919 to 1975, 57 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 Harper. 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 Harper, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.1 C (61.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Feb
20.6 C (69.1 F)
-35.6 C (-32.1 F)
n/a
n/a
Mar
28.3 C (82.9 F)
-16.1 C (3.0 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-11.7 C (10.9 F)
n/a
n/a
May
36.7 C (98.1 F)
-8.9 C (16.0 F)
n/a
n/a
Jun
40.6 C (105.1 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
43.9 C (111.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-14.4 C (6.1 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-13.3 C (8.1 F)
n/a
n/a
Nov
24.4 C (75.9 F)
-26.1 C (-15.0 F)
n/a
n/a
Dec
23.9 C (75.0 F)
-40.6 C (-41.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Harper still stand. 1929 holds the most, with 61.
Standing records at Harper by the year they were set
Year set
Standing records
1919
22
1920
48
1921
41
1922
48
1923
27
1924
31
1925
29
1926
52
1927
41
1928
31
1929
61
1930
44
1931
37
1932
33
1933
43
1934
45
1935
27
1936
29
1937
38
1938
27
1939
25
1940
31
1941
25
1942
23
1943
23
1944
12
1954
10
1955
48
1956
38
1957
32
1958
13
1959
31
1960
17
1961
19
1962
32
1963
28
1964
23
1965
28
1966
44
1967
20
1968
28
1969
22
1970
17
1971
27
1972
31
1973
21
1974
29
1975
13
All-Time Record Progression
3 new records
3 all-time records were set at Harper between 4 August 1961 and 6 August 1971. Each dot is a new record.
When Harper set new all-time records
Date
Kind
Detail
1961-08-04
Record high maximum temperature
Record high maximum temperature 43.9 C (111.0 F)
1966-07-31
Record high minimum temperature
Record high minimum temperature 22.2 C (72.0 F)
1971-08-06
Record high minimum temperature
Record high minimum temperature 22.8 C (73.0 F)
Wettest Day of Each Month
Feb: 50.8 mm (2.0 in)
The wettest day on record for each calendar month at Harper. The most was 50.8 mm (2.0 in) on 27 February 1924.
Record daily precipitation for each month at Harper
Month
Record daily precipitation (mm)
Date
Jan
20.3 mm (0.8 in)
6 January 1975
Feb
50.8 mm (2.0 in)
27 February 1924
Mar
18.0 mm (0.7 in)
14 March 1961
Apr
18.3 mm (0.7 in)
10 April 1967
May
33.8 mm (1.3 in)
28 May 1964
Jun
25.1 mm (1.0 in)
21 June 1944
Jul
14.2 mm (0.6 in)
4 July 1938
Aug
23.1 mm (0.9 in)
19 August 1972
Sep
27.9 mm (1.1 in)
4 September 1940
Oct
26.7 mm (1.1 in)
6 October 1925
Nov
21.8 mm (0.9 in)
19 November 1937
Dec
26.9 mm (1.1 in)
12 December 1973
Period of Record Coverage
1919 to 1975
Complete yearUnder 90 percent of days
48 years of record at Harper, 1919 to 1975. 9 years have data for under 90 percent of days and are left out of rankings: 1919, 1924, 1925, 1944, 1954, 1960, 1970, 1972 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 34 complete years at Harper, 1920 to 1974. Blue stripes are years cooler than the station's own mean of 9.4 C (48.9 F); red stripes are warmer. The coolest year was 1922, at 7.9 C (46.3 F), and the warmest was 1934, at 11.6 C (52.8 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Harper as warming stripes, 1920 to 1974
Year
Annual mean temperature
Difference from the station mean
1920
9.1 C
-0.23 C
1921
9.4 C
+0.03 C
1922
7.9 C
-1.43 C
1926
10.0 C
+0.63 C
1929
8.1 C
-1.24 C
1930
8.4 C
-0.93 C
1931
9.3 C
-0.03 C
1932
8.2 C
-1.13 C
1933
8.7 C
-0.64 C
1934
11.6 C
+2.20 C
1935
8.5 C
-0.83 C
1936
8.9 C
-0.52 C
1937
8.7 C
-0.64 C
1938
9.6 C
+0.27 C
1939
9.5 C
+0.16 C
1940
10.2 C
+0.87 C
1941
9.8 C
+0.46 C
1942
9.0 C
-0.42 C
1943
9.3 C
-0.11 C
1955
8.7 C
-0.70 C
1956
9.2 C
-0.22 C
1957
9.2 C
-0.20 C
1958
10.1 C
+0.72 C
1959
8.6 C
-0.76 C
1962
9.6 C
+0.24 C
1963
10.1 C
+0.73 C
1964
8.8 C
-0.58 C
1965
9.7 C
+0.36 C
1966
10.6 C
+1.19 C
1967
10.4 C
+1.01 C
1968
10.1 C
+0.74 C
1969
9.9 C
+0.50 C
1973
9.9 C
+0.50 C
1974
9.4 C
0.00 C
The annual mean temperature here has risen by 0.17 C (0.02 to 0.33) per decade over 1920 to 1974. In Fahrenheit: 0.31 F (0.03 to 0.59) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Harper
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.17 C (0.02 to 0.33) per decade
0.31 F (0.03 to 0.59) per decade
1920 to 1974
34
Rise
Mean daily maximum
0.1 C (-0.1 to 0.3) per decade
0.2 F (-0.2 to 0.5) per decade
1920 to 1974
34
Not clearly different from zero
Mean daily minimum
0.26 C (0.04 to 0.48) per decade
0.5 F (0.1 to 0.9) per decade
1920 to 1974
34
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
1919 to 1975
Yearly extremes at Harper: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.9 C (111.0 F)
1961
38.9 C (102.0 F)
48
Coldest night (TNn)
-40.6 C (-41.1 F)
1924
-22.5 C (-8.5 F)
48
Wettest day (Rx1day)
50.8 mm (2.0 in)
1924
17.7 mm (0.7 in)
48
Wettest five days (Rx5day)
50.8 mm (2.0 in)
1924
31.2 mm (1.2 in)
48
Longest dry spell (CDD)
128 days
1931
56 days
48
Hottest day (TXx)
The hottest day of the year at Harper, 1919 to 1975. The record is 43.9 C (111.0 F) in 1961, marked on the chart; the median year is 38.9 C (102.0 F).
Hottest day (TXx) at Harper by year
Year
Hottest day (TXx)
1919
22.2 C (72.0 F)
1920
40.6 C (105.1 F)
1921
40.0 C (104.0 F)
1922
39.4 C (102.9 F)
1923
37.8 C (100.0 F)
1924
41.1 C (106.0 F)
1925
41.7 C (107.1 F)
1926
40.6 C (105.1 F)
1927
37.8 C (100.0 F)
1928
40.0 C (104.0 F)
1929
41.1 C (106.0 F)
1930
40.0 C (104.0 F)
1931
40.0 C (104.0 F)
1932
38.9 C (102.0 F)
1933
39.4 C (102.9 F)
1934
41.1 C (106.0 F)
1935
39.4 C (102.9 F)
1936
38.9 C (102.0 F)
1937
38.3 C (100.9 F)
1938
37.2 C (99.0 F)
1939
38.9 C (102.0 F)
1940
38.9 C (102.0 F)
1941
36.1 C (97.0 F)
1942
37.8 C (100.0 F)
1943
37.2 C (99.0 F)
1944
36.7 C (98.1 F)
1954
37.8 C (100.0 F)
1955
39.4 C (102.9 F)
1956
40.6 C (105.1 F)
1957
38.3 C (100.9 F)
1958
37.2 C (99.0 F)
1959
38.3 C (100.9 F)
1960
38.9 C (102.0 F)
1961
43.9 C (111.0 F)
1962
38.3 C (100.9 F)
1963
36.7 C (98.1 F)
1964
38.9 C (102.0 F)
1965
37.2 C (99.0 F)
1966
38.9 C (102.0 F)
1967
39.4 C (102.9 F)
1968
38.9 C (102.0 F)
1969
38.3 C (100.9 F)
1970
37.8 C (100.0 F)
1971
40.0 C (104.0 F)
1972
37.2 C (99.0 F)
1973
38.3 C (100.9 F)
1974
38.3 C (100.9 F)
1975
37.8 C (100.0 F)
Coldest night (TNn)
The coldest night of the year at Harper, 1919 to 1975. The record is -40.6 C (-41.1 F) in 1924, marked on the chart; the median year is -22.5 C (-8.5 F).
Coldest night (TNn) at Harper by year
Year
Coldest night (TNn)
1919
-31.7 C (-25.1 F)
1920
-21.1 C (-6.0 F)
1921
-20.6 C (-5.1 F)
1922
-32.8 C (-27.0 F)
1923
-25.6 C (-14.1 F)
1924
-40.6 C (-41.1 F)
1925
-18.3 C (-0.9 F)
1926
-22.2 C (-8.0 F)
1927
-25.0 C (-13.0 F)
1928
-27.2 C (-17.0 F)
1929
-32.8 C (-27.0 F)
1930
-37.8 C (-36.0 F)
1931
-25.6 C (-14.1 F)
1932
-27.8 C (-18.0 F)
1933
-35.6 C (-32.1 F)
1934
-11.7 C (10.9 F)
1935
-21.7 C (-7.1 F)
1936
-25.6 C (-14.1 F)
1937
-32.2 C (-26.0 F)
1938
-17.2 C (1.0 F)
1939
-15.0 C (5.0 F)
1940
-19.4 C (-2.9 F)
1941
-13.9 C (7.0 F)
1942
-24.4 C (-11.9 F)
1943
-23.3 C (-9.9 F)
1944
-23.9 C (-11.0 F)
1954
-17.2 C (1.0 F)
1955
-26.1 C (-15.0 F)
1956
-30.6 C (-23.1 F)
1957
-32.2 C (-26.0 F)
1958
-16.7 C (1.9 F)
1959
-16.7 C (1.9 F)
1960
-17.2 C (1.0 F)
1961
-22.8 C (-9.0 F)
1962
-33.9 C (-29.0 F)
1963
-22.8 C (-9.0 F)
1964
-22.2 C (-8.0 F)
1965
-20.0 C (-4.0 F)
1966
-14.4 C (6.1 F)
1967
-22.2 C (-8.0 F)
1968
-16.7 C (1.9 F)
1969
-17.8 C (0.0 F)
1970
-18.9 C (-2.0 F)
1971
-17.8 C (0.0 F)
1972
-33.3 C (-27.9 F)
1973
-15.0 C (5.0 F)
1974
-28.3 C (-18.9 F)
1975
-20.6 C (-5.1 F)
Wettest day (Rx1day)
The wettest day of the year at Harper, 1919 to 1975. The record is 50.8 mm (2.0 in) in 1924, marked on the chart; the median year is 17.7 mm (0.7 in).
Wettest day (Rx1day) at Harper by year
Year
Wettest day (Rx1day)
1919
11.2 mm (0.4 in)
1920
16.3 mm (0.6 in)
1921
15.5 mm (0.6 in)
1922
11.9 mm (0.5 in)
1923
26.4 mm (1.0 in)
1924
50.8 mm (2.0 in)
1925
26.7 mm (1.1 in)
1926
17.0 mm (0.7 in)
1927
12.2 mm (0.5 in)
1928
15.5 mm (0.6 in)
1929
19.6 mm (0.8 in)
1930
31.0 mm (1.2 in)
1931
12.7 mm (0.5 in)
1932
25.4 mm (1.0 in)
1933
13.0 mm (0.5 in)
1934
16.0 mm (0.6 in)
1935
18.0 mm (0.7 in)
1936
15.0 mm (0.6 in)
1937
24.1 mm (0.9 in)
1938
14.2 mm (0.6 in)
1939
13.2 mm (0.5 in)
1940
27.9 mm (1.1 in)
1941
17.5 mm (0.7 in)
1942
17.3 mm (0.7 in)
1943
16.8 mm (0.7 in)
1944
25.1 mm (1.0 in)
1954
9.4 mm (0.37 in)
1955
16.5 mm (0.6 in)
1956
24.6 mm (1.0 in)
1957
27.9 mm (1.1 in)
1958
17.5 mm (0.7 in)
1959
18.8 mm (0.7 in)
1960
17.0 mm (0.7 in)
1961
21.8 mm (0.9 in)
1962
14.7 mm (0.6 in)
1963
17.8 mm (0.7 in)
1964
33.8 mm (1.3 in)
1965
22.9 mm (0.9 in)
1966
18.5 mm (0.7 in)
1967
22.1 mm (0.9 in)
1968
12.2 mm (0.5 in)
1969
23.1 mm (0.9 in)
1970
19.1 mm (0.8 in)
1971
11.9 mm (0.5 in)
1972
23.1 mm (0.9 in)
1973
26.9 mm (1.1 in)
1974
16.5 mm (0.6 in)
1975
20.3 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Harper, 1919 to 1975. The record is 50.8 mm (2.0 in) in 1924, marked on the chart; the median year is 31.2 mm (1.2 in).
Wettest five days (Rx5day) at Harper by year
Year
Wettest five days (Rx5day)
1919
16.7 mm (0.7 in)
1920
18.5 mm (0.7 in)
1921
41.9 mm (1.6 in)
1922
21.9 mm (0.9 in)
1923
41.1 mm (1.6 in)
1924
50.8 mm (2.0 in)
1925
31.7 mm (1.2 in)
1926
24.4 mm (1.0 in)
1927
25.2 mm (1.0 in)
1928
18.3 mm (0.7 in)
1929
34.3 mm (1.4 in)
1930
36.6 mm (1.4 in)
1931
16.0 mm (0.6 in)
1932
25.4 mm (1.0 in)
1933
19.3 mm (0.8 in)
1934
28.4 mm (1.1 in)
1935
23.6 mm (0.9 in)
1936
33.0 mm (1.3 in)
1937
44.6 mm (1.8 in)
1938
26.6 mm (1.0 in)
1939
16.7 mm (0.7 in)
1940
50.2 mm (2.0 in)
1941
29.2 mm (1.1 in)
1942
25.4 mm (1.0 in)
1943
31.5 mm (1.2 in)
1944
27.9 mm (1.1 in)
1954
9.4 mm (0.37 in)
1955
30.8 mm (1.2 in)
1956
45.5 mm (1.8 in)
1957
40.4 mm (1.6 in)
1958
36.8 mm (1.4 in)
1959
29.3 mm (1.2 in)
1960
33.5 mm (1.3 in)
1961
40.3 mm (1.6 in)
1962
45.6 mm (1.8 in)
1963
26.2 mm (1.0 in)
1964
40.0 mm (1.6 in)
1965
33.5 mm (1.3 in)
1966
24.2 mm (1.0 in)
1967
36.1 mm (1.4 in)
1968
25.7 mm (1.0 in)
1969
35.9 mm (1.4 in)
1970
34.6 mm (1.4 in)
1971
32.7 mm (1.3 in)
1972
24.2 mm (1.0 in)
1973
32.5 mm (1.3 in)
1974
26.9 mm (1.1 in)
1975
36.1 mm (1.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Harper, 1919 to 1975. The record is 128 days in 1931, marked on the chart; the median year is 56 days.
Longest dry spell (CDD) at Harper by year
Year
Longest dry spell (CDD)
1919
22 days
1920
52 days
1921
55 days
1922
61 days
1923
65 days
1924
70 days
1925
31 days
1926
41 days
1927
44 days
1928
94 days
1929
97 days
1930
65 days
1931
128 days
1932
84 days
1933
52 days
1934
70 days
1935
116 days
1936
93 days
1937
34 days
1938
64 days
1939
51 days
1940
48 days
1941
31 days
1942
61 days
1943
57 days
1944
39 days
1954
30 days
1955
62 days
1956
37 days
1957
69 days
1958
46 days
1959
75 days
1960
65 days
1961
41 days
1962
47 days
1963
51 days
1964
71 days
1965
46 days
1966
62 days
1967
81 days
1968
51 days
1969
83 days
1970
29 days
1971
67 days
1972
44 days
1973
54 days
1974
63 days
1975
50 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
34 years with a frost
Across 34 years with a frost, the median last spring frost at Harper falls on 22 May and the median first autumn frost on 17 September, which leaves a median of 116 days between them.
Fitted over all years, the growing season changes by -0.3 days per decade at this station.
Frost dates and growing season at Harper
Measure
Median, all years
Earliest period
Recent period (1929 to 1974)
Recent against earliest
Fitted trend
Last spring frost
22 May
n/a
20 May
n/a
+1.1 days per decade
First autumn frost
17 September
n/a
18 September
n/a
+0.8 days per decade
Growing days
116 days
n/a
120 days
n/a
-0.3 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
41 years, 1920 to 1974
A day with at least 18.2 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 48.6 mm (1.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Harper: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
18.2 mm (0.7 in)
5 years
24.3 mm (1.0 in)
10 years
29.1 mm (1.1 in)
25 years
36.0 mm (1.4 in)
50 years
41.9 mm (1.6 in)
Longer than the 41 years of record
100 years
48.6 mm (1.9 in)
Longer than the 41 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, 41 years of values from 1920 to 1974.
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: 50.8 mm (2.0 in) in 1924; 33.8 mm (1.3 in) in 1964; 31.0 mm (1.2 in) in 1930.
Download the Data
Data for Harper standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Harper 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.