Record envelope, standing records and threshold days for Yonna (USC00359604), Oregon, United States, with 45 years of record.
Key Facts for Yonna
Yonna (USC00359604) is a weather station in Oregon, United States at 42.30 latitude and -121.48 longitude, 1,275 m (4,183 ft) above sea level.
The station reports from 1905 to 1949, 45 years of record.
1,464 records set at Yonna still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Yonna set a daily record low minimum temperature of -22.8 C (-9.0 F) on 28 January 1949.
About the Station
Location: Oregon, United States, 42.30 latitude, -121.48 longitude.
Elevation: 1,275 m (4,183 ft).
Period of record: 1905 to 1949, 45 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 Yonna. 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 Yonna, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.7 C (62.1 F)
-34.4 C (-29.9 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Mar
24.4 C (75.9 F)
-30.6 C (-23.1 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-14.4 C (6.1 F)
n/a
n/a
May
36.7 C (98.1 F)
-10.0 C (14.0 F)
n/a
n/a
Jun
39.4 C (102.9 F)
-7.2 C (19.0 F)
n/a
n/a
Jul
39.4 C (102.9 F)
-5.0 C (23.0 F)
n/a
n/a
Aug
39.4 C (102.9 F)
-7.2 C (19.0 F)
n/a
n/a
Sep
35.6 C (96.1 F)
-12.2 C (10.0 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-15.0 C (5.0 F)
n/a
n/a
Nov
25.0 C (77.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-33.9 C (-29.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Yonna still stand. 1917 holds the most, with 87.
Standing records at Yonna by the year they were set
Year set
Standing records
1905
1
1906
23
1907
31
1908
47
1909
34
1910
34
1911
35
1912
47
1913
64
1914
38
1915
38
1916
65
1917
87
1918
38
1919
44
1920
47
1921
22
1922
32
1923
18
1924
19
1925
41
1926
43
1927
26
1928
29
1929
33
1930
25
1931
38
1932
42
1933
38
1934
39
1935
23
1936
15
1937
49
1938
39
1939
34
1940
38
1941
26
1942
18
1943
25
1944
11
1945
23
1946
8
1947
15
1948
14
1949
8
All-Time Record Progression
2 new records
2 all-time records were set at Yonna between 7 January 1937 and 9 December 1939. Each dot is a new record.
When Yonna set new all-time records
Date
Kind
Detail
1937-01-07
Record low maximum temperature
Record low maximum temperature -17.8 C (0.0 F)
1939-12-09
Record daily precipitation
Record daily precipitation 69.6 mm (2.7 in)
Wettest Day of Each Month
Dec: 69.6 mm (2.7 in)
The wettest day on record for each calendar month at Yonna. The most was 69.6 mm (2.7 in) on 9 December 1939.
Record daily precipitation for each month at Yonna
Month
Record daily precipitation (mm)
Date
Jan
24.9 mm (1.0 in)
5 January 1909
Feb
27.4 mm (1.1 in)
27 February 1940
Mar
43.2 mm (1.7 in)
26 March 1928
Apr
26.2 mm (1.0 in)
7 April 1935
May
40.6 mm (1.6 in)
19 May 1925
Jun
48.5 mm (1.9 in)
20 June 1928
Jul
27.9 mm (1.1 in)
6 July 1923
Aug
24.1 mm (0.9 in)
24 August 1907
Sep
20.3 mm (0.8 in)
18 September 1940
Oct
43.2 mm (1.7 in)
6 October 1925
Nov
44.2 mm (1.7 in)
24 November 1910
Dec
69.6 mm (2.7 in)
9 December 1939
Period of Record Coverage
1906 to 1949
Complete yearUnder 90 percent of days
44 years of record at Yonna, 1906 to 1949. 11 years have data for under 90 percent of days and are left out of rankings: 1915, 1918, 1923, 1924, 1936, 1944, 1945, 1946 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 29 complete years at Yonna, 1909 to 1943. Blue stripes are years cooler than the station's own mean of 7.6 C (45.8 F); red stripes are warmer. The coolest year was 1917, at 5.3 C (41.5 F), and the warmest was 1926, at 9.9 C (49.8 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Yonna as warming stripes, 1909 to 1943
Year
Annual mean temperature
Difference from the station mean
1909
7.2 C
-0.40 C
1910
7.4 C
-0.29 C
1912
6.5 C
-1.11 C
1913
5.4 C
-2.29 C
1914
6.8 C
-0.88 C
1916
5.6 C
-2.05 C
1917
5.3 C
-2.38 C
1919
6.4 C
-1.20 C
1920
6.7 C
-0.91 C
1921
7.0 C
-0.61 C
1922
5.4 C
-2.26 C
1925
9.1 C
+1.48 C
1926
9.9 C
+2.23 C
1927
8.2 C
+0.53 C
1928
8.8 C
+1.18 C
1929
8.7 C
+1.05 C
1930
8.5 C
+0.87 C
1931
9.4 C
+1.75 C
1932
8.0 C
+0.33 C
1933
8.0 C
+0.35 C
1934
9.7 C
+2.02 C
1935
7.5 C
-0.19 C
1937
6.0 C
-1.66 C
1938
6.7 C
-0.99 C
1939
8.0 C
+0.34 C
1940
9.8 C
+2.17 C
1941
9.0 C
+1.33 C
1942
8.3 C
+0.63 C
1943
8.6 C
+0.99 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 1949
Yearly extremes at Yonna: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
1925
36.7 C (98.1 F)
44
Coldest night (TNn)
-34.4 C (-29.9 F)
1917
-24.4 C (-11.9 F)
45
Wettest day (Rx1day)
69.6 mm (2.7 in)
1939
22.4 mm (0.9 in)
43
Wettest five days (Rx5day)
99.6 mm (3.9 in)
1939
45.5 mm (1.8 in)
43
Longest dry spell (CDD)
146 days
1926
48 days
43
Hottest day (TXx)
The hottest day of the year at Yonna, 1905 to 1949. The record is 39.4 C (102.9 F) in 1925, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Yonna by year
Year
Hottest day (TXx)
1905
n/a
1906
36.7 C (98.1 F)
1907
32.2 C (90.0 F)
1908
38.3 C (100.9 F)
1909
35.0 C (95.0 F)
1910
36.7 C (98.1 F)
1911
35.6 C (96.1 F)
1912
33.9 C (93.0 F)
1913
36.7 C (98.1 F)
1914
35.6 C (96.1 F)
1915
36.1 C (97.0 F)
1916
35.0 C (95.0 F)
1917
36.7 C (98.1 F)
1918
34.4 C (93.9 F)
1919
36.7 C (98.1 F)
1920
37.8 C (100.0 F)
1921
36.1 C (97.0 F)
1922
36.1 C (97.0 F)
1923
35.6 C (96.1 F)
1924
37.8 C (100.0 F)
1925
39.4 C (102.9 F)
1926
37.2 C (99.0 F)
1927
34.4 C (93.9 F)
1928
39.4 C (102.9 F)
1929
38.3 C (100.9 F)
1930
35.6 C (96.1 F)
1931
38.9 C (102.0 F)
1932
37.8 C (100.0 F)
1933
38.9 C (102.0 F)
1934
37.8 C (100.0 F)
1935
37.8 C (100.0 F)
1936
37.2 C (99.0 F)
1937
35.0 C (95.0 F)
1938
37.2 C (99.0 F)
1939
39.4 C (102.9 F)
1940
37.8 C (100.0 F)
1941
36.1 C (97.0 F)
1942
37.2 C (99.0 F)
1943
35.6 C (96.1 F)
1944
36.7 C (98.1 F)
1945
36.1 C (97.0 F)
1946
36.1 C (97.0 F)
1947
37.2 C (99.0 F)
1948
35.0 C (95.0 F)
1949
6.1 C (43.0 F)
Coldest night (TNn)
The coldest night of the year at Yonna, 1905 to 1949. The record is -34.4 C (-29.9 F) in 1917, marked on the chart; the median year is -24.4 C (-11.9 F).
Coldest night (TNn) at Yonna by year
Year
Coldest night (TNn)
1905
-22.2 C (-8.0 F)
1906
-26.7 C (-16.1 F)
1907
-23.3 C (-9.9 F)
1908
-27.8 C (-18.0 F)
1909
-23.3 C (-9.9 F)
1910
-24.4 C (-11.9 F)
1911
-27.8 C (-18.0 F)
1912
-31.7 C (-25.1 F)
1913
-27.8 C (-18.0 F)
1914
-26.7 C (-16.1 F)
1915
-18.9 C (-2.0 F)
1916
-26.1 C (-15.0 F)
1917
-34.4 C (-29.9 F)
1918
-27.2 C (-17.0 F)
1919
-33.9 C (-29.0 F)
1920
-23.9 C (-11.0 F)
1921
-25.0 C (-13.0 F)
1922
-32.8 C (-27.0 F)
1923
-30.0 C (-22.0 F)
1924
-25.0 C (-13.0 F)
1925
-12.8 C (9.0 F)
1926
-17.2 C (1.0 F)
1927
-17.2 C (1.0 F)
1928
-17.8 C (0.0 F)
1929
-19.4 C (-2.9 F)
1930
-25.6 C (-14.1 F)
1931
-20.6 C (-5.1 F)
1932
-26.7 C (-16.1 F)
1933
-26.7 C (-16.1 F)
1934
-13.9 C (7.0 F)
1935
-21.7 C (-7.1 F)
1936
-18.3 C (-0.9 F)
1937
-29.4 C (-20.9 F)
1938
-22.8 C (-9.0 F)
1939
-18.3 C (-0.9 F)
1940
-17.2 C (1.0 F)
1941
-12.8 C (9.0 F)
1942
-27.8 C (-18.0 F)
1943
-21.1 C (-6.0 F)
1944
-20.6 C (-5.1 F)
1945
-20.0 C (-4.0 F)
1946
-17.2 C (1.0 F)
1947
-28.3 C (-18.9 F)
1948
-29.4 C (-20.9 F)
1949
-34.4 C (-29.9 F)
Wettest day (Rx1day)
The wettest day of the year at Yonna, 1905 to 1949. The record is 69.6 mm (2.7 in) in 1939, marked on the chart; the median year is 22.4 mm (0.9 in).
Wettest day (Rx1day) at Yonna by year
Year
Wettest day (Rx1day)
1905
n/a
1906
n/a
1907
30.5 mm (1.2 in)
1908
35.1 mm (1.4 in)
1909
24.9 mm (1.0 in)
1910
44.2 mm (1.7 in)
1911
18.0 mm (0.7 in)
1912
21.1 mm (0.8 in)
1913
27.9 mm (1.1 in)
1914
30.5 mm (1.2 in)
1915
29.0 mm (1.1 in)
1916
13.2 mm (0.5 in)
1917
24.1 mm (0.9 in)
1918
15.0 mm (0.6 in)
1919
17.0 mm (0.7 in)
1920
19.3 mm (0.8 in)
1921
21.3 mm (0.8 in)
1922
15.2 mm (0.6 in)
1923
27.9 mm (1.1 in)
1924
40.6 mm (1.6 in)
1925
43.2 mm (1.7 in)
1926
41.7 mm (1.6 in)
1927
22.4 mm (0.9 in)
1928
48.5 mm (1.9 in)
1929
22.6 mm (0.9 in)
1930
15.2 mm (0.6 in)
1931
18.5 mm (0.7 in)
1932
20.3 mm (0.8 in)
1933
21.6 mm (0.9 in)
1934
15.7 mm (0.6 in)
1935
26.2 mm (1.0 in)
1936
22.4 mm (0.9 in)
1937
35.6 mm (1.4 in)
1938
16.5 mm (0.6 in)
1939
69.6 mm (2.7 in)
1940
28.7 mm (1.1 in)
1941
25.4 mm (1.0 in)
1942
20.3 mm (0.8 in)
1943
19.6 mm (0.8 in)
1944
21.3 mm (0.8 in)
1945
19.1 mm (0.8 in)
1946
21.6 mm (0.9 in)
1947
16.8 mm (0.7 in)
1948
40.9 mm (1.6 in)
1949
5.8 mm (0.23 in)
Wettest five days (Rx5day)
The wettest five days of the year at Yonna, 1905 to 1949. The record is 99.6 mm (3.9 in) in 1939, marked on the chart; the median year is 45.5 mm (1.8 in).
Wettest five days (Rx5day) at Yonna by year
Year
Wettest five days (Rx5day)
1905
n/a
1906
n/a
1907
45.5 mm (1.8 in)
1908
44.9 mm (1.8 in)
1909
75.4 mm (3.0 in)
1910
96.3 mm (3.8 in)
1911
22.9 mm (0.9 in)
1912
47.2 mm (1.9 in)
1913
53.4 mm (2.1 in)
1914
60.7 mm (2.4 in)
1915
44.4 mm (1.7 in)
1916
24.1 mm (0.9 in)
1917
44.4 mm (1.7 in)
1918
23.4 mm (0.9 in)
1919
29.9 mm (1.2 in)
1920
59.8 mm (2.4 in)
1921
33.6 mm (1.3 in)
1922
35.8 mm (1.4 in)
1923
27.9 mm (1.1 in)
1924
52.0 mm (2.0 in)
1925
52.0 mm (2.0 in)
1926
82.8 mm (3.3 in)
1927
47.9 mm (1.9 in)
1928
67.4 mm (2.7 in)
1929
48.1 mm (1.9 in)
1930
31.2 mm (1.2 in)
1931
28.5 mm (1.1 in)
1932
37.1 mm (1.5 in)
1933
47.5 mm (1.9 in)
1934
33.9 mm (1.3 in)
1935
27.9 mm (1.1 in)
1936
58.3 mm (2.3 in)
1937
74.5 mm (2.9 in)
1938
34.6 mm (1.4 in)
1939
99.6 mm (3.9 in)
1940
53.4 mm (2.1 in)
1941
60.9 mm (2.4 in)
1942
42.1 mm (1.7 in)
1943
54.6 mm (2.1 in)
1944
47.5 mm (1.9 in)
1945
42.8 mm (1.7 in)
1946
36.1 mm (1.4 in)
1947
22.1 mm (0.9 in)
1948
45.6 mm (1.8 in)
1949
5.8 mm (0.23 in)
Longest dry spell (CDD)
The longest dry spell of the year at Yonna, 1905 to 1949. The record is 146 days in 1926, marked on the chart; the median year is 48 days.
Longest dry spell (CDD) at Yonna by year
Year
Longest dry spell (CDD)
1905
n/a
1906
n/a
1907
15 days
1908
113 days
1909
28 days
1910
58 days
1911
51 days
1912
45 days
1913
28 days
1914
38 days
1915
51 days
1916
60 days
1917
40 days
1918
48 days
1919
67 days
1920
37 days
1921
74 days
1922
41 days
1923
56 days
1924
35 days
1925
57 days
1926
146 days
1927
62 days
1928
43 days
1929
112 days
1930
35 days
1931
70 days
1932
95 days
1933
32 days
1934
77 days
1935
50 days
1936
57 days
1937
54 days
1938
76 days
1939
51 days
1940
69 days
1941
23 days
1942
41 days
1943
24 days
1944
30 days
1945
39 days
1946
38 days
1947
48 days
1948
44 days
1949
30 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
29 years with a frost
Across 29 years with a frost, the median last spring frost at Yonna falls on 18 June and the median first autumn frost on 30 August, which leaves a median of 81 days between them.
Fitted over all years, the growing season changes by +31.1 days per decade at this station.
Frost dates and growing season at Yonna
Measure
Median, all years
Earliest period
Recent period (1909 to 1943)
Recent against earliest
Fitted trend
Last spring frost
18 June
n/a
18 June
n/a
-4.5 days per decade
First autumn frost
30 August
n/a
30 August
n/a
+26.6 days per decade
Growing days
81 days
n/a
81 days
n/a
+31.1 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
30 years, 1908 to 1943
A day with at least 22.4 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 83.5 mm (3.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Yonna: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
22.4 mm (0.9 in)
5 years
32.2 mm (1.3 in)
10 years
40.7 mm (1.6 in)
25 years
54.5 mm (2.1 in)
50 years
67.6 mm (2.7 in)
Longer than the 30 years of record
100 years
83.5 mm (3.3 in)
Longer than the 30 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, 30 years of values from 1908 to 1943.
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: 69.6 mm (2.7 in) in 1939; 48.5 mm (1.9 in) in 1928; 44.2 mm (1.7 in) in 1910.
Download the Data
Data for Yonna standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Yonna 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.