Record envelope, standing records and threshold days for Round Grove (USC00357354), Oregon, United States, with 79 years of record.
Key Facts for Round Grove
Round Grove (USC00357354) is a weather station in Oregon, United States at 42.34 latitude and -120.89 longitude, 1,490 m (4,888 ft) above sea level.
The station reports from 1920 to 1998, 79 years of record.
1,464 records set at Round Grove still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Round Grove set an all-time record low minimum temperature of -34.4 C (-29.9 F) on 21 December 1998.
About the Station
Location: Oregon, United States, 42.34 latitude, -120.89 longitude.
Elevation: 1,490 m (4,888 ft).
Period of record: 1920 to 1998, 79 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 Round Grove. 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 Round Grove, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.8 C (64.0 F)
-33.9 C (-29.0 F)
n/a
n/a
Feb
20.6 C (69.1 F)
-31.7 C (-25.1 F)
n/a
n/a
Mar
22.8 C (73.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Apr
27.2 C (81.0 F)
-17.8 C (0.0 F)
n/a
n/a
May
32.2 C (90.0 F)
-12.2 C (10.0 F)
n/a
n/a
Jun
37.8 C (100.0 F)
-8.9 C (16.0 F)
n/a
n/a
Jul
37.2 C (99.0 F)
-4.4 C (24.1 F)
n/a
n/a
Aug
38.3 C (100.9 F)
-5.6 C (21.9 F)
n/a
n/a
Sep
37.2 C (99.0 F)
-11.1 C (12.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-17.8 C (0.0 F)
n/a
n/a
Nov
25.0 C (77.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-34.4 C (-29.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Round Grove still stand. 1944 holds the most, with 43.
Standing records at Round Grove by the year they were set
Year set
Standing records
1920
19
1921
14
1922
42
1923
11
1924
39
1925
19
1926
2
1927
18
1928
21
1929
30
1930
19
1931
27
1932
10
1933
29
1934
36
1935
11
1936
20
1937
28
1938
18
1939
27
1940
18
1941
10
1942
16
1943
19
1944
43
1945
14
1946
6
1947
22
1948
24
1949
38
1950
42
1951
17
1952
25
1953
17
1954
27
1955
36
1956
22
1957
15
1958
17
1959
20
1960
20
1961
19
1962
22
1963
28
1964
16
1965
9
1966
23
1967
22
1968
20
1969
19
1970
21
1971
27
1972
33
1973
16
1974
19
1975
17
1976
21
1977
24
1978
19
1979
14
1980
21
1981
19
1982
15
1983
15
1984
17
1985
19
1986
31
1987
17
1998
13
All-Time Record Progression
7 new records
7 all-time records were set at Round Grove between 23 July 1959 and 21 December 1998. Each dot is a new record.
When Round Grove set new all-time records
Date
Kind
Detail
1959-07-23
Record high minimum temperature
Record high minimum temperature 16.7 C (62.1 F)
1962-01-21
Record low maximum temperature
Record low maximum temperature -14.4 C (6.1 F)
1962-10-10
Record daily precipitation
Record daily precipitation 55.4 mm (2.2 in)
1964-01-20
Record daily precipitation
Record daily precipitation 69.1 mm (2.7 in)
1964-01-20
Record daily snowfall
Record daily snowfall 48.3 cm (19.0 in)
1981-08-08
Record high maximum temperature
Record high maximum temperature 38.3 C (100.9 F)
1998-12-21
Record low minimum temperature
Record low minimum temperature -34.4 C (-29.9 F)
Wettest Day of Each Month
Jan: 69.1 mm (2.7 in)
The wettest day on record for each calendar month at Round Grove. The most was 69.1 mm (2.7 in) on 20 January 1964.
Record daily precipitation for each month at Round Grove
Month
Record daily precipitation (mm)
Date
Jan
69.1 mm (2.7 in)
20 January 1964
Feb
39.6 mm (1.6 in)
22 February 1956
Mar
36.1 mm (1.4 in)
13 March 1971
Apr
30.5 mm (1.2 in)
7 April 1935
May
46.2 mm (1.8 in)
20 May 1925
Jun
41.9 mm (1.6 in)
8 June 1931
Jul
27.7 mm (1.1 in)
6 July 1923
Aug
51.8 mm (2.0 in)
30 August 1984
Sep
34.0 mm (1.3 in)
8 September 1985
Oct
55.4 mm (2.2 in)
10 October 1962
Nov
37.1 mm (1.5 in)
24 November 1926
Dec
61.2 mm (2.4 in)
22 December 1964
Period of Record Coverage
1920 to 1998
Complete yearUnder 90 percent of days
70 years of record at Round Grove, 1920 to 1998. 17 years have data for under 90 percent of days and are left out of rankings: 1920, 1925, 1926, 1929, 1932, 1936, 1946, 1947 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 54 complete years at Round Grove, 1921 to 1984. Blue stripes are years cooler than the station's own mean of 6.6 C (43.8 F); red stripes are warmer. The coolest year was 1944, at 4.6 C (40.3 F), and the warmest was 1934, at 8.7 C (47.6 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Round Grove as warming stripes, 1921 to 1984
Year
Annual mean temperature
Difference from the station mean
1921
6.1 C
-0.51 C
1922
5.2 C
-1.33 C
1923
6.7 C
+0.09 C
1924
6.9 C
+0.34 C
1927
5.6 C
-0.99 C
1928
6.6 C
+0.01 C
1930
6.5 C
-0.10 C
1931
7.4 C
+0.80 C
1933
5.9 C
-0.63 C
1934
8.7 C
+2.10 C
1935
6.3 C
-0.26 C
1937
5.2 C
-1.39 C
1939
7.2 C
+0.58 C
1940
5.7 C
-0.87 C
1941
6.5 C
-0.06 C
1942
6.7 C
+0.16 C
1943
6.1 C
-0.45 C
1944
4.6 C
-1.97 C
1945
6.8 C
+0.20 C
1948
6.0 C
-0.54 C
1951
6.4 C
-0.21 C
1952
6.3 C
-0.32 C
1953
6.9 C
+0.32 C
1954
6.6 C
-0.02 C
1955
5.5 C
-1.07 C
1956
6.5 C
-0.11 C
1957
6.3 C
-0.23 C
1958
7.8 C
+1.26 C
1959
7.0 C
+0.45 C
1960
6.8 C
+0.26 C
1961
7.2 C
+0.60 C
1962
6.7 C
+0.17 C
1963
6.9 C
+0.37 C
1964
5.7 C
-0.86 C
1965
6.7 C
+0.14 C
1966
6.8 C
+0.22 C
1967
6.8 C
+0.18 C
1968
6.8 C
+0.26 C
1969
6.7 C
+0.09 C
1970
6.7 C
+0.12 C
1971
5.7 C
-0.90 C
1972
6.5 C
-0.05 C
1973
7.1 C
+0.56 C
1974
6.7 C
+0.11 C
1975
5.9 C
-0.71 C
1976
6.9 C
+0.34 C
1977
7.3 C
+0.68 C
1978
7.2 C
+0.66 C
1979
7.3 C
+0.76 C
1980
7.6 C
+1.02 C
1981
7.8 C
+1.24 C
1982
5.7 C
-0.86 C
1983
6.9 C
+0.36 C
1984
6.7 C
+0.15 C
The annual mean temperature here has risen by 0.11 C (0.00 to 0.21) per decade over 1921 to 1984. In Fahrenheit: 0.19 F (0.01 to 0.38) per decade. The slope is a straight line fitted to 54 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Round Grove
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.11 C (0.00 to 0.21) per decade
0.19 F (0.01 to 0.38) per decade
1921 to 1984
54
Rise
Mean daily maximum
0.00 C (-0.14 to 0.13) per decade
-0.01 F (-0.25 to 0.24) per decade
1921 to 1984
54
Not clearly different from zero
Mean daily minimum
0.2 C (0.1 to 0.3) per decade
0.4 F (0.2 to 0.6) per decade
1921 to 1984
54
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
1920 to 1998
Yearly extremes at Round Grove: 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)
1981
34.4 C (93.9 F)
70
Coldest night (TNn)
-34.4 C (-29.9 F)
1998
-22.2 C (-8.0 F)
70
Wettest day (Rx1day)
69.1 mm (2.7 in)
1964
30.6 mm (1.2 in)
70
Wettest five days (Rx5day)
163.0 mm (6.4 in)
1964
53.3 mm (2.1 in)
70
Longest dry spell (CDD)
91 days
1936
42 days
70
Hottest day (TXx)
The hottest day of the year at Round Grove, 1920 to 1998. The record is 38.3 C (100.9 F) in 1981, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Round Grove by year
Year
Hottest day (TXx)
1920
32.8 C (91.0 F)
1921
32.2 C (90.0 F)
1922
37.8 C (100.0 F)
1923
35.0 C (95.0 F)
1924
36.7 C (98.1 F)
1925
35.6 C (96.1 F)
1926
16.7 C (62.1 F)
1927
33.3 C (91.9 F)
1928
37.2 C (99.0 F)
1929
31.7 C (89.1 F)
1930
33.9 C (93.0 F)
1931
36.7 C (98.1 F)
1932
33.9 C (93.0 F)
1933
36.1 C (97.0 F)
1934
35.6 C (96.1 F)
1935
35.0 C (95.0 F)
1936
33.3 C (91.9 F)
1937
34.4 C (93.9 F)
1938
35.6 C (96.1 F)
1939
37.2 C (99.0 F)
1940
36.7 C (98.1 F)
1941
32.8 C (91.0 F)
1942
35.6 C (96.1 F)
1943
33.3 C (91.9 F)
1944
34.4 C (93.9 F)
1945
36.7 C (98.1 F)
1946
37.2 C (99.0 F)
1947
32.2 C (90.0 F)
1948
33.3 C (91.9 F)
1949
33.9 C (93.0 F)
1950
35.6 C (96.1 F)
1951
33.3 C (91.9 F)
1952
32.2 C (90.0 F)
1953
33.3 C (91.9 F)
1954
35.0 C (95.0 F)
1955
37.2 C (99.0 F)
1956
32.2 C (90.0 F)
1957
33.3 C (91.9 F)
1958
33.3 C (91.9 F)
1959
36.7 C (98.1 F)
1960
37.2 C (99.0 F)
1961
37.8 C (100.0 F)
1962
33.9 C (93.0 F)
1963
32.8 C (91.0 F)
1964
33.3 C (91.9 F)
1965
33.3 C (91.9 F)
1966
34.4 C (93.9 F)
1967
34.4 C (93.9 F)
1968
36.7 C (98.1 F)
1969
33.9 C (93.0 F)
1970
35.0 C (95.0 F)
1971
35.0 C (95.0 F)
1972
37.2 C (99.0 F)
1973
34.4 C (93.9 F)
1974
34.4 C (93.9 F)
1975
36.1 C (97.0 F)
1976
32.2 C (90.0 F)
1977
36.7 C (98.1 F)
1978
36.7 C (98.1 F)
1979
35.6 C (96.1 F)
1980
36.1 C (97.0 F)
1981
38.3 C (100.9 F)
1982
33.3 C (91.9 F)
1983
35.0 C (95.0 F)
1984
34.4 C (93.9 F)
1985
33.9 C (93.0 F)
1986
32.2 C (90.0 F)
1987
32.8 C (91.0 F)
1997
8.9 C (48.0 F)
1998
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at Round Grove, 1920 to 1998. The record is -34.4 C (-29.9 F) in 1998, marked on the chart; the median year is -22.2 C (-8.0 F).
Coldest night (TNn) at Round Grove by year
Year
Coldest night (TNn)
1920
-16.1 C (3.0 F)
1921
-21.1 C (-6.0 F)
1922
-30.0 C (-22.0 F)
1923
-25.6 C (-14.1 F)
1924
-28.9 C (-20.0 F)
1925
-16.7 C (1.9 F)
1926
-17.8 C (0.0 F)
1927
-17.8 C (0.0 F)
1928
-17.8 C (0.0 F)
1929
-26.7 C (-16.1 F)
1930
-26.1 C (-15.0 F)
1931
-19.4 C (-2.9 F)
1932
-24.4 C (-11.9 F)
1933
-31.7 C (-25.1 F)
1934
-14.4 C (6.1 F)
1935
-25.0 C (-13.0 F)
1936
-21.7 C (-7.1 F)
1937
-33.9 C (-29.0 F)
1938
-22.2 C (-8.0 F)
1939
-22.2 C (-8.0 F)
1940
-21.7 C (-7.1 F)
1941
-18.3 C (-0.9 F)
1942
-30.6 C (-23.1 F)
1943
-20.6 C (-5.1 F)
1944
-21.7 C (-7.1 F)
1945
-20.0 C (-4.0 F)
1946
-20.0 C (-4.0 F)
1947
-16.7 C (1.9 F)
1948
-23.9 C (-11.0 F)
1949
-30.0 C (-22.0 F)
1950
-30.0 C (-22.0 F)
1951
-25.0 C (-13.0 F)
1952
-22.2 C (-8.0 F)
1953
-15.6 C (3.9 F)
1954
-22.2 C (-8.0 F)
1955
-26.1 C (-15.0 F)
1956
-25.0 C (-13.0 F)
1957
-28.9 C (-20.0 F)
1958
-15.6 C (3.9 F)
1959
-18.9 C (-2.0 F)
1960
-21.1 C (-6.0 F)
1961
-20.0 C (-4.0 F)
1962
-28.9 C (-20.0 F)
1963
-24.4 C (-11.9 F)
1964
-23.3 C (-9.9 F)
1965
-21.7 C (-7.1 F)
1966
-18.9 C (-2.0 F)
1967
-25.0 C (-13.0 F)
1968
-21.7 C (-7.1 F)
1969
-23.3 C (-9.9 F)
1970
-25.0 C (-13.0 F)
1971
-25.0 C (-13.0 F)
1972
-32.8 C (-27.0 F)
1973
-19.4 C (-2.9 F)
1974
-22.2 C (-8.0 F)
1975
-21.7 C (-7.1 F)
1976
-21.1 C (-6.0 F)
1977
-23.9 C (-11.0 F)
1978
-23.3 C (-9.9 F)
1979
-23.9 C (-11.0 F)
1980
-20.6 C (-5.1 F)
1981
-17.8 C (0.0 F)
1982
-24.4 C (-11.9 F)
1983
-26.1 C (-15.0 F)
1984
-22.8 C (-9.0 F)
1985
-28.3 C (-18.9 F)
1986
-12.2 C (10.0 F)
1987
-22.8 C (-9.0 F)
1997
-12.8 C (9.0 F)
1998
-34.4 C (-29.9 F)
Wettest day (Rx1day)
The wettest day of the year at Round Grove, 1920 to 1998. The record is 69.1 mm (2.7 in) in 1964, marked on the chart; the median year is 30.6 mm (1.2 in).
Wettest day (Rx1day) at Round Grove by year
Year
Wettest day (Rx1day)
1920
32.3 mm (1.3 in)
1921
21.3 mm (0.8 in)
1922
15.7 mm (0.6 in)
1923
27.7 mm (1.1 in)
1924
36.8 mm (1.4 in)
1925
46.2 mm (1.8 in)
1926
37.1 mm (1.5 in)
1927
26.7 mm (1.1 in)
1928
30.7 mm (1.2 in)
1929
25.4 mm (1.0 in)
1930
22.9 mm (0.9 in)
1931
41.9 mm (1.6 in)
1932
34.3 mm (1.4 in)
1933
27.4 mm (1.1 in)
1934
15.7 mm (0.6 in)
1935
30.5 mm (1.2 in)
1936
27.9 mm (1.1 in)
1937
50.3 mm (2.0 in)
1938
17.3 mm (0.7 in)
1939
48.5 mm (1.9 in)
1940
27.4 mm (1.1 in)
1941
24.1 mm (0.9 in)
1942
23.6 mm (0.9 in)
1943
44.5 mm (1.8 in)
1944
31.5 mm (1.2 in)
1945
31.2 mm (1.2 in)
1946
25.4 mm (1.0 in)
1947
15.7 mm (0.6 in)
1948
35.6 mm (1.4 in)
1949
32.5 mm (1.3 in)
1950
45.7 mm (1.8 in)
1951
35.6 mm (1.4 in)
1952
25.9 mm (1.0 in)
1953
25.4 mm (1.0 in)
1954
20.8 mm (0.8 in)
1955
32.3 mm (1.3 in)
1956
39.6 mm (1.6 in)
1957
32.0 mm (1.3 in)
1958
36.8 mm (1.4 in)
1959
29.5 mm (1.2 in)
1960
35.6 mm (1.4 in)
1961
29.5 mm (1.2 in)
1962
55.4 mm (2.2 in)
1963
21.3 mm (0.8 in)
1964
69.1 mm (2.7 in)
1965
33.0 mm (1.3 in)
1966
25.9 mm (1.0 in)
1967
37.6 mm (1.5 in)
1968
27.9 mm (1.1 in)
1969
36.8 mm (1.4 in)
1970
30.7 mm (1.2 in)
1971
36.1 mm (1.4 in)
1972
39.6 mm (1.6 in)
1973
19.6 mm (0.8 in)
1974
30.5 mm (1.2 in)
1975
21.8 mm (0.9 in)
1976
41.7 mm (1.6 in)
1977
32.8 mm (1.3 in)
1978
20.3 mm (0.8 in)
1979
23.1 mm (0.9 in)
1980
28.4 mm (1.1 in)
1981
36.6 mm (1.4 in)
1982
36.6 mm (1.4 in)
1983
20.3 mm (0.8 in)
1984
51.8 mm (2.0 in)
1985
34.0 mm (1.3 in)
1986
23.4 mm (0.9 in)
1987
18.3 mm (0.7 in)
1997
5.3 mm (0.21 in)
1998
30.5 mm (1.2 in)
Wettest five days (Rx5day)
The wettest five days of the year at Round Grove, 1920 to 1998. The record is 163.0 mm (6.4 in) in 1964, marked on the chart; the median year is 53.3 mm (2.1 in).
Wettest five days (Rx5day) at Round Grove by year
Year
Wettest five days (Rx5day)
1920
64.1 mm (2.5 in)
1921
30.3 mm (1.2 in)
1922
38.0 mm (1.5 in)
1923
36.3 mm (1.4 in)
1924
49.0 mm (1.9 in)
1925
51.3 mm (2.0 in)
1926
66.3 mm (2.6 in)
1927
64.8 mm (2.6 in)
1928
56.4 mm (2.2 in)
1929
69.8 mm (2.7 in)
1930
23.7 mm (0.9 in)
1931
54.6 mm (2.1 in)
1932
39.9 mm (1.6 in)
1933
60.6 mm (2.4 in)
1934
29.3 mm (1.2 in)
1935
49.5 mm (1.9 in)
1936
57.5 mm (2.3 in)
1937
83.6 mm (3.3 in)
1938
41.9 mm (1.6 in)
1939
69.1 mm (2.7 in)
1940
69.6 mm (2.7 in)
1941
47.7 mm (1.9 in)
1942
53.6 mm (2.1 in)
1943
45.5 mm (1.8 in)
1944
53.3 mm (2.1 in)
1945
53.6 mm (2.1 in)
1946
43.2 mm (1.7 in)
1947
38.1 mm (1.5 in)
1948
42.7 mm (1.7 in)
1949
52.2 mm (2.1 in)
1950
106.5 mm (4.2 in)
1951
59.3 mm (2.3 in)
1952
44.7 mm (1.8 in)
1953
42.4 mm (1.7 in)
1954
46.5 mm (1.8 in)
1955
119.6 mm (4.7 in)
1956
68.1 mm (2.7 in)
1957
81.1 mm (3.2 in)
1958
41.7 mm (1.6 in)
1959
38.4 mm (1.5 in)
1960
55.7 mm (2.2 in)
1961
47.2 mm (1.9 in)
1962
161.4 mm (6.4 in)
1963
47.2 mm (1.9 in)
1964
163.0 mm (6.4 in)
1965
50.8 mm (2.0 in)
1966
50.1 mm (2.0 in)
1967
59.7 mm (2.4 in)
1968
61.4 mm (2.4 in)
1969
81.0 mm (3.2 in)
1970
70.8 mm (2.8 in)
1971
53.2 mm (2.1 in)
1972
59.9 mm (2.4 in)
1973
61.8 mm (2.4 in)
1974
62.8 mm (2.5 in)
1975
48.5 mm (1.9 in)
1976
60.4 mm (2.4 in)
1977
50.5 mm (2.0 in)
1978
42.7 mm (1.7 in)
1979
43.7 mm (1.7 in)
1980
52.2 mm (2.1 in)
1981
99.6 mm (3.9 in)
1982
66.2 mm (2.6 in)
1983
44.2 mm (1.7 in)
1984
53.3 mm (2.1 in)
1985
40.9 mm (1.6 in)
1986
70.6 mm (2.8 in)
1987
35.0 mm (1.4 in)
1997
7.6 mm (0.30 in)
1998
101.8 mm (4.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Round Grove, 1920 to 1998. The record is 91 days in 1936, marked on the chart; the median year is 42 days.
Longest dry spell (CDD) at Round Grove by year
Year
Longest dry spell (CDD)
1920
39 days
1921
36 days
1922
39 days
1923
44 days
1924
48 days
1925
27 days
1926
11 days
1927
28 days
1928
39 days
1929
27 days
1930
30 days
1931
59 days
1932
18 days
1933
44 days
1934
61 days
1935
54 days
1936
91 days
1937
36 days
1938
54 days
1939
28 days
1940
53 days
1941
30 days
1942
51 days
1943
40 days
1944
54 days
1945
70 days
1946
38 days
1947
40 days
1948
33 days
1949
32 days
1950
38 days
1951
83 days
1952
36 days
1953
72 days
1954
70 days
1955
66 days
1956
48 days
1957
28 days
1958
23 days
1959
51 days
1960
32 days
1961
54 days
1962
49 days
1963
29 days
1964
52 days
1965
41 days
1966
47 days
1967
64 days
1968
41 days
1969
74 days
1970
67 days
1971
27 days
1972
81 days
1973
68 days
1974
82 days
1975
46 days
1976
43 days
1977
37 days
1978
62 days
1979
56 days
1980
40 days
1981
81 days
1982
56 days
1983
36 days
1984
35 days
1985
53 days
1986
26 days
1987
18 days
1997
10 days
1998
27 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
54 years with a frost
Across 54 years with a frost, the median last spring frost at Round Grove falls on 27 June and the median first autumn frost on 11 July, which leaves a median of 18 days between them.
Fitted over all years, the growing season changes by 0.0 days per decade at this station.
Frost dates and growing season at Round Grove
Measure
Median, all years
Earliest period
Recent period (1955 to 1984)
Recent against earliest
Fitted trend
Last spring frost
27 June
n/a
27 June
n/a
-0.4 days per decade
First autumn frost
11 July
n/a
12 July
n/a
-0.5 days per decade
Growing days
18 days
n/a
19 days
n/a
0.0 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
59 years, 1921 to 1985
A day with at least 30.9 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 63.3 mm (2.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Round Grove: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
30.9 mm (1.2 in)
5 years
40.1 mm (1.6 in)
10 years
46.0 mm (1.8 in)
25 years
53.2 mm (2.1 in)
50 years
58.3 mm (2.3 in)
100 years
63.3 mm (2.5 in)
Longer than the 59 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, 59 years of values from 1921 to 1985.
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: 69.1 mm (2.7 in) in 1964; 55.4 mm (2.2 in) in 1962; 51.8 mm (2.0 in) in 1984.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Round Grove standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Round Grove 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.