Record envelope, standing records and threshold days for Rock Island (USC00457105), Washington, United States, with 34 years of record.
Key Facts for Rock Island
Rock Island (USC00457105) is a weather station in Washington, United States at 47.38 latitude and -120.15 longitude, 198 m (650 ft) above sea level.
The station reports from 1913 to 1946, 34 years of record.
1,464 records set at Rock Island still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Rock Island tied a monthly record daily precipitation of 19.1 mm (0.8 in) on 22 November 1946.
About the Station
Location: Washington, United States, 47.38 latitude, -120.15 longitude.
Elevation: 198 m (650 ft).
Period of record: 1913 to 1946, 34 years.
Eligible elements: tmax, tmin, prcp.
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 Rock Island. 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 Rock Island, 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)
-32.2 C (-26.0 F)
n/a
n/a
Feb
17.2 C (63.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Mar
27.2 C (81.0 F)
-17.8 C (0.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-6.7 C (19.9 F)
n/a
n/a
May
39.4 C (102.9 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
41.7 C (107.1 F)
1.7 C (35.1 F)
n/a
n/a
Jul
46.1 C (115.0 F)
5.6 C (42.1 F)
n/a
n/a
Aug
44.4 C (111.9 F)
2.8 C (37.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
22.8 C (73.0 F)
-16.1 C (3.0 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-31.1 C (-24.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Rock Island still stand. 1923 holds the most, with 78.
Standing records at Rock Island by the year they were set
Year set
Standing records
1913
18
1914
32
1915
27
1916
77
1917
47
1918
10
1919
50
1920
43
1921
33
1922
53
1923
78
1924
70
1925
55
1926
55
1927
36
1928
25
1929
55
1930
44
1931
30
1932
49
1933
48
1934
68
1935
50
1936
57
1937
52
1938
26
1939
40
1940
42
1941
34
1942
32
1943
50
1944
22
1945
32
1946
24
Wettest Day of Each Month
Jun: 52.1 mm (2.1 in)
The wettest day on record for each calendar month at Rock Island. The most was 52.1 mm (2.1 in) on 7 June 1936.
Record daily precipitation for each month at Rock Island
Month
Record daily precipitation (mm)
Date
Jan
19.6 mm (0.8 in)
27 January 1937
Feb
34.8 mm (1.4 in)
2 February 1916
Mar
24.4 mm (1.0 in)
22 March 1937
Apr
29.5 mm (1.2 in)
14 April 1917
May
34.3 mm (1.4 in)
7 May 1925
Jun
52.1 mm (2.1 in)
7 June 1936
Jul
45.7 mm (1.8 in)
30 July 1915
Aug
21.8 mm (0.9 in)
16 August 1924
Sep
21.6 mm (0.9 in)
5 September 1925
Oct
34.8 mm (1.4 in)
18 October 1920
Nov
19.1 mm (0.8 in)
2 November 1942
Dec
38.1 mm (1.5 in)
22 December 1917
Period of Record Coverage
1913 to 1946
Complete yearUnder 90 percent of days
34 years of record at Rock Island, 1913 to 1946. 3 years have data for under 90 percent of days and are left out of rankings: 1913, 1918, 1919.
Cooler than the station meanWarmer than the station mean
One stripe for each of 28 complete years at Rock Island, 1914 to 1945. Blue stripes are years cooler than the station's own mean of 10.9 C (51.5 F); red stripes are warmer. The coolest year was 1916, at 8.7 C (47.6 F), and the warmest was 1934, at 12.6 C (54.6 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Rock Island as warming stripes, 1914 to 1945
Year
Annual mean temperature
Difference from the station mean
1914
10.6 C
-0.21 C
1915
10.9 C
+0.02 C
1916
8.7 C
-2.16 C
1921
10.5 C
-0.34 C
1922
9.6 C
-1.26 C
1923
11.7 C
+0.80 C
1924
11.0 C
+0.14 C
1925
11.7 C
+0.83 C
1926
11.6 C
+0.76 C
1927
9.9 C
-1.00 C
1928
11.0 C
+0.16 C
1929
9.3 C
-1.51 C
1930
10.3 C
-0.57 C
1931
10.6 C
-0.28 C
1932
10.0 C
-0.84 C
1933
10.4 C
-0.42 C
1934
12.6 C
+1.72 C
1935
10.3 C
-0.52 C
1936
10.3 C
-0.54 C
1937
9.8 C
-1.05 C
1938
11.6 C
+0.71 C
1939
12.0 C
+1.12 C
1940
12.4 C
+1.51 C
1941
12.1 C
+1.21 C
1942
11.2 C
+0.38 C
1943
10.9 C
0.00 C
1944
11.6 C
+0.71 C
1945
11.5 C
+0.68 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
1913 to 1946
Yearly extremes at Rock Island: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
46.1 C (115.0 F)
1939
41.1 C (106.0 F)
34
Coldest night (TNn)
-32.2 C (-26.0 F)
1937
-17.8 C (0.0 F)
34
Wettest day (Rx1day)
52.1 mm (2.1 in)
1936
19.1 mm (0.8 in)
34
Wettest five days (Rx5day)
72.7 mm (2.9 in)
1936
29.6 mm (1.2 in)
34
Longest dry spell (CDD)
107 days
1924
59 days
34
Hottest day (TXx)
The hottest day of the year at Rock Island, 1913 to 1946. The record is 46.1 C (115.0 F) in 1939, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Rock Island by year
Year
Hottest day (TXx)
1913
40.6 C (105.1 F)
1914
40.0 C (104.0 F)
1915
40.0 C (104.0 F)
1916
39.4 C (102.9 F)
1917
42.8 C (109.0 F)
1918
22.2 C (72.0 F)
1919
34.4 C (93.9 F)
1920
41.7 C (107.1 F)
1921
39.4 C (102.9 F)
1922
41.1 C (106.0 F)
1923
40.6 C (105.1 F)
1924
43.3 C (109.9 F)
1925
41.7 C (107.1 F)
1926
41.1 C (106.0 F)
1927
38.9 C (102.0 F)
1928
41.7 C (107.1 F)
1929
41.1 C (106.0 F)
1930
40.6 C (105.1 F)
1931
40.6 C (105.1 F)
1932
40.6 C (105.1 F)
1933
41.1 C (106.0 F)
1934
43.3 C (109.9 F)
1935
41.7 C (107.1 F)
1936
42.2 C (108.0 F)
1937
40.0 C (104.0 F)
1938
43.3 C (109.9 F)
1939
46.1 C (115.0 F)
1940
40.6 C (105.1 F)
1941
43.9 C (111.0 F)
1942
41.7 C (107.1 F)
1943
38.9 C (102.0 F)
1944
41.1 C (106.0 F)
1945
40.0 C (104.0 F)
1946
44.4 C (111.9 F)
Coldest night (TNn)
The coldest night of the year at Rock Island, 1913 to 1946. The record is -32.2 C (-26.0 F) in 1937, marked on the chart; the median year is -17.8 C (0.0 F).
Coldest night (TNn) at Rock Island by year
Year
Coldest night (TNn)
1913
-5.6 C (21.9 F)
1914
-17.2 C (1.0 F)
1915
-17.8 C (0.0 F)
1916
-23.9 C (-11.0 F)
1917
-19.4 C (-2.9 F)
1918
-15.6 C (3.9 F)
1919
-31.1 C (-24.0 F)
1920
-15.6 C (3.9 F)
1921
-18.9 C (-2.0 F)
1922
-26.7 C (-16.1 F)
1923
-18.9 C (-2.0 F)
1924
-24.4 C (-11.9 F)
1925
-15.0 C (5.0 F)
1926
-17.8 C (0.0 F)
1927
-26.7 C (-16.1 F)
1928
-14.4 C (6.1 F)
1929
-28.9 C (-20.0 F)
1930
-27.8 C (-18.0 F)
1931
-17.8 C (0.0 F)
1932
-23.3 C (-9.9 F)
1933
-26.1 C (-15.0 F)
1934
-10.0 C (14.0 F)
1935
-24.4 C (-11.9 F)
1936
-23.3 C (-9.9 F)
1937
-32.2 C (-26.0 F)
1938
-12.8 C (9.0 F)
1939
-17.8 C (0.0 F)
1940
-12.2 C (10.0 F)
1941
-8.9 C (16.0 F)
1942
-17.2 C (1.0 F)
1943
-26.1 C (-15.0 F)
1944
-13.9 C (7.0 F)
1945
-11.1 C (12.0 F)
1946
-13.9 C (7.0 F)
Wettest day (Rx1day)
The wettest day of the year at Rock Island, 1913 to 1946. The record is 52.1 mm (2.1 in) in 1936, marked on the chart; the median year is 19.1 mm (0.8 in).
Wettest day (Rx1day) at Rock Island by year
Year
Wettest day (Rx1day)
1913
26.2 mm (1.0 in)
1914
21.3 mm (0.8 in)
1915
45.7 mm (1.8 in)
1916
34.8 mm (1.4 in)
1917
38.1 mm (1.5 in)
1918
11.4 mm (0.4 in)
1919
19.1 mm (0.8 in)
1920
34.8 mm (1.4 in)
1921
31.8 mm (1.3 in)
1922
18.0 mm (0.7 in)
1923
14.2 mm (0.6 in)
1924
21.8 mm (0.9 in)
1925
34.3 mm (1.4 in)
1926
18.3 mm (0.7 in)
1927
25.4 mm (1.0 in)
1928
13.7 mm (0.5 in)
1929
14.0 mm (0.6 in)
1930
15.7 mm (0.6 in)
1931
13.7 mm (0.5 in)
1932
9.9 mm (0.39 in)
1933
15.2 mm (0.6 in)
1934
15.0 mm (0.6 in)
1935
12.2 mm (0.5 in)
1936
52.1 mm (2.1 in)
1937
24.4 mm (1.0 in)
1938
13.5 mm (0.5 in)
1939
20.1 mm (0.8 in)
1940
16.8 mm (0.7 in)
1941
20.1 mm (0.8 in)
1942
19.1 mm (0.8 in)
1943
24.6 mm (1.0 in)
1944
28.7 mm (1.1 in)
1945
15.0 mm (0.6 in)
1946
19.1 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Rock Island, 1913 to 1946. The record is 72.7 mm (2.9 in) in 1936, marked on the chart; the median year is 29.6 mm (1.2 in).
Wettest five days (Rx5day) at Rock Island by year
Year
Wettest five days (Rx5day)
1913
29.0 mm (1.1 in)
1914
38.9 mm (1.5 in)
1915
45.7 mm (1.8 in)
1916
48.9 mm (1.9 in)
1917
51.6 mm (2.0 in)
1918
15.2 mm (0.6 in)
1919
21.6 mm (0.9 in)
1920
44.5 mm (1.8 in)
1921
31.8 mm (1.3 in)
1922
21.4 mm (0.8 in)
1923
22.1 mm (0.9 in)
1924
31.2 mm (1.2 in)
1925
34.3 mm (1.4 in)
1926
24.1 mm (0.9 in)
1927
25.7 mm (1.0 in)
1928
28.7 mm (1.1 in)
1929
20.8 mm (0.8 in)
1930
16.2 mm (0.6 in)
1931
23.1 mm (0.9 in)
1932
21.3 mm (0.8 in)
1933
25.7 mm (1.0 in)
1934
27.4 mm (1.1 in)
1935
20.9 mm (0.8 in)
1936
72.7 mm (2.9 in)
1937
61.0 mm (2.4 in)
1938
34.6 mm (1.4 in)
1939
22.4 mm (0.9 in)
1940
36.2 mm (1.4 in)
1941
31.0 mm (1.2 in)
1942
31.7 mm (1.2 in)
1943
29.0 mm (1.1 in)
1944
30.2 mm (1.2 in)
1945
32.8 mm (1.3 in)
1946
31.3 mm (1.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Rock Island, 1913 to 1946. The record is 107 days in 1924, marked on the chart; the median year is 59 days.
Longest dry spell (CDD) at Rock Island by year
Year
Longest dry spell (CDD)
1913
59 days
1914
55 days
1915
54 days
1916
79 days
1917
72 days
1918
21 days
1919
41 days
1920
41 days
1921
97 days
1922
77 days
1923
33 days
1924
107 days
1925
82 days
1926
59 days
1927
45 days
1928
51 days
1929
96 days
1930
45 days
1931
44 days
1932
70 days
1933
32 days
1934
48 days
1935
82 days
1936
63 days
1937
31 days
1938
68 days
1939
75 days
1940
49 days
1941
34 days
1942
84 days
1943
63 days
1944
75 days
1945
68 days
1946
52 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
28 years with a frost
Across 28 years with a frost, the median last spring frost at Rock Island falls on 26 April and the median first autumn frost on 17 October, which leaves a median of 170 days between them.
Fitted over all years, the growing season changes by +5.5 days per decade at this station.
Frost dates and growing season at Rock Island
Measure
Median, all years
Earliest period
Recent period (1914 to 1945)
Recent against earliest
Fitted trend
Last spring frost
26 April
n/a
26 April
n/a
-1.9 days per decade
First autumn frost
17 October
n/a
17 October
n/a
+3.5 days per decade
Growing days
170 days
n/a
170 days
n/a
+5.5 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, 1914 to 1946
A day with at least 20.1 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 65.8 mm (2.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Rock Island: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
20.1 mm (0.8 in)
5 years
29.1 mm (1.1 in)
10 years
36.1 mm (1.4 in)
25 years
46.5 mm (1.8 in)
50 years
55.5 mm (2.2 in)
Longer than the 30 years of record
100 years
65.8 mm (2.6 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 1914 to 1946.
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: 52.1 mm (2.1 in) in 1936; 45.7 mm (1.8 in) in 1915; 38.1 mm (1.5 in) in 1917.
Download the Data
Data for Rock Island standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rock Island 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.