Grover 10 W Weather Records (USC00053643)
Record envelope, standing records and threshold days for Grover 10 W (USC00053643), Colorado, United States, with 78 years of record.
Key Facts for Grover 10 W
- Grover 10 W (USC00053643) is a weather station in Colorado, United States at 40.85 latitude and -104.40 longitude, 1,551 m (5,090 ft) above sea level.
- The station reports from 1893 to 1970, 78 years of record.
- 1,464 records set at Grover 10 W still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Grover 10 W set a daily record precipitation of 31.5 mm (1.2 in) on 26 July 1970.
About the Station
- Location: Colorado, United States, 40.85 latitude, -104.40 longitude.
- Elevation: 1,551 m (5,090 ft).
- Period of record: 1893 to 1970, 78 years.
- Eligible elements: tmax, tmin, prcp, snow.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 20.6 C (69.1 F) | -35.6 C (-32.1 F) | n/a | n/a |
| Feb | 23.3 C (73.9 F) | -35.6 C (-32.1 F) | n/a | n/a |
| Mar | 26.7 C (80.1 F) | -32.2 C (-26.0 F) | n/a | n/a |
| Apr | 28.9 C (84.0 F) | -20.6 C (-5.1 F) | n/a | n/a |
| May | 33.9 C (93.0 F) | -11.1 C (12.0 F) | n/a | n/a |
| Jun | 40.0 C (104.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| Jul | 41.1 C (106.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Aug | 40.6 C (105.1 F) | -1.1 C (30.0 F) | n/a | n/a |
| Sep | 36.1 C (97.0 F) | -13.3 C (8.1 F) | n/a | n/a |
| Oct | 32.2 C (90.0 F) | -22.2 C (-8.0 F) | n/a | n/a |
| Nov | 26.1 C (79.0 F) | -26.7 C (-16.1 F) | n/a | n/a |
| Dec | 26.1 C (79.0 F) | -35.0 C (-31.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1893 | 19 |
| 1910 | 16 |
| 1911 | 7 |
| 1912 | 18 |
| 1913 | 26 |
| 1914 | 14 |
| 1915 | 32 |
| 1916 | 39 |
| 1917 | 35 |
| 1918 | 26 |
| 1919 | 22 |
| 1920 | 29 |
| 1921 | 25 |
| 1922 | 22 |
| 1923 | 15 |
| 1924 | 34 |
| 1925 | 25 |
| 1926 | 23 |
| 1927 | 30 |
| 1928 | 28 |
| 1929 | 24 |
| 1930 | 32 |
| 1931 | 28 |
| 1932 | 27 |
| 1933 | 23 |
| 1934 | 34 |
| 1935 | 24 |
| 1936 | 49 |
| 1937 | 25 |
| 1938 | 20 |
| 1939 | 36 |
| 1940 | 24 |
| 1941 | 11 |
| 1942 | 18 |
| 1943 | 28 |
| 1944 | 21 |
| 1945 | 28 |
| 1946 | 20 |
| 1947 | 24 |
| 1948 | 19 |
| 1949 | 12 |
| 1950 | 21 |
| 1951 | 23 |
| 1952 | 25 |
| 1953 | 15 |
| 1954 | 27 |
| 1955 | 24 |
| 1956 | 18 |
| 1957 | 11 |
| 1958 | 23 |
| 1959 | 28 |
| 1960 | 27 |
| 1961 | 4 |
| 1962 | 27 |
| 1963 | 29 |
| 1964 | 22 |
| 1965 | 24 |
| 1966 | 21 |
| 1967 | 22 |
| 1968 | 19 |
| 1969 | 35 |
| 1970 | 7 |
All-Time Record Progression
1 new records| Date | Kind | Detail |
|---|---|---|
| 1962-01-08 | Record daily snowfall | Record daily snowfall 40.6 cm (16.0 in) |
Wettest Day of Each Month
Jul: 96.5 mm (3.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 26.7 mm (1.1 in) | 16 January 1916 |
| Feb | 30.5 mm (1.2 in) | 28 February 1912 |
| Mar | 19.1 mm (0.8 in) | 11 March 1912 |
| Apr | 50.8 mm (2.0 in) | 20 April 1929 |
| May | 76.2 mm (3.0 in) | 20 May 1916 |
| Jun | 52.1 mm (2.1 in) | 29 June 1962 |
| Jul | 96.5 mm (3.8 in) | 28 July 1926 |
| Aug | 57.2 mm (2.3 in) | 5 August 1917 |
| Sep | 48.3 mm (1.9 in) | 11 September 1938 |
| Oct | 41.1 mm (1.6 in) | 16 October 1942 |
| Nov | 22.9 mm (0.9 in) | 13 November 1906 |
| Dec | 22.9 mm (0.9 in) | 13 December 1937 |
Period of Record Coverage
1893 to 1970| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1893 | 212 | 58% | No |
| 1910 | 248 | 68% | No |
| 1911 | 116 | 32% | No |
| 1912 | 349 | 95% | Yes |
| 1913 | 354 | 97% | Yes |
| 1914 | 352 | 96% | Yes |
| 1915 | 348 | 95% | Yes |
| 1916 | 353 | 96% | Yes |
| 1917 | 348 | 95% | Yes |
| 1918 | 346 | 95% | Yes |
| 1919 | 325 | 89% | No |
| 1920 | 350 | 96% | Yes |
| 1921 | 286 | 78% | No |
| 1922 | 272 | 75% | No |
| 1923 | 338 | 93% | Yes |
| 1924 | 334 | 91% | Yes |
| 1925 | 328 | 90% | No |
| 1926 | 316 | 87% | No |
| 1927 | 362 | 99% | Yes |
| 1928 | 331 | 90% | Yes |
| 1929 | 331 | 91% | Yes |
| 1930 | 342 | 94% | Yes |
| 1931 | 365 | 100% | Yes |
| 1932 | 364 | 99% | Yes |
| 1933 | 364 | 100% | Yes |
| 1934 | 334 | 92% | Yes |
| 1935 | 351 | 96% | Yes |
| 1936 | 323 | 88% | No |
| 1937 | 271 | 74% | No |
| 1938 | 365 | 100% | Yes |
| 1939 | 361 | 99% | Yes |
| 1940 | 342 | 93% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 363 | 99% | Yes |
| 1943 | 363 | 99% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 361 | 99% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 346 | 95% | Yes |
| 1950 | 361 | 99% | Yes |
| 1951 | 363 | 99% | Yes |
| 1952 | 364 | 99% | Yes |
| 1953 | 351 | 96% | Yes |
| 1954 | 350 | 96% | Yes |
| 1955 | 342 | 94% | Yes |
| 1956 | 351 | 96% | Yes |
| 1957 | 320 | 88% | No |
| 1958 | 352 | 96% | Yes |
| 1959 | 363 | 99% | Yes |
| 1960 | 274 | 75% | No |
| 1961 | 355 | 97% | Yes |
| 1962 | 357 | 98% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 364 | 100% | Yes |
| 1967 | 364 | 100% | Yes |
| 1968 | 359 | 98% | Yes |
| 1969 | 362 | 99% | Yes |
| 1970 | 146 | 40% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 26 July 1970 | Grover 10 W, US | daily rain | 31.5 mm (1.2 in) | 6.6 mm (0.26 in) | 11 years | 15 of 100 (Routine) |
| 15 July 1970 | Grover 10 W, US | daily low min (Tie) | 7.8 C (46.0 F) | tie | 76 years | 7 of 100 (Routine) |
| 12 June 1970 | Grover 10 W, US | daily rain | 32.0 mm (1.3 in) | 6.6 mm (0.26 in) | 28 years | 22 of 100 (Routine) |
| 31 May 1970 | Grover 10 W, US | daily low min | -6.1 C (21.0 F) | 6.1 C (11.0 F) | 52 years | 37 of 100 (Notable) |
| 27 May 1970 | Grover 10 W, US | daily high min | 10.6 C (51.1 F) | 0.6 C (1.1 F) | 44 years | 21 of 100 (Routine) |
| 23 May 1970 | Grover 10 W, US | daily rain | 38.1 mm (1.5 in) | 19.3 mm (0.8 in) | 17 years | 33 of 100 (Routine) |
| 22 May 1970 | Grover 10 W, US | daily high min | 13.9 C (57.0 F) | 1.1 C (2.0 F) | 5 years | 10 of 100 (Routine) |
| 20 May 1970 | Grover 10 W, US | daily high min | 12.8 C (55.0 F) | 1.7 C (3.1 F) | 37 years | 22 of 100 (Routine) |
| 14 May 1970 | Grover 10 W, US | daily low min | -6.1 C (21.0 F) | 0.5 C (0.9 F) | 16 years | 13 of 100 (Routine) |
| 17 February 1970 | Grover 10 W, US | daily high max | 20.6 C (69.1 F) | 2.3 C (4.1 F) | 35 years | 20 of 100 (Routine) |
| 27 January 1970 | Grover 10 W, US | daily high max (Tie) | 18.3 C (64.9 F) | tie | 35 years | 4 of 100 (Routine) |
| 23 January 1970 | Grover 10 W, US | daily high max | 19.4 C (66.9 F) | 1.6 C (2.9 F) | 8 years | 11 of 100 (Routine) |
| 13 December 1969 | Grover 10 W, US | daily high max | 19.4 C (66.9 F) | 1.1 C (2.0 F) | 48 years | 22 of 100 (Routine) |
| 2 December 1969 | Grover 10 W, US | daily high min (Tie) | -1.1 C (30.0 F) | tie | 59 years | 6 of 100 (Routine) |
| 18 November 1969 | Grover 10 W, US | daily low max (Tie) | -2.2 C (28.0 F) | tie | 40 years | 4 of 100 (Routine) |
| 11 November 1969 | Grover 10 W, US | daily high min | 3.3 C (37.9 F) | 0.5 C (0.9 F) | 40 years | 19 of 100 (Routine) |
| 16 October 1969 | Grover 10 W, US | daily low min | -11.7 C (10.9 F) | 2.8 C (5.0 F) | 56 years | 29 of 100 (Routine) |
| 16 October 1969 | Grover 10 W, US | daily low max | 3.9 C (39.0 F) | 3.9 C (7.0 F) | 20 years | 19 of 100 (Routine) |
| 15 October 1969 | Grover 10 W, US | daily snowfall | 2.5 cm (1.0 in) | 1.2 cm (0.5 in) | 50 years | 20 of 100 (Routine) |
| 15 October 1969 | Grover 10 W, US | daily low max | 1.7 C (35.1 F) | 5.5 C (9.9 F) | 3 years | 15 of 100 (Routine) |
Climate Trend
42 complete years, 1912 to 1969| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1912 | 6.9 C | -1.68 C |
| 1913 | 6.7 C | -1.79 C |
| 1914 | 7.8 C | -0.73 C |
| 1915 | 7.2 C | -1.31 C |
| 1916 | 6.9 C | -1.68 C |
| 1917 | 7.1 C | -1.44 C |
| 1918 | 7.3 C | -1.27 C |
| 1920 | 7.3 C | -1.24 C |
| 1923 | 7.6 C | -0.92 C |
| 1924 | 7.2 C | -1.36 C |
| 1927 | 8.4 C | -0.11 C |
| 1931 | 9.8 C | +1.23 C |
| 1932 | 8.0 C | -0.53 C |
| 1933 | 9.3 C | +0.78 C |
| 1938 | 9.4 C | +0.88 C |
| 1939 | 10.1 C | +1.52 C |
| 1941 | 9.1 C | +0.55 C |
| 1942 | 8.4 C | -0.14 C |
| 1943 | 9.7 C | +1.13 C |
| 1944 | 8.3 C | -0.21 C |
| 1945 | 7.9 C | -0.68 C |
| 1946 | 9.1 C | +0.59 C |
| 1947 | 8.4 C | -0.09 C |
| 1948 | 8.5 C | -0.02 C |
| 1950 | 8.6 C | +0.07 C |
| 1951 | 6.8 C | -1.71 C |
| 1952 | 8.2 C | -0.31 C |
| 1953 | 9.1 C | +0.57 C |
| 1954 | 9.8 C | +1.25 C |
| 1955 | 8.0 C | -0.57 C |
| 1956 | 9.2 C | +0.65 C |
| 1958 | 9.5 C | +0.99 C |
| 1959 | 8.7 C | +0.12 C |
| 1961 | 8.6 C | +0.03 C |
| 1962 | 9.3 C | +0.74 C |
| 1963 | 10.4 C | +1.91 C |
| 1964 | 9.4 C | +0.87 C |
| 1965 | 9.2 C | +0.64 C |
| 1966 | 9.5 C | +0.98 C |
| 1967 | 9.2 C | +0.62 C |
| 1968 | 9.1 C | +0.56 C |
| 1969 | 9.5 C | +0.97 C |
The annual mean temperature here has risen by 0.4 C (0.3 to 0.5) per decade over 1912 to 1969. In Fahrenheit: 0.7 F (0.5 to 0.9) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.4 C (0.3 to 0.5) per decade | 0.7 F (0.5 to 0.9) per decade | 1912 to 1969 | 42 | Rise |
| Mean daily maximum | 0.3 C (0.2 to 0.4) per decade | 0.5 F (0.3 to 0.8) per decade | 1912 to 1969 | 42 | Rise |
| Mean daily minimum | 0.5 C (0.3 to 0.6) per decade | 0.9 F (0.6 to 1.1) per decade | 1912 to 1969 | 42 | 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
1893 to 1970| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.1 C (106.0 F) | 1939 | 36.7 C (98.1 F) | 62 |
| Coldest night (TNn) | -35.6 C (-32.1 F) | 1930 | -26.7 C (-16.1 F) | 62 |
| Wettest day (Rx1day) | 96.5 mm (3.8 in) | 1926 | 33.5 mm (1.3 in) | 67 |
| Wettest five days (Rx5day) | 102.6 mm (4.0 in) | 1941 | 49.5 mm (1.9 in) | 67 |
| Longest dry spell (CDD) | 101 days | 1966 | 48 days | 67 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1893 | 35.6 C (96.1 F) |
| 1897 | n/a |
| 1898 | n/a |
| 1905 | n/a |
| 1906 | n/a |
| 1907 | n/a |
| 1910 | 36.7 C (98.1 F) |
| 1911 | 20.6 C (69.1 F) |
| 1912 | 35.6 C (96.1 F) |
| 1913 | 36.7 C (98.1 F) |
| 1914 | 36.1 C (97.0 F) |
| 1915 | 33.9 C (93.0 F) |
| 1916 | 35.6 C (96.1 F) |
| 1917 | 36.1 C (97.0 F) |
| 1918 | 35.6 C (96.1 F) |
| 1919 | 37.2 C (99.0 F) |
| 1920 | 36.1 C (97.0 F) |
| 1921 | 35.6 C (96.1 F) |
| 1922 | 38.3 C (100.9 F) |
| 1923 | 32.8 C (91.0 F) |
| 1924 | 37.2 C (99.0 F) |
| 1925 | 37.2 C (99.0 F) |
| 1926 | 37.2 C (99.0 F) |
| 1927 | 36.7 C (98.1 F) |
| 1928 | 36.7 C (98.1 F) |
| 1929 | 35.6 C (96.1 F) |
| 1930 | 36.7 C (98.1 F) |
| 1931 | 38.9 C (102.0 F) |
| 1932 | 36.7 C (98.1 F) |
| 1933 | 38.9 C (102.0 F) |
| 1934 | 40.0 C (104.0 F) |
| 1935 | 40.6 C (105.1 F) |
| 1936 | 39.4 C (102.9 F) |
| 1937 | 38.3 C (100.9 F) |
| 1938 | 38.9 C (102.0 F) |
| 1939 | 41.1 C (106.0 F) |
| 1940 | 39.4 C (102.9 F) |
| 1941 | 36.7 C (98.1 F) |
| 1942 | 35.0 C (95.0 F) |
| 1943 | 35.6 C (96.1 F) |
| 1944 | 37.8 C (100.0 F) |
| 1945 | 35.6 C (96.1 F) |
| 1946 | 36.7 C (98.1 F) |
| 1947 | 36.7 C (98.1 F) |
| 1948 | 35.6 C (96.1 F) |
| 1949 | 34.4 C (93.9 F) |
| 1950 | 33.9 C (93.0 F) |
| 1951 | 36.7 C (98.1 F) |
| 1952 | 37.8 C (100.0 F) |
| 1953 | 37.8 C (100.0 F) |
| 1954 | 40.0 C (104.0 F) |
| 1955 | 36.1 C (97.0 F) |
| 1956 | 36.7 C (98.1 F) |
| 1957 | 35.6 C (96.1 F) |
| 1958 | 36.7 C (98.1 F) |
| 1959 | 36.1 C (97.0 F) |
| 1960 | 37.8 C (100.0 F) |
| 1961 | 35.6 C (96.1 F) |
| 1962 | 36.7 C (98.1 F) |
| 1963 | 37.8 C (100.0 F) |
| 1964 | 37.8 C (100.0 F) |
| 1965 | 35.6 C (96.1 F) |
| 1966 | 37.8 C (100.0 F) |
| 1967 | 35.6 C (96.1 F) |
| 1968 | 36.7 C (98.1 F) |
| 1969 | 39.4 C (102.9 F) |
| 1970 | 36.1 C (97.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1893 | -25.6 C (-14.1 F) |
| 1897 | n/a |
| 1898 | n/a |
| 1905 | n/a |
| 1906 | n/a |
| 1907 | n/a |
| 1910 | -13.9 C (7.0 F) |
| 1911 | -28.9 C (-20.0 F) |
| 1912 | -26.1 C (-15.0 F) |
| 1913 | -33.3 C (-27.9 F) |
| 1914 | -29.4 C (-20.9 F) |
| 1915 | -27.8 C (-18.0 F) |
| 1916 | -28.3 C (-18.9 F) |
| 1917 | -28.9 C (-20.0 F) |
| 1918 | -28.3 C (-18.9 F) |
| 1919 | -35.0 C (-31.0 F) |
| 1920 | -26.1 C (-15.0 F) |
| 1921 | -23.9 C (-11.0 F) |
| 1922 | -32.2 C (-26.0 F) |
| 1923 | -32.2 C (-26.0 F) |
| 1924 | -34.4 C (-29.9 F) |
| 1925 | -22.8 C (-9.0 F) |
| 1926 | -28.3 C (-18.9 F) |
| 1927 | -27.8 C (-18.0 F) |
| 1928 | -26.7 C (-16.1 F) |
| 1929 | -26.7 C (-16.1 F) |
| 1930 | -35.6 C (-32.1 F) |
| 1931 | -20.6 C (-5.1 F) |
| 1932 | -30.0 C (-22.0 F) |
| 1933 | -31.7 C (-25.1 F) |
| 1934 | -23.3 C (-9.9 F) |
| 1935 | -29.4 C (-20.9 F) |
| 1936 | -35.6 C (-32.1 F) |
| 1937 | -30.6 C (-23.1 F) |
| 1938 | -20.6 C (-5.1 F) |
| 1939 | -24.4 C (-11.9 F) |
| 1940 | -26.7 C (-16.1 F) |
| 1941 | -21.1 C (-6.0 F) |
| 1942 | -28.9 C (-20.0 F) |
| 1943 | -28.3 C (-18.9 F) |
| 1944 | -21.1 C (-6.0 F) |
| 1945 | -24.4 C (-11.9 F) |
| 1946 | -20.0 C (-4.0 F) |
| 1947 | -22.2 C (-8.0 F) |
| 1948 | -26.1 C (-15.0 F) |
| 1949 | -25.0 C (-13.0 F) |
| 1950 | -27.8 C (-18.0 F) |
| 1951 | -32.2 C (-26.0 F) |
| 1952 | -23.9 C (-11.0 F) |
| 1953 | -20.6 C (-5.1 F) |
| 1954 | -23.3 C (-9.9 F) |
| 1955 | -23.9 C (-11.0 F) |
| 1956 | -22.2 C (-8.0 F) |
| 1957 | -15.6 C (3.9 F) |
| 1958 | -18.9 C (-2.0 F) |
| 1959 | -28.9 C (-20.0 F) |
| 1960 | -26.1 C (-15.0 F) |
| 1961 | -23.9 C (-11.0 F) |
| 1962 | -31.1 C (-24.0 F) |
| 1963 | -32.8 C (-27.0 F) |
| 1964 | -30.6 C (-23.1 F) |
| 1965 | -21.7 C (-7.1 F) |
| 1966 | -26.7 C (-16.1 F) |
| 1967 | -25.6 C (-14.1 F) |
| 1968 | -26.7 C (-16.1 F) |
| 1969 | -21.1 C (-6.0 F) |
| 1970 | -21.7 C (-7.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1893 | 17.8 mm (0.7 in) |
| 1897 | 31.8 mm (1.3 in) |
| 1898 | 21.3 mm (0.8 in) |
| 1905 | 33.0 mm (1.3 in) |
| 1906 | 48.3 mm (1.9 in) |
| 1907 | 17.8 mm (0.7 in) |
| 1910 | 30.2 mm (1.2 in) |
| 1911 | 15.2 mm (0.6 in) |
| 1912 | 30.5 mm (1.2 in) |
| 1913 | 38.4 mm (1.5 in) |
| 1914 | 26.2 mm (1.0 in) |
| 1915 | 42.4 mm (1.7 in) |
| 1916 | 76.2 mm (3.0 in) |
| 1917 | 57.2 mm (2.3 in) |
| 1918 | 31.8 mm (1.3 in) |
| 1919 | 63.5 mm (2.5 in) |
| 1920 | 31.8 mm (1.3 in) |
| 1921 | 36.1 mm (1.4 in) |
| 1922 | 76.2 mm (3.0 in) |
| 1923 | 27.2 mm (1.1 in) |
| 1924 | 38.1 mm (1.5 in) |
| 1925 | 26.7 mm (1.1 in) |
| 1926 | 96.5 mm (3.8 in) |
| 1927 | 19.1 mm (0.8 in) |
| 1928 | 17.3 mm (0.7 in) |
| 1929 | 50.8 mm (2.0 in) |
| 1930 | 49.5 mm (1.9 in) |
| 1931 | 25.4 mm (1.0 in) |
| 1932 | 38.4 mm (1.5 in) |
| 1933 | 49.0 mm (1.9 in) |
| 1934 | 29.7 mm (1.2 in) |
| 1935 | 27.9 mm (1.1 in) |
| 1936 | 24.1 mm (0.9 in) |
| 1937 | 22.9 mm (0.9 in) |
| 1938 | 48.3 mm (1.9 in) |
| 1939 | 15.2 mm (0.6 in) |
| 1940 | 24.4 mm (1.0 in) |
| 1941 | 45.7 mm (1.8 in) |
| 1942 | 41.1 mm (1.6 in) |
| 1943 | 30.5 mm (1.2 in) |
| 1944 | 54.6 mm (2.1 in) |
| 1945 | 47.8 mm (1.9 in) |
| 1946 | 22.6 mm (0.9 in) |
| 1947 | 29.7 mm (1.2 in) |
| 1948 | 44.2 mm (1.7 in) |
| 1949 | 38.1 mm (1.5 in) |
| 1950 | 38.9 mm (1.5 in) |
| 1951 | 38.4 mm (1.5 in) |
| 1952 | 28.4 mm (1.1 in) |
| 1953 | 57.2 mm (2.3 in) |
| 1954 | 44.5 mm (1.8 in) |
| 1955 | 40.9 mm (1.6 in) |
| 1956 | 19.3 mm (0.8 in) |
| 1957 | 50.8 mm (2.0 in) |
| 1958 | 45.7 mm (1.8 in) |
| 1959 | 27.9 mm (1.1 in) |
| 1960 | 16.5 mm (0.6 in) |
| 1961 | 27.4 mm (1.1 in) |
| 1962 | 52.1 mm (2.1 in) |
| 1963 | 25.7 mm (1.0 in) |
| 1964 | 25.7 mm (1.0 in) |
| 1965 | 36.8 mm (1.4 in) |
| 1966 | 33.5 mm (1.3 in) |
| 1967 | 33.0 mm (1.3 in) |
| 1968 | 41.1 mm (1.6 in) |
| 1969 | 44.5 mm (1.8 in) |
| 1970 | 38.1 mm (1.5 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1893 | 21.6 mm (0.9 in) |
| 1897 | 57.6 mm (2.3 in) |
| 1898 | 24.6 mm (1.0 in) |
| 1905 | 45.7 mm (1.8 in) |
| 1906 | 48.3 mm (1.9 in) |
| 1907 | 17.8 mm (0.7 in) |
| 1910 | 37.5 mm (1.5 in) |
| 1911 | 15.5 mm (0.6 in) |
| 1912 | 52.6 mm (2.1 in) |
| 1913 | 68.7 mm (2.7 in) |
| 1914 | 42.6 mm (1.7 in) |
| 1915 | 72.4 mm (2.9 in) |
| 1916 | 85.0 mm (3.3 in) |
| 1917 | 57.2 mm (2.3 in) |
| 1918 | 59.7 mm (2.4 in) |
| 1919 | 72.9 mm (2.9 in) |
| 1920 | 64.1 mm (2.5 in) |
| 1921 | 90.3 mm (3.6 in) |
| 1922 | 79.5 mm (3.1 in) |
| 1923 | 37.9 mm (1.5 in) |
| 1924 | 41.9 mm (1.6 in) |
| 1925 | 36.3 mm (1.4 in) |
| 1926 | 53.8 mm (2.1 in) |
| 1927 | 29.7 mm (1.2 in) |
| 1928 | 39.6 mm (1.6 in) |
| 1929 | 90.8 mm (3.6 in) |
| 1930 | 100.8 mm (4.0 in) |
| 1931 | 45.5 mm (1.8 in) |
| 1932 | 44.2 mm (1.7 in) |
| 1933 | 79.0 mm (3.1 in) |
| 1934 | 42.1 mm (1.7 in) |
| 1935 | 51.0 mm (2.0 in) |
| 1936 | 26.5 mm (1.0 in) |
| 1937 | 37.1 mm (1.5 in) |
| 1938 | 83.1 mm (3.3 in) |
| 1939 | 28.6 mm (1.1 in) |
| 1940 | 31.8 mm (1.3 in) |
| 1941 | 102.6 mm (4.0 in) |
| 1942 | 69.1 mm (2.7 in) |
| 1943 | 89.3 mm (3.5 in) |
| 1944 | 54.6 mm (2.1 in) |
| 1945 | 40.6 mm (1.6 in) |
| 1946 | 32.5 mm (1.3 in) |
| 1947 | 43.2 mm (1.7 in) |
| 1948 | 48.8 mm (1.9 in) |
| 1949 | 62.5 mm (2.5 in) |
| 1950 | 72.6 mm (2.9 in) |
| 1951 | 43.9 mm (1.7 in) |
| 1952 | 49.5 mm (1.9 in) |
| 1953 | 75.5 mm (3.0 in) |
| 1954 | 44.5 mm (1.8 in) |
| 1955 | 46.3 mm (1.8 in) |
| 1956 | 34.3 mm (1.4 in) |
| 1957 | 99.7 mm (3.9 in) |
| 1958 | 52.8 mm (2.1 in) |
| 1959 | 41.4 mm (1.6 in) |
| 1960 | 30.0 mm (1.2 in) |
| 1961 | 60.2 mm (2.4 in) |
| 1962 | 55.7 mm (2.2 in) |
| 1963 | 30.8 mm (1.2 in) |
| 1964 | 27.4 mm (1.1 in) |
| 1965 | 70.6 mm (2.8 in) |
| 1966 | 49.5 mm (1.9 in) |
| 1967 | 52.1 mm (2.1 in) |
| 1968 | 48.7 mm (1.9 in) |
| 1969 | 61.0 mm (2.4 in) |
| 1970 | 49.8 mm (2.0 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1893 | 50 days |
| 1897 | 27 days |
| 1898 | 18 days |
| 1905 | 31 days |
| 1906 | 48 days |
| 1907 | 40 days |
| 1910 | 55 days |
| 1911 | 25 days |
| 1912 | 29 days |
| 1913 | 29 days |
| 1914 | 52 days |
| 1915 | 73 days |
| 1916 | 28 days |
| 1917 | 30 days |
| 1918 | 36 days |
| 1919 | 30 days |
| 1920 | 37 days |
| 1921 | 26 days |
| 1922 | 57 days |
| 1923 | 34 days |
| 1924 | 55 days |
| 1925 | 72 days |
| 1926 | 38 days |
| 1927 | 58 days |
| 1928 | 47 days |
| 1929 | 42 days |
| 1930 | 39 days |
| 1931 | 58 days |
| 1932 | 73 days |
| 1933 | 65 days |
| 1934 | 92 days |
| 1935 | 58 days |
| 1936 | 65 days |
| 1937 | 51 days |
| 1938 | 38 days |
| 1939 | 75 days |
| 1940 | 34 days |
| 1941 | 59 days |
| 1942 | 38 days |
| 1943 | 53 days |
| 1944 | 74 days |
| 1945 | 49 days |
| 1946 | 52 days |
| 1947 | 39 days |
| 1948 | 38 days |
| 1949 | 41 days |
| 1950 | 47 days |
| 1951 | 37 days |
| 1952 | 45 days |
| 1953 | 57 days |
| 1954 | 56 days |
| 1955 | 33 days |
| 1956 | 76 days |
| 1957 | 42 days |
| 1958 | 43 days |
| 1959 | 62 days |
| 1960 | 42 days |
| 1961 | 25 days |
| 1962 | 53 days |
| 1963 | 61 days |
| 1964 | 66 days |
| 1965 | 74 days |
| 1966 | 101 days |
| 1967 | 35 days |
| 1968 | 80 days |
| 1969 | 63 days |
| 1970 | 59 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
42 years with a frostAcross 42 years with a frost, the median last spring frost at Grover 10 W falls on 15 May and the median first autumn frost on 22 September, which leaves a median of 128 days between them.
Fitted over all years, the growing season changes by +7.5 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1932 to 1969) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 15 May | n/a | 14 May | n/a | -3.0 days per decade |
| First autumn frost | 22 September | n/a | 26 September | n/a | +4.4 days per decade |
| Growing days | 128 days | n/a | 137 days | n/a | +7.5 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
45 years, 1912 to 1969A day with at least 36.0 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 76.0 mm (3.0 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 36.0 mm (1.4 in) | |
| 5 years | 47.6 mm (1.9 in) | |
| 10 years | 54.9 mm (2.2 in) | |
| 25 years | 63.7 mm (2.5 in) | |
| 50 years | 70.0 mm (2.8 in) | Longer than the 45 years of record |
| 100 years | 76.0 mm (3.0 in) | Longer than the 45 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, 45 years of values from 1912 to 1969.
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: 76.2 mm (3.0 in) in 1916; 63.5 mm (2.5 in) in 1919; 57.2 mm (2.3 in) in 1917.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Grover 10 W, at 1962. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1962 ran 0.6 C (1.0 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1962 | +0.6 | +1.0 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).