Bonanza Weather Records (USC00420802)
Record envelope, standing records and threshold days for Bonanza (USC00420802), Utah, United States, with 56 years of record.
Key Facts for Bonanza
- Bonanza (USC00420802) is a weather station in Utah, United States at 40.02 latitude and -109.18 longitude, 1,661 m (5,450 ft) above sea level.
- The station reports from 1938 to 1993, 56 years of record.
- 1,464 records set at Bonanza still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Bonanza set a daily record precipitation of 5.6 mm (0.22 in) on 19 January 1993.
About the Station
- Location: Utah, United States, 40.02 latitude, -109.18 longitude.
- Elevation: 1,661 m (5,450 ft).
- Period of record: 1938 to 1993, 56 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
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 | 16.1 C (61.0 F) | -31.7 C (-25.1 F) | n/a | n/a |
| Feb | 19.4 C (66.9 F) | -33.3 C (-27.9 F) | n/a | n/a |
| Mar | 25.0 C (77.0 F) | -20.6 C (-5.1 F) | n/a | n/a |
| Apr | 32.2 C (90.0 F) | -15.0 C (5.0 F) | n/a | n/a |
| May | 34.4 C (93.9 F) | -7.2 C (19.0 F) | n/a | n/a |
| Jun | 39.4 C (102.9 F) | -2.8 C (27.0 F) | n/a | n/a |
| Jul | 41.1 C (106.0 F) | 0.6 C (33.1 F) | n/a | n/a |
| Aug | 41.1 C (106.0 F) | -2.2 C (28.0 F) | n/a | n/a |
| Sep | 38.3 C (100.9 F) | -3.3 C (26.1 F) | n/a | n/a |
| Oct | 31.7 C (89.1 F) | -18.3 C (-0.9 F) | n/a | n/a |
| Nov | 25.0 C (77.0 F) | -20.6 C (-5.1 F) | n/a | n/a |
| Dec | 16.1 C (61.0 F) | -35.6 C (-32.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1938 | 14 |
| 1939 | 31 |
| 1940 | 40 |
| 1941 | 35 |
| 1942 | 25 |
| 1943 | 50 |
| 1944 | 23 |
| 1945 | 54 |
| 1946 | 20 |
| 1947 | 34 |
| 1948 | 53 |
| 1949 | 44 |
| 1950 | 41 |
| 1951 | 19 |
| 1952 | 29 |
| 1953 | 16 |
| 1954 | 35 |
| 1955 | 37 |
| 1956 | 20 |
| 1957 | 24 |
| 1958 | 30 |
| 1959 | 12 |
| 1960 | 6 |
| 1966 | 31 |
| 1967 | 26 |
| 1968 | 23 |
| 1969 | 22 |
| 1970 | 25 |
| 1971 | 41 |
| 1972 | 23 |
| 1973 | 19 |
| 1974 | 12 |
| 1975 | 35 |
| 1976 | 19 |
| 1977 | 42 |
| 1978 | 48 |
| 1979 | 23 |
| 1980 | 23 |
| 1981 | 30 |
| 1982 | 30 |
| 1983 | 27 |
| 1984 | 34 |
| 1985 | 33 |
| 1986 | 39 |
| 1987 | 16 |
| 1988 | 15 |
| 1989 | 32 |
| 1990 | 44 |
| 1991 | 34 |
| 1992 | 26 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 1981-07-07 | Record high maximum temperature | Record high maximum temperature 41.1 C (106.0 F) |
| 1989-02-07 | Record low minimum temperature | Record low minimum temperature -33.3 C (-27.9 F) |
| 1990-12-22 | Record low minimum temperature | Record low minimum temperature -34.4 C (-29.9 F) |
| 1990-12-23 | Record low maximum temperature | Record low maximum temperature -22.2 C (-8.0 F) |
| 1990-12-23 | Record low minimum temperature | Record low minimum temperature -35.6 C (-32.1 F) |
Wettest Day of Each Month
Jun: 47.8 mm (1.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 26.9 mm (1.1 in) | 15 January 1941 |
| Feb | 20.3 mm (0.8 in) | 20 February 1986 |
| Mar | 26.2 mm (1.0 in) | 28 March 1979 |
| Apr | 25.9 mm (1.0 in) | 1 April 1975 |
| May | 28.4 mm (1.1 in) | 31 May 1985 |
| Jun | 47.8 mm (1.9 in) | 11 June 1970 |
| Jul | 36.8 mm (1.4 in) | 21 July 1985 |
| Aug | 25.9 mm (1.0 in) | 11 August 1982 |
| Sep | 33.0 mm (1.3 in) | 13 September 1958 |
| Oct | 36.8 mm (1.4 in) | 24 October 1956 |
| Nov | 18.0 mm (0.7 in) | 12 November 1978 |
| Dec | 31.2 mm (1.2 in) | 6 December 1966 |
Period of Record Coverage
1938 to 1993| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1938 | 153 | 42% | No |
| 1939 | 359 | 98% | Yes |
| 1940 | 366 | 100% | Yes |
| 1941 | 353 | 97% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 361 | 99% | Yes |
| 1944 | 340 | 93% | Yes |
| 1945 | 354 | 97% | Yes |
| 1946 | 356 | 98% | Yes |
| 1947 | 358 | 98% | Yes |
| 1948 | 363 | 99% | Yes |
| 1949 | 364 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 352 | 96% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 349 | 96% | Yes |
| 1960 | 119 | 33% | No |
| 1966 | 174 | 48% | No |
| 1967 | 300 | 82% | No |
| 1968 | 226 | 62% | No |
| 1969 | 284 | 78% | No |
| 1970 | 301 | 82% | No |
| 1971 | 270 | 74% | No |
| 1972 | 154 | 42% | No |
| 1973 | 244 | 67% | No |
| 1974 | 312 | 85% | No |
| 1975 | 357 | 98% | Yes |
| 1976 | 364 | 99% | Yes |
| 1977 | 363 | 99% | Yes |
| 1978 | 363 | 99% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 365 | 100% | Yes |
| 1981 | 362 | 99% | Yes |
| 1982 | 364 | 100% | Yes |
| 1983 | 350 | 96% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 349 | 96% | Yes |
| 1986 | 348 | 95% | Yes |
| 1987 | 347 | 95% | Yes |
| 1988 | 339 | 93% | Yes |
| 1989 | 361 | 99% | Yes |
| 1990 | 358 | 98% | Yes |
| 1991 | 319 | 87% | No |
| 1992 | 338 | 92% | Yes |
| 1993 | 44 | 12% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 19 January 1993 | Bonanza, US | daily rain | 5.6 mm (0.22 in) | 1.3 mm (0.05 in) | 6 years | 9 of 100 (Routine) |
| 19 January 1993 | Bonanza, US | daily snowfall (Tie) | 10.2 cm (4.0 in) | tie | 6 years | 1 of 100 (Routine) |
| 18 January 1993 | Bonanza, US | daily rain (Tie) | 5.1 mm (0.20 in) | tie | 19 years | 2 of 100 (Routine) |
| 9 January 1993 | Bonanza, US | daily rain | 12.7 mm (0.5 in) | 9.4 mm (0.37 in) | 8 years | 20 of 100 (Routine) |
| 9 January 1993 | Bonanza, US | daily snowfall | 11.4 cm (4.5 in) | 8.9 cm (3.5 in) | 8 years | 29 of 100 (Routine) |
| 8 January 1993 | Bonanza, US | daily snowfall | 12.7 cm (5.0 in) | 7.6 cm (3.0 in) | 53 years | 39 of 100 (Notable) |
| 3 January 1993 | Bonanza, US | daily rain | 11.7 mm (0.5 in) | 5.3 mm (0.21 in) | 49 years | 20 of 100 (Routine) |
| 7 December 1992 | Bonanza, US | daily low min | -21.1 C (-6.0 F) | 1.7 C (3.1 F) | 41 years | 19 of 100 (Routine) |
| 5 December 1992 | Bonanza, US | daily low max (Tie) | -3.9 C (25.0 F) | tie | 25 years | 3 of 100 (Routine) |
| 30 November 1992 | Bonanza, US | daily low min | -20.0 C (-4.0 F) | 1.1 C (2.0 F) | 13 years | 10 of 100 (Routine) |
| 29 November 1992 | Bonanza, US | daily snowfall | 10.2 cm (4.0 in) | 7.7 cm (3.0 in) | 38 years | 34 of 100 (Routine) |
| 29 November 1992 | Bonanza, US | daily snow depth | 10.2 cm (4.0 in) | 5.1 cm (2.0 in) | 50 years | 31 of 100 (Routine) |
| 29 November 1992 | Bonanza, US | daily rain | 3.8 mm (0.15 in) | 1.5 mm (0.06 in) | 26 years | 15 of 100 (Routine) |
| 26 November 1992 | Bonanza, US | daily low max | -6.1 C (21.0 F) | 2.2 C (4.0 F) | 52 years | 23 of 100 (Routine) |
| 26 November 1992 | Bonanza, US | daily low min (Tie) | -17.2 C (1.0 F) | tie | 48 years | 4 of 100 (Routine) |
| 25 November 1992 | Bonanza, US | daily low min | -17.2 C (1.0 F) | 1.6 C (2.9 F) | 40 years | 20 of 100 (Routine) |
| 23 November 1992 | Bonanza, US | daily snowfall | 6.4 cm (2.5 in) | 4.6 cm (1.8 in) | 49 years | 30 of 100 (Routine) |
| 11 November 1992 | Bonanza, US | daily low min | -12.8 C (9.0 F) | 2.2 C (4.0 F) | 42 years | 21 of 100 (Routine) |
| 31 October 1992 | Bonanza, US | daily rain | 19.6 mm (0.8 in) | 2.1 mm (0.08 in) | 17 years | 13 of 100 (Routine) |
| 25 October 1992 | Bonanza, US | daily rain (Tie) | 4.1 mm (0.16 in) | tie | 39 years | 4 of 100 (Routine) |
Climate Trend
31 complete years, 1939 to 1990| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1939 | 8.7 C | -0.43 C |
| 1940 | 9.3 C | +0.21 C |
| 1941 | 7.8 C | -1.38 C |
| 1942 | 8.3 C | -0.84 C |
| 1943 | 10.1 C | +0.96 C |
| 1945 | 9.8 C | +0.67 C |
| 1946 | 10.5 C | +1.35 C |
| 1947 | 9.7 C | +0.60 C |
| 1948 | 9.1 C | -0.06 C |
| 1949 | 8.6 C | -0.55 C |
| 1950 | 9.1 C | -0.01 C |
| 1953 | 10.1 C | +1.00 C |
| 1954 | 10.7 C | +1.54 C |
| 1956 | 9.5 C | +0.41 C |
| 1957 | 9.1 C | -0.02 C |
| 1958 | 10.3 C | +1.12 C |
| 1967 | 8.5 C | -0.65 C |
| 1969 | 9.0 C | -0.18 C |
| 1970 | 8.6 C | -0.57 C |
| 1975 | 8.4 C | -0.71 C |
| 1976 | 9.5 C | +0.39 C |
| 1977 | 10.5 C | +1.36 C |
| 1978 | 8.4 C | -0.78 C |
| 1979 | 7.7 C | -1.44 C |
| 1980 | 9.6 C | +0.48 C |
| 1981 | 10.8 C | +1.67 C |
| 1982 | 8.5 C | -0.61 C |
| 1983 | 9.1 C | -0.04 C |
| 1984 | 7.1 C | -2.03 C |
| 1989 | 8.5 C | -0.67 C |
| 1990 | 8.2 C | -0.92 C |
The fitted trend in annual mean temperature here over 1939 to 1990 is -0.1 C (-0.3 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.3 F (-0.6 to 0.1) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.1 C (-0.3 to 0.1) per decade | -0.3 F (-0.6 to 0.1) per decade | 1939 to 1990 | 31 | Not clearly different from zero |
| Mean daily maximum | -0.23 C (-0.50 to 0.05) per decade | -0.4 F (-0.9 to 0.1) per decade | 1939 to 1990 | 31 | Not clearly different from zero |
| Mean daily minimum | -0.1 C (-0.2 to 0.1) per decade | -0.1 F (-0.4 to 0.2) per decade | 1939 to 1990 | 31 | Not clearly different from zero |
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
1938 to 1993| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.1 C (106.0 F) | 1981 | 38.3 C (100.9 F) | 51 |
| Coldest night (TNn) | -35.6 C (-32.1 F) | 1990 | -25.6 C (-14.1 F) | 51 |
| Wettest day (Rx1day) | 47.8 mm (1.9 in) | 1970 | 20.8 mm (0.8 in) | 51 |
| Wettest five days (Rx5day) | 80.6 mm (3.2 in) | 1970 | 30.5 mm (1.2 in) | 51 |
| Longest dry spell (CDD) | 104 days | 1972 | 43 days | 51 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1938 | 37.8 C (100.0 F) |
| 1939 | 38.9 C (102.0 F) |
| 1940 | 39.4 C (102.9 F) |
| 1941 | 37.2 C (99.0 F) |
| 1942 | 37.2 C (99.0 F) |
| 1943 | 40.6 C (105.1 F) |
| 1944 | 36.1 C (97.0 F) |
| 1945 | 38.3 C (100.9 F) |
| 1946 | 37.2 C (99.0 F) |
| 1947 | 39.4 C (102.9 F) |
| 1948 | 37.8 C (100.0 F) |
| 1949 | 39.4 C (102.9 F) |
| 1950 | 37.2 C (99.0 F) |
| 1951 | 37.2 C (99.0 F) |
| 1952 | 37.2 C (99.0 F) |
| 1953 | 38.3 C (100.9 F) |
| 1954 | 39.4 C (102.9 F) |
| 1955 | 38.3 C (100.9 F) |
| 1956 | 37.2 C (99.0 F) |
| 1957 | 36.7 C (98.1 F) |
| 1958 | 37.8 C (100.0 F) |
| 1959 | 38.3 C (100.9 F) |
| 1960 | 25.6 C (78.1 F) |
| 1966 | 37.8 C (100.0 F) |
| 1967 | 36.1 C (97.0 F) |
| 1968 | 38.9 C (102.0 F) |
| 1969 | 37.2 C (99.0 F) |
| 1970 | 37.8 C (100.0 F) |
| 1971 | 40.6 C (105.1 F) |
| 1972 | 37.2 C (99.0 F) |
| 1973 | 38.3 C (100.9 F) |
| 1974 | 37.8 C (100.0 F) |
| 1975 | 37.2 C (99.0 F) |
| 1976 | 38.3 C (100.9 F) |
| 1977 | 38.9 C (102.0 F) |
| 1978 | 38.3 C (100.9 F) |
| 1979 | 38.3 C (100.9 F) |
| 1980 | 37.8 C (100.0 F) |
| 1981 | 41.1 C (106.0 F) |
| 1982 | 38.9 C (102.0 F) |
| 1983 | 41.1 C (106.0 F) |
| 1984 | 38.3 C (100.9 F) |
| 1985 | 39.4 C (102.9 F) |
| 1986 | 38.9 C (102.0 F) |
| 1987 | 39.4 C (102.9 F) |
| 1988 | 38.3 C (100.9 F) |
| 1989 | 38.9 C (102.0 F) |
| 1990 | 38.3 C (100.9 F) |
| 1991 | 35.6 C (96.1 F) |
| 1992 | 35.0 C (95.0 F) |
| 1993 | 7.2 C (45.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1938 | -20.6 C (-5.1 F) |
| 1939 | -24.4 C (-11.9 F) |
| 1940 | -27.2 C (-17.0 F) |
| 1941 | -26.1 C (-15.0 F) |
| 1942 | -28.9 C (-20.0 F) |
| 1943 | -21.7 C (-7.1 F) |
| 1944 | -25.6 C (-14.1 F) |
| 1945 | -21.1 C (-6.0 F) |
| 1946 | -21.1 C (-6.0 F) |
| 1947 | -21.7 C (-7.1 F) |
| 1948 | -26.7 C (-16.1 F) |
| 1949 | -30.0 C (-22.0 F) |
| 1950 | -29.4 C (-20.9 F) |
| 1951 | -28.3 C (-18.9 F) |
| 1952 | -31.7 C (-25.1 F) |
| 1953 | -19.4 C (-2.9 F) |
| 1954 | -20.6 C (-5.1 F) |
| 1955 | -26.1 C (-15.0 F) |
| 1956 | -23.3 C (-9.9 F) |
| 1957 | -26.1 C (-15.0 F) |
| 1958 | -18.9 C (-2.0 F) |
| 1959 | -20.6 C (-5.1 F) |
| 1960 | -25.0 C (-13.0 F) |
| 1966 | -24.4 C (-11.9 F) |
| 1967 | -22.8 C (-9.0 F) |
| 1968 | -26.7 C (-16.1 F) |
| 1969 | -20.0 C (-4.0 F) |
| 1970 | -22.2 C (-8.0 F) |
| 1971 | -29.4 C (-20.9 F) |
| 1972 | -22.2 C (-8.0 F) |
| 1973 | -27.8 C (-18.0 F) |
| 1974 | -29.4 C (-20.9 F) |
| 1975 | -21.1 C (-6.0 F) |
| 1976 | -22.8 C (-9.0 F) |
| 1977 | -20.0 C (-4.0 F) |
| 1978 | -27.8 C (-18.0 F) |
| 1979 | -30.6 C (-23.1 F) |
| 1980 | -22.2 C (-8.0 F) |
| 1981 | -15.6 C (3.9 F) |
| 1982 | -25.6 C (-14.1 F) |
| 1983 | -23.3 C (-9.9 F) |
| 1984 | -31.1 C (-24.0 F) |
| 1985 | -30.0 C (-22.0 F) |
| 1986 | -16.1 C (3.0 F) |
| 1987 | -25.0 C (-13.0 F) |
| 1988 | -25.6 C (-14.1 F) |
| 1989 | -33.3 C (-27.9 F) |
| 1990 | -35.6 C (-32.1 F) |
| 1991 | -26.1 C (-15.0 F) |
| 1992 | -27.8 C (-18.0 F) |
| 1993 | -27.8 C (-18.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1938 | 30.2 mm (1.2 in) |
| 1939 | 22.9 mm (0.9 in) |
| 1940 | 21.3 mm (0.8 in) |
| 1941 | 30.5 mm (1.2 in) |
| 1942 | 14.0 mm (0.6 in) |
| 1943 | 24.9 mm (1.0 in) |
| 1944 | 18.5 mm (0.7 in) |
| 1945 | 15.5 mm (0.6 in) |
| 1946 | 25.4 mm (1.0 in) |
| 1947 | 19.6 mm (0.8 in) |
| 1948 | 15.7 mm (0.6 in) |
| 1949 | 21.1 mm (0.8 in) |
| 1950 | 18.5 mm (0.7 in) |
| 1951 | 23.6 mm (0.9 in) |
| 1952 | 16.5 mm (0.6 in) |
| 1953 | 16.5 mm (0.6 in) |
| 1954 | 19.6 mm (0.8 in) |
| 1955 | 14.0 mm (0.6 in) |
| 1956 | 36.8 mm (1.4 in) |
| 1957 | 18.8 mm (0.7 in) |
| 1958 | 33.0 mm (1.3 in) |
| 1959 | 14.2 mm (0.6 in) |
| 1960 | 7.1 mm (0.28 in) |
| 1966 | 31.2 mm (1.2 in) |
| 1967 | 18.3 mm (0.7 in) |
| 1968 | 13.7 mm (0.5 in) |
| 1969 | 22.9 mm (0.9 in) |
| 1970 | 47.8 mm (1.9 in) |
| 1971 | 13.5 mm (0.5 in) |
| 1972 | 20.8 mm (0.8 in) |
| 1973 | 17.3 mm (0.7 in) |
| 1974 | 12.7 mm (0.5 in) |
| 1975 | 25.9 mm (1.0 in) |
| 1976 | 15.5 mm (0.6 in) |
| 1977 | 18.0 mm (0.7 in) |
| 1978 | 18.0 mm (0.7 in) |
| 1979 | 27.4 mm (1.1 in) |
| 1980 | 21.3 mm (0.8 in) |
| 1981 | 14.0 mm (0.6 in) |
| 1982 | 25.9 mm (1.0 in) |
| 1983 | 25.7 mm (1.0 in) |
| 1984 | 27.9 mm (1.1 in) |
| 1985 | 36.8 mm (1.4 in) |
| 1986 | 24.9 mm (1.0 in) |
| 1987 | 20.8 mm (0.8 in) |
| 1988 | 11.9 mm (0.5 in) |
| 1989 | 22.4 mm (0.9 in) |
| 1990 | 19.1 mm (0.8 in) |
| 1991 | 26.2 mm (1.0 in) |
| 1992 | 21.1 mm (0.8 in) |
| 1993 | 12.7 mm (0.5 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1938 | 49.2 mm (1.9 in) |
| 1939 | 42.4 mm (1.7 in) |
| 1940 | 39.1 mm (1.5 in) |
| 1941 | 45.7 mm (1.8 in) |
| 1942 | 27.8 mm (1.1 in) |
| 1943 | 30.0 mm (1.2 in) |
| 1944 | 28.0 mm (1.1 in) |
| 1945 | 23.4 mm (0.9 in) |
| 1946 | 35.6 mm (1.4 in) |
| 1947 | 19.6 mm (0.8 in) |
| 1948 | 21.5 mm (0.8 in) |
| 1949 | 33.6 mm (1.3 in) |
| 1950 | 18.8 mm (0.7 in) |
| 1951 | 34.8 mm (1.4 in) |
| 1952 | 28.4 mm (1.1 in) |
| 1953 | 25.4 mm (1.0 in) |
| 1954 | 35.6 mm (1.4 in) |
| 1955 | 19.6 mm (0.8 in) |
| 1956 | 38.1 mm (1.5 in) |
| 1957 | 27.9 mm (1.1 in) |
| 1958 | 33.5 mm (1.3 in) |
| 1959 | 27.6 mm (1.1 in) |
| 1960 | 8.1 mm (0.32 in) |
| 1966 | 41.6 mm (1.6 in) |
| 1967 | 37.4 mm (1.5 in) |
| 1968 | 21.3 mm (0.8 in) |
| 1969 | 30.5 mm (1.2 in) |
| 1970 | 80.6 mm (3.2 in) |
| 1971 | 21.8 mm (0.9 in) |
| 1972 | 20.8 mm (0.8 in) |
| 1973 | 29.2 mm (1.1 in) |
| 1974 | 20.4 mm (0.8 in) |
| 1975 | 37.3 mm (1.5 in) |
| 1976 | 28.5 mm (1.1 in) |
| 1977 | 23.4 mm (0.9 in) |
| 1978 | 18.0 mm (0.7 in) |
| 1979 | 60.3 mm (2.4 in) |
| 1980 | 31.8 mm (1.3 in) |
| 1981 | 27.5 mm (1.1 in) |
| 1982 | 50.6 mm (2.0 in) |
| 1983 | 38.4 mm (1.5 in) |
| 1984 | 48.1 mm (1.9 in) |
| 1985 | 72.4 mm (2.9 in) |
| 1986 | 41.2 mm (1.6 in) |
| 1987 | 32.5 mm (1.3 in) |
| 1988 | 15.0 mm (0.6 in) |
| 1989 | 33.3 mm (1.3 in) |
| 1990 | 29.8 mm (1.2 in) |
| 1991 | 41.4 mm (1.6 in) |
| 1992 | 40.2 mm (1.6 in) |
| 1993 | 19.8 mm (0.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1938 | 34 days |
| 1939 | 34 days |
| 1940 | 55 days |
| 1941 | 32 days |
| 1942 | 67 days |
| 1943 | 39 days |
| 1944 | 44 days |
| 1945 | 61 days |
| 1946 | 45 days |
| 1947 | 49 days |
| 1948 | 92 days |
| 1949 | 51 days |
| 1950 | 58 days |
| 1951 | 47 days |
| 1952 | 90 days |
| 1953 | 34 days |
| 1954 | 27 days |
| 1955 | 49 days |
| 1956 | 35 days |
| 1957 | 32 days |
| 1958 | 63 days |
| 1959 | 36 days |
| 1960 | 30 days |
| 1966 | 25 days |
| 1967 | 45 days |
| 1968 | 53 days |
| 1969 | 46 days |
| 1970 | 30 days |
| 1971 | 39 days |
| 1972 | 104 days |
| 1973 | 43 days |
| 1974 | 87 days |
| 1975 | 74 days |
| 1976 | 90 days |
| 1977 | 29 days |
| 1978 | 43 days |
| 1979 | 53 days |
| 1980 | 42 days |
| 1981 | 30 days |
| 1982 | 28 days |
| 1983 | 27 days |
| 1984 | 44 days |
| 1985 | 28 days |
| 1986 | 31 days |
| 1987 | 48 days |
| 1988 | 47 days |
| 1989 | 28 days |
| 1990 | 21 days |
| 1991 | 30 days |
| 1992 | 30 days |
| 1993 | 19 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
31 years with a frostAcross 31 years with a frost, the median last spring frost at Bonanza falls on 9 May and the median first autumn frost on 6 October, which leaves a median of 148 days between them.
Fitted over all years, the growing season changes by -3.9 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1940 to 1990) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 9 May | n/a | 10 May | n/a | +3.6 days per decade |
| First autumn frost | 6 October | n/a | 6 October | n/a | -0.3 days per decade |
| Growing days | 148 days | n/a | 148 days | n/a | -3.9 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
40 years, 1941 to 1992A day with at least 20.0 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 49.4 mm (1.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 20.0 mm (0.8 in) | |
| 5 years | 26.5 mm (1.0 in) | |
| 10 years | 31.3 mm (1.2 in) | |
| 25 years | 38.0 mm (1.5 in) | |
| 50 years | 43.5 mm (1.7 in) | Longer than the 40 years of record |
| 100 years | 49.4 mm (1.9 in) | Longer than the 40 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, 40 years of values from 1941 to 1992.
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: 47.8 mm (1.9 in) in 1970; 36.8 mm (1.4 in) in 1956; 36.8 mm (1.4 in) in 1985.
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).