Shonai Weather Records (JA000047587)
Record envelope, standing records and threshold days for Shonai (JA000047587), Japan, with 56 years of record.
Key Facts for Shonai
- Shonai (JA000047587) is a weather station in Japan at 38.80 latitude and 139.78 longitude, 26 m (85 ft) above sea level.
- The station reports from 1971 to 2026, 56 years of record.
- 1,464 records set at Shonai still stand.
- Records are tracked for no element yet: an element needs 30 years of data to be eligible.
About the Station
- Location: Japan, 38.80 latitude, 139.78 longitude.
- Elevation: 26 m (85 ft).
- Period of record: 1971 to 2026, 56 years.
- Eligible elements: none yet.
Daily Record Envelope and 2026
52 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 14.8 C (58.6 F) | -12.7 C (9.1 F) | 9.9 C (49.8 F) | -3.1 C (26.4 F) |
| Feb | 17.1 C (62.8 F) | -12.8 C (9.0 F) | 9.8 C (49.6 F) | -2.8 C (27.0 F) |
| Mar | 19.1 C (66.4 F) | -9.9 C (14.2 F) | 19.1 C (66.4 F) | -0.1 C (31.8 F) |
| Apr | 28.6 C (83.5 F) | -3.7 C (25.3 F) | 22.6 C (72.7 F) | 3.8 C (38.8 F) |
| May | 30.4 C (86.7 F) | 2.9 C (37.2 F) | 26.0 C (78.8 F) | 6.5 C (43.7 F) |
| Jun | 31.9 C (89.4 F) | 7.5 C (45.5 F) | 31.9 C (89.4 F) | 12.4 C (54.3 F) |
| Jul | 36.1 C (97.0 F) | 9.5 C (49.1 F) | 36.1 C (97.0 F) | 19.3 C (66.7 F) |
| Aug | 40.1 C (104.2 F) | 13.2 C (55.8 F) | 35.9 C (96.6 F) | 20.5 C (68.9 F) |
| Sep | 34.4 C (93.9 F) | 7.0 C (44.6 F) | 32.1 C (89.8 F) | 15.1 C (59.2 F) |
| Oct | 29.4 C (84.9 F) | 1.4 C (34.5 F) | 27.0 C (80.6 F) | 4.0 C (39.2 F) |
| Nov | 23.9 C (75.0 F) | -2.7 C (27.1 F) | 17.9 C (64.2 F) | 2.5 C (36.5 F) |
| Dec | 18.6 C (65.5 F) | -12.5 C (9.5 F) | 17.6 C (63.7 F) | -1.9 C (28.6 F) |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1971 | 68 |
| 1972 | 67 |
| 1973 | 51 |
| 1974 | 57 |
| 1975 | 56 |
| 1976 | 99 |
| 1977 | 91 |
| 1978 | 70 |
| 1979 | 67 |
| 1980 | 84 |
| 1981 | 67 |
| 1982 | 53 |
| 1983 | 50 |
| 1984 | 75 |
| 1985 | 71 |
| 1986 | 49 |
| 1987 | 90 |
| 1988 | 56 |
| 1989 | 73 |
| 2025 | 170 |
Wettest Day of Each Month
Aug: 145.0 mm (5.7 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 35.0 mm (1.4 in) | 6 January 1980 |
| Feb | 54.0 mm (2.1 in) | 11 February 1987 |
| Mar | 38.0 mm (1.5 in) | 20 March 1972 |
| Apr | 42.5 mm (1.7 in) | 28 April 1977 |
| May | 63.0 mm (2.5 in) | 16 May 1983 |
| Jun | 112.0 mm (4.4 in) | 26 June 1978 |
| Jul | 112.0 mm (4.4 in) | 3 July 1971 |
| Aug | 145.0 mm (5.7 in) | 8 August 1977 |
| Sep | 75.5 mm (3.0 in) | 2 September 1973 |
| Oct | 58.5 mm (2.3 in) | 13 October 1973 |
| Nov | 56.0 mm (2.2 in) | 12 November 1982 |
| Dec | 54.5 mm (2.1 in) | 3 December 1973 |
Period of Record Coverage
1971 to 2025| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 2025 | 354 | 97% | Yes |
Latest Records
0No records were set at this station in the latest data.
Climate Trend
20 complete years, 1971 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1971 | 11.5 C | -0.62 C |
| 1972 | 12.5 C | +0.40 C |
| 1973 | 12.2 C | +0.12 C |
| 1974 | 11.4 C | -0.76 C |
| 1975 | 12.1 C | -0.01 C |
| 1976 | 11.1 C | -1.03 C |
| 1977 | 11.6 C | -0.46 C |
| 1978 | 12.1 C | -0.01 C |
| 1979 | 12.6 C | +0.51 C |
| 1980 | 11.4 C | -0.70 C |
| 1981 | 11.4 C | -0.71 C |
| 1982 | 12.2 C | +0.05 C |
| 1983 | 12.0 C | -0.09 C |
| 1984 | 11.5 C | -0.58 C |
| 1985 | 12.4 C | +0.29 C |
| 1986 | 11.8 C | -0.35 C |
| 1987 | 12.7 C | +0.54 C |
| 1988 | 12.0 C | -0.12 C |
| 1989 | 13.2 C | +1.07 C |
| 2025 | 14.5 C | +2.40 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
1971 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.1 C (104.2 F) | 1978 | 34.3 C (93.7 F) | 21 |
| Coldest night (TNn) | -12.8 C (9.0 F) | 1978 | -8.0 C (17.6 F) | 21 |
| Wettest day (Rx1day) | 337.0 mm (13.3 in) | 2026 | 84.0 mm (3.3 in) | 21 |
| Wettest five days (Rx5day) | 627.0 mm (24.7 in) | 2026 | 131.5 mm (5.2 in) | 21 |
| Longest dry spell (CDD) | 24 days | 1989 | 15 days | 21 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1971 | 34.3 C (93.7 F) |
| 1972 | 33.4 C (92.1 F) |
| 1973 | 33.3 C (91.9 F) |
| 1974 | 33.6 C (92.5 F) |
| 1975 | 34.5 C (94.1 F) |
| 1976 | 35.6 C (96.1 F) |
| 1977 | 33.1 C (91.6 F) |
| 1978 | 40.1 C (104.2 F) |
| 1979 | 32.9 C (91.2 F) |
| 1980 | 32.5 C (90.5 F) |
| 1981 | 35.1 C (95.2 F) |
| 1982 | 33.1 C (91.6 F) |
| 1983 | 34.0 C (93.2 F) |
| 1984 | 37.0 C (98.6 F) |
| 1985 | 36.3 C (97.3 F) |
| 1986 | 34.6 C (94.3 F) |
| 1987 | 34.3 C (93.7 F) |
| 1988 | 34.1 C (93.4 F) |
| 1989 | 35.7 C (96.3 F) |
| 2025 | 36.1 C (97.0 F) |
| 2026 | 33.5 C (92.3 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1971 | -12.7 C (9.1 F) |
| 1972 | -5.1 C (22.8 F) |
| 1973 | -5.3 C (22.5 F) |
| 1974 | -9.3 C (15.3 F) |
| 1975 | -11.4 C (11.5 F) |
| 1976 | -12.5 C (9.5 F) |
| 1977 | -12.7 C (9.1 F) |
| 1978 | -12.8 C (9.0 F) |
| 1979 | -6.0 C (21.2 F) |
| 1980 | -8.0 C (17.6 F) |
| 1981 | -10.4 C (13.3 F) |
| 1982 | -9.3 C (15.3 F) |
| 1983 | -9.4 C (15.1 F) |
| 1984 | -9.9 C (14.2 F) |
| 1985 | -7.0 C (19.4 F) |
| 1986 | -6.9 C (19.6 F) |
| 1987 | -5.5 C (22.1 F) |
| 1988 | -6.2 C (20.8 F) |
| 1989 | -4.4 C (24.1 F) |
| 2025 | -3.1 C (26.4 F) |
| 2026 | -3.6 C (25.5 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1971 | 112.0 mm (4.4 in) |
| 1972 | 85.0 mm (3.3 in) |
| 1973 | 75.5 mm (3.0 in) |
| 1974 | 51.5 mm (2.0 in) |
| 1975 | 62.0 mm (2.4 in) |
| 1976 | 98.0 mm (3.9 in) |
| 1977 | 145.0 mm (5.7 in) |
| 1978 | 112.0 mm (4.4 in) |
| 1979 | 68.5 mm (2.7 in) |
| 1980 | 89.0 mm (3.5 in) |
| 1981 | 54.0 mm (2.1 in) |
| 1982 | 96.5 mm (3.8 in) |
| 1983 | 85.0 mm (3.3 in) |
| 1984 | 55.0 mm (2.2 in) |
| 1985 | 69.5 mm (2.7 in) |
| 1986 | 98.5 mm (3.9 in) |
| 1987 | 73.0 mm (2.9 in) |
| 1988 | 63.5 mm (2.5 in) |
| 1989 | 84.0 mm (3.3 in) |
| 2025 | 25.0 mm (1.0 in) |
| 2026 | 337.0 mm (13.3 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1971 | 183.0 mm (7.2 in) |
| 1972 | 177.0 mm (7.0 in) |
| 1973 | 159.5 mm (6.3 in) |
| 1974 | 115.5 mm (4.5 in) |
| 1975 | 87.5 mm (3.4 in) |
| 1976 | 186.5 mm (7.3 in) |
| 1977 | 186.5 mm (7.3 in) |
| 1978 | 160.0 mm (6.3 in) |
| 1979 | 131.5 mm (5.2 in) |
| 1980 | 164.5 mm (6.5 in) |
| 1981 | 109.5 mm (4.3 in) |
| 1982 | 161.0 mm (6.3 in) |
| 1983 | 111.5 mm (4.4 in) |
| 1984 | 126.5 mm (5.0 in) |
| 1985 | 170.0 mm (6.7 in) |
| 1986 | 113.0 mm (4.4 in) |
| 1987 | 125.0 mm (4.9 in) |
| 1988 | 89.0 mm (3.5 in) |
| 1989 | 103.0 mm (4.1 in) |
| 2025 | 60.5 mm (2.4 in) |
| 2026 | 627.0 mm (24.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1971 | 10 days |
| 1972 | 15 days |
| 1973 | 20 days |
| 1974 | 12 days |
| 1975 | 17 days |
| 1976 | 10 days |
| 1977 | 16 days |
| 1978 | 23 days |
| 1979 | 11 days |
| 1980 | 13 days |
| 1981 | 12 days |
| 1982 | 17 days |
| 1983 | 21 days |
| 1984 | 18 days |
| 1985 | 12 days |
| 1986 | 12 days |
| 1987 | 12 days |
| 1988 | 12 days |
| 1989 | 24 days |
| 2025 | 18 days |
| 2026 | 23 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
20 years with a frostAcross 20 years with a frost, the median last spring frost at Shonai falls on 11 April and the median first autumn frost on 24 November, which leaves a median of 229 days between them.
| Measure | Median, all years | Earliest period | Recent period (1971 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 11 April | n/a | 11 April | n/a | n/a |
| First autumn frost | 24 November | n/a | 24 November | n/a | n/a |
| Growing days | 229 days | n/a | 229 days | n/a | n/a |
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.
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).