Nagano Weather Records (JA000047610)
Record envelope, standing records and threshold days for Nagano (JA000047610), Japan, with 76 years of record.
Key Facts for Nagano
- Nagano (JA000047610) is a weather station in Japan at 36.67 latitude and 138.20 longitude, 419 m (1,375 ft) above sea level.
- The station reports from 1951 to 2026, 76 years of record.
- 1,464 records set at Nagano still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Nagano set a daily record precipitation of 144.5 mm (5.7 in) on 29 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Japan, 36.67 latitude, 138.20 longitude.
- Elevation: 419 m (1,375 ft).
- Period of record: 1951 to 2026, 76 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
10 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 17.7 C (63.9 F) | -15.0 C (5.0 F) | 13.4 C (56.1 F) | -7.3 C (18.9 F) |
| Feb | 21.5 C (70.7 F) | -13.7 C (7.3 F) | 19.5 C (67.1 F) | -7.0 C (19.4 F) |
| Mar | 27.6 C (81.7 F) | -10.9 C (12.4 F) | 16.6 C (61.9 F) | -3.1 C (26.4 F) |
| Apr | 30.6 C (87.1 F) | -4.9 C (23.2 F) | 25.9 C (78.6 F) | 2.4 C (36.3 F) |
| May | 34.2 C (93.6 F) | -0.7 C (30.7 F) | 32.2 C (90.0 F) | 5.0 C (41.0 F) |
| Jun | 35.9 C (96.6 F) | 6.1 C (43.0 F) | 31.9 C (89.4 F) | 11.6 C (52.9 F) |
| Jul | 36.9 C (98.4 F) | 10.7 C (51.3 F) | 35.6 C (96.1 F) | 19.1 C (66.4 F) |
| Aug | 38.7 C (101.7 F) | 10.7 C (51.3 F) | 37.0 C (98.6 F) | 17.9 C (64.2 F) |
| Sep | 36.3 C (97.3 F) | 5.5 C (41.9 F) | 32.9 C (91.2 F) | 15.6 C (60.1 F) |
| Oct | 31.7 C (89.1 F) | -1.9 C (28.6 F) | 24.9 C (76.8 F) | 9.9 C (49.8 F) |
| Nov | 26.2 C (79.2 F) | -11.4 C (11.5 F) | n/a | n/a |
| Dec | 22.0 C (71.6 F) | -11.2 C (11.8 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1951 | 34 |
| 1952 | 14 |
| 1953 | 22 |
| 1954 | 32 |
| 1955 | 12 |
| 1956 | 29 |
| 1957 | 29 |
| 1958 | 21 |
| 1959 | 31 |
| 1960 | 17 |
| 1961 | 26 |
| 1962 | 19 |
| 1963 | 24 |
| 1964 | 20 |
| 1965 | 28 |
| 1966 | 37 |
| 1967 | 18 |
| 1968 | 33 |
| 1969 | 31 |
| 1970 | 24 |
| 1971 | 31 |
| 1972 | 26 |
| 1973 | 24 |
| 1974 | 12 |
| 1975 | 21 |
| 1976 | 31 |
| 1977 | 26 |
| 1978 | 22 |
| 1979 | 25 |
| 1980 | 22 |
| 1981 | 25 |
| 1982 | 26 |
| 1983 | 17 |
| 1984 | 34 |
| 1985 | 21 |
| 1986 | 12 |
| 1987 | 32 |
| 1988 | 16 |
| 1989 | 28 |
| 1990 | 10 |
| 1991 | 11 |
| 1992 | 13 |
| 1993 | 12 |
| 1994 | 21 |
| 1995 | 9 |
| 1996 | 16 |
| 1997 | 17 |
| 1998 | 12 |
| 1999 | 9 |
| 2000 | 11 |
| 2001 | 9 |
| 2002 | 21 |
| 2003 | 15 |
| 2004 | 23 |
| 2006 | 9 |
| 2007 | 12 |
| 2008 | 5 |
| 2009 | 11 |
| 2010 | 12 |
| 2011 | 17 |
| 2012 | 14 |
| 2013 | 12 |
| 2014 | 1 |
| 2015 | 13 |
| 2016 | 12 |
| 2017 | 13 |
| 2018 | 20 |
| 2019 | 18 |
| 2020 | 10 |
| 2021 | 5 |
| 2022 | 19 |
| 2023 | 10 |
| 2024 | 6 |
| 2025 | 47 |
| 2026 | 37 |
All-Time Record Progression
12 new records| Date | Kind | Detail |
|---|---|---|
| 1982-09-12 | Record daily precipitation | Record daily precipitation 114.5 mm (4.5 in) |
| 1990-08-22 | Record high minimum temperature | Record high minimum temperature 27.0 C (80.6 F) |
| 1994-07-30 | Record daily precipitation | Record daily precipitation 228.1 mm (9.0 in) |
| 1994-08-07 | Record high maximum temperature | Record high maximum temperature 36.7 C (98.1 F) |
| 1994-08-11 | Record high maximum temperature | Record high maximum temperature 36.8 C (98.2 F) |
| 1994-08-14 | Record high maximum temperature | Record high maximum temperature 38.2 C (100.8 F) |
| 1994-08-16 | Record high maximum temperature | Record high maximum temperature 38.7 C (101.7 F) |
| 2019-08-14 | Record high minimum temperature | Record high minimum temperature 27.2 C (81.0 F) |
| 2019-08-15 | Record high minimum temperature | Record high minimum temperature 27.6 C (81.7 F) |
| 2026-07-01 | Record daily precipitation | Record daily precipitation 240.5 mm (9.5 in) |
| 2026-07-06 | Record daily precipitation | Record daily precipitation 314.0 mm (12.4 in) |
| 2026-08-06 | Record high minimum temperature | Record high minimum temperature 28.1 C (82.6 F) |
Wettest Day of Each Month
Jul: 314.0 mm (12.4 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 42.5 mm (1.7 in) | 7 January 1963 |
| Feb | 39.6 mm (1.6 in) | 15 February 2014 |
| Mar | 32.0 mm (1.3 in) | 9 March 2018 |
| Apr | 59.9 mm (2.4 in) | 9 April 2024 |
| May | 68.1 mm (2.7 in) | 28 May 2024 |
| Jun | 82.0 mm (3.2 in) | 25 June 1996 |
| Jul | 314.0 mm (12.4 in) | 6 July 2026 |
| Aug | 93.0 mm (3.7 in) | 12 August 2017 |
| Sep | 114.5 mm (4.5 in) | 12 September 1982 |
| Oct | 118.6 mm (4.7 in) | 21 October 2004 |
| Nov | 59.9 mm (2.4 in) | 2 November 2024 |
| Dec | 55.1 mm (2.2 in) | 27 December 2006 |
Period of Record Coverage
1951 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 364 | 100% | Yes |
| 1954 | 359 | 98% | Yes |
| 1955 | 362 | 99% | Yes |
| 1956 | 361 | 99% | Yes |
| 1957 | 362 | 99% | Yes |
| 1958 | 362 | 99% | Yes |
| 1959 | 361 | 99% | Yes |
| 1960 | 363 | 99% | Yes |
| 1961 | 364 | 100% | Yes |
| 1962 | 362 | 99% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 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 |
| 1990 | 340 | 93% | Yes |
| 1991 | 350 | 96% | Yes |
| 1992 | 360 | 98% | Yes |
| 1993 | 351 | 96% | Yes |
| 1994 | 351 | 96% | Yes |
| 1995 | 320 | 88% | No |
| 1996 | 356 | 97% | Yes |
| 1997 | 330 | 90% | Yes |
| 1998 | 350 | 96% | Yes |
| 1999 | 338 | 93% | Yes |
| 2000 | 353 | 96% | Yes |
| 2001 | 306 | 84% | No |
| 2002 | 343 | 94% | Yes |
| 2003 | 350 | 96% | Yes |
| 2004 | 344 | 94% | Yes |
| 2006 | 362 | 99% | Yes |
| 2007 | 358 | 98% | Yes |
| 2008 | 363 | 99% | Yes |
| 2009 | 357 | 98% | Yes |
| 2010 | 355 | 97% | Yes |
| 2011 | 360 | 99% | Yes |
| 2012 | 361 | 99% | Yes |
| 2013 | 123 | 34% | No |
| 2014 | 3 | 1% | No |
| 2015 | 285 | 78% | No |
| 2016 | 330 | 90% | Yes |
| 2017 | 322 | 88% | No |
| 2018 | 341 | 93% | Yes |
| 2019 | 342 | 94% | Yes |
| 2020 | 78 | 21% | No |
| 2021 | 6 | 2% | No |
| 2022 | 152 | 42% | No |
| 2023 | 8 | 2% | No |
| 2024 | 3 | 1% | No |
| 2025 | 360 | 99% | Yes |
| 2026 | 275 | 75% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 29 September 2026 | Nagano, JP | daily rain (Provisional) | 144.5 mm (5.7 in) | 122.9 mm (4.8 in) | 9 years | 49 of 100 (Notable) |
| 27 September 2026 | Nagano, JP | daily rain (Provisional) | 64.0 mm (2.5 in) | 21.5 mm (0.8 in) | 45 years | 35 of 100 (Notable) |
| 20 September 2026 | Nagano, JP | daily rain (Provisional) | 83.0 mm (3.3 in) | 42.1 mm (1.7 in) | 4 years | 37 of 100 (Notable) |
| 15 September 2026 | Nagano, JP | daily rain (Provisional) | 63.0 mm (2.5 in) | 17.9 mm (0.7 in) | 64 years | 38 of 100 (Notable) |
| 14 September 2026 | Nagano, JP | monthly rain (Provisional) | 303.5 mm (11.9 in) | 151.0 mm (5.9 in) | 0 years | 57 of 100 (Notable) |
| 11 September 2026 | Nagano, JP | daily rain (Provisional) | 67.0 mm (2.6 in) | 21.0 mm (0.8 in) | 25 years | 28 of 100 (Routine) |
| 10 September 2026 | Nagano, JP | daily rain (Provisional) | 74.5 mm (2.9 in) | 21.2 mm (0.8 in) | 64 years | 40 of 100 (Notable) |
| 9 September 2026 | Nagano, JP | monthly rain (Provisional) | 152.5 mm (6.0 in) | 22.5 mm (0.9 in) | 0 years | 32 of 100 (Routine) |
| 7 September 2026 | Nagano, JP | daily rain (Tie, Provisional) | 64.0 mm (2.5 in) | tie | 20 years | 3 of 100 (Routine) |
| 6 September 2026 | Nagano, JP | monthly rain (Provisional) | 130.0 mm (5.1 in) | 15.5 mm (0.6 in) | 43 years | 40 of 100 (Notable) |
| 4 September 2026 | Nagano, JP | daily rain (Provisional) | 91.5 mm (3.6 in) | 50.9 mm (2.0 in) | 27 years | 50 of 100 (Notable) |
| 28 August 2026 | Nagano, JP | daily rain (Provisional) | 77.0 mm (3.0 in) | 33.0 mm (1.3 in) | 57 years | 50 of 100 (Notable) |
| 18 August 2026 | Nagano, JP | daily high min (Provisional) | 25.6 C (78.1 F) | 0.4 C (0.7 F) | 51 years | 23 of 100 (Routine) |
| 17 August 2026 | Nagano, JP | daily high min (Provisional) | 24.8 C (76.6 F) | 0.4 C (0.7 F) | 33 years | 18 of 100 (Routine) |
| 7 August 2026 | Nagano, JP | daily high min | 24.4 C (75.9 F) | 0.3 C (0.5 F) | 40 years | 20 of 100 (Routine) |
| 7 August 2026 | Nagano, JP | daily high max | 37.0 C (98.6 F) | 0.3 C (0.5 F) | 32 years | 16 of 100 (Routine) |
| 6 August 2026 | Nagano, JP | all-time high min | 28.1 C (82.6 F) | 0.5 C (0.9 F) | 6 years | 31 of 100 (Routine) |
| 6 August 2026 | Nagano, JP | daily high max | 36.1 C (97.0 F) | 0.4 C (0.7 F) | 7 years | 10 of 100 (Routine) |
| 24 July 2026 | Nagano, JP | daily high min | 25.1 C (77.2 F) | 1.0 C (1.8 F) | 39 years | 22 of 100 (Routine) |
| 23 July 2026 | Nagano, JP | daily high min | 26.1 C (79.0 F) | 1.6 C (2.9 F) | 53 years | 30 of 100 (Routine) |
Climate Trend
40 complete years, 1951 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1951 | 11.7 C | -0.36 C |
| 1952 | 11.7 C | -0.32 C |
| 1953 | 11.6 C | -0.46 C |
| 1954 | 12.2 C | +0.13 C |
| 1955 | 12.5 C | +0.46 C |
| 1956 | 11.8 C | -0.28 C |
| 1957 | 11.8 C | -0.20 C |
| 1958 | 12.4 C | +0.34 C |
| 1959 | 13.0 C | +0.93 C |
| 1960 | 12.5 C | +0.45 C |
| 1961 | 13.0 C | +1.00 C |
| 1962 | 12.4 C | +0.37 C |
| 1963 | 12.0 C | -0.09 C |
| 1964 | 12.4 C | +0.32 C |
| 1965 | 11.3 C | -0.74 C |
| 1966 | 12.0 C | -0.06 C |
| 1967 | 12.0 C | -0.07 C |
| 1968 | 11.9 C | -0.11 C |
| 1969 | 11.6 C | -0.42 C |
| 1970 | 11.6 C | -0.49 C |
| 1971 | 11.6 C | -0.42 C |
| 1972 | 12.4 C | +0.40 C |
| 1973 | 11.9 C | -0.19 C |
| 1974 | 11.3 C | -0.76 C |
| 1975 | 12.0 C | -0.08 C |
| 1976 | 11.3 C | -0.76 C |
| 1977 | 12.0 C | -0.01 C |
| 1978 | 12.1 C | +0.10 C |
| 1979 | 13.0 C | +0.94 C |
| 1980 | 11.6 C | -0.49 C |
| 1981 | 11.1 C | -0.94 C |
| 1982 | 12.2 C | +0.14 C |
| 1983 | 11.8 C | -0.22 C |
| 1984 | 11.3 C | -0.73 C |
| 1985 | 12.2 C | +0.18 C |
| 1986 | 11.6 C | -0.49 C |
| 1987 | 12.7 C | +0.68 C |
| 1988 | 11.5 C | -0.51 C |
| 1989 | 12.7 C | +0.64 C |
| 2025 | 14.2 C | +2.11 C |
The fitted trend in annual mean temperature here over 1951 to 2025 is 0.12 C (-0.02 to 0.25) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.21 F (-0.03 to 0.45) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.12 C (-0.02 to 0.25) per decade | 0.21 F (-0.03 to 0.45) per decade | 1951 to 2025 | 40 | Not clearly different from zero |
| Mean daily maximum | 0.1 C (-0.1 to 0.2) per decade | 0.1 F (-0.2 to 0.4) per decade | 1951 to 2025 | 40 | Not clearly different from zero |
| Mean daily minimum | 0.17 C (0.04 to 0.31) per decade | 0.3 F (0.1 to 0.6) per decade | 1951 to 2025 | 40 | 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
1951 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 38.7 C (101.7 F) | 1994 | 35.3 C (95.5 F) | 75 |
| Coldest night (TNn) | -15.0 C (5.0 F) | 1967 | -10.4 C (13.3 F) | 75 |
| Wettest day (Rx1day) | 314.0 mm (12.4 in) | 2026 | 54.6 mm (2.1 in) | 75 |
| Wettest five days (Rx5day) | 535.0 mm (21.1 in) | 2026 | 92.4 mm (3.6 in) | 73 |
| Longest dry spell (CDD) | 33 days | 1986 | 14 days | 73 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1951 | 36.3 C (97.3 F) |
| 1952 | 34.7 C (94.5 F) |
| 1953 | 35.1 C (95.2 F) |
| 1954 | 35.8 C (96.4 F) |
| 1955 | 35.1 C (95.2 F) |
| 1956 | 34.5 C (94.1 F) |
| 1957 | 35.3 C (95.5 F) |
| 1958 | 33.3 C (91.9 F) |
| 1959 | 33.9 C (93.0 F) |
| 1960 | 34.7 C (94.5 F) |
| 1961 | 35.7 C (96.3 F) |
| 1962 | 36.6 C (97.9 F) |
| 1963 | 35.4 C (95.7 F) |
| 1964 | 34.4 C (93.9 F) |
| 1965 | 35.0 C (95.0 F) |
| 1966 | 34.5 C (94.1 F) |
| 1967 | 33.9 C (93.0 F) |
| 1968 | 33.8 C (92.8 F) |
| 1969 | 33.2 C (91.8 F) |
| 1970 | 35.0 C (95.0 F) |
| 1971 | 35.1 C (95.2 F) |
| 1972 | 35.2 C (95.4 F) |
| 1973 | 34.9 C (94.8 F) |
| 1974 | 33.8 C (92.8 F) |
| 1975 | 35.4 C (95.7 F) |
| 1976 | 34.2 C (93.6 F) |
| 1977 | 35.3 C (95.5 F) |
| 1978 | 36.5 C (97.7 F) |
| 1979 | 36.1 C (97.0 F) |
| 1980 | 32.2 C (90.0 F) |
| 1981 | 34.1 C (93.4 F) |
| 1982 | 33.1 C (91.6 F) |
| 1983 | 34.6 C (94.3 F) |
| 1984 | 36.3 C (97.3 F) |
| 1985 | 36.5 C (97.7 F) |
| 1986 | 34.2 C (93.6 F) |
| 1987 | 35.9 C (96.6 F) |
| 1988 | 33.6 C (92.5 F) |
| 1989 | 33.3 C (91.9 F) |
| 1990 | 35.8 C (96.4 F) |
| 1991 | 35.5 C (95.9 F) |
| 1992 | 35.3 C (95.5 F) |
| 1993 | 33.9 C (93.0 F) |
| 1994 | 38.7 C (101.7 F) |
| 1995 | 35.9 C (96.6 F) |
| 1996 | 36.2 C (97.2 F) |
| 1997 | 35.4 C (95.7 F) |
| 1998 | 35.1 C (95.2 F) |
| 1999 | 36.4 C (97.5 F) |
| 2000 | 36.9 C (98.4 F) |
| 2001 | 35.9 C (96.6 F) |
| 2002 | 36.3 C (97.3 F) |
| 2003 | 36.2 C (97.2 F) |
| 2004 | 35.9 C (96.6 F) |
| 2006 | 36.5 C (97.7 F) |
| 2007 | 36.9 C (98.4 F) |
| 2008 | 36.2 C (97.2 F) |
| 2009 | 35.5 C (95.9 F) |
| 2010 | 35.9 C (96.6 F) |
| 2011 | 36.5 C (97.7 F) |
| 2012 | 35.8 C (96.4 F) |
| 2013 | 27.2 C (81.0 F) |
| 2014 | 35.1 C (95.2 F) |
| 2015 | 36.5 C (97.7 F) |
| 2016 | 36.0 C (96.8 F) |
| 2017 | 35.1 C (95.2 F) |
| 2018 | 37.7 C (99.9 F) |
| 2019 | 36.5 C (97.7 F) |
| 2020 | 23.6 C (74.5 F) |
| 2021 | 30.4 C (86.7 F) |
| 2022 | 36.6 C (97.9 F) |
| 2023 | 31.7 C (89.1 F) |
| 2024 | 25.2 C (77.4 F) |
| 2025 | 36.2 C (97.2 F) |
| 2026 | 37.0 C (98.6 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1951 | -14.5 C (5.9 F) |
| 1952 | -11.5 C (11.3 F) |
| 1953 | -10.8 C (12.6 F) |
| 1954 | -14.2 C (6.4 F) |
| 1955 | -13.3 C (8.1 F) |
| 1956 | -12.6 C (9.3 F) |
| 1957 | -10.9 C (12.4 F) |
| 1958 | -10.8 C (12.6 F) |
| 1959 | -11.3 C (11.7 F) |
| 1960 | -11.2 C (11.8 F) |
| 1961 | -11.7 C (10.9 F) |
| 1962 | -9.6 C (14.7 F) |
| 1963 | -12.5 C (9.5 F) |
| 1964 | -10.5 C (13.1 F) |
| 1965 | -10.5 C (13.1 F) |
| 1966 | -10.5 C (13.1 F) |
| 1967 | -15.0 C (5.0 F) |
| 1968 | -11.9 C (10.6 F) |
| 1969 | -9.9 C (14.2 F) |
| 1970 | -12.6 C (9.3 F) |
| 1971 | -11.4 C (11.5 F) |
| 1972 | -7.2 C (19.0 F) |
| 1973 | -11.5 C (11.3 F) |
| 1974 | -10.8 C (12.6 F) |
| 1975 | -11.2 C (11.8 F) |
| 1976 | -12.3 C (9.9 F) |
| 1977 | -13.3 C (8.1 F) |
| 1978 | -10.8 C (12.6 F) |
| 1979 | -9.6 C (14.7 F) |
| 1980 | -11.0 C (12.2 F) |
| 1981 | -11.3 C (11.7 F) |
| 1982 | -12.3 C (9.9 F) |
| 1983 | -10.0 C (14.0 F) |
| 1984 | -11.0 C (12.2 F) |
| 1985 | -10.6 C (12.9 F) |
| 1986 | -10.0 C (14.0 F) |
| 1987 | -8.7 C (16.3 F) |
| 1988 | -8.8 C (16.2 F) |
| 1989 | -7.9 C (17.8 F) |
| 1990 | -10.4 C (13.3 F) |
| 1991 | -9.0 C (15.8 F) |
| 1992 | -7.3 C (18.9 F) |
| 1993 | -8.1 C (17.4 F) |
| 1994 | -9.5 C (14.9 F) |
| 1995 | -10.3 C (13.5 F) |
| 1996 | -11.3 C (11.7 F) |
| 1997 | -10.2 C (13.6 F) |
| 1998 | -9.7 C (14.5 F) |
| 1999 | -11.6 C (11.1 F) |
| 2000 | -9.3 C (15.3 F) |
| 2001 | -12.0 C (10.4 F) |
| 2002 | -8.7 C (16.3 F) |
| 2003 | -10.3 C (13.5 F) |
| 2004 | -8.9 C (16.0 F) |
| 2006 | -10.5 C (13.1 F) |
| 2007 | -6.6 C (20.1 F) |
| 2008 | -7.9 C (17.8 F) |
| 2009 | -8.9 C (16.0 F) |
| 2010 | -9.7 C (14.5 F) |
| 2011 | -9.2 C (15.4 F) |
| 2012 | -10.4 C (13.3 F) |
| 2013 | -9.6 C (14.7 F) |
| 2014 | -8.7 C (16.3 F) |
| 2015 | -7.6 C (18.3 F) |
| 2016 | -10.0 C (14.0 F) |
| 2017 | -9.6 C (14.7 F) |
| 2018 | -11.1 C (12.0 F) |
| 2019 | -9.5 C (14.9 F) |
| 2020 | -8.8 C (16.2 F) |
| 2021 | -8.0 C (17.6 F) |
| 2022 | -10.4 C (13.3 F) |
| 2023 | -11.6 C (11.1 F) |
| 2024 | -8.3 C (17.1 F) |
| 2025 | -6.5 C (20.3 F) |
| 2026 | -7.3 C (18.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1951 | 30.6 mm (1.2 in) |
| 1952 | 67.8 mm (2.7 in) |
| 1953 | 46.5 mm (1.8 in) |
| 1954 | 42.9 mm (1.7 in) |
| 1955 | 41.4 mm (1.6 in) |
| 1956 | 37.0 mm (1.5 in) |
| 1957 | 69.0 mm (2.7 in) |
| 1958 | 66.1 mm (2.6 in) |
| 1959 | 65.8 mm (2.6 in) |
| 1960 | 49.1 mm (1.9 in) |
| 1961 | 61.2 mm (2.4 in) |
| 1962 | 46.1 mm (1.8 in) |
| 1963 | 76.5 mm (3.0 in) |
| 1964 | 44.5 mm (1.8 in) |
| 1965 | 82.3 mm (3.2 in) |
| 1966 | 56.9 mm (2.2 in) |
| 1967 | 41.4 mm (1.6 in) |
| 1968 | 52.0 mm (2.0 in) |
| 1969 | 54.0 mm (2.1 in) |
| 1970 | 65.5 mm (2.6 in) |
| 1971 | 85.0 mm (3.3 in) |
| 1972 | 34.5 mm (1.4 in) |
| 1973 | 52.0 mm (2.0 in) |
| 1974 | 48.5 mm (1.9 in) |
| 1975 | 50.0 mm (2.0 in) |
| 1976 | 84.0 mm (3.3 in) |
| 1977 | 33.0 mm (1.3 in) |
| 1978 | 41.0 mm (1.6 in) |
| 1979 | 47.5 mm (1.9 in) |
| 1980 | 42.5 mm (1.7 in) |
| 1981 | 82.5 mm (3.2 in) |
| 1982 | 114.5 mm (4.5 in) |
| 1983 | 112.0 mm (4.4 in) |
| 1984 | 44.0 mm (1.7 in) |
| 1985 | 58.5 mm (2.3 in) |
| 1986 | 66.0 mm (2.6 in) |
| 1987 | 28.5 mm (1.1 in) |
| 1988 | 53.5 mm (2.1 in) |
| 1989 | 60.5 mm (2.4 in) |
| 1990 | 36.1 mm (1.4 in) |
| 1991 | 51.1 mm (2.0 in) |
| 1992 | 36.1 mm (1.4 in) |
| 1993 | 39.1 mm (1.5 in) |
| 1994 | 228.1 mm (9.0 in) |
| 1995 | 73.9 mm (2.9 in) |
| 1996 | 82.0 mm (3.2 in) |
| 1997 | 66.0 mm (2.6 in) |
| 1998 | 86.1 mm (3.4 in) |
| 1999 | 62.2 mm (2.4 in) |
| 2000 | 50.8 mm (2.0 in) |
| 2001 | 38.1 mm (1.5 in) |
| 2002 | 61.0 mm (2.4 in) |
| 2003 | 39.1 mm (1.5 in) |
| 2004 | 118.6 mm (4.7 in) |
| 2006 | 102.1 mm (4.0 in) |
| 2007 | 49.0 mm (1.9 in) |
| 2008 | 35.6 mm (1.4 in) |
| 2009 | 54.6 mm (2.1 in) |
| 2010 | 38.1 mm (1.5 in) |
| 2011 | 63.5 mm (2.5 in) |
| 2012 | 51.6 mm (2.0 in) |
| 2013 | 89.9 mm (3.5 in) |
| 2014 | 42.9 mm (1.7 in) |
| 2015 | 42.9 mm (1.7 in) |
| 2016 | 58.9 mm (2.3 in) |
| 2017 | 93.0 mm (3.7 in) |
| 2018 | 81.5 mm (3.2 in) |
| 2019 | 118.1 mm (4.6 in) |
| 2020 | 62.0 mm (2.4 in) |
| 2021 | 85.1 mm (3.4 in) |
| 2022 | 42.9 mm (1.7 in) |
| 2023 | 55.1 mm (2.2 in) |
| 2024 | 68.1 mm (2.7 in) |
| 2025 | 15.0 mm (0.6 in) |
| 2026 | 314.0 mm (12.4 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1951 | 61.2 mm (2.4 in) |
| 1952 | 130.0 mm (5.1 in) |
| 1953 | 83.7 mm (3.3 in) |
| 1954 | 70.1 mm (2.8 in) |
| 1955 | 67.0 mm (2.6 in) |
| 1956 | 78.5 mm (3.1 in) |
| 1957 | 106.2 mm (4.2 in) |
| 1958 | 93.4 mm (3.7 in) |
| 1959 | 106.4 mm (4.2 in) |
| 1960 | 131.9 mm (5.2 in) |
| 1961 | 172.8 mm (6.8 in) |
| 1962 | 122.5 mm (4.8 in) |
| 1963 | 90.9 mm (3.6 in) |
| 1964 | 111.2 mm (4.4 in) |
| 1965 | 114.5 mm (4.5 in) |
| 1966 | 117.3 mm (4.6 in) |
| 1967 | 90.8 mm (3.6 in) |
| 1968 | 72.0 mm (2.8 in) |
| 1969 | 98.0 mm (3.9 in) |
| 1970 | 119.0 mm (4.7 in) |
| 1971 | 122.5 mm (4.8 in) |
| 1972 | 79.0 mm (3.1 in) |
| 1973 | 64.5 mm (2.5 in) |
| 1974 | 107.0 mm (4.2 in) |
| 1975 | 80.0 mm (3.1 in) |
| 1976 | 127.5 mm (5.0 in) |
| 1977 | 50.5 mm (2.0 in) |
| 1978 | 76.5 mm (3.0 in) |
| 1979 | 127.5 mm (5.0 in) |
| 1980 | 68.5 mm (2.7 in) |
| 1981 | 126.0 mm (5.0 in) |
| 1982 | 174.0 mm (6.9 in) |
| 1983 | 143.0 mm (5.6 in) |
| 1984 | 106.5 mm (4.2 in) |
| 1985 | 122.0 mm (4.8 in) |
| 1986 | 68.0 mm (2.7 in) |
| 1987 | 56.0 mm (2.2 in) |
| 1988 | 75.5 mm (3.0 in) |
| 1989 | 94.0 mm (3.7 in) |
| 1990 | 61.1 mm (2.4 in) |
| 1991 | 21.6 mm (0.9 in) |
| 1992 | n/a |
| 1993 | 14.5 mm (0.6 in) |
| 1994 | 36.0 mm (1.4 in) |
| 1995 | 92.4 mm (3.6 in) |
| 1996 | 24.9 mm (1.0 in) |
| 1997 | 50.4 mm (2.0 in) |
| 1998 | 87.1 mm (3.4 in) |
| 1999 | 102.1 mm (4.0 in) |
| 2000 | n/a |
| 2001 | 34.1 mm (1.3 in) |
| 2002 | 50.6 mm (2.0 in) |
| 2003 | 56.6 mm (2.2 in) |
| 2004 | 140.7 mm (5.5 in) |
| 2006 | 191.2 mm (7.5 in) |
| 2007 | 57.4 mm (2.3 in) |
| 2008 | 56.4 mm (2.2 in) |
| 2009 | 74.2 mm (2.9 in) |
| 2010 | 70.4 mm (2.8 in) |
| 2011 | 105.7 mm (4.2 in) |
| 2012 | 94.8 mm (3.7 in) |
| 2013 | 135.9 mm (5.4 in) |
| 2014 | 62.2 mm (2.4 in) |
| 2015 | 95.4 mm (3.8 in) |
| 2016 | 156.4 mm (6.2 in) |
| 2017 | 133.8 mm (5.3 in) |
| 2018 | 111.3 mm (4.4 in) |
| 2019 | 146.3 mm (5.8 in) |
| 2020 | 120.5 mm (4.7 in) |
| 2021 | 173.2 mm (6.8 in) |
| 2022 | 72.6 mm (2.9 in) |
| 2023 | 79.0 mm (3.1 in) |
| 2024 | 82.6 mm (3.3 in) |
| 2025 | 28.0 mm (1.1 in) |
| 2026 | 535.0 mm (21.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1951 | 15 days |
| 1952 | 16 days |
| 1953 | 18 days |
| 1954 | 15 days |
| 1955 | 15 days |
| 1956 | 13 days |
| 1957 | 19 days |
| 1958 | 15 days |
| 1959 | 15 days |
| 1960 | 14 days |
| 1961 | 13 days |
| 1962 | 12 days |
| 1963 | 17 days |
| 1964 | 12 days |
| 1965 | 25 days |
| 1966 | 16 days |
| 1967 | 17 days |
| 1968 | 13 days |
| 1969 | 18 days |
| 1970 | 17 days |
| 1971 | 14 days |
| 1972 | 21 days |
| 1973 | 17 days |
| 1974 | 17 days |
| 1975 | 12 days |
| 1976 | 13 days |
| 1977 | 23 days |
| 1978 | 13 days |
| 1979 | 14 days |
| 1980 | 26 days |
| 1981 | 20 days |
| 1982 | 19 days |
| 1983 | 25 days |
| 1984 | 24 days |
| 1985 | 14 days |
| 1986 | 33 days |
| 1987 | 19 days |
| 1988 | 14 days |
| 1989 | 13 days |
| 1990 | 3 days |
| 1991 | 4 days |
| 1992 | 2 days |
| 1993 | 4 days |
| 1994 | 2 days |
| 1995 | 3 days |
| 1996 | 3 days |
| 1997 | 4 days |
| 1998 | 2 days |
| 1999 | 8 days |
| 2000 | n/a |
| 2001 | n/a |
| 2002 | 4 days |
| 2003 | 8 days |
| 2004 | 17 days |
| 2006 | 16 days |
| 2007 | 15 days |
| 2008 | 18 days |
| 2009 | 15 days |
| 2010 | 10 days |
| 2011 | 14 days |
| 2012 | 11 days |
| 2013 | 28 days |
| 2014 | 13 days |
| 2015 | 14 days |
| 2016 | 16 days |
| 2017 | 18 days |
| 2018 | 26 days |
| 2019 | 14 days |
| 2020 | 20 days |
| 2021 | 11 days |
| 2022 | 13 days |
| 2023 | 22 days |
| 2024 | 11 days |
| 2025 | 8 days |
| 2026 | 12 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
40 years with a frostAcross 40 years with a frost, the median last spring frost at Nagano falls on 13 April and the median first autumn frost on 13 November, which leaves a median of 211 days between them.
Fitted over all years, the growing season changes by +1.8 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1961 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 13 April | n/a | 11 April | n/a | -3.0 days per decade |
| First autumn frost | 13 November | n/a | 12 November | n/a | -1.2 days per decade |
| Growing days | 211 days | n/a | 215 days | n/a | +1.8 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
58 years, 1951 to 2024A day with at least 56.2 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 142.7 mm (5.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 56.2 mm (2.2 in) | |
| 5 years | 76.4 mm (3.0 in) | |
| 10 years | 90.9 mm (3.6 in) | |
| 25 years | 110.5 mm (4.4 in) | |
| 50 years | 126.2 mm (5.0 in) | |
| 100 years | 142.7 mm (5.6 in) | Longer than the 58 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, 58 years of values from 1951 to 2024.
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: 118.6 mm (4.7 in) in 2004; 118.1 mm (4.6 in) in 2019; 114.5 mm (4.5 in) in 1982.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-15).