Rockville 5 N Threshold Days by Year (USC00357277)
16 fixed thresholds counted per year at Rockville 5 N (USC00357277): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Rockville 5 N Thresholds
- Rockville 5 N: days with a maximum temperature at or above 30 C (86 F) in 49 years, most in 1966 with 83.
- Rockville 5 N: days with a maximum temperature at or above 35 C (95 F) in 49 years, most in 1988 with 31.
- Rockville 5 N: days with a maximum temperature at or above 90 F (32.2 C) in 49 years, most in 2007 with 63.
- Rockville 5 N: days with a maximum temperature at or below 0 C (32 F) in 49 years, most in 1985 with 61.
- 16 fixed thresholds have at least one qualifying day at Rockville 5 N.
Days at or above 30 C (86 F)
49 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1964 | 46 | 55.2 |
| 1965 | 32 | 55.2 |
| 1966 | 83 | 55.2 |
| 1967 | 68 | 55.2 |
| 1968 | 58 | 55.2 |
| 1969 | 44 | 55.2 |
| 1970 | 60 | 56.3 |
| 1971 | 55 | 56.3 |
| 1972 | 55 | 56.3 |
| 1973 | 70 | 56.3 |
| 1974 | 70 | 56.3 |
| 1975 | 43 | 56.3 |
| 1976 | 45 | 56.3 |
| 1977 | 72 | 56.3 |
| 1978 | 38 | 56.3 |
| 1979 | 55 | 56.3 |
| 1980 | 37 | 53.3 |
| 1981 | 57 | 53.3 |
| 1982 | 51 | 53.3 |
| 1983 | 35 | 53.3 |
| 1984 | 56 | 53.3 |
| 1985 | 54 | 53.3 |
| 1986 | 66 | 53.3 |
| 1987 | 54 | 53.3 |
| 1988 | 73 | 53.3 |
| 1989 | 50 | 53.3 |
| 1990 | 64 | 55.4 |
| 1991 | 61 | 55.4 |
| 1992 | 65 | 55.4 |
| 1993 | 20 | 55.4 |
| 1994 | 75 | 55.4 |
| 1995 | 47 | 55.4 |
| 1996 | 55 | 55.4 |
| 1997 | 49 | 55.4 |
| 1998 | 65 | 55.4 |
| 1999 | 53 | 55.4 |
| 2000 | 68 | 66.6 |
| 2001 | 70 | 66.6 |
| 2002 | 57 | 66.6 |
| 2003 | 79 | 66.6 |
| 2004 | 51 | 66.6 |
| 2005 | 65 | 66.6 |
| 2006 | 73 | 66.6 |
| 2007 | 75 | 66.6 |
| 2008 | 68 | 66.6 |
| 2009 | 60 | 66.6 |
| 2010 | 52 | 66.7 |
| 2011 | 74 | 66.7 |
| 2012 | 74 | 66.7 |
| Year | First date | Last date |
|---|---|---|
| 1964 | 1964-05-19 | 1964-08-26 |
| 1965 | 1965-06-10 | 1965-10-02 |
| 1966 | 1966-05-03 | 1966-09-24 |
| 1967 | 1967-05-17 | 1967-09-22 |
| 1968 | 1968-06-01 | 1968-09-13 |
| 1969 | 1969-06-02 | 1969-09-27 |
| 1970 | 1970-05-16 | 1970-10-04 |
| 1971 | 1971-06-20 | 1971-09-11 |
| 1972 | 1972-05-29 | 1972-09-04 |
| 1973 | 1973-05-13 | 1973-09-12 |
| 1974 | 1974-05-26 | 1974-09-26 |
| 1975 | 1975-06-05 | 1975-09-12 |
| 1976 | 1976-05-13 | 1976-09-06 |
| 1977 | 1977-04-23 | 1977-09-11 |
| 1978 | 1978-06-06 | 1978-09-26 |
| 1979 | 1979-05-26 | 1979-09-22 |
| 1980 | 1980-05-21 | 1980-09-10 |
| 1981 | 1981-06-22 | 1981-09-19 |
| 1982 | 1982-05-25 | 1982-09-10 |
| 1983 | 1983-05-25 | 1983-09-13 |
| 1984 | 1984-05-29 | 1984-09-19 |
| 1985 | 1985-06-12 | 1985-08-29 |
| 1986 | 1986-05-25 | 1986-09-08 |
| 1987 | 1987-04-27 | 1987-09-24 |
| 1988 | 1988-05-12 | 1988-09-15 |
| 1989 | 1989-06-07 | 1989-08-30 |
| 1990 | 1990-06-09 | 1990-09-14 |
| 1991 | 1991-06-10 | 1991-09-07 |
| 1992 | 1992-05-06 | 1992-10-02 |
| 1993 | 1993-05-11 | 1993-09-11 |
| 1994 | 1994-05-09 | 1994-09-18 |
| 1995 | 1995-06-24 | 1995-09-13 |
| 1996 | 1996-06-03 | 1996-09-12 |
| 1997 | 1997-05-13 | 1997-10-01 |
| 1998 | 1998-06-29 | 1998-09-18 |
| 1999 | 1999-05-24 | 1999-08-30 |
| 2000 | 2000-05-21 | 2000-09-14 |
| 2001 | 2001-05-11 | 2001-09-24 |
| 2002 | 2002-05-29 | 2002-09-16 |
| 2003 | 2003-05-23 | 2003-09-07 |
| 2004 | 2004-06-03 | 2004-09-01 |
| 2005 | 2005-06-20 | 2005-09-08 |
| 2006 | 2006-05-15 | 2006-09-13 |
| 2007 | 2007-05-12 | 2007-09-12 |
| 2008 | 2008-05-16 | 2008-08-29 |
| 2009 | 2009-05-17 | 2009-09-26 |
| 2010 | 2010-06-23 | 2010-09-28 |
| 2011 | 2011-06-21 | 2011-09-30 |
| 2012 | 2012-05-16 | 2012-09-15 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 49 | 83 | 1966 | 74 |
| 35 C (95 F): Days | 49 | 31 | 1988 | 22 |
| 40 C (104 F): Days | 2 | 3 | 2002 | 2 |
| 90 F (32.2 C): Days | 49 | 63 | 2007 | 52 |
| 100 F (37.8 C): Days | 28 | 9 | 2003 | 3 |
| 0 C (32 F): Ice days (max | 49 | 61 | 1985 | 6 |
| 0 C (32 F): Frost days (min | 49 | 218 | 1973 | 192 |
| -10 C (14 F): Days with min | 49 | 75 | 1985 | 27 |
| -20 C (-4 F): Days with min | 36 | 18 | 1985 | 1 |
| -30 C (-22 F): Days with min | 6 | 5 | 1990 | 5 |
| 20 C (68 F): Tropical nights (min | 10 | 2 | 1983 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 48 | 16 | 1981 | 2 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 17 | 3 | 1987 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 2 | 1 | 1987 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 35 | 5 | 1996 | 3 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 1 | 1980 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1964.
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). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).