Upper Marlboro 3 NNW Threshold Days by Year (USC00189070)
18 fixed thresholds counted per year at Upper Marlboro 3 NNW (USC00189070): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Upper Marlboro 3 NNW Thresholds
- Upper Marlboro 3 NNW: days with a maximum temperature at or above 30 C (86 F) in 54 years, most in 2010 with 87.
- Upper Marlboro 3 NNW: days with a maximum temperature at or above 90 F (32.2 C) in 54 years, most in 2010 with 63.
- Upper Marlboro 3 NNW: days with a maximum temperature at or below 0 C (32 F) in 54 years, most in 1977 with 30.
- Upper Marlboro 3 NNW: nights with a minimum temperature at or below 0 C (32 F) in 54 years, most in 1976 with 133.
- 18 fixed thresholds have at least one qualifying day at Upper Marlboro 3 NNW.
Days at or above 30 C (86 F)
54 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1957 | 79 | 67.7 |
| 1958 | 52 | 67.7 |
| 1959 | 72 | 67.7 |
| 1960 | 46 | 55.4 |
| 1961 | 61 | 55.4 |
| 1962 | 55 | 55.4 |
| 1963 | 49 | 55.4 |
| 1964 | 58 | 55.4 |
| 1965 | 58 | 55.4 |
| 1966 | 65 | 55.4 |
| 1967 | 40 | 55.4 |
| 1968 | 57 | 55.4 |
| 1969 | 65 | 55.4 |
| 1970 | 68 | 53.7 |
| 1971 | 46 | 53.7 |
| 1972 | 38 | 53.7 |
| 1973 | 60 | 53.7 |
| 1974 | 51 | 53.7 |
| 1975 | 54 | 53.7 |
| 1976 | 60 | 53.7 |
| 1977 | 68 | 53.7 |
| 1978 | 53 | 53.7 |
| 1979 | 39 | 53.7 |
| 1980 | 73 | 60.4 |
| 1981 | 43 | 60.4 |
| 1982 | 42 | 60.4 |
| 1983 | 70 | 60.4 |
| 1984 | 48 | 60.4 |
| 1985 | 57 | 60.4 |
| 1986 | 72 | 60.4 |
| 1987 | 70 | 60.4 |
| 1988 | 69 | 60.4 |
| 1990 | 56 | 63.8 |
| 1991 | 84 | 63.8 |
| 1996 | 52 | 63.8 |
| 1997 | 50 | 63.8 |
| 1998 | 81 | 63.8 |
| 1999 | 60 | 63.8 |
| 2000 | 40 | 58.8 |
| 2001 | 48 | 58.8 |
| 2002 | 73 | 58.8 |
| 2003 | 43 | 58.8 |
| 2004 | 55 | 58.8 |
| 2005 | 79 | 58.8 |
| 2006 | 50 | 58.8 |
| 2007 | 84 | 58.8 |
| 2008 | 63 | 58.8 |
| 2009 | 53 | 58.8 |
| 2010 | 87 | 68.8 |
| 2011 | 70 | 68.8 |
| 2012 | 74 | 68.8 |
| 2013 | 60 | 68.8 |
| 2014 | 43 | 68.8 |
| 2015 | 79 | 68.8 |
| Year | First date | Last date |
|---|---|---|
| 1957 | 1957-04-22 | 1957-09-23 |
| 1958 | 1958-05-05 | 1958-10-11 |
| 1959 | 1959-04-09 | 1959-10-07 |
| 1960 | 1960-04-15 | 1960-09-10 |
| 1961 | 1961-04-26 | 1961-09-26 |
| 1962 | 1962-04-23 | 1962-10-13 |
| 1963 | 1963-04-03 | 1963-09-21 |
| 1964 | 1964-04-18 | 1964-09-12 |
| 1965 | 1965-05-04 | 1965-09-24 |
| 1966 | 1966-05-07 | 1966-09-06 |
| 1967 | 1967-04-03 | 1967-10-06 |
| 1968 | 1968-05-04 | 1968-10-04 |
| 1969 | 1969-04-28 | 1969-09-18 |
| 1970 | 1970-05-10 | 1970-09-27 |
| 1971 | 1971-05-20 | 1971-09-11 |
| 1972 | 1972-04-20 | 1972-09-27 |
| 1973 | 1973-04-23 | 1973-09-30 |
| 1974 | 1974-04-29 | 1974-09-14 |
| 1975 | 1975-05-21 | 1975-10-16 |
| 1976 | 1976-04-17 | 1976-09-15 |
| 1977 | 1977-04-12 | 1977-09-21 |
| 1978 | 1978-04-02 | 1978-09-20 |
| 1979 | 1979-03-31 | 1979-09-15 |
| 1980 | 1980-05-06 | 1980-09-24 |
| 1981 | 1981-04-29 | 1981-10-02 |
| 1982 | 1982-05-13 | 1982-09-19 |
| 1983 | 1983-04-29 | 1983-10-05 |
| 1984 | 1984-05-20 | 1984-10-29 |
| 1985 | 1985-04-20 | 1985-09-11 |
| 1986 | 1986-05-02 | 1986-10-03 |
| 1987 | 1987-05-11 | 1987-09-18 |
| 1988 | 1988-05-24 | 1988-09-24 |
| 1990 | 1990-03-13 | 1990-10-10 |
| 1991 | 1991-04-08 | 1991-09-19 |
| 1996 | 1996-04-23 | 1996-09-11 |
| 1997 | 1997-05-20 | 1997-10-07 |
| 1998 | 1998-03-30 | 1998-10-01 |
| 1999 | 1999-06-01 | 1999-09-10 |
| 2000 | 2000-05-06 | 2000-10-05 |
| 2001 | 2001-04-10 | 2001-09-11 |
| 2002 | 2002-04-17 | 2002-10-06 |
| 2003 | 2003-04-17 | 2003-09-02 |
| 2004 | 2004-04-19 | 2004-09-24 |
| 2005 | 2005-04-07 | 2005-09-24 |
| 2006 | 2006-05-29 | 2006-08-30 |
| 2007 | 2007-04-24 | 2007-10-10 |
| 2008 | 2008-04-19 | 2008-09-15 |
| 2009 | 2009-04-26 | 2009-10-10 |
| 2010 | 2010-04-07 | 2010-10-12 |
| 2011 | 2011-04-05 | 2011-09-15 |
| 2012 | 2012-04-17 | 2012-09-09 |
| 2013 | 2013-04-11 | 2013-10-07 |
| 2014 | 2014-05-09 | 2014-09-12 |
| 2015 | 2015-05-06 | 2015-09-20 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 54 | 87 | 2010 | 79 |
| 35 C (95 F): Days | 44 | 27 | 2002 | 2 |
| 40 C (104 F): Days | 1 | 2 | 2012 | 2 |
| 90 F (32.2 C): Days | 54 | 63 | 2010 | 34 |
| 100 F (37.8 C): Days | 14 | 7 | 1988 | 6 |
| 0 C (32 F): Ice days (max | 54 | 30 | 1977 | 14 |
| 0 C (32 F): Frost days (min | 54 | 133 | 1976 | 102 |
| -10 C (14 F): Days with min | 54 | 35 | 1977 | 23 |
| -20 C (-4 F): Days with min | 14 | 5 | 1979 | 2 |
| 20 C (68 F): Tropical nights (min | 54 | 63 | 2010 | 45 |
| 25 C (77 F): Days with min | 12 | 3 | 2010 | 2 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 54 | 53 | 2003 | 38 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 54 | 21 | 1983 | 13 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 42 | 4 | 1960 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 10 | 2 | 1975 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 38 | 5 | 1967 | 5 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 11 | 2 | 1987 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 1 | 1 | 1979 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1957.
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).