Tropical nights in United States

Tropical nights in United States: 30.5 nights in 1950 and 39.8 nights in 2014, in the CMIP6 climate models’ median run.

Latest, 2014: 39.8 nights; Modelled
Since 1950: +9.3 nights
Projected, 2100: 63.9 nights; CMIP6 model median (SSP2-4.5, middle of the road)

Watch it change on the map

nights a year · CMIP6

CMIP6 historical run, model medianCMIP6 model median (SSP2-4.5, middle of the road)models’ 10th–90th percentile

What the numbers say

The CMIP6 model median (SSP2-4.5, middle of the road) puts it at 63.9 nights in 2100, between 50.3 nights and 80.2 nights (models’ 10th–90th percentile).
The highest was 39.8 nights in 2014, the lowest 28.1 nights in 1964.

Every year

nights a year · CMIP6

Year	United States
2014	39.8
2013	38.9
2012	38.7
2011	38.4
2010	38.3
2009	37.5
2008	36.8
2007	37.7
2006	37.6
2005	36.8
2004	35.8
2003	36
2002	37.7
2001	36.7
2000	35.5
1999	36.1
1998	34.8
1997	35.1
1996	33.6
1995	33.6
1994	32.4
1993	30.9
1992	29.4
1991	33.7
1990	33.8
1989	32.9
1988	33
1987	32.1
1986	31.5
1985	32
1984	30.1
1983	28.4
1982	30.8
1981	32.9
1980	30.7
1979	32.1
1978	31.6
1977	31.6
1976	29.7
1975	31.1
1974	29.8
1973	29.9
1972	30.7
1971	30
1970	29.7
1969	30.4
1968	29.5
1967	29.7
1966	29.1
1965	28.6
1964	28.1
1963	30
1962	30.8
1961	31.9
1960	31.1
1959	31
1958	30.6
1957	31
1956	32
1955	30.7
1954	30.8
1953	31.3
1952	30.6
1951	30.7
1950	30.5

CMIP6 model median (SSP2-4.5, middle of the road) · 2015–2100

Year	United States
2015	40.932.9–49.8
2016	41.933.3–52
2017	4234–50.6
2018	4333.9–52.5
2019	43.234.3–52.6
2020	42.833.9–53.1
2021	42.833.8–52.7
2022	43.634.5–52.3
2023	44.535–55.5
2024	44.935.9–54.5
2025	4636.7–55.5
2026	44.735.6–54.8
2027	46.437.3–58.4
2028	45.836.5–56.6
2029	46.936.9–57.7
2030	46.936.6–58.8
2031	46.337–55.7
2032	46.236.9–56.5
2033	49.439.1–60.3
2034	47.738.7–58.6
2035	47.737.5–59.6
2036	49.439.2–61.8
2037	48.639.1–59.8
2038	50.240.4–59.8
2039	50.240.5–60.9
2040	50.739.8–61.8
2041	49.840.1–61.2
2042	51.441–63.1
2043	51.341.4–62.2
2044	51.340.5–63.3
2045	52.441.5–64.7
2046	53.343.3–64.1
2047	53.844.1–66.5
2048	53.542.2–66
2049	53.743.2–65.9
2050	54.943–67.2
2051	54.743.5–67.5
2052	53.642–66.1
2053	54.342.4–66.8
2054	54.543.1–67
2055	55.142.4–68
2056	55.844.3–70
2057	56.244.6–68.1
2058	56.144.4–70.4
2059	55.544.5–67.9
2060	56.144.9–68.3
2061	5746–69
2062	57.443.9–70.3
2063	57.244.7–70.8
2064	5643–68.2
2065	56.544.2–71
2066	58.747.4–71.2
2067	58.647.2–71.4
2068	58.846.1–71.7
2069	59.646.8–73
2070	57.944.7–72.8
2071	5946.5–72
2072	58.746.4–72.9
2073	59.345.8–72.1
2074	60.546.4–74.6
2075	59.846.6–75.3
2076	59.647.5–74.4
2077	60.147.9–74.3
2078	60.747–76
2079	61.148.3–76.2
2080	61.448.8–76.8
2081	6149.2–74.7
2082	61.748.1–75.9
2083	62.849.6–77.6
2084	62.248.1–76.8
2085	6247.9–76
2086	6449–78.8
2087	63.349.5–77.3
2088	63.148.2–78.4
2089	61.648.8–76.6
2090	64.950.6–79
2091	64.750–78.6
2092	6448.1–79
2093	64.350.1–80.2
2094	63.248.2–78.9
2095	64.149.8–79.8
2096	6549.9–79.6
2097	63.347.3–81.2
2098	64.349.7–79.2
2099	64.350.3–79.5
2100	63.950.3–80.2

Good to know

Nights in a year when the temperature stays above 20 °C, averaged over the country.
Source: World Bank Climate Change Knowledge Portal, CMIP6 multi-model median.
The dashed line is the CMIP6 model median (SSP2-4.5, middle of the road), a scenario rather than a forecast; the band is its models’ 10th–90th percentile.
Climate model values are the median of the CMIP6 models, run on past emissions to 2014 and on SSP2-4.5, a middle-of-the-road path, after: they are not measurements.

How the layers work, where their data comes from and what they can’t tell you: Countries through time

Tropical nights in United States

What the numbers say

Every year

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