Reading 4 NNW Threshold Days by Year (USC00367322)

17 fixed thresholds counted per year at Reading 4 NNW (USC00367322): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Reading 4 NNW Thresholds

Reading 4 NNW: days with a maximum temperature at or above 30 C (86 F) in 38 years, most in 1983 with 72.
Reading 4 NNW: days with a maximum temperature at or above 90 F (32.2 C) in 38 years, most in 1983 with 49.
Reading 4 NNW: days with a maximum temperature at or below 0 C (32 F) in 38 years, most in 1977 with 45.
Reading 4 NNW: nights with a minimum temperature at or below 0 C (32 F) in 38 years, most in 1976 with 152.
17 fixed thresholds have at least one qualifying day at Reading 4 NNW.

Days at or above 30 C (86 F)

38 years with a qualifying day

Days per year at Reading 4 NNW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 72 in 1983.

Days at or above 30 C (86 F) per year at Reading 4 NNW
Year	Days	Decade average
1970	61	42.7
1971	35	42.7
1972	35	42.7
1973	49	42.7
1974	42	42.7
1975	48	42.7
1976	29	42.7
1977	44	42.7
1978	44	42.7
1979	40	42.7
1980	65	47.6
1981	23	47.6
1982	32	47.6
1983	72	47.6
1984	51	47.6
1985	59	47.6
1986	55	47.6
1987	41	47.6
1988	52	47.6
1989	26	47.6
1990	34	43.5
1991	59	43.5
1992	17	43.5
1993	49	43.5
1994	34	43.5
1995	49	43.5
1996	35	43.5
1997	40	43.5
1998	56	43.5
1999	62	43.5
2000	36	48.5
2001	43	48.5
2002	59	48.5
2003	29	48.5
2004	36	48.5
2005	63	48.5
2006	57	48.5
2007	65	48.5

For each year, a bar from the first to the last day at Reading 4 NNW meeting 30 C (86 F).

First to last qualifying date each year at Reading 4 NNW
Year	First date	Last date
1970	1970-05-09	1970-09-27
1971	1971-05-20	1971-09-10
1972	1972-05-25	1972-09-27
1973	1973-06-05	1973-09-06
1974	1974-04-30	1974-09-14
1975	1975-05-21	1975-10-15
1976	1976-04-19	1976-09-15
1977	1977-04-13	1977-09-20
1978	1978-05-21	1978-09-19
1979	1979-05-09	1979-10-23
1980	1980-05-06	1980-09-23
1981	1981-05-26	1981-09-15
1982	1982-05-13	1982-09-14
1983	1983-04-29	1983-10-06
1984	1984-06-05	1984-09-26
1985	1985-04-20	1985-09-20
1986	1986-05-06	1986-10-04
1987	1987-05-10	1987-08-20
1988	1988-05-23	1988-08-28
1989	1989-05-20	1989-09-11
1990	1990-04-27	1990-09-03
1991	1991-05-13	1991-09-18
1992	1992-05-23	1992-08-28
1993	1993-05-10	1993-09-05
1994	1994-04-26	1994-08-14
1995	1995-05-25	1995-09-15
1996	1996-05-20	1996-09-10
1997	1997-05-20	1997-10-07
1998	1998-03-31	1998-09-28
1999	1999-05-30	1999-09-09
2000	2000-05-06	2000-09-10
2001	2001-04-24	2001-09-09
2002	2002-04-17	2002-10-03
2003	2003-04-17	2003-08-26
2004	2004-04-20	2004-09-05
2005	2005-05-12	2005-09-23
2006	2006-05-29	2006-09-10
2007	2007-05-16	2007-10-10

Every Fixed Threshold

Fixed thresholds at Reading 4 NNW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	38	72	1983	65
35 C (95 F): Days	27	19	1999	7
90 F (32.2 C): Days	38	49	1983	38
100 F (37.8 C): Days	5	5	1999	2
0 C (32 F): Ice days (max	38	45	1977	21
0 C (32 F): Frost days (min	38	152	1976	104
-10 C (14 F): Days with min	38	49	1977	15
-20 C (-4 F): Days with min	13	5	1981	2
20 C (68 F): Tropical nights (min	38	49	2005	30
25 C (77 F): Days with min	5	3	1999	2
10 mm (0.39 in): Days with 10 mm or more rain	37	50	1975	35
25 mm (0.98 in): Days with 25 mm or more rain	37	19	1972	14
50 mm (1.97 in): Days with 50 mm or more rain	32	7	1979	1
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1972	1
10 cm (3.9 in): Days with 10 cm or more snowfall	18	7	1994	2
25 cm (9.8 in): Days with 25 cm or more snowfall	7	2	2003	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	2003	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1970.

Download the Data

Data for Reading 4 NNW threshold days by year: CSV or JSON. Field meanings are on the data page.

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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Reading 4 NNW Threshold Days by Year (USC00367322)

Key Facts for Reading 4 NNW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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