Zortman Threshold Days by Year (USC00249900)

16 fixed thresholds counted per year at Zortman (USC00249900): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Zortman Thresholds

Zortman: nights with a minimum temperature at or below 0 C (32 F) in 32 years, most in 1969 with 196.
Zortman: nights with a minimum temperature at or below -10 C (14 F) in 32 years, most in 1969 with 97.
Zortman: nights with a minimum temperature at or below -20 C (-4 F) in 32 years, most in 1972 with 40.
Zortman: days with a maximum temperature at or above 30 C (86 F) in 31 years, most in 1971 with 34.
16 fixed thresholds have at least one qualifying day at Zortman.

Days at or above 30 C (86 F)

31 years with a qualifying day

Days per year at Zortman with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 34 in 1971.

Days at or above 30 C (86 F) per year at Zortman
Year	Days	Decade average
1966	28	20.8
1967	26	20.8
1968	12	20.8
1969	17	20.8
1970	28	18.8
1971	34	18.8
1972	9	18.8
1976	17	18.8
1977	15	18.8
1978	10	18.8
1993	4	4
2002	14	18.4
2004	8	18.4
2005	21	18.4
2006	33	18.4
2007	28	18.4
2008	14	18.4
2009	11	18.4
2011	21	19.6
2012	28	19.6
2013	18	19.6
2014	18	19.6
2015	21	19.6
2016	8	19.6
2017	31	19.6
2018	19	19.6
2019	12	19.6
2020	17	24.5
2021	30	24.5
2022	33	24.5
2023	18	24.5

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

First to last qualifying date each year at Zortman
Year	First date	Last date
1966	1966-05-06	1966-09-11
1967	1967-07-14	1967-09-29
1968	1968-06-19	1968-09-11
1969	1969-07-11	1969-09-11
1970	1970-06-22	1970-08-27
1971	1971-06-23	1971-09-12
1972	1972-05-30	1972-08-29
1976	1976-07-04	1976-09-17
1977	1977-06-01	1977-08-24
1978	1978-07-25	1978-09-05
1993	1993-06-21	1993-08-10
2002	2002-06-28	2002-09-16
2004	2004-07-15	2004-09-02
2005	2005-06-22	2005-09-04
2006	2006-05-19	2006-09-07
2007	2007-06-30	2007-09-05
2008	2008-07-01	2008-08-26
2009	2009-06-26	2009-09-20
2011	2011-06-29	2011-10-01
2012	2012-06-30	2012-09-10
2013	2013-07-03	2013-09-11
2014	2014-07-05	2014-09-26
2015	2015-06-27	2015-09-26
2016	2016-06-09	2016-09-02
2017	2017-06-05	2017-09-10
2018	2018-07-07	2018-08-18
2019	2019-07-14	2019-09-17
2020	2020-06-14	2020-09-06
2021	2021-06-04	2021-09-19
2022	2022-06-18	2022-09-08
2023	2023-07-10	2023-09-04

Every Fixed Threshold

Fixed thresholds at Zortman
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	31	34	1971	18
35 C (95 F): Days	17	10	1971	1
90 F (32.2 C): Days	29	22	1971	8
100 F (37.8 C): Days	2	1	1971	1
0 C (32 F): Ice days (max	31	78	1978	51
0 C (32 F): Frost days (min	32	196	1969	166
-10 C (14 F): Days with min	32	97	1969	50
-20 C (-4 F): Days with min	32	40	1972	7
-30 C (-22 F): Days with min	21	11	1972	2
20 C (68 F): Tropical nights (min	8	2	1970	1
10 mm (0.39 in): Days with 10 mm or more rain	27	22	1993	11
25 mm (0.98 in): Days with 25 mm or more rain	25	10	2016	3
50 mm (1.97 in): Days with 50 mm or more rain	13	3	2013	2
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1969	1
10 cm (3.9 in): Days with 10 cm or more snowfall	19	11	2019	2
25 cm (9.8 in): Days with 25 cm or more snowfall	6	2	2016	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1966.

Download the Data

Data for Zortman 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Zortman Threshold Days by Year (USC00249900)

Key Facts for Zortman Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related