Rend Lake Dam Threshold Days by Year (USC00117187)

17 fixed thresholds counted per year at Rend Lake Dam (USC00117187): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rend Lake Dam Thresholds

Rend Lake Dam: days with 10 mm (0.39 in) or more of precipitation in 31 years, most in 2020 with 51.
Rend Lake Dam: days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 1983 with 19.
Rend Lake Dam: days with 50 mm (1.97 in) or more of precipitation in 27 years, most in 1983 with 6.
Rend Lake Dam: days with a maximum temperature at or above 30 C (86 F) in 15 years, most in 1983 with 94.
17 fixed thresholds have at least one qualifying day at Rend Lake Dam.

Days at or above 30 C (86 F)

15 years with a qualifying day

Days per year at Rend Lake Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 94 in 1983.

Days at or above 30 C (86 F) per year at Rend Lake Dam
Year	Days	Decade average
1975	82	74.2
1976	58	74.2
1977	82	74.2
1978	84	74.2
1979	65	74.2
1981	68	74.2
1982	56	74.2
1983	94	74.2
1984	82	74.2
1985	69	74.2
1986	76	74.2
2018	79	79
2020	62	47
2021	72	47
2026	7	47

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

First to last qualifying date each year at Rend Lake Dam
Year	First date	Last date
1975	1975-05-20	1975-10-14
1976	1976-04-24	1976-10-05
1977	1977-04-17	1977-09-19
1978	1978-04-10	1978-09-21
1979	1979-05-09	1979-10-22
1981	1981-04-11	1981-10-06
1982	1982-05-06	1982-10-07
1983	1983-06-06	1983-10-04
1984	1984-04-28	1984-09-22
1985	1985-05-13	1985-10-19
1986	1986-04-26	1986-10-05
2018	2018-05-09	2018-10-08
2020	2020-04-08	2020-10-07
2021	2021-05-20	2021-10-10
2026	2026-03-21	2026-05-29

Every Fixed Threshold

Fixed thresholds at Rend Lake Dam
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	15	94	1983	7
35 C (95 F): Days	13	29	1983	4
90 F (32.2 C): Days	14	65	1983	25
100 F (37.8 C): Days	5	8	1983	1
0 C (32 F): Ice days (max	15	46	1978	7
0 C (32 F): Frost days (min	11	114	1979	38
-10 C (14 F): Days with min	11	45	1977	9
-20 C (-4 F): Days with min	6	8	1977	2
20 C (68 F): Tropical nights (min	11	72	2018	5
25 C (77 F): Days with min	5	2	1981	1
10 mm (0.39 in): Days with 10 mm or more rain	31	51	2020	8
25 mm (0.98 in): Days with 25 mm or more rain	31	19	1983	3
50 mm (1.97 in): Days with 50 mm or more rain	27	6	1983	1
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1977	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1993	1
10 cm (3.9 in): Days with 10 cm or more snowfall	4	1	1982	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	2004	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1975.

Download the Data

Data for Rend Lake Dam 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Rend Lake Dam Threshold Days by Year (USC00117187)

Key Facts for Rend Lake Dam Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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