Helvetia Santa Rita Rn Threshold Days by Year (USC00023981)

15 fixed thresholds counted per year at Helvetia Santa Rita Rn (USC00023981): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Helvetia Santa Rita Rn Thresholds

Helvetia Santa Rita Rn: days with 10 mm (0.39 in) or more of precipitation in 29 years, most in 1931 with 28.
Helvetia Santa Rita Rn: days with 25 mm (0.98 in) or more of precipitation in 29 years, most in 1931 with 13.
Helvetia Santa Rita Rn: nights with a minimum temperature at or below 0 C (32 F) in 27 years, most in 1918 with 55.
Helvetia Santa Rita Rn: nights with a minimum temperature at or above 20 C (68 F) in 27 years, most in 1933 with 66.
15 fixed thresholds have at least one qualifying day at Helvetia Santa Rita Rn.

Days at or above 30 C (86 F)

26 years with a qualifying day

Days per year at Helvetia Santa Rita Rn with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 136 in 1918.

Days at or above 30 C (86 F) per year at Helvetia Santa Rita Rn
Year	Days	Decade average
1917	133	123.7
1918	136	123.7
1919	102	123.7
1926	118	113.7
1928	122	113.7
1929	101	113.7
1930	113	101.1
1931	59	101.1
1932	111	101.1
1933	116	101.1
1934	124	101.1
1935	88	101.1
1936	112	101.1
1937	108	101.1
1938	87	101.1
1939	93	101.1
1940	102	101.7
1941	92	101.7
1942	109	101.7
1943	104	101.7
1944	97	101.7
1945	81	101.7
1946	97	101.7
1947	111	101.7
1948	117	101.7
1949	107	101.7

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

First to last qualifying date each year at Helvetia Santa Rita Rn
Year	First date	Last date
1917	1917-03-28	1917-11-19
1918	1918-04-08	1918-11-01
1919	1919-04-17	1919-09-22
1926	1926-05-14	1926-10-18
1928	1928-04-28	1928-10-09
1929	1929-05-07	1929-10-08
1930	1930-04-07	1930-10-20
1931	1931-05-23	1931-10-26
1932	1932-03-20	1932-09-27
1933	1933-05-20	1933-10-24
1934	1934-03-07	1934-10-31
1935	1935-04-14	1935-10-07
1936	1936-04-15	1936-10-12
1937	1937-04-15	1937-10-08
1938	1938-04-22	1938-10-01
1939	1939-04-21	1939-09-23
1940	1940-04-15	1940-10-08
1941	1941-05-07	1941-10-11
1942	1942-05-20	1942-09-30
1943	1943-04-24	1943-10-01
1944	1944-05-07	1944-10-12
1945	1945-04-30	1945-10-21
1946	1946-04-12	1946-09-26
1947	1947-05-02	1947-10-26
1948	1948-04-16	1948-10-03
1949	1949-04-24	1949-10-01

Every Fixed Threshold

Fixed thresholds at Helvetia Santa Rita Rn
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	26	136	1918	107
35 C (95 F): Days	26	58	1917	18
40 C (104 F): Days	5	4	1918	1
90 F (32.2 C): Days	26	111	1918	64
100 F (37.8 C): Days	19	19	1918	5
0 C (32 F): Ice days (max	2	2	1949	2
0 C (32 F): Frost days (min	27	55	1918	47
-10 C (14 F): Days with min	2	3	1949	3
20 C (68 F): Tropical nights (min	27	66	1933	59
25 C (77 F): Days with min	20	7	1940	2
10 mm (0.39 in): Days with 10 mm or more rain	29	28	1931	21
25 mm (0.98 in): Days with 25 mm or more rain	29	13	1931	3
50 mm (1.97 in): Days with 50 mm or more rain	12	2	1931	1
10 cm (3.9 in): Days with 10 cm or more snowfall	14	4	1949	4
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1947	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1917.

Download the Data

Data for Helvetia Santa Rita Rn 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).

Helvetia Santa Rita Rn Threshold Days by Year (USC00023981)

Key Facts for Helvetia Santa Rita Rn Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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