Helvetia Santa Rita Rn Weather Records (USC00023981)

Record envelope, standing records and threshold days for Helvetia Santa Rita Rn (USC00023981), Arizona, United States, with 35 years of record.

Key Facts for Helvetia Santa Rita Rn

Helvetia Santa Rita Rn (USC00023981) is a weather station in Arizona, United States at 31.87 latitude and -110.78 longitude, 1,312 m (4,304 ft) above sea level.
The station reports from 1916 to 1950, 35 years of record.
1,464 records set at Helvetia Santa Rita Rn still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Helvetia Santa Rita Rn tied a daily record high maximum temperature of 31.1 C (88.0 F) on 23 April 1950.

About the Station

Location: Arizona, United States, 31.87 latitude, -110.78 longitude.
Elevation: 1,312 m (4,304 ft).
Period of record: 1916 to 1950, 35 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Helvetia Santa Rita Rn. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Helvetia Santa Rita Rn, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	27.2 C (81.0 F)	-12.2 C (10.0 F)	n/a	n/a
Feb	27.2 C (81.0 F)	-8.3 C (17.1 F)	n/a	n/a
Mar	30.6 C (87.1 F)	-6.7 C (19.9 F)	n/a	n/a
Apr	34.4 C (93.9 F)	-3.3 C (26.1 F)	n/a	n/a
May	37.2 C (99.0 F)	0.0 C (32.0 F)	n/a	n/a
Jun	41.7 C (107.1 F)	5.6 C (42.1 F)	n/a	n/a
Jul	42.2 C (108.0 F)	11.7 C (53.1 F)	n/a	n/a
Aug	41.1 C (106.0 F)	11.1 C (52.0 F)	n/a	n/a
Sep	38.3 C (100.9 F)	7.8 C (46.0 F)	n/a	n/a
Oct	36.7 C (98.1 F)	-1.1 C (30.0 F)	n/a	n/a
Nov	33.3 C (91.9 F)	-6.7 C (19.9 F)	n/a	n/a
Dec	26.1 C (79.0 F)	-8.9 C (16.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Helvetia Santa Rita Rn still stand. 1917 holds the most, with 95.

Standing records at Helvetia Santa Rita Rn by the year they were set
Year set	Standing records
1916	31
1917	95
1918	88
1919	49
1920	42
1921	33
1922	62
1923	29
1924	38
1925	44
1926	29
1927	61
1928	42
1929	33
1930	49
1931	41
1932	45
1933	47
1934	45
1935	36
1936	38
1937	30
1938	36
1939	46
1940	31
1941	32
1942	28
1943	29
1944	36
1945	31
1946	32
1947	37
1948	30
1949	71
1950	18

Wettest Day of Each Month

Aug: 73.4 mm (2.9 in)

The wettest day on record for each calendar month at Helvetia Santa Rita Rn. The most was 73.4 mm (2.9 in) on 31 August 1935.

Record daily precipitation for each month at Helvetia Santa Rita Rn
Month	Record daily precipitation (mm)	Date
Jan	52.6 mm (2.1 in)	6 January 1946
Feb	53.8 mm (2.1 in)	7 February 1937
Mar	50.8 mm (2.0 in)	17 March 1930
Apr	29.0 mm (1.1 in)	12 April 1941
May	27.7 mm (1.1 in)	6 May 1930
Jun	46.2 mm (1.8 in)	28 June 1938
Jul	61.2 mm (2.4 in)	17 July 1929
Aug	73.4 mm (2.9 in)	31 August 1935
Sep	72.6 mm (2.9 in)	18 September 1931
Oct	27.9 mm (1.1 in)	31 October 1948
Nov	44.5 mm (1.8 in)	27 November 1919
Dec	52.6 mm (2.1 in)	29 December 1934

Period of Record Coverage

1916 to 1950

35 years of record at Helvetia Santa Rita Rn, 1916 to 1950. 9 years have data for under 90 percent of days and are left out of rankings: 1916, 1920, 1921, 1922, 1923, 1924, 1925, 1927 and others.

Days with data per year at Helvetia Santa Rita Rn
Year	Days with data	Share of year	Complete
1916	148	40%	No
1917	362	99%	Yes
1918	364	100%	Yes
1919	333	91%	Yes
1920	119	33%	No
1921	144	39%	No
1922	227	62%	No
1923	110	30%	No
1924	196	54%	No
1925	309	85%	No
1926	345	95%	Yes
1927	320	88%	No
1928	360	98%	Yes
1929	339	93%	Yes
1930	364	100%	Yes
1931	353	97%	Yes
1932	364	99%	Yes
1933	354	97%	Yes
1934	362	99%	Yes
1935	363	99%	Yes
1936	366	100%	Yes
1937	363	99%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	362	99%	Yes
1945	364	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	365	100%	Yes
1949	365	100%	Yes
1950	120	33%	No

Latest Records

Latest records at Helvetia Santa Rita Rn
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
23 April 1950	Helvetia Santa Rita Rn, US	daily high max (Tie)	31.1 C (88.0 F)	tie	31 years	3 of 100 (Routine)
21 April 1950	Helvetia Santa Rita Rn, US	monthly high max (Tie)	34.4 C (93.9 F)	tie	0 years	3 of 100 (Routine)
20 April 1950	Helvetia Santa Rita Rn, US	daily high max	33.3 C (91.9 F)	2.2 C (4.0 F)	28 years	15 of 100 (Routine)
19 April 1950	Helvetia Santa Rita Rn, US	daily high max	33.9 C (93.0 F)	2.8 C (5.0 F)	17 years	14 of 100 (Routine)
18 April 1950	Helvetia Santa Rita Rn, US	monthly high max	34.4 C (93.9 F)	1.6 C (2.9 F)	32 years	25 of 100 (Routine)
3 April 1950	Helvetia Santa Rita Rn, US	daily high min (Tie)	15.0 C (59.0 F)	tie	7 years	1 of 100 (Routine)
1 April 1950	Helvetia Santa Rita Rn, US	daily high min (Tie)	14.4 C (57.9 F)	tie	19 years	2 of 100 (Routine)
23 March 1950	Helvetia Santa Rita Rn, US	daily high min	13.3 C (55.9 F)	0.5 C (0.9 F)	28 years	12 of 100 (Routine)
27 February 1950	Helvetia Santa Rita Rn, US	daily rain	20.1 mm (0.8 in)	13.7 mm (0.5 in)	3 years	16 of 100 (Routine)
19 February 1950	Helvetia Santa Rita Rn, US	daily high min	13.9 C (57.0 F)	2.2 C (4.0 F)	20 years	14 of 100 (Routine)
18 February 1950	Helvetia Santa Rita Rn, US	daily high min	11.1 C (52.0 F)	0.5 C (0.9 F)	20 years	10 of 100 (Routine)
17 February 1950	Helvetia Santa Rita Rn, US	daily high min (Tie)	10.0 C (50.0 F)	tie	23 years	2 of 100 (Routine)
12 February 1950	Helvetia Santa Rita Rn, US	daily rain	38.1 mm (1.5 in)	6.3 mm (0.25 in)	19 years	14 of 100 (Routine)
24 January 1950	Helvetia Santa Rita Rn, US	daily high min (Tie)	7.8 C (46.0 F)	tie	24 years	2 of 100 (Routine)
23 January 1950	Helvetia Santa Rita Rn, US	daily high max	25.6 C (78.1 F)	3.4 C (6.1 F)	7 years	11 of 100 (Routine)
22 January 1950	Helvetia Santa Rita Rn, US	daily high max	25.6 C (78.1 F)	3.4 C (6.1 F)	6 years	10 of 100 (Routine)
22 January 1950	Helvetia Santa Rita Rn, US	daily high min	11.1 C (52.0 F)	2.8 C (5.0 F)	6 years	10 of 100 (Routine)
21 January 1950	Helvetia Santa Rita Rn, US	daily high min	12.8 C (55.0 F)	3.4 C (6.1 F)	11 years	14 of 100 (Routine)
21 January 1950	Helvetia Santa Rita Rn, US	daily high max	25.6 C (78.1 F)	2.3 C (4.1 F)	11 years	10 of 100 (Routine)
20 January 1950	Helvetia Santa Rita Rn, US	daily high min	9.4 C (48.9 F)	1.6 C (2.9 F)	8 years	8 of 100 (Routine)

Climate Trend

25 complete years, 1917 to 1949

One stripe for each of 25 complete years at Helvetia Santa Rita Rn, 1917 to 1949. Blue stripes are years cooler than the station's own mean of 17.7 C (63.8 F); red stripes are warmer. The coolest year was 1931, at 16.6 C (61.9 F), and the warmest was 1934, at 18.9 C (66.0 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Helvetia Santa Rita Rn as warming stripes, 1917 to 1949
Year	Annual mean temperature	Difference from the station mean
1917	17.7 C	+0.04 C
1918	17.7 C	+0.00 C
1926	17.5 C	-0.13 C
1928	18.3 C	+0.67 C
1929	17.4 C	-0.26 C
1930	17.6 C	-0.04 C
1931	16.6 C	-1.04 C
1932	17.8 C	+0.16 C
1933	17.8 C	+0.15 C
1934	18.9 C	+1.23 C
1935	17.4 C	-0.26 C
1936	18.1 C	+0.47 C
1937	17.7 C	+0.01 C
1938	17.7 C	+0.02 C
1939	17.6 C	-0.06 C
1940	18.2 C	+0.51 C
1941	16.9 C	-0.78 C
1942	17.8 C	+0.14 C
1943	18.3 C	+0.63 C
1944	16.9 C	-0.72 C
1945	17.2 C	-0.47 C
1946	17.7 C	+0.01 C
1947	17.7 C	+0.00 C
1948	17.6 C	-0.03 C
1949	17.3 C	-0.37 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1916 to 1950

Yearly extremes at Helvetia Santa Rita Rn: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.2 C (108.0 F)	1920	38.3 C (100.9 F)	35
Coldest night (TNn)	-12.2 C (10.0 F)	1937	-6.1 C (21.0 F)	35
Wettest day (Rx1day)	73.4 mm (2.9 in)	1935	42.2 mm (1.7 in)	35
Wettest five days (Rx5day)	154.5 mm (6.1 in)	1931	67.6 mm (2.7 in)	35
Longest dry spell (CDD)	92 days	1936	54 days	35

Hottest day (TXx)

The hottest day of the year at Helvetia Santa Rita Rn, 1916 to 1950. The record is 42.2 C (108.0 F) in 1920, marked on the chart; the median year is 38.3 C (100.9 F).

Hottest day (TXx) at Helvetia Santa Rita Rn by year
Year	Hottest day (TXx)
1916	39.4 C (102.9 F)
1917	40.6 C (105.1 F)
1918	41.1 C (106.0 F)
1919	40.0 C (104.0 F)
1920	42.2 C (108.0 F)
1921	38.3 C (100.9 F)
1922	40.0 C (104.0 F)
1923	41.7 C (107.1 F)
1924	36.7 C (98.1 F)
1925	39.4 C (102.9 F)
1926	39.4 C (102.9 F)
1927	39.4 C (102.9 F)
1928	38.3 C (100.9 F)
1929	40.6 C (105.1 F)
1930	37.8 C (100.0 F)
1931	37.2 C (99.0 F)
1932	37.8 C (100.0 F)
1933	40.0 C (104.0 F)
1934	38.9 C (102.0 F)
1935	37.2 C (99.0 F)
1936	38.3 C (100.9 F)
1937	37.8 C (100.0 F)
1938	37.2 C (99.0 F)
1939	37.2 C (99.0 F)
1940	38.9 C (102.0 F)
1941	37.2 C (99.0 F)
1942	38.3 C (100.9 F)
1943	37.8 C (100.0 F)
1944	38.9 C (102.0 F)
1945	37.2 C (99.0 F)
1946	38.3 C (100.9 F)
1947	38.3 C (100.9 F)
1948	38.9 C (102.0 F)
1949	37.2 C (99.0 F)
1950	34.4 C (93.9 F)

Coldest night (TNn)

The coldest night of the year at Helvetia Santa Rita Rn, 1916 to 1950. The record is -12.2 C (10.0 F) in 1937, marked on the chart; the median year is -6.1 C (21.0 F).

Coldest night (TNn) at Helvetia Santa Rita Rn by year
Year	Coldest night (TNn)
1916	-8.3 C (17.1 F)
1917	-6.7 C (19.9 F)
1918	-7.2 C (19.0 F)
1919	-8.9 C (16.0 F)
1920	2.2 C (36.0 F)
1921	-6.7 C (19.9 F)
1922	-6.7 C (19.9 F)
1923	0.0 C (32.0 F)
1924	-5.6 C (21.9 F)
1925	-6.1 C (21.0 F)
1926	-8.9 C (16.0 F)
1927	-3.3 C (26.1 F)
1928	-5.0 C (23.0 F)
1929	-5.6 C (21.9 F)
1930	-6.1 C (21.0 F)
1931	-5.0 C (23.0 F)
1932	-7.8 C (18.0 F)
1933	-8.3 C (17.1 F)
1934	-5.0 C (23.0 F)
1935	-7.2 C (19.0 F)
1936	-3.3 C (26.1 F)
1937	-12.2 C (10.0 F)
1938	-1.7 C (28.9 F)
1939	-7.8 C (18.0 F)
1940	-2.2 C (28.0 F)
1941	-2.2 C (28.0 F)
1942	-6.1 C (21.0 F)
1943	-2.8 C (27.0 F)
1944	-2.8 C (27.0 F)
1945	-3.9 C (25.0 F)
1946	-4.4 C (24.1 F)
1947	-5.6 C (21.9 F)
1948	-8.3 C (17.1 F)
1949	-11.7 C (10.9 F)
1950	-6.7 C (19.9 F)

Wettest day (Rx1day)

The wettest day of the year at Helvetia Santa Rita Rn, 1916 to 1950. The record is 73.4 mm (2.9 in) in 1935, marked on the chart; the median year is 42.2 mm (1.7 in).

Wettest day (Rx1day) at Helvetia Santa Rita Rn by year
Year	Wettest day (Rx1day)
1916	27.9 mm (1.1 in)
1917	51.1 mm (2.0 in)
1918	42.2 mm (1.7 in)
1919	44.5 mm (1.8 in)
1920	30.5 mm (1.2 in)
1921	55.9 mm (2.2 in)
1922	26.9 mm (1.1 in)
1923	56.9 mm (2.2 in)
1924	35.1 mm (1.4 in)
1925	40.6 mm (1.6 in)
1926	34.3 mm (1.4 in)
1927	30.5 mm (1.2 in)
1928	32.0 mm (1.3 in)
1929	61.2 mm (2.4 in)
1930	50.8 mm (2.0 in)
1931	72.6 mm (2.9 in)
1932	38.1 mm (1.5 in)
1933	55.9 mm (2.2 in)
1934	52.6 mm (2.1 in)
1935	73.4 mm (2.9 in)
1936	32.3 mm (1.3 in)
1937	53.8 mm (2.1 in)
1938	51.8 mm (2.0 in)
1939	32.0 mm (1.3 in)
1940	52.8 mm (2.1 in)
1941	48.8 mm (1.9 in)
1942	49.0 mm (1.9 in)
1943	50.8 mm (2.0 in)
1944	41.9 mm (1.6 in)
1945	39.1 mm (1.5 in)
1946	52.6 mm (2.1 in)
1947	31.2 mm (1.2 in)
1948	31.5 mm (1.2 in)
1949	30.7 mm (1.2 in)
1950	38.1 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Helvetia Santa Rita Rn, 1916 to 1950. The record is 154.5 mm (6.1 in) in 1931, marked on the chart; the median year is 67.6 mm (2.7 in).

Wettest five days (Rx5day) at Helvetia Santa Rita Rn by year
Year	Wettest five days (Rx5day)
1916	53.3 mm (2.1 in)
1917	58.7 mm (2.3 in)
1918	64.8 mm (2.6 in)
1919	76.2 mm (3.0 in)
1920	49.3 mm (1.9 in)
1921	86.3 mm (3.4 in)
1922	47.2 mm (1.9 in)
1923	102.6 mm (4.0 in)
1924	44.3 mm (1.7 in)
1925	71.2 mm (2.8 in)
1926	75.5 mm (3.0 in)
1927	48.0 mm (1.9 in)
1928	66.8 mm (2.6 in)
1929	117.8 mm (4.6 in)
1930	93.2 mm (3.7 in)
1931	154.5 mm (6.1 in)
1932	69.9 mm (2.8 in)
1933	58.2 mm (2.3 in)
1934	66.4 mm (2.6 in)
1935	86.1 mm (3.4 in)
1936	55.3 mm (2.2 in)
1937	58.5 mm (2.3 in)
1938	77.4 mm (3.0 in)
1939	58.9 mm (2.3 in)
1940	67.6 mm (2.7 in)
1941	87.4 mm (3.4 in)
1942	68.0 mm (2.7 in)
1943	112.3 mm (4.4 in)
1944	63.8 mm (2.5 in)
1945	75.5 mm (3.0 in)
1946	85.1 mm (3.4 in)
1947	51.8 mm (2.0 in)
1948	79.7 mm (3.1 in)
1949	51.1 mm (2.0 in)
1950	38.1 mm (1.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Helvetia Santa Rita Rn, 1916 to 1950. The record is 92 days in 1936, marked on the chart; the median year is 54 days.

Longest dry spell (CDD) at Helvetia Santa Rita Rn by year
Year	Longest dry spell (CDD)
1916	54 days
1917	76 days
1918	43 days
1919	42 days
1920	20 days
1921	28 days
1922	51 days
1923	76 days
1924	70 days
1925	52 days
1926	33 days
1927	36 days
1928	62 days
1929	55 days
1930	39 days
1931	48 days
1932	63 days
1933	51 days
1934	54 days
1935	66 days
1936	92 days
1937	54 days
1938	54 days
1939	57 days
1940	28 days
1941	52 days
1942	67 days
1943	87 days
1944	49 days
1945	74 days
1946	68 days
1947	47 days
1948	79 days
1949	77 days
1950	36 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

24 years with a frost

Across 24 years with a frost, the median last spring frost at Helvetia Santa Rita Rn falls on 23 March and the median first autumn frost on 23 November, which leaves a median of 247 days between them.

Frost dates and growing season at Helvetia Santa Rita Rn
Measure	Median, all years	Earliest period	Recent period (1917 to 1949)	Recent against earliest	Fitted trend
Last spring frost	23 March	n/a	23 March	n/a	n/a
First autumn frost	23 November	n/a	23 November	n/a	n/a
Growing days	247 days	n/a	247 days	n/a	n/a

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Download the Data

Data for Helvetia Santa Rita Rn standing records by year: CSV or JSON. Field meanings are on the data page.
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).