Copper Mine Trading Po Weather Records (USC00022099)

Record envelope, standing records and threshold days for Copper Mine Trading Po (USC00022099), Arizona, United States, with 38 years of record.

Key Facts for Copper Mine Trading Po

Copper Mine Trading Po (USC00022099) is a weather station in Arizona, United States at 36.63 latitude and -111.42 longitude, 1,946 m (6,385 ft) above sea level.
The station reports from 1939 to 1976, 38 years of record.
1,464 records set at Copper Mine Trading Po still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Copper Mine Trading Po set a daily record low minimum temperature of -15.6 C (3.9 F) on 30 November 1976.

About the Station

Location: Arizona, United States, 36.63 latitude, -111.42 longitude.
Elevation: 1,946 m (6,385 ft).
Period of record: 1939 to 1976, 38 years.
Eligible elements: tmax, tmin, prcp, snow.

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 Copper Mine Trading Po. 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 Copper Mine Trading Po, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	18.3 C (64.9 F)	-23.9 C (-11.0 F)	n/a	n/a
Feb	24.4 C (75.9 F)	-21.7 C (-7.1 F)	n/a	n/a
Mar	27.2 C (81.0 F)	-13.3 C (8.1 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-11.1 C (12.0 F)	n/a	n/a
May	36.7 C (98.1 F)	-3.9 C (25.0 F)	n/a	n/a
Jun	40.6 C (105.1 F)	-1.1 C (30.0 F)	n/a	n/a
Jul	41.1 C (106.0 F)	1.1 C (34.0 F)	n/a	n/a
Aug	39.4 C (102.9 F)	1.7 C (35.1 F)	n/a	n/a
Sep	38.3 C (100.9 F)	-3.9 C (25.0 F)	n/a	n/a
Oct	30.0 C (86.0 F)	-8.3 C (17.1 F)	n/a	n/a
Nov	25.6 C (78.1 F)	-16.1 C (3.0 F)	n/a	n/a
Dec	19.4 C (66.9 F)	-22.2 C (-8.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Copper Mine Trading Po still stand. 1956 holds the most, with 86.

Standing records at Copper Mine Trading Po by the year they were set
Year set	Standing records
1939	23
1940	15
1941	27
1942	31
1943	36
1944	17
1945	67
1946	82
1947	35
1948	32
1949	73
1950	50
1951	43
1952	45
1953	31
1954	35
1955	53
1956	86
1957	27
1958	48
1959	24
1960	54
1961	31
1962	40
1963	39
1964	12
1965	28
1966	33
1967	33
1968	35
1969	21
1970	33
1971	57
1972	38
1973	22
1974	32
1975	39
1976	37

Wettest Day of Each Month

Jul: 111.8 mm (4.4 in)

The wettest day on record for each calendar month at Copper Mine Trading Po. The most was 111.8 mm (4.4 in) on 10 July 1963.

Record daily precipitation for each month at Copper Mine Trading Po
Month	Record daily precipitation (mm)	Date
Jan	17.8 mm (0.7 in)	29 January 1957
Feb	25.4 mm (1.0 in)	6 February 1976
Mar	27.9 mm (1.1 in)	7 March 1958
Apr	41.9 mm (1.6 in)	7 April 1959
May	15.2 mm (0.6 in)	8 May 1976
Jun	27.9 mm (1.1 in)	13 June 1955
Jul	111.8 mm (4.4 in)	10 July 1963
Aug	45.7 mm (1.8 in)	29 August 1951
Sep	33.0 mm (1.3 in)	8 September 1961
Oct	33.5 mm (1.3 in)	20 October 1972
Nov	25.4 mm (1.0 in)	15 November 1955
Dec	15.2 mm (0.6 in)	9 December 1943

Period of Record Coverage

1939 to 1976

38 years of record at Copper Mine Trading Po, 1939 to 1976. 7 years have data for under 90 percent of days and are left out of rankings: 1939, 1950, 1957, 1964, 1965, 1972, 1973.

Days with data per year at Copper Mine Trading Po
Year	Days with data	Share of year	Complete
1939	291	80%	No
1940	364	99%	Yes
1941	362	99%	Yes
1942	364	100%	Yes
1943	361	99%	Yes
1944	366	100%	Yes
1945	362	99%	Yes
1946	364	100%	Yes
1947	356	98%	Yes
1948	362	99%	Yes
1949	365	100%	Yes
1950	302	83%	No
1951	364	100%	Yes
1952	366	100%	Yes
1953	361	99%	Yes
1954	361	99%	Yes
1955	362	99%	Yes
1956	366	100%	Yes
1957	325	89%	No
1958	334	92%	Yes
1959	353	97%	Yes
1960	362	99%	Yes
1961	363	99%	Yes
1962	365	100%	Yes
1963	334	92%	Yes
1964	90	25%	No
1965	245	67%	No
1966	335	92%	Yes
1967	335	92%	Yes
1968	336	92%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	303	83%	No
1973	301	82%	No
1974	364	100%	Yes
1975	364	100%	Yes
1976	344	94%	Yes

Latest Records

Latest records at Copper Mine Trading Po
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 November 1976	Copper Mine Trading Po, US	daily low min	-15.6 C (3.9 F)	5.6 C (10.1 F)	28 years	25 of 100 (Routine)
29 November 1976	Copper Mine Trading Po, US	monthly low min (Tie)	-16.1 C (3.0 F)	tie	0 years	3 of 100 (Routine)
28 November 1976	Copper Mine Trading Po, US	monthly low min	-16.1 C (3.0 F)	0.5 C (0.9 F)	20 years	20 of 100 (Routine)
28 November 1976	Copper Mine Trading Po, US	daily low max	-2.2 C (28.0 F)	3.9 C (7.0 F)	11 years	13 of 100 (Routine)
27 November 1976	Copper Mine Trading Po, US	daily low max (Tie)	-1.1 C (30.0 F)	tie	24 years	2 of 100 (Routine)
2 October 1976	Copper Mine Trading Po, US	daily rain	5.1 mm (0.20 in)	4.1 mm (0.16 in)	20 years	14 of 100 (Routine)
26 September 1976	Copper Mine Trading Po, US	daily rain	5.1 mm (0.20 in)	1.8 mm (0.07 in)	33 years	15 of 100 (Routine)
25 September 1976	Copper Mine Trading Po, US	daily rain	15.2 mm (0.6 in)	10.1 mm (0.4 in)	9 years	20 of 100 (Routine)
24 September 1976	Copper Mine Trading Po, US	daily low max (Tie)	17.8 C (64.0 F)	tie	18 years	2 of 100 (Routine)
10 September 1976	Copper Mine Trading Po, US	daily low max	20.0 C (68.0 F)	2.2 C (4.0 F)	27 years	16 of 100 (Routine)
9 September 1976	Copper Mine Trading Po, US	daily low max	21.1 C (70.0 F)	2.8 C (5.0 F)	15 years	13 of 100 (Routine)
27 July 1976	Copper Mine Trading Po, US	daily high max	38.3 C (100.9 F)	1.6 C (2.9 F)	33 years	17 of 100 (Routine)
26 July 1976	Copper Mine Trading Po, US	daily high max	37.8 C (100.0 F)	1.1 C (2.0 F)	5 years	8 of 100 (Routine)
25 July 1976	Copper Mine Trading Po, US	daily high max	38.3 C (100.9 F)	0.5 C (0.9 F)	33 years	13 of 100 (Routine)
20 July 1976	Copper Mine Trading Po, US	daily low max	25.6 C (78.1 F)	0.5 C (0.9 F)	33 years	13 of 100 (Routine)
17 July 1976	Copper Mine Trading Po, US	daily low min (Tie)	7.2 C (45.0 F)	tie	31 years	3 of 100 (Routine)
12 July 1976	Copper Mine Trading Po, US	daily high max	38.9 C (102.0 F)	0.6 C (1.1 F)	5 years	6 of 100 (Routine)
11 July 1976	Copper Mine Trading Po, US	daily high max	39.4 C (102.9 F)	1.1 C (2.0 F)	30 years	16 of 100 (Routine)
8 July 1976	Copper Mine Trading Po, US	daily high max (Tie)	38.9 C (102.0 F)	tie	25 years	2 of 100 (Routine)
6 July 1976	Copper Mine Trading Po, US	daily high max	40.0 C (104.0 F)	1.1 C (2.0 F)	23 years	13 of 100 (Routine)

Climate Trend

18 complete years, 1941 to 1975

One stripe for each of 18 complete years at Copper Mine Trading Po, 1941 to 1975. Blue stripes are years cooler than the station's own mean of 11.4 C (52.6 F); red stripes are warmer. The coolest year was 1941, at 9.9 C (49.9 F), and the warmest was 1946, at 13.2 C (55.8 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Copper Mine Trading Po as warming stripes, 1941 to 1975
Year	Annual mean temperature	Difference from the station mean
1941	9.9 C	-1.50 C
1942	11.5 C	+0.07 C
1943	12.5 C	+1.02 C
1944	11.0 C	-0.44 C
1946	13.2 C	+1.76 C
1948	11.2 C	-0.24 C
1953	11.6 C	+0.20 C
1954	12.1 C	+0.62 C
1956	10.6 C	-0.84 C
1959	11.8 C	+0.34 C
1960	11.1 C	-0.33 C
1961	10.8 C	-0.63 C
1962	12.0 C	+0.58 C
1969	11.5 C	+0.07 C
1970	11.5 C	+0.02 C
1971	11.1 C	-0.35 C
1974	12.0 C	+0.52 C
1975	10.5 C	-0.95 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

1939 to 1976

Yearly extremes at Copper Mine Trading Po: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.1 C (106.0 F)	1951	37.2 C (99.0 F)	38
Coldest night (TNn)	-23.9 C (-11.0 F)	1963	-16.1 C (3.0 F)	38
Wettest day (Rx1day)	111.8 mm (4.4 in)	1963	23.9 mm (0.9 in)	38
Wettest five days (Rx5day)	111.8 mm (4.4 in)	1963	31.7 mm (1.2 in)	38
Longest dry spell (CDD)	148 days	1967	62 days	38

Hottest day (TXx)

The hottest day of the year at Copper Mine Trading Po, 1939 to 1976. The record is 41.1 C (106.0 F) in 1951, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Copper Mine Trading Po by year
Year	Hottest day (TXx)
1939	36.7 C (98.1 F)
1940	36.7 C (98.1 F)
1941	33.9 C (93.0 F)
1942	37.8 C (100.0 F)
1943	37.8 C (100.0 F)
1944	37.2 C (99.0 F)
1945	37.2 C (99.0 F)
1946	39.4 C (102.9 F)
1947	38.3 C (100.9 F)
1948	38.9 C (102.0 F)
1949	38.9 C (102.0 F)
1950	38.3 C (100.9 F)
1951	41.1 C (106.0 F)
1952	37.2 C (99.0 F)
1953	38.9 C (102.0 F)
1954	40.6 C (105.1 F)
1955	38.3 C (100.9 F)
1956	38.9 C (102.0 F)
1957	37.2 C (99.0 F)
1958	37.8 C (100.0 F)
1959	37.8 C (100.0 F)
1960	35.6 C (96.1 F)
1961	37.2 C (99.0 F)
1962	36.7 C (98.1 F)
1963	36.7 C (98.1 F)
1964	31.1 C (88.0 F)
1965	35.0 C (95.0 F)
1966	36.7 C (98.1 F)
1967	37.2 C (99.0 F)
1968	36.1 C (97.0 F)
1969	37.2 C (99.0 F)
1970	40.6 C (105.1 F)
1971	38.3 C (100.9 F)
1972	36.7 C (98.1 F)
1973	37.2 C (99.0 F)
1974	37.8 C (100.0 F)
1975	36.7 C (98.1 F)
1976	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at Copper Mine Trading Po, 1939 to 1976. The record is -23.9 C (-11.0 F) in 1963, marked on the chart; the median year is -16.1 C (3.0 F).

Coldest night (TNn) at Copper Mine Trading Po by year
Year	Coldest night (TNn)
1939	-11.1 C (12.0 F)
1940	-13.3 C (8.1 F)
1941	-11.1 C (12.0 F)
1942	-18.3 C (-0.9 F)
1943	-15.6 C (3.9 F)
1944	-12.8 C (9.0 F)
1945	-16.1 C (3.0 F)
1946	-13.9 C (7.0 F)
1947	-17.8 C (0.0 F)
1948	-20.6 C (-5.1 F)
1949	-21.7 C (-7.1 F)
1950	-20.0 C (-4.0 F)
1951	-17.2 C (1.0 F)
1952	-15.0 C (5.0 F)
1953	-13.9 C (7.0 F)
1954	-18.3 C (-0.9 F)
1955	-20.0 C (-4.0 F)
1956	-16.7 C (1.9 F)
1957	-17.8 C (0.0 F)
1958	-12.8 C (9.0 F)
1959	-12.2 C (10.0 F)
1960	-22.2 C (-8.0 F)
1961	-18.3 C (-0.9 F)
1962	-15.0 C (5.0 F)
1963	-23.9 C (-11.0 F)
1964	-11.1 C (12.0 F)
1965	-11.1 C (12.0 F)
1966	-16.7 C (1.9 F)
1967	-18.3 C (-0.9 F)
1968	-20.0 C (-4.0 F)
1969	-11.7 C (10.9 F)
1970	-13.3 C (8.1 F)
1971	-20.0 C (-4.0 F)
1972	-15.0 C (5.0 F)
1973	-8.3 C (17.1 F)
1974	-16.1 C (3.0 F)
1975	-13.3 C (8.1 F)
1976	-20.6 C (-5.1 F)

Wettest day (Rx1day)

The wettest day of the year at Copper Mine Trading Po, 1939 to 1976. The record is 111.8 mm (4.4 in) in 1963, marked on the chart; the median year is 23.9 mm (0.9 in).

Wettest day (Rx1day) at Copper Mine Trading Po by year
Year	Wettest day (Rx1day)
1939	26.7 mm (1.1 in)
1940	27.9 mm (1.1 in)
1941	33.0 mm (1.3 in)
1942	13.7 mm (0.5 in)
1943	17.5 mm (0.7 in)
1944	25.4 mm (1.0 in)
1945	21.1 mm (0.8 in)
1946	24.9 mm (1.0 in)
1947	28.7 mm (1.1 in)
1948	21.8 mm (0.9 in)
1949	16.0 mm (0.6 in)
1950	14.7 mm (0.6 in)
1951	45.7 mm (1.8 in)
1952	29.5 mm (1.2 in)
1953	37.1 mm (1.5 in)
1954	15.5 mm (0.6 in)
1955	31.8 mm (1.3 in)
1956	25.4 mm (1.0 in)
1957	37.3 mm (1.5 in)
1958	30.5 mm (1.2 in)
1959	41.9 mm (1.6 in)
1960	17.8 mm (0.7 in)
1961	33.0 mm (1.3 in)
1962	22.9 mm (0.9 in)
1963	111.8 mm (4.4 in)
1964	14.5 mm (0.6 in)
1965	13.5 mm (0.5 in)
1966	18.0 mm (0.7 in)
1967	16.5 mm (0.6 in)
1968	26.7 mm (1.1 in)
1969	14.0 mm (0.6 in)
1970	10.2 mm (0.4 in)
1971	16.5 mm (0.6 in)
1972	33.5 mm (1.3 in)
1973	10.2 mm (0.4 in)
1974	16.5 mm (0.6 in)
1975	12.7 mm (0.5 in)
1976	25.4 mm (1.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Copper Mine Trading Po, 1939 to 1976. The record is 111.8 mm (4.4 in) in 1963, marked on the chart; the median year is 31.7 mm (1.2 in).

Wettest five days (Rx5day) at Copper Mine Trading Po by year
Year	Wettest five days (Rx5day)
1939	27.2 mm (1.1 in)
1940	42.2 mm (1.7 in)
1941	46.7 mm (1.8 in)
1942	16.3 mm (0.6 in)
1943	22.7 mm (0.9 in)
1944	27.9 mm (1.1 in)
1945	24.9 mm (1.0 in)
1946	30.8 mm (1.2 in)
1947	42.7 mm (1.7 in)
1948	30.5 mm (1.2 in)
1949	23.6 mm (0.9 in)
1950	19.8 mm (0.8 in)
1951	49.3 mm (1.9 in)
1952	48.1 mm (1.9 in)
1953	56.4 mm (2.2 in)
1954	21.6 mm (0.9 in)
1955	59.7 mm (2.4 in)
1956	36.5 mm (1.4 in)
1957	46.2 mm (1.8 in)
1958	44.5 mm (1.8 in)
1959	70.5 mm (2.8 in)
1960	32.5 mm (1.3 in)
1961	35.5 mm (1.4 in)
1962	38.6 mm (1.5 in)
1963	111.8 mm (4.4 in)
1964	14.5 mm (0.6 in)
1965	19.6 mm (0.8 in)
1966	27.7 mm (1.1 in)
1967	28.0 mm (1.1 in)
1968	33.5 mm (1.3 in)
1969	27.2 mm (1.1 in)
1970	24.2 mm (1.0 in)
1971	40.8 mm (1.6 in)
1972	76.5 mm (3.0 in)
1973	16.3 mm (0.6 in)
1974	28.7 mm (1.1 in)
1975	18.3 mm (0.7 in)
1976	49.5 mm (1.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Copper Mine Trading Po, 1939 to 1976. The record is 148 days in 1967, marked on the chart; the median year is 62 days.

Longest dry spell (CDD) at Copper Mine Trading Po by year
Year	Longest dry spell (CDD)
1939	110 days
1940	59 days
1941	25 days
1942	68 days
1943	36 days
1944	72 days
1945	60 days
1946	66 days
1947	55 days
1948	49 days
1949	66 days
1950	48 days
1951	57 days
1952	53 days
1953	41 days
1954	33 days
1955	65 days
1956	90 days
1957	44 days
1958	72 days
1959	56 days
1960	74 days
1961	59 days
1962	68 days
1963	128 days
1964	29 days
1965	34 days
1966	59 days
1967	148 days
1968	51 days
1969	56 days
1970	63 days
1971	76 days
1972	108 days
1973	72 days
1974	104 days
1975	79 days
1976	90 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.

Rainfall Return Levels

32 years, 1940 to 1976

A day with at least 21.6 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 94.5 mm (3.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Copper Mine Trading Po: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	21.6 mm (0.9 in)
5 years	33.0 mm (1.3 in)
10 years	43.0 mm (1.7 in)
25 years	59.5 mm (2.3 in)
50 years	75.2 mm (3.0 in)	Longer than the 32 years of record
100 years	94.5 mm (3.7 in)	Longer than the 32 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 32 years of values from 1940 to 1976.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 111.8 mm (4.4 in) in 1963; 45.7 mm (1.8 in) in 1951; 41.9 mm (1.6 in) in 1959.

Download the Data

Data for Copper Mine Trading Po standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Copper Mine Trading Po 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 2026-10-14 (14 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).