Portal Weather Records (USC00026706)

Record envelope, standing records and threshold days for Portal (USC00026706), Arizona, United States, with 42 years of record.

Key Facts for Portal

Portal (USC00026706) is a weather station in Arizona, United States at 31.90 latitude and -109.17 longitude, 1,525 m (5,003 ft) above sea level.
The station reports from 1914 to 1955, 42 years of record.
1,464 records set at Portal still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Portal set a daily record precipitation of 18.3 mm (0.7 in) on 12 September 1954.

About the Station

Location: Arizona, United States, 31.90 latitude, -109.17 longitude.
Elevation: 1,525 m (5,003 ft).
Period of record: 1914 to 1955, 42 years.
Eligible elements: 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 Portal. 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 Portal, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	25.0 C (77.0 F)	-20.0 C (-4.0 F)	n/a	n/a
Feb	24.4 C (75.9 F)	-18.3 C (-0.9 F)	n/a	n/a
Mar	29.4 C (84.9 F)	-11.1 C (12.0 F)	n/a	n/a
Apr	33.3 C (91.9 F)	-7.8 C (18.0 F)	n/a	n/a
May	37.2 C (99.0 F)	-3.3 C (26.1 F)	n/a	n/a
Jun	38.9 C (102.0 F)	0.6 C (33.1 F)	n/a	n/a
Jul	38.9 C (102.0 F)	4.4 C (39.9 F)	n/a	n/a
Aug	37.2 C (99.0 F)	5.6 C (42.1 F)	n/a	n/a
Sep	38.3 C (100.9 F)	-0.6 C (30.9 F)	n/a	n/a
Oct	32.8 C (91.0 F)	-5.0 C (23.0 F)	n/a	n/a
Nov	27.2 C (81.0 F)	-15.0 C (5.0 F)	n/a	n/a
Dec	23.3 C (73.9 F)	-13.3 C (8.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Portal still stand. 1939 holds the most, with 121.

Standing records at Portal by the year they were set
Year set	Standing records
1914	83
1937	17
1938	97
1939	121
1940	97
1941	97
1942	90
1944	38
1945	65
1946	101
1947	76
1948	97
1949	101
1950	101
1951	76
1952	70
1953	65
1954	60
1955	12

Wettest Day of Each Month

Nov: 73.9 mm (2.9 in)

The wettest day on record for each calendar month at Portal. The most was 73.9 mm (2.9 in) on 22 November 1919.

Record daily precipitation for each month at Portal
Month	Record daily precipitation (mm)	Date
Jan	58.4 mm (2.3 in)	19 January 1916
Feb	58.4 mm (2.3 in)	12 February 1931
Mar	33.0 mm (1.3 in)	16 March 1937
Apr	33.8 mm (1.3 in)	26 April 1919
May	21.6 mm (0.9 in)	19 May 1917
Jun	56.9 mm (2.2 in)	2 June 1952
Jul	52.1 mm (2.1 in)	11 July 1930
Aug	71.1 mm (2.8 in)	23 August 1942
Sep	63.2 mm (2.5 in)	19 September 1927
Oct	68.6 mm (2.7 in)	11 October 1928
Nov	73.9 mm (2.9 in)	22 November 1919
Dec	45.2 mm (1.8 in)	22 December 1914

Period of Record Coverage

1914 to 1955

19 years of record at Portal, 1914 to 1955. 6 years have data for under 90 percent of days and are left out of rankings: 1914, 1937, 1938, 1944, 1945, 1955.

Days with data per year at Portal
Year	Days with data	Share of year	Complete
1914	315	86%	No
1937	109	30%	No
1938	256	70%	No
1939	344	94%	Yes
1940	357	98%	Yes
1941	354	97%	Yes
1942	348	95%	Yes
1944	141	39%	No
1945	282	77%	No
1946	354	97%	Yes
1947	356	98%	Yes
1948	360	98%	Yes
1949	357	98%	Yes
1950	335	92%	Yes
1951	338	93%	Yes
1952	357	98%	Yes
1953	355	97%	Yes
1954	362	99%	Yes
1955	90	25%	No

Latest Records

Latest records at Portal
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 September 1954	Portal, US	daily rain	18.3 mm (0.7 in)	0.5 mm (0.02 in)	40 years	16 of 100 (Routine)
7 August 1954	Portal, US	daily rain	34.0 mm (1.3 in)	14.9 mm (0.6 in)	16 years	21 of 100 (Routine)
22 July 1954	Portal, US	daily rain	23.1 mm (0.9 in)	1.5 mm (0.06 in)	24 years	12 of 100 (Routine)
17 July 1954	Portal, US	daily rain	29.5 mm (1.2 in)	5.4 mm (0.21 in)	0 years	9 of 100 (Routine)
23 March 1954	Portal, US	daily rain	22.1 mm (0.9 in)	14.2 mm (0.6 in)	37 years	20 of 100 (Routine)
15 February 1954	Portal, US	daily rain	8.1 mm (0.32 in)	8.1 mm (0.32 in)	40 years	20 of 100 (Routine)
21 November 1953	Portal, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	38 years	25 of 100 (Routine)
19 August 1953	Portal, US	daily rain	12.7 mm (0.5 in)	1.5 mm (0.06 in)	7 years	7 of 100 (Routine)
17 July 1953	Portal, US	daily rain	24.1 mm (0.9 in)	5.6 mm (0.22 in)	20 years	16 of 100 (Routine)
13 July 1953	Portal, US	daily rain	14.0 mm (0.6 in)	3.8 mm (0.15 in)	4 years	9 of 100 (Routine)
14 June 1953	Portal, US	daily rain	1.8 mm (0.07 in)	1.8 mm (0.07 in)	39 years	17 of 100 (Routine)
12 June 1953	Portal, US	daily rain	14.0 mm (0.6 in)	10.7 mm (0.4 in)	32 years	20 of 100 (Routine)
24 February 1953	Portal, US	daily snowfall	6.4 cm (2.5 in)	6.4 cm (2.5 in)	39 years	27 of 100 (Routine)
10 February 1953	Portal, US	daily snowfall	7.6 cm (3.0 in)	7.6 cm (3.0 in)	39 years	30 of 100 (Routine)
10 February 1953	Portal, US	daily rain	20.8 mm (0.8 in)	4.3 mm (0.17 in)	21 years	14 of 100 (Routine)
18 December 1952	Portal, US	daily rain	8.9 mm (0.35 in)	6.9 mm (0.27 in)	38 years	20 of 100 (Routine)
17 December 1952	Portal, US	daily rain	9.4 mm (0.37 in)	0.5 mm (0.02 in)	12 years	6 of 100 (Routine)
30 November 1952	Portal, US	daily rain	11.4 mm (0.4 in)	1.2 mm (0.05 in)	19 years	8 of 100 (Routine)
9 November 1952	Portal, US	daily rain	5.1 mm (0.20 in)	3.3 mm (0.13 in)	6 years	6 of 100 (Routine)
24 September 1952	Portal, US	daily rain	13.0 mm (0.5 in)	11.0 mm (0.4 in)	23 years	18 of 100 (Routine)

Climate Trend

11 complete years, 1940 to 1954

One stripe for each of 11 complete years at Portal, 1940 to 1954. Blue stripes are years cooler than the station's own mean of 15.2 C (59.3 F); red stripes are warmer. The coolest year was 1941, at 12.0 C (53.7 F), and the warmest was 1950, at 16.8 C (62.2 F). The strongest colour marks a difference of 3.2 C (5.8 F).

Annual mean temperature at Portal as warming stripes, 1940 to 1954
Year	Annual mean temperature	Difference from the station mean
1940	12.3 C	-2.87 C
1941	12.0 C	-3.11 C
1946	15.6 C	+0.46 C
1947	15.7 C	+0.58 C
1948	15.9 C	+0.73 C
1949	15.1 C	-0.03 C
1950	16.8 C	+1.61 C
1951	15.6 C	+0.48 C
1952	15.5 C	+0.30 C
1953	15.8 C	+0.63 C
1954	16.4 C	+1.23 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

1914 to 1955

Yearly extremes at Portal: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.9 C (102.0 F)	1948	37.2 C (99.0 F)	19
Coldest night (TNn)	-20.0 C (-4.0 F)	1949	-12.2 C (10.0 F)	19
Wettest day (Rx1day)	73.9 mm (2.9 in)	1919	43.4 mm (1.7 in)	41
Wettest five days (Rx5day)	114.6 mm (4.5 in)	1919	58.4 mm (2.3 in)	41
Longest dry spell (CDD)	122 days	1932	52 days	41

Hottest day (TXx)

The hottest day of the year at Portal, 1914 to 1955. The record is 38.9 C (102.0 F) in 1948, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Portal by year
Year	Hottest day (TXx)
1914	37.8 C (100.0 F)
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	31.1 C (88.0 F)
1938	35.0 C (95.0 F)
1939	36.1 C (97.0 F)
1940	36.1 C (97.0 F)
1941	37.2 C (99.0 F)
1942	36.7 C (98.1 F)
1944	31.1 C (88.0 F)
1945	37.8 C (100.0 F)
1946	37.8 C (100.0 F)
1947	37.8 C (100.0 F)
1948	38.9 C (102.0 F)
1949	37.2 C (99.0 F)
1950	38.3 C (100.9 F)
1951	38.9 C (102.0 F)
1952	37.2 C (99.0 F)
1953	38.9 C (102.0 F)
1954	38.3 C (100.9 F)
1955	25.6 C (78.1 F)

Coldest night (TNn)

The coldest night of the year at Portal, 1914 to 1955. The record is -20.0 C (-4.0 F) in 1949, marked on the chart; the median year is -12.2 C (10.0 F).

Coldest night (TNn) at Portal by year
Year	Coldest night (TNn)
1914	-7.8 C (18.0 F)
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	-13.3 C (8.1 F)
1938	-15.0 C (5.0 F)
1939	-18.3 C (-0.9 F)
1940	-12.2 C (10.0 F)
1941	-12.8 C (9.0 F)
1942	-12.2 C (10.0 F)
1944	-17.8 C (0.0 F)
1945	-7.2 C (19.0 F)
1946	-10.6 C (12.9 F)
1947	-13.9 C (7.0 F)
1948	-15.6 C (3.9 F)
1949	-20.0 C (-4.0 F)
1950	-10.0 C (14.0 F)
1951	-8.3 C (17.1 F)
1952	-7.8 C (18.0 F)
1953	-13.3 C (8.1 F)
1954	-8.3 C (17.1 F)
1955	-10.0 C (14.0 F)

Wettest day (Rx1day)

The wettest day of the year at Portal, 1914 to 1955. The record is 73.9 mm (2.9 in) in 1919, marked on the chart; the median year is 43.4 mm (1.7 in).

Wettest day (Rx1day) at Portal by year
Year	Wettest day (Rx1day)
1914	46.5 mm (1.8 in)
1915	43.4 mm (1.7 in)
1916	58.4 mm (2.3 in)
1917	37.1 mm (1.5 in)
1918	30.5 mm (1.2 in)
1919	73.9 mm (2.9 in)
1920	32.5 mm (1.3 in)
1921	43.2 mm (1.7 in)
1922	53.1 mm (2.1 in)
1923	47.0 mm (1.9 in)
1924	20.3 mm (0.8 in)
1925	24.1 mm (0.9 in)
1926	53.3 mm (2.1 in)
1927	63.2 mm (2.5 in)
1928	68.6 mm (2.7 in)
1929	47.0 mm (1.9 in)
1930	52.1 mm (2.1 in)
1931	58.4 mm (2.3 in)
1932	45.7 mm (1.8 in)
1933	32.0 mm (1.3 in)
1934	33.0 mm (1.3 in)
1935	48.8 mm (1.9 in)
1936	52.8 mm (2.1 in)
1937	33.0 mm (1.3 in)
1938	27.4 mm (1.1 in)
1939	25.7 mm (1.0 in)
1940	30.2 mm (1.2 in)
1941	43.4 mm (1.7 in)
1942	71.1 mm (2.8 in)
1944	28.2 mm (1.1 in)
1945	63.8 mm (2.5 in)
1946	42.2 mm (1.7 in)
1947	54.1 mm (2.1 in)
1948	23.4 mm (0.9 in)
1949	35.8 mm (1.4 in)
1950	43.9 mm (1.7 in)
1951	20.8 mm (0.8 in)
1952	56.9 mm (2.2 in)
1953	24.1 mm (0.9 in)
1954	34.0 mm (1.3 in)
1955	15.2 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Portal, 1914 to 1955. The record is 114.6 mm (4.5 in) in 1919, marked on the chart; the median year is 58.4 mm (2.3 in).

Wettest five days (Rx5day) at Portal by year
Year	Wettest five days (Rx5day)
1914	101.3 mm (4.0 in)
1915	54.9 mm (2.2 in)
1916	107.3 mm (4.2 in)
1917	48.5 mm (1.9 in)
1918	47.9 mm (1.9 in)
1919	114.6 mm (4.5 in)
1920	58.4 mm (2.3 in)
1921	75.9 mm (3.0 in)
1922	80.2 mm (3.2 in)
1923	78.5 mm (3.1 in)
1924	26.1 mm (1.0 in)
1925	55.9 mm (2.2 in)
1926	76.2 mm (3.0 in)
1927	78.2 mm (3.1 in)
1928	82.1 mm (3.2 in)
1929	68.6 mm (2.7 in)
1930	70.1 mm (2.8 in)
1931	105.4 mm (4.1 in)
1932	57.9 mm (2.3 in)
1933	51.6 mm (2.0 in)
1934	56.6 mm (2.2 in)
1935	68.6 mm (2.7 in)
1936	56.6 mm (2.2 in)
1937	48.8 mm (1.9 in)
1938	58.4 mm (2.3 in)
1939	43.4 mm (1.7 in)
1940	52.0 mm (2.0 in)
1941	76.2 mm (3.0 in)
1942	92.2 mm (3.6 in)
1944	30.7 mm (1.2 in)
1945	86.5 mm (3.4 in)
1946	53.8 mm (2.1 in)
1947	61.0 mm (2.4 in)
1948	54.4 mm (2.1 in)
1949	52.3 mm (2.1 in)
1950	84.6 mm (3.3 in)
1951	24.1 mm (0.9 in)
1952	63.3 mm (2.5 in)
1953	38.5 mm (1.5 in)
1954	59.2 mm (2.3 in)
1955	26.1 mm (1.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Portal, 1914 to 1955. The record is 122 days in 1932, marked on the chart; the median year is 52 days.

Longest dry spell (CDD) at Portal by year
Year	Longest dry spell (CDD)
1914	61 days
1915	74 days
1916	66 days
1917	90 days
1918	47 days
1919	32 days
1920	44 days
1921	37 days
1922	71 days
1923	40 days
1924	55 days
1925	53 days
1926	40 days
1927	43 days
1928	55 days
1929	61 days
1930	57 days
1931	48 days
1932	122 days
1933	52 days
1934	64 days
1935	44 days
1936	66 days
1937	71 days
1938	59 days
1939	37 days
1940	28 days
1941	23 days
1942	67 days
1944	45 days
1945	40 days
1946	51 days
1947	40 days
1948	31 days
1949	55 days
1950	87 days
1951	61 days
1952	41 days
1953	45 days
1954	64 days
1955	31 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

36 years, 1914 to 1954

A day with at least 42.0 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 82.1 mm (3.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Portal: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	42.0 mm (1.7 in)
5 years	55.1 mm (2.2 in)
10 years	62.8 mm (2.5 in)
25 years	71.3 mm (2.8 in)
50 years	77.0 mm (3.0 in)	Longer than the 36 years of record
100 years	82.1 mm (3.2 in)	Longer than the 36 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, 36 years of values from 1914 to 1954.

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: 73.9 mm (2.9 in) in 1919; 71.1 mm (2.8 in) in 1942; 68.6 mm (2.7 in) in 1928.

Download the Data

Data for Portal standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Portal 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).