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San Pedro Weather Records (USC00047876)

Record envelope, standing records and threshold days for San Pedro (USC00047876), California, United States, with 59 years of record.

Key Facts for San Pedro

  • San Pedro (USC00047876) is a weather station in California, United States at 33.72 latitude and -118.27 longitude, 3 m (10 ft) above sea level.
  • The station reports from 1906 to 1964, 59 years of record.
  • 1,464 records set at San Pedro still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • San Pedro tied a daily record low maximum temperature of 20.6 C (69.1 F) on 28 August 1964.

About the Station

  • Location: California, United States, 33.72 latitude, -118.27 longitude.
  • Elevation: 3 m (10 ft).
  • Period of record: 1906 to 1964, 59 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at San Pedro, with 2026 drawn through them The band shows the record high and record low for each calendar day at San Pedro. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -10010203040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at San Pedro. 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 San Pedro, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan31.7 C (89.1 F)-2.2 C (28.0 F)n/an/a
Feb32.2 C (90.0 F)-1.1 C (30.0 F)n/an/a
Mar31.1 C (88.0 F)3.3 C (37.9 F)n/an/a
Apr32.8 C (91.0 F)3.9 C (39.0 F)n/an/a
May33.9 C (93.0 F)3.3 C (37.9 F)n/an/a
Jun31.1 C (88.0 F)7.8 C (46.0 F)n/an/a
Jul33.9 C (93.0 F)8.9 C (48.0 F)n/an/a
Aug32.8 C (91.0 F)10.6 C (51.1 F)n/an/a
Sep38.3 C (100.9 F)9.4 C (48.9 F)n/an/a
Oct36.1 C (97.0 F)6.7 C (44.1 F)n/an/a
Nov33.3 C (91.9 F)1.7 C (35.1 F)n/an/a
Dec30.6 C (87.1 F)2.2 C (36.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at San Pedro by the year they were set 1,464 records at San Pedro still stand. 1931 holds the most, with 97. 02550751001918: 91919: 771920: 251921: 711922: 261923: 341924: 511925: 251926: 201927: 151928: 191929: 271930: 251931: 971932: 231933: 601934: 161935: 351936: 241937: 261938: 211939: 341940: 271941: 171942: 381943: 481944: 331945: 111946: 191947: 191948: 211949: 441950: 281951: 371952: 481953: 431954: 211955: 151956: 221957: 271958: 411959: 351960: 221961: 331962: 271963: 181964: 101918192319281933193819431948195319581963
1,464 records at San Pedro still stand. 1931 holds the most, with 97.
Standing records at San Pedro by the year they were set
Year setStanding records
19189
191977
192025
192171
192226
192334
192451
192525
192620
192715
192819
192927
193025
193197
193223
193360
193416
193535
193624
193726
193821
193934
194027
194117
194238
194348
194433
194511
194619
194719
194821
194944
195028
195137
195248
195343
195421
195515
195622
195727
195841
195935
196022
196133
196227
196318
196410

All-Time Record Progression

2 new records
When San Pedro set new all-time records 2 all-time records were set at San Pedro between 26 January 1956 and 27 September 1963. Each dot is a new record. Record daily precipitationRecord high minimum temperature26 January 1956: Record daily precipitation 130.8 mm (5.1 in)27 September 1963: Record high minimum temperature 26.7 C (80.1 F)1960
2 all-time records were set at San Pedro between 26 January 1956 and 27 September 1963. Each dot is a new record.
When San Pedro set new all-time records
DateKindDetail
1956-01-26Record daily precipitationRecord daily precipitation 130.8 mm (5.1 in)
1963-09-27Record high minimum temperatureRecord high minimum temperature 26.7 C (80.1 F)

Wettest Day of Each Month

Jan: 130.8 mm (5.1 in)
Record daily precipitation for each month at San Pedro The wettest day on record for each calendar month at San Pedro. The most was 130.8 mm (5.1 in) on 26 January 1956. 050100150 Jan: 130.8 mm (5.1 in), 26 January 1956 Jan Feb: 90.4 mm (3.6 in), 19 February 1958 Feb Mar: 69.1 mm (2.7 in), 14 March 1921 Mar Apr: 44.5 mm (1.8 in), 6 April 1926 Apr May: 26.4 mm (1.0 in), 26 May 1906 May Jun: 14.5 mm (0.6 in), 4 June 1933 Jun Jul: 8.6 mm (0.34 in), 18 July 1910 Jul Aug: 7.6 mm (0.30 in), 14 August 1933 Aug Sep: 43.2 mm (1.7 in), 29 September 1911 Sep Oct: 66.0 mm (2.6 in), 31 October 1927 Oct Nov: 56.9 mm (2.2 in), 13 November 1946 Nov Dec: 85.1 mm (3.4 in), 16 December 1914 Dec
The wettest day on record for each calendar month at San Pedro. The most was 130.8 mm (5.1 in) on 26 January 1956.
Record daily precipitation for each month at San Pedro
MonthRecord daily precipitation (mm)Date
Jan130.8 mm (5.1 in)26 January 1956
Feb90.4 mm (3.6 in)19 February 1958
Mar69.1 mm (2.7 in)14 March 1921
Apr44.5 mm (1.8 in)6 April 1926
May26.4 mm (1.0 in)26 May 1906
Jun14.5 mm (0.6 in)4 June 1933
Jul8.6 mm (0.34 in)18 July 1910
Aug7.6 mm (0.30 in)14 August 1933
Sep43.2 mm (1.7 in)29 September 1911
Oct66.0 mm (2.6 in)31 October 1927
Nov56.9 mm (2.2 in)13 November 1946
Dec85.1 mm (3.4 in)16 December 1914

Period of Record Coverage

1918 to 1964
Days with data per year at San Pedro 47 years of record at San Pedro, 1918 to 1964. 4 years have data for under 90 percent of days and are left out of rankings: 1918, 1922, 1945, 1964. 1918: 118 of 365 days1919: 361 of 365 days1920: 366 of 366 days1921: 365 of 365 days1922: 275 of 365 days1923: 365 of 365 days1924: 366 of 366 days1925: 365 of 365 days1926: 365 of 365 days1927: 365 of 365 days1928: 366 of 366 days1929: 364 of 365 days1930: 346 of 365 days1931: 363 of 365 days1932: 365 of 366 days1933: 365 of 365 days1934: 365 of 365 days1935: 365 of 365 days1936: 365 of 366 days1937: 364 of 365 days1938: 365 of 365 days1939: 363 of 365 days1940: 360 of 366 days1941: 364 of 365 days1942: 361 of 365 days1943: 348 of 365 days1944: 334 of 366 days1945: 177 of 365 days1946: 359 of 365 days1947: 363 of 365 days1948: 365 of 366 days1949: 365 of 365 days1950: 363 of 365 days1951: 365 of 365 days1952: 351 of 366 days1953: 365 of 365 days1954: 365 of 365 days1955: 363 of 365 days1956: 362 of 366 days1957: 360 of 365 days1958: 363 of 365 days1959: 350 of 365 days1960: 355 of 366 days1961: 361 of 365 days1962: 365 of 365 days1963: 363 of 365 days1964: 244 of 366 days19201930194019501960
47 years of record at San Pedro, 1918 to 1964. 4 years have data for under 90 percent of days and are left out of rankings: 1918, 1922, 1945, 1964.
Days with data per year at San Pedro
YearDays with dataShare of yearComplete
191811832%No
191936199%Yes
1920366100%Yes
1921365100%Yes
192227575%No
1923365100%Yes
1924366100%Yes
1925365100%Yes
1926365100%Yes
1927365100%Yes
1928366100%Yes
1929364100%Yes
193034695%Yes
193136399%Yes
1932365100%Yes
1933365100%Yes
1934365100%Yes
1935365100%Yes
1936365100%Yes
1937364100%Yes
1938365100%Yes
193936399%Yes
194036098%Yes
1941364100%Yes
194236199%Yes
194334895%Yes
194433491%Yes
194517748%No
194635998%Yes
194736399%Yes
1948365100%Yes
1949365100%Yes
195036399%Yes
1951365100%Yes
195235196%Yes
1953365100%Yes
1954365100%Yes
195536399%Yes
195636299%Yes
195736099%Yes
195836399%Yes
195935096%Yes
196035597%Yes
196136199%Yes
1962365100%Yes
196336399%Yes
196424467%No

Latest Records

20
Latest records at San Pedro
DateStationRecordValueBeat old record byOld record stoodSignificance
28 August 1964San Pedro, USdaily low max (Tie)20.6 C (69.1 F)tie24 years2 of 100 (Routine)
6 August 1964San Pedro, USdaily high min (Tie)18.9 C (66.0 F)tie26 years2 of 100 (Routine)
10 July 1964San Pedro, USdaily low min11.7 C (53.1 F)1.1 C (2.0 F)29 years18 of 100 (Routine)
24 June 1964San Pedro, USdaily low max (Tie)18.9 C (66.0 F)tie43 years4 of 100 (Routine)
23 June 1964San Pedro, USdaily low max (Tie)18.9 C (66.0 F)tie2 years1 of 100 (Routine)
22 June 1964San Pedro, USdaily low max (Tie)19.4 C (66.9 F)tie43 years4 of 100 (Routine)
9 June 1964San Pedro, USdaily rain7.1 mm (0.28 in)7.1 mm (0.28 in)46 years20 of 100 (Routine)
9 June 1964San Pedro, USdaily low min (Tie)11.7 C (53.1 F)tie12 years1 of 100 (Routine)
25 May 1964San Pedro, USdaily high min (Tie)15.6 C (60.1 F)tie32 years3 of 100 (Routine)
15 May 1964San Pedro, USdaily low max16.1 C (61.0 F)0.6 C (1.1 F)11 years9 of 100 (Routine)
7 May 1964San Pedro, USdaily low max (Tie)14.4 C (57.9 F)tie43 years4 of 100 (Routine)
6 May 1964San Pedro, USmonthly low max (Tie)13.9 C (57.0 F)tie30 years5 of 100 (Routine)
5 May 1964San Pedro, USdaily low max14.4 C (57.9 F)1.2 C (2.2 F)43 years20 of 100 (Routine)
4 May 1964San Pedro, USdaily low max15.0 C (59.0 F)0.6 C (1.1 F)14 years10 of 100 (Routine)
24 April 1964San Pedro, USdaily low max (Tie)14.4 C (57.9 F)tie4 years1 of 100 (Routine)
23 April 1964San Pedro, USdaily low max (Tie)15.0 C (59.0 F)tie4 years1 of 100 (Routine)
15 April 1964San Pedro, USdaily high min17.8 C (64.0 F)1.1 C (2.0 F)16 years13 of 100 (Routine)
3 April 1964San Pedro, USdaily low max (Tie)15.0 C (59.0 F)tie43 years4 of 100 (Routine)
24 March 1964San Pedro, USdaily low max (Tie)12.8 C (55.0 F)tie16 years2 of 100 (Routine)
23 March 1964San Pedro, USdaily low max (Tie)13.3 C (55.9 F)tie27 years3 of 100 (Routine)

Climate Trend

40 complete years, 1919 to 1963
Annual mean temperature at San Pedro as warming stripes, 1919 to 1963 One stripe for each of 40 complete years at San Pedro, 1919 to 1963. Blue stripes are years cooler than the station's own mean of 16.4 C (61.5 F); red stripes are warmer. The coolest year was 1933, at 15.0 C (59.0 F), and the warmest was 1959, at 18.1 C (64.6 F). The strongest colour marks a difference of 1.8 C (3.2 F). 1919: 15.4 C, -1.0 C from the station mean1920: 16.3 C, -0.1 C from the station mean1921: 16.6 C, +0.2 C from the station mean1923: 16.3 C, -0.1 C from the station mean1924: 16.0 C, -0.4 C from the station mean1925: 16.3 C, -0.1 C from the station mean1926: 17.1 C, +0.7 C from the station mean1927: 15.8 C, -0.6 C from the station mean1928: 15.9 C, -0.5 C from the station mean1929: 16.3 C, -0.1 C from the station mean1931: 17.6 C, +1.2 C from the station mean1932: 15.8 C, -0.6 C from the station mean1933: 15.0 C, -1.4 C from the station mean1934: 16.8 C, +0.4 C from the station mean1935: 15.6 C, -0.8 C from the station mean1936: 16.8 C, +0.4 C from the station mean1937: 15.7 C, -0.7 C from the station mean1938: 16.2 C, -0.2 C from the station mean1939: 16.3 C, -0.1 C from the station mean1940: 16.6 C, +0.2 C from the station mean1941: 16.6 C, +0.2 C from the station mean1942: 16.1 C, -0.3 C from the station mean1943: 17.3 C, +0.9 C from the station mean1946: 16.1 C, -0.3 C from the station mean1947: 16.8 C, +0.4 C from the station mean1948: 15.6 C, -0.8 C from the station mean1949: 15.9 C, -0.5 C from the station mean1950: 15.9 C, -0.5 C from the station mean1951: 15.9 C, -0.5 C from the station mean1953: 16.5 C, +0.1 C from the station mean1954: 16.7 C, +0.3 C from the station mean1955: 15.9 C, -0.5 C from the station mean1956: 16.6 C, +0.2 C from the station mean1957: 17.1 C, +0.7 C from the station mean1958: 17.7 C, +1.3 C from the station mean1959: 18.1 C, +1.7 C from the station mean1960: 16.9 C, +0.5 C from the station mean1961: 16.6 C, +0.2 C from the station mean1962: 15.8 C, -0.6 C from the station mean1963: 17.0 C, +0.6 C from the station mean191919251930193519401945195019551960
One stripe for each of 40 complete years at San Pedro, 1919 to 1963. Blue stripes are years cooler than the station's own mean of 16.4 C (61.5 F); red stripes are warmer. The coolest year was 1933, at 15.0 C (59.0 F), and the warmest was 1959, at 18.1 C (64.6 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at San Pedro as warming stripes, 1919 to 1963
YearAnnual mean temperatureDifference from the station mean
191915.4 C-0.96 C
192016.3 C-0.06 C
192116.6 C+0.21 C
192316.3 C-0.05 C
192416.0 C-0.44 C
192516.3 C-0.08 C
192617.1 C+0.75 C
192715.8 C-0.64 C
192815.9 C-0.46 C
192916.3 C-0.07 C
193117.6 C+1.17 C
193215.8 C-0.62 C
193315.0 C-1.37 C
193416.8 C+0.43 C
193515.6 C-0.81 C
193616.8 C+0.40 C
193715.7 C-0.65 C
193816.2 C-0.15 C
193916.3 C-0.08 C
194016.6 C+0.17 C
194116.6 C+0.24 C
194216.1 C-0.25 C
194317.3 C+0.87 C
194616.1 C-0.26 C
194716.8 C+0.37 C
194815.6 C-0.81 C
194915.9 C-0.49 C
195015.9 C-0.48 C
195115.9 C-0.48 C
195316.5 C+0.13 C
195416.7 C+0.30 C
195515.9 C-0.49 C
195616.6 C+0.17 C
195717.1 C+0.71 C
195817.7 C+1.29 C
195918.1 C+1.71 C
196016.9 C+0.52 C
196116.6 C+0.25 C
196215.8 C-0.58 C
196317.0 C+0.62 C

The fitted trend in annual mean temperature here over 1919 to 1963 is 0.2 C (0.0 to 0.3) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.3 F (0.0 to 0.5) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at San Pedro
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.2 C (0.0 to 0.3) per decade0.3 F (0.0 to 0.5) per decade1919 to 196340Not clearly different from zero
Mean daily maximum-0.1 C (-0.2 to 0.1) per decade-0.1 F (-0.4 to 0.2) per decade1919 to 196340Not clearly different from zero
Mean daily minimum0.4 C (0.2 to 0.5) per decade0.6 F (0.4 to 0.9) per decade1919 to 196340Rise

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

1906 to 1964
Yearly extremes at San Pedro: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)38.3 C (100.9 F)193932.8 C (91.0 F)47
Coldest night (TNn)-2.2 C (28.0 F)19373.9 C (39.0 F)47
Wettest day (Rx1day)130.8 mm (5.1 in)195635.6 mm (1.4 in)59
Wettest five days (Rx5day)171.1 mm (6.7 in)195660.3 mm (2.4 in)54
Longest dry spell (CDD)231 days1962120 days56

Hottest day (TXx)

Hottest day (TXx) at San Pedro by year The hottest day of the year at San Pedro, 1906 to 1964. The record is 38.3 C (100.9 F) in 1939, marked on the chart; the median year is 32.8 C (91.0 F). 27.53032.53537.540191019201930194019501960Record: 38.3 C (100.9 F) in 1939
The hottest day of the year at San Pedro, 1906 to 1964. The record is 38.3 C (100.9 F) in 1939, marked on the chart; the median year is 32.8 C (91.0 F).
Hottest day (TXx) at San Pedro by year
YearHottest day (TXx)
1906n/a
1907n/a
1908n/a
1909n/a
1910n/a
1911n/a
1912n/a
1913n/a
1914n/a
1915n/a
1916n/a
1917n/a
191836.1 C (97.0 F)
191930.0 C (86.0 F)
192030.0 C (86.0 F)
192132.2 C (90.0 F)
192233.9 C (93.0 F)
192333.3 C (91.9 F)
192434.4 C (93.9 F)
192530.0 C (86.0 F)
192634.4 C (93.9 F)
192732.8 C (91.0 F)
192828.9 C (84.0 F)
192936.1 C (97.0 F)
193031.7 C (89.1 F)
193135.0 C (95.0 F)
193230.0 C (86.0 F)
193333.3 C (91.9 F)
193432.2 C (90.0 F)
193532.8 C (91.0 F)
193632.8 C (91.0 F)
193731.1 C (88.0 F)
193830.6 C (87.1 F)
193938.3 C (100.9 F)
194033.3 C (91.9 F)
194133.9 C (93.0 F)
194232.2 C (90.0 F)
194336.1 C (97.0 F)
194432.2 C (90.0 F)
194529.4 C (84.9 F)
194632.2 C (90.0 F)
194731.7 C (89.1 F)
194831.7 C (89.1 F)
194937.8 C (100.0 F)
195032.2 C (90.0 F)
195132.8 C (91.0 F)
195230.6 C (87.1 F)
195336.1 C (97.0 F)
195432.2 C (90.0 F)
195537.8 C (100.0 F)
195635.6 C (96.1 F)
195733.3 C (91.9 F)
195836.1 C (97.0 F)
195935.6 C (96.1 F)
196033.9 C (93.0 F)
196136.1 C (97.0 F)
196231.7 C (89.1 F)
196337.2 C (99.0 F)
196431.1 C (88.0 F)

Coldest night (TNn)

Coldest night (TNn) at San Pedro by year The coldest night of the year at San Pedro, 1906 to 1964. The record is -2.2 C (28.0 F) in 1937, marked on the chart; the median year is 3.9 C (39.0 F). -2.502.557.5191019201930194019501960Record: -2.2 C (28.0 F) in 1937
The coldest night of the year at San Pedro, 1906 to 1964. The record is -2.2 C (28.0 F) in 1937, marked on the chart; the median year is 3.9 C (39.0 F).
Coldest night (TNn) at San Pedro by year
YearColdest night (TNn)
1906n/a
1907n/a
1908n/a
1909n/a
1910n/a
1911n/a
1912n/a
1913n/a
1914n/a
1915n/a
1916n/a
1917n/a
19182.2 C (36.0 F)
19191.7 C (35.1 F)
19204.4 C (39.9 F)
19212.8 C (37.0 F)
19224.4 C (39.9 F)
19231.7 C (35.1 F)
19241.1 C (34.0 F)
19253.9 C (39.0 F)
19262.8 C (37.0 F)
19273.9 C (39.0 F)
19283.3 C (37.9 F)
19292.2 C (36.0 F)
19303.9 C (39.0 F)
19313.3 C (37.9 F)
19322.2 C (36.0 F)
19333.9 C (39.0 F)
19344.4 C (39.9 F)
19352.8 C (37.0 F)
19363.9 C (39.0 F)
1937-2.2 C (28.0 F)
19383.9 C (39.0 F)
19393.9 C (39.0 F)
19406.1 C (43.0 F)
19414.4 C (39.9 F)
1942-1.1 C (30.0 F)
19434.4 C (39.9 F)
19443.9 C (39.0 F)
19454.4 C (39.9 F)
19461.1 C (34.0 F)
19473.9 C (39.0 F)
19483.3 C (37.9 F)
19491.7 C (35.1 F)
19502.2 C (36.0 F)
19512.8 C (37.0 F)
19522.8 C (37.0 F)
19533.9 C (39.0 F)
19544.4 C (39.9 F)
19554.4 C (39.9 F)
19563.9 C (39.0 F)
19571.7 C (35.1 F)
19583.9 C (39.0 F)
19596.1 C (43.0 F)
19603.3 C (37.9 F)
19615.0 C (41.0 F)
19624.4 C (39.9 F)
19633.9 C (39.0 F)
19645.6 C (42.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at San Pedro by year The wettest day of the year at San Pedro, 1906 to 1964. The record is 130.8 mm (5.1 in) in 1956, marked on the chart; the median year is 35.6 mm (1.4 in). 050100150191019201930194019501960Record: 130.8 mm (5.1 in) in 1956
The wettest day of the year at San Pedro, 1906 to 1964. The record is 130.8 mm (5.1 in) in 1956, marked on the chart; the median year is 35.6 mm (1.4 in).
Wettest day (Rx1day) at San Pedro by year
YearWettest day (Rx1day)
190626.4 mm (1.0 in)
190743.4 mm (1.7 in)
190835.6 mm (1.4 in)
190950.8 mm (2.0 in)
191027.7 mm (1.1 in)
191146.5 mm (1.8 in)
191247.0 mm (1.9 in)
191348.8 mm (1.9 in)
1914107.7 mm (4.2 in)
191542.7 mm (1.7 in)
191670.6 mm (2.8 in)
191735.6 mm (1.4 in)
191826.7 mm (1.1 in)
191927.9 mm (1.1 in)
192022.9 mm (0.9 in)
192169.1 mm (2.7 in)
192225.4 mm (1.0 in)
192330.7 mm (1.2 in)
192425.4 mm (1.0 in)
192520.3 mm (0.8 in)
192644.5 mm (1.8 in)
192774.4 mm (2.9 in)
192836.8 mm (1.4 in)
192943.2 mm (1.7 in)
193055.9 mm (2.2 in)
193154.4 mm (2.1 in)
193224.9 mm (1.0 in)
193326.7 mm (1.1 in)
193430.7 mm (1.2 in)
193522.9 mm (0.9 in)
193625.9 mm (1.0 in)
193788.9 mm (3.5 in)
193843.7 mm (1.7 in)
193929.0 mm (1.1 in)
194053.1 mm (2.1 in)
194151.1 mm (2.0 in)
194227.9 mm (1.1 in)
194325.7 mm (1.0 in)
194434.0 mm (1.3 in)
194559.7 mm (2.4 in)
194656.9 mm (2.2 in)
194721.6 mm (0.9 in)
194821.6 mm (0.9 in)
194942.2 mm (1.7 in)
195027.4 mm (1.1 in)
195135.8 mm (1.4 in)
195233.3 mm (1.3 in)
195319.3 mm (0.8 in)
195451.3 mm (2.0 in)
195525.9 mm (1.0 in)
1956130.8 mm (5.1 in)
195730.2 mm (1.2 in)
195890.4 mm (3.6 in)
195943.7 mm (1.7 in)
196034.5 mm (1.4 in)
196130.7 mm (1.2 in)
196275.2 mm (3.0 in)
196366.8 mm (2.6 in)
196412.2 mm (0.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at San Pedro by year The wettest five days of the year at San Pedro, 1906 to 1964. The record is 171.1 mm (6.7 in) in 1956, marked on the chart; the median year is 60.3 mm (2.4 in). 050100150200191019201930194019501960Record: 171.1 mm (6.7 in) in 1956
The wettest five days of the year at San Pedro, 1906 to 1964. The record is 171.1 mm (6.7 in) in 1956, marked on the chart; the median year is 60.3 mm (2.4 in).
Wettest five days (Rx5day) at San Pedro by year
YearWettest five days (Rx5day)
190650.6 mm (2.0 in)
190768.7 mm (2.7 in)
190877.3 mm (3.0 in)
190965.2 mm (2.6 in)
1910n/a
1911n/a
191226.8 mm (1.1 in)
1913n/a
1914n/a
1915n/a
1916112.5 mm (4.4 in)
191735.4 mm (1.4 in)
191821.8 mm (0.9 in)
191938.8 mm (1.5 in)
192047.0 mm (1.9 in)
1921101.3 mm (4.0 in)
192260.0 mm (2.4 in)
192363.2 mm (2.5 in)
192438.8 mm (1.5 in)
192525.2 mm (1.0 in)
1926101.1 mm (4.0 in)
1927107.4 mm (4.2 in)
192847.0 mm (1.9 in)
192951.3 mm (2.0 in)
193079.0 mm (3.1 in)
193160.5 mm (2.4 in)
193257.9 mm (2.3 in)
193343.7 mm (1.7 in)
193472.9 mm (2.9 in)
193539.4 mm (1.6 in)
193673.6 mm (2.9 in)
1937103.9 mm (4.1 in)
1938121.8 mm (4.8 in)
193937.9 mm (1.5 in)
194091.6 mm (3.6 in)
194186.6 mm (3.4 in)
194235.1 mm (1.4 in)
194363.0 mm (2.5 in)
194486.0 mm (3.4 in)
1945105.3 mm (4.1 in)
1946113.6 mm (4.5 in)
194728.2 mm (1.1 in)
194822.1 mm (0.9 in)
194967.3 mm (2.6 in)
195043.9 mm (1.7 in)
195156.3 mm (2.2 in)
1952101.1 mm (4.0 in)
195328.9 mm (1.1 in)
195485.4 mm (3.4 in)
195535.6 mm (1.4 in)
1956171.1 mm (6.7 in)
195741.2 mm (1.6 in)
195890.4 mm (3.6 in)
195951.8 mm (2.0 in)
196040.1 mm (1.6 in)
196141.4 mm (1.6 in)
1962144.5 mm (5.7 in)
196392.0 mm (3.6 in)
196423.9 mm (0.9 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at San Pedro by year The longest dry spell of the year at San Pedro, 1906 to 1964. The record is 231 days in 1962, marked on the chart; the median year is 120 days. 0100200300191019201930194019501960Record: 231 days in 1962
The longest dry spell of the year at San Pedro, 1906 to 1964. The record is 231 days in 1962, marked on the chart; the median year is 120 days.
Longest dry spell (CDD) at San Pedro by year
YearLongest dry spell (CDD)
190616 days
19071 day
1908n/a
19091 day
19102 days
19112 days
19121 day
19131 day
19141 day
19151 day
1916n/a
1917n/a
191864 days
191935 days
192078 days
192162 days
1922170 days
1923103 days
1924165 days
1925122 days
1926149 days
1927198 days
1928154 days
1929104 days
193088 days
1931100 days
1932116 days
193377 days
1934100 days
1935118 days
193667 days
1937129 days
1938123 days
1939112 days
1940112 days
1941172 days
1942189 days
1943220 days
1944196 days
1945146 days
1946144 days
1947196 days
1948183 days
1949100 days
1950186 days
1951178 days
1952147 days
1953168 days
1954196 days
1955190 days
1956210 days
1957142 days
1958134 days
1959149 days
1960189 days
1961110 days
1962231 days
196384 days
196483 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

41 years, 1923 to 1963

A day with at least 36.4 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 143.0 mm (5.6 in) of rain is expected about once in 100 years.

Rainfall return levels at San Pedro: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years36.4 mm (1.4 in)
5 years54.7 mm (2.2 in)
10 years70.0 mm (2.8 in)
25 years94.3 mm (3.7 in)
50 years116.5 mm (4.6 in)Longer than the 41 years of record
100 years143.0 mm (5.6 in)Longer than the 41 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, 41 years of values from 1923 to 1963.

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: 130.8 mm (5.1 in) in 1956; 90.4 mm (3.6 in) in 1958; 88.9 mm (3.5 in) in 1937.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

  • Data for San Pedro standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for San Pedro 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

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