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Built 2026-10-16 (16 October 2026)

Upper San Leandro Filters Weather Records (USC00049185)

Record envelope, standing records and threshold days for Upper San Leandro Filters (USC00049185), California, United States, with 79 years of record.

Key Facts for Upper San Leandro Filters

  • Upper San Leandro Filters (USC00049185) is a weather station in California, United States at 37.77 latitude and -122.17 longitude, 120 m (394 ft) above sea level.
  • The station reports from 1948 to 2026, 79 years of record.
  • 1,464 records set at Upper San Leandro Filters still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Upper San Leandro Filters set a daily record precipitation of 26.2 mm (1.0 in) on 20 April 2026.

About the Station

  • Location: California, United States, 37.77 latitude, -122.17 longitude.
  • Elevation: 120 m (394 ft).
  • Period of record: 1948 to 2026, 79 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 Upper San Leandro Filters, with 2026 drawn through them The band shows the record high and record low for each calendar day at Upper San Leandro Filters. 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 Upper San Leandro Filters. 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 Upper San Leandro Filters, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan22.8 C (73.0 F)-3.3 C (26.1 F)n/an/a
Feb26.7 C (80.1 F)-3.3 C (26.1 F)n/an/a
Mar28.3 C (82.9 F)-1.7 C (28.9 F)n/an/a
Apr36.1 C (97.0 F)-1.1 C (30.0 F)n/an/a
May37.2 C (99.0 F)1.7 C (35.1 F)n/an/a
Jun40.0 C (104.0 F)5.0 C (41.0 F)n/an/a
Jul39.4 C (102.9 F)6.7 C (44.1 F)n/an/a
Aug37.8 C (100.0 F)6.1 C (43.0 F)n/an/a
Sep40.0 C (104.0 F)5.0 C (41.0 F)n/an/a
Oct39.4 C (102.9 F)0.0 C (32.0 F)n/an/a
Nov32.2 C (90.0 F)-1.1 C (30.0 F)n/an/a
Dec24.4 C (75.9 F)-7.8 C (18.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Upper San Leandro Filters by the year they were set 1,464 records at Upper San Leandro Filters still stand. 1976 holds the most, with 87. 02550751001958: 331959: 551960: 521961: 541962: 631963: 351964: 521965: 421966: 361967: 441968: 401969: 321970: 651971: 481972: 581973: 681974: 391975: 591976: 871977: 391978: 461979: 381980: 241981: 391982: 231983: 401984: 511985: 401986: 341987: 371988: 361989: 461990: 9195819621966197019741978198219861990
1,464 records at Upper San Leandro Filters still stand. 1976 holds the most, with 87.
Standing records at Upper San Leandro Filters by the year they were set
Year setStanding records
195833
195955
196052
196154
196263
196335
196452
196542
196636
196744
196840
196932
197065
197148
197258
197368
197439
197559
197687
197739
197846
197938
198024
198139
198223
198340
198451
198540
198634
198737
198836
198946
19909

All-Time Record Progression

1 new records
When Upper San Leandro Filters set new all-time records 1 all-time records were set at Upper San Leandro Filters between 24 October 2021 and 24 October 2021. Each dot is a new record. Record daily precipitation24 October 2021: Record daily precipitation 139.7 mm (5.5 in)
1 all-time records were set at Upper San Leandro Filters between 24 October 2021 and 24 October 2021. Each dot is a new record.
When Upper San Leandro Filters set new all-time records
DateKindDetail
2021-10-24Record daily precipitationRecord daily precipitation 139.7 mm (5.5 in)

Wettest Day of Each Month

Oct: 139.7 mm (5.5 in)
Record daily precipitation for each month at Upper San Leandro Filters The wettest day on record for each calendar month at Upper San Leandro Filters. The most was 139.7 mm (5.5 in) on 24 October 2021. 050100150 Jan: 118.4 mm (4.7 in), 5 January 1982 Jan Feb: 97.5 mm (3.8 in), 13 February 2000 Feb Mar: 66.0 mm (2.6 in), 13 March 1983 Mar Apr: 57.7 mm (2.3 in), 6 April 2018 Apr May: 54.6 mm (2.1 in), 16 May 1996 May Jun: 29.2 mm (1.1 in), 4 June 2011 Jun Jul: 28.2 mm (1.1 in), 9 July 1974 Jul Aug: 31.2 mm (1.2 in), 20 August 1997 Aug Sep: 58.7 mm (2.3 in), 19 September 1959 Sep Oct: 139.7 mm (5.5 in), 24 October 2021 Oct Nov: 107.4 mm (4.2 in), 6 November 1994 Nov Dec: 102.6 mm (4.0 in), 11 December 2014 Dec
The wettest day on record for each calendar month at Upper San Leandro Filters. The most was 139.7 mm (5.5 in) on 24 October 2021.
Record daily precipitation for each month at Upper San Leandro Filters
MonthRecord daily precipitation (mm)Date
Jan118.4 mm (4.7 in)5 January 1982
Feb97.5 mm (3.8 in)13 February 2000
Mar66.0 mm (2.6 in)13 March 1983
Apr57.7 mm (2.3 in)6 April 2018
May54.6 mm (2.1 in)16 May 1996
Jun29.2 mm (1.1 in)4 June 2011
Jul28.2 mm (1.1 in)9 July 1974
Aug31.2 mm (1.2 in)20 August 1997
Sep58.7 mm (2.3 in)19 September 1959
Oct139.7 mm (5.5 in)24 October 2021
Nov107.4 mm (4.2 in)6 November 1994
Dec102.6 mm (4.0 in)11 December 2014

Period of Record Coverage

1958 to 1990
Days with data per year at Upper San Leandro Filters 33 years of record at Upper San Leandro Filters, 1958 to 1990. 3 years have data for under 90 percent of days and are left out of rankings: 1958, 1988, 1990. 1958: 153 of 365 days1959: 363 of 365 days1960: 342 of 366 days1961: 355 of 365 days1962: 365 of 365 days1963: 365 of 365 days1964: 366 of 366 days1965: 334 of 365 days1966: 365 of 365 days1967: 349 of 365 days1968: 362 of 366 days1969: 361 of 365 days1970: 364 of 365 days1971: 363 of 365 days1972: 366 of 366 days1973: 334 of 365 days1974: 335 of 365 days1975: 365 of 365 days1976: 366 of 366 days1977: 365 of 365 days1978: 364 of 365 days1979: 365 of 365 days1980: 364 of 366 days1981: 364 of 365 days1982: 365 of 365 days1983: 362 of 365 days1984: 366 of 366 days1985: 364 of 365 days1986: 363 of 365 days1987: 364 of 365 days1988: 304 of 366 days1989: 365 of 365 days1990: 87 of 365 days1960196519701975198019851990
33 years of record at Upper San Leandro Filters, 1958 to 1990. 3 years have data for under 90 percent of days and are left out of rankings: 1958, 1988, 1990.
Days with data per year at Upper San Leandro Filters
YearDays with dataShare of yearComplete
195815342%No
195936399%Yes
196034293%Yes
196135597%Yes
1962365100%Yes
1963365100%Yes
1964366100%Yes
196533492%Yes
1966365100%Yes
196734996%Yes
196836299%Yes
196936199%Yes
1970364100%Yes
197136399%Yes
1972366100%Yes
197333492%Yes
197433592%Yes
1975365100%Yes
1976366100%Yes
1977365100%Yes
1978364100%Yes
1979365100%Yes
198036499%Yes
1981364100%Yes
1982365100%Yes
198336299%Yes
1984366100%Yes
1985364100%Yes
198636399%Yes
1987364100%Yes
198830483%No
1989365100%Yes
19908724%No

Latest Records

20
Latest records at Upper San Leandro Filters
DateStationRecordValueBeat old record byOld record stoodSignificance
20 April 2026Upper San Leandro Filters, USdaily rain26.2 mm (1.0 in)3.8 mm (0.15 in)24 years18 of 100 (Routine)
4 February 2025Upper San Leandro Filters, USdaily rain38.1 mm (1.5 in)7.6 mm (0.30 in)76 years35 of 100 (Notable)
24 August 2024Upper San Leandro Filters, USdaily rain1.3 mm (0.05 in)0.5 mm (0.02 in)47 years20 of 100 (Routine)
4 May 2024Upper San Leandro Filters, USdaily rain25.4 mm (1.0 in)0.3 mm (0.01 in)21 years13 of 100 (Routine)
2 May 2023Upper San Leandro Filters, USdaily rain20.1 mm (0.8 in)14.8 mm (0.6 in)28 years20 of 100 (Routine)
21 March 2023Upper San Leandro Filters, USdaily rain33.5 mm (1.3 in)9.4 mm (0.37 in)17 years21 of 100 (Routine)
24 February 2023Upper San Leandro Filters, USdaily rain18.8 mm (0.7 in)0.5 mm (0.02 in)40 years19 of 100 (Routine)
31 December 2022Upper San Leandro Filters, USdaily rain99.8 mm (3.9 in)45.2 mm (1.8 in)16 years45 of 100 (Notable)
30 December 2022Upper San Leandro Filters, USdaily rain62.2 mm (2.4 in)11.1 mm (0.4 in)40 years27 of 100 (Routine)
27 December 2022Upper San Leandro Filters, USdaily rain61.2 mm (2.4 in)5.8 mm (0.23 in)48 years25 of 100 (Routine)
8 November 2022Upper San Leandro Filters, USdaily rain32.0 mm (1.3 in)3.0 mm (0.12 in)37 years20 of 100 (Routine)
13 December 2021Upper San Leandro Filters, USdaily rain96.8 mm (3.8 in)43.0 mm (1.7 in)19 years44 of 100 (Notable)
24 October 2021Upper San Leandro Filters, USall-time rain139.7 mm (5.5 in)10.7 mm (0.4 in)59 years50 of 100 (Notable)
14 June 2021Upper San Leandro Filters, USdaily rain1.3 mm (0.05 in)0.8 mm (0.03 in)26 years15 of 100 (Routine)
12 September 2020Upper San Leandro Filters, USdaily rain (Tie)0.5 mm (0.02 in)tie11 years2 of 100 (Routine)
16 August 2020Upper San Leandro Filters, USdaily rain1.0 mm (0.04 in)1.0 mm (0.04 in)72 years20 of 100 (Routine)
17 May 2020Upper San Leandro Filters, USdaily rain14.7 mm (0.6 in)0.2 mm (0.01 in)24 years14 of 100 (Routine)
16 September 2019Upper San Leandro Filters, USdaily rain6.6 mm (0.26 in)3.3 mm (0.13 in)32 years19 of 100 (Routine)
18 May 2019Upper San Leandro Filters, USdaily rain18.5 mm (0.7 in)7.1 mm (0.28 in)69 years20 of 100 (Routine)
15 May 2019Upper San Leandro Filters, USdaily rain20.1 mm (0.8 in)15.5 mm (0.6 in)8 years20 of 100 (Routine)

Climate Trend

26 complete years, 1959 to 1989
Annual mean temperature at Upper San Leandro Filters as warming stripes, 1959 to 1989 One stripe for each of 26 complete years at Upper San Leandro Filters, 1959 to 1989. Blue stripes are years cooler than the station's own mean of 14.1 C (57.4 F); red stripes are warmer. The coolest year was 1975, at 12.6 C (54.7 F), and the warmest was 1986, at 15.2 C (59.4 F). The strongest colour marks a difference of 1.5 C (2.7 F). 1959: 14.6 C, +0.5 C from the station mean1960: 13.7 C, -0.4 C from the station mean1961: 13.6 C, -0.5 C from the station mean1962: 13.3 C, -0.8 C from the station mean1963: 13.7 C, -0.4 C from the station mean1964: 13.5 C, -0.6 C from the station mean1966: 13.9 C, -0.2 C from the station mean1968: 13.9 C, -0.2 C from the station mean1969: 13.3 C, -0.8 C from the station mean1970: 13.2 C, -0.9 C from the station mean1971: 13.0 C, -1.1 C from the station mean1972: 13.2 C, -0.9 C from the station mean1975: 12.6 C, -1.5 C from the station mean1976: 14.1 C, 0.0 C from the station mean1977: 14.5 C, +0.4 C from the station mean1978: 14.9 C, +0.8 C from the station mean1979: 14.9 C, +0.8 C from the station mean1980: 14.8 C, +0.7 C from the station mean1981: 14.9 C, +0.8 C from the station mean1982: 13.8 C, -0.3 C from the station mean1983: 15.0 C, +0.9 C from the station mean1984: 15.1 C, +1.0 C from the station mean1985: 14.2 C, +0.1 C from the station mean1986: 15.2 C, +1.1 C from the station mean1987: 15.0 C, +0.9 C from the station mean1989: 14.5 C, +0.4 C from the station mean195919651970197519801985
One stripe for each of 26 complete years at Upper San Leandro Filters, 1959 to 1989. Blue stripes are years cooler than the station's own mean of 14.1 C (57.4 F); red stripes are warmer. The coolest year was 1975, at 12.6 C (54.7 F), and the warmest was 1986, at 15.2 C (59.4 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Upper San Leandro Filters as warming stripes, 1959 to 1989
YearAnnual mean temperatureDifference from the station mean
195914.6 C+0.55 C
196013.7 C-0.41 C
196113.6 C-0.48 C
196213.3 C-0.76 C
196313.7 C-0.42 C
196413.5 C-0.57 C
196613.9 C-0.24 C
196813.9 C-0.16 C
196913.3 C-0.81 C
197013.2 C-0.88 C
197113.0 C-1.14 C
197213.2 C-0.94 C
197512.6 C-1.46 C
197614.1 C+0.05 C
197714.5 C+0.39 C
197814.9 C+0.84 C
197914.9 C+0.76 C
198014.8 C+0.66 C
198114.9 C+0.85 C
198213.8 C-0.28 C
198315.0 C+0.91 C
198415.1 C+0.97 C
198514.2 C+0.13 C
198615.2 C+1.11 C
198715.0 C+0.92 C
198914.5 C+0.43 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

1948 to 2026
Yearly extremes at Upper San Leandro Filters: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)40.0 C (104.0 F)196036.7 C (98.1 F)33
Coldest night (TNn)-7.8 C (18.0 F)1972-1.1 C (30.0 F)33
Wettest day (Rx1day)139.7 mm (5.5 in)202154.1 mm (2.1 in)73
Wettest five days (Rx5day)333.0 mm (13.1 in)1962105.2 mm (4.1 in)73
Longest dry spell (CDD)218 days2018111 days73

Hottest day (TXx)

Hottest day (TXx) at Upper San Leandro Filters by year The hottest day of the year at Upper San Leandro Filters, 1948 to 2026. The record is 40.0 C (104.0 F) in 1960, marked on the chart; the median year is 36.7 C (98.1 F). 20253035401960198020002020Record: 40.0 C (104.0 F) in 1960
The hottest day of the year at Upper San Leandro Filters, 1948 to 2026. The record is 40.0 C (104.0 F) in 1960, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Upper San Leandro Filters by year
YearHottest day (TXx)
1948n/a
1949n/a
1950n/a
1951n/a
195835.0 C (95.0 F)
195937.2 C (99.0 F)
196040.0 C (104.0 F)
196139.4 C (102.9 F)
196233.9 C (93.0 F)
196333.9 C (93.0 F)
196435.6 C (96.1 F)
196532.2 C (90.0 F)
196635.6 C (96.1 F)
196732.8 C (91.0 F)
196837.8 C (100.0 F)
196932.2 C (90.0 F)
197036.1 C (97.0 F)
197140.0 C (104.0 F)
197238.9 C (102.0 F)
197337.8 C (100.0 F)
197433.3 C (91.9 F)
197536.1 C (97.0 F)
197637.8 C (100.0 F)
197734.4 C (93.9 F)
197835.6 C (96.1 F)
197940.0 C (104.0 F)
198038.9 C (102.0 F)
198136.7 C (98.1 F)
198236.7 C (98.1 F)
198337.8 C (100.0 F)
198437.8 C (100.0 F)
198536.7 C (98.1 F)
198636.7 C (98.1 F)
198739.4 C (102.9 F)
198839.4 C (102.9 F)
198935.6 C (96.1 F)
199022.8 C (73.0 F)
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005n/a
2006n/a
2007n/a
2008n/a
2009n/a
2010n/a
2011n/a
2012n/a
2013n/a
2014n/a
2015n/a
2016n/a
2017n/a
2018n/a
2019n/a
2020n/a
2021n/a
2022n/a
2023n/a
2024n/a
2025n/a
2026n/a

Coldest night (TNn)

Coldest night (TNn) at Upper San Leandro Filters by year The coldest night of the year at Upper San Leandro Filters, 1948 to 2026. The record is -7.8 C (18.0 F) in 1972, marked on the chart; the median year is -1.1 C (30.0 F). -10-5051960198020002020Record: -7.8 C (18.0 F) in 1972
The coldest night of the year at Upper San Leandro Filters, 1948 to 2026. The record is -7.8 C (18.0 F) in 1972, marked on the chart; the median year is -1.1 C (30.0 F).
Coldest night (TNn) at Upper San Leandro Filters by year
YearColdest night (TNn)
1948n/a
1949n/a
1950n/a
1951n/a
19580.0 C (32.0 F)
1959-0.6 C (30.9 F)
1960-2.2 C (28.0 F)
1961-3.3 C (26.1 F)
1962-3.3 C (26.1 F)
1963-0.6 C (30.9 F)
19640.6 C (33.1 F)
1965-1.7 C (28.9 F)
1966-2.2 C (28.0 F)
1967-1.7 C (28.9 F)
1968-2.8 C (27.0 F)
1969-2.2 C (28.0 F)
19700.0 C (32.0 F)
1971-1.1 C (30.0 F)
1972-7.8 C (18.0 F)
1973-1.1 C (30.0 F)
1974-1.7 C (28.9 F)
1975-2.2 C (28.0 F)
1976-3.3 C (26.1 F)
19770.0 C (32.0 F)
1978-3.3 C (26.1 F)
19790.0 C (32.0 F)
19801.1 C (34.0 F)
19812.8 C (37.0 F)
19820.6 C (33.1 F)
19831.7 C (35.1 F)
19840.6 C (33.1 F)
19850.0 C (32.0 F)
19862.8 C (37.0 F)
19870.0 C (32.0 F)
19880.0 C (32.0 F)
1989-1.7 C (28.9 F)
1990-1.7 C (28.9 F)
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005n/a
2006n/a
2007n/a
2008n/a
2009n/a
2010n/a
2011n/a
2012n/a
2013n/a
2014n/a
2015n/a
2016n/a
2017n/a
2018n/a
2019n/a
2020n/a
2021n/a
2022n/a
2023n/a
2024n/a
2025n/a
2026n/a

Wettest day (Rx1day)

Wettest day (Rx1day) at Upper San Leandro Filters by year The wettest day of the year at Upper San Leandro Filters, 1948 to 2026. The record is 139.7 mm (5.5 in) in 2021, marked on the chart; the median year is 54.1 mm (2.1 in). 0501001501960198020002020Record: 139.7 mm (5.5 in) in 2021
The wettest day of the year at Upper San Leandro Filters, 1948 to 2026. The record is 139.7 mm (5.5 in) in 2021, marked on the chart; the median year is 54.1 mm (2.1 in).
Wettest day (Rx1day) at Upper San Leandro Filters by year
YearWettest day (Rx1day)
194820.8 mm (0.8 in)
194930.5 mm (1.2 in)
195067.1 mm (2.6 in)
195135.8 mm (1.4 in)
195834.3 mm (1.4 in)
195958.7 mm (2.3 in)
196049.5 mm (1.9 in)
196148.3 mm (1.9 in)
1962129.0 mm (5.1 in)
196349.8 mm (2.0 in)
196454.6 mm (2.1 in)
196535.6 mm (1.4 in)
196640.6 mm (1.6 in)
196776.5 mm (3.0 in)
196868.6 mm (2.7 in)
196952.8 mm (2.1 in)
197061.0 mm (2.4 in)
197145.0 mm (1.8 in)
197237.8 mm (1.5 in)
197387.4 mm (3.4 in)
197455.9 mm (2.2 in)
197551.6 mm (2.0 in)
197636.1 mm (1.4 in)
197758.4 mm (2.3 in)
197864.3 mm (2.5 in)
197967.3 mm (2.6 in)
198042.7 mm (1.7 in)
198171.1 mm (2.8 in)
1982118.4 mm (4.7 in)
198366.0 mm (2.6 in)
198449.0 mm (1.9 in)
198548.3 mm (1.9 in)
198659.2 mm (2.3 in)
198791.4 mm (3.6 in)
198845.7 mm (1.8 in)
198951.6 mm (2.0 in)
199047.0 mm (1.9 in)
199154.1 mm (2.1 in)
199251.6 mm (2.0 in)
199362.2 mm (2.4 in)
1994107.4 mm (4.2 in)
199564.5 mm (2.5 in)
199676.2 mm (3.0 in)
199748.8 mm (1.9 in)
199894.2 mm (3.7 in)
199954.9 mm (2.2 in)
2000109.7 mm (4.3 in)
200145.0 mm (1.8 in)
200257.9 mm (2.3 in)
200346.0 mm (1.8 in)
200446.5 mm (1.8 in)
200575.2 mm (3.0 in)
200653.8 mm (2.1 in)
200737.1 mm (1.5 in)
200862.7 mm (2.5 in)
200991.4 mm (3.6 in)
201047.2 mm (1.9 in)
201135.1 mm (1.4 in)
201261.7 mm (2.4 in)
201327.2 mm (1.1 in)
2014102.6 mm (4.0 in)
201542.9 mm (1.7 in)
201655.4 mm (2.2 in)
201767.1 mm (2.6 in)
201861.5 mm (2.4 in)
201947.0 mm (1.9 in)
202025.4 mm (1.0 in)
2021139.7 mm (5.5 in)
202299.8 mm (3.9 in)
202341.1 mm (1.6 in)
202454.4 mm (2.1 in)
202553.3 mm (2.1 in)
202630.2 mm (1.2 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Upper San Leandro Filters by year The wettest five days of the year at Upper San Leandro Filters, 1948 to 2026. The record is 333.0 mm (13.1 in) in 1962, marked on the chart; the median year is 105.2 mm (4.1 in). 01002003004001960198020002020Record: 333.0 mm (13.1 in) in 1962
The wettest five days of the year at Upper San Leandro Filters, 1948 to 2026. The record is 333.0 mm (13.1 in) in 1962, marked on the chart; the median year is 105.2 mm (4.1 in).
Wettest five days (Rx5day) at Upper San Leandro Filters by year
YearWettest five days (Rx5day)
194837.8 mm (1.5 in)
194954.6 mm (2.1 in)
1950138.2 mm (5.4 in)
195178.5 mm (3.1 in)
195841.7 mm (1.6 in)
195984.1 mm (3.3 in)
196091.5 mm (3.6 in)
1961110.0 mm (4.3 in)
1962333.0 mm (13.1 in)
1963110.0 mm (4.3 in)
1964105.4 mm (4.1 in)
196589.5 mm (3.5 in)
196681.0 mm (3.2 in)
1967180.9 mm (7.1 in)
196894.0 mm (3.7 in)
1969107.9 mm (4.2 in)
1970130.3 mm (5.1 in)
197157.7 mm (2.3 in)
197286.7 mm (3.4 in)
1973123.7 mm (4.9 in)
1974105.2 mm (4.1 in)
197597.5 mm (3.8 in)
197658.8 mm (2.3 in)
197784.1 mm (3.3 in)
1978129.4 mm (5.1 in)
1979137.7 mm (5.4 in)
1980122.2 mm (4.8 in)
1981104.0 mm (4.1 in)
1982174.1 mm (6.9 in)
1983123.7 mm (4.9 in)
198496.0 mm (3.8 in)
198566.6 mm (2.6 in)
1986204.6 mm (8.1 in)
1987111.8 mm (4.4 in)
198884.3 mm (3.3 in)
198983.1 mm (3.3 in)
199075.7 mm (3.0 in)
199180.8 mm (3.2 in)
1992130.0 mm (5.1 in)
199393.4 mm (3.7 in)
1994141.2 mm (5.6 in)
1995154.8 mm (6.1 in)
1996100.3 mm (3.9 in)
1997119.7 mm (4.7 in)
1998174.0 mm (6.9 in)
199983.5 mm (3.3 in)
2000142.3 mm (5.6 in)
2001102.9 mm (4.1 in)
2002159.4 mm (6.3 in)
200359.2 mm (2.3 in)
2004111.2 mm (4.4 in)
2005122.7 mm (4.8 in)
2006112.3 mm (4.4 in)
200780.0 mm (3.1 in)
2008106.6 mm (4.2 in)
2009113.5 mm (4.5 in)
2010127.9 mm (5.0 in)
201182.6 mm (3.3 in)
2012107.9 mm (4.2 in)
201349.3 mm (1.9 in)
2014148.8 mm (5.9 in)
201588.4 mm (3.5 in)
2016121.2 mm (4.8 in)
2017142.1 mm (5.6 in)
201887.9 mm (3.5 in)
201997.1 mm (3.8 in)
202035.3 mm (1.4 in)
2021188.1 mm (7.4 in)
2022235.1 mm (9.3 in)
2023174.2 mm (6.9 in)
202475.7 mm (3.0 in)
202586.9 mm (3.4 in)
202677.0 mm (3.0 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Upper San Leandro Filters by year The longest dry spell of the year at Upper San Leandro Filters, 1948 to 2026. The record is 218 days in 2018, marked on the chart; the median year is 111 days. 0501001502002501960198020002020Record: 218 days in 2018
The longest dry spell of the year at Upper San Leandro Filters, 1948 to 2026. The record is 218 days in 2018, marked on the chart; the median year is 111 days.
Longest dry spell (CDD) at Upper San Leandro Filters by year
YearLongest dry spell (CDD)
1948102 days
194972 days
1950171 days
1951109 days
195853 days
1959117 days
196091 days
196175 days
1962102 days
1963113 days
196482 days
1965111 days
196681 days
1967121 days
196886 days
1969121 days
1970131 days
1971150 days
1972107 days
1973111 days
197483 days
197559 days
197664 days
1977120 days
1978136 days
1979160 days
1980100 days
1981128 days
198277 days
1983104 days
198484 days
198546 days
198680 days
1987145 days
1988128 days
1989103 days
1990114 days
199171 days
199278 days
1993129 days
1994138 days
1995136 days
1996116 days
199750 days
199857 days
199994 days
200031 days
200188 days
200271 days
2003177 days
2004113 days
2005118 days
2006132 days
2007140 days
2008162 days
2009101 days
2010141 days
201196 days
2012139 days
201387 days
2014152 days
201563 days
2016160 days
2017143 days
2018218 days
2019117 days
202089 days
2021127 days
2022104 days
2023166 days
2024111 days
2025142 days
202695 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

67 years, 1949 to 2025

A day with at least 55.2 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 147.1 mm (5.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Upper San Leandro Filters: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years55.2 mm (2.2 in)
5 years74.5 mm (2.9 in)
10 years89.2 mm (3.5 in)
25 years110.2 mm (4.3 in)
50 years127.7 mm (5.0 in)
100 years147.1 mm (5.8 in)Longer than the 67 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, 67 years of values from 1949 to 2025.

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: 139.7 mm (5.5 in) in 2021; 129.0 mm (5.1 in) in 1962; 118.4 mm (4.7 in) in 1982.

Download the Data

  • Data for Upper San Leandro Filters standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Upper San Leandro Filters 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 . Last revised (2026-10-12).