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Built 2026-10-19 (19 October 2026)

Napa Weather Records (USC00046065)

Record envelope, standing records and threshold days for Napa (USC00046065), California, United States, with 63 years of record.

Key Facts for Napa

  • Napa (USC00046065) is a weather station in California, United States at 38.30 latitude and -122.28 longitude, 6 m (20 ft) above sea level.
  • The station reports from 1903 to 1965, 63 years of record.
  • 1,464 records set at Napa still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Napa set a daily record precipitation of 19.3 mm (0.8 in) on 12 December 1965.

About the Station

  • Location: California, United States, 38.30 latitude, -122.28 longitude.
  • Elevation: 6 m (20 ft).
  • Period of record: 1903 to 1965, 63 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Napa, with 2026 drawn through them The band shows the record high and record low for each calendar day at Napa. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -1001020304050 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Napa. 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 Napa, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan23.3 C (73.9 F)-5.0 C (23.0 F)n/an/a
Feb25.6 C (78.1 F)-3.9 C (25.0 F)n/an/a
Mar32.8 C (91.0 F)-2.8 C (27.0 F)n/an/a
Apr32.8 C (91.0 F)-2.2 C (28.0 F)n/an/a
May39.4 C (102.9 F)-2.2 C (28.0 F)n/an/a
Jun40.6 C (105.1 F)3.3 C (37.9 F)n/an/a
Jul43.9 C (111.0 F)3.9 C (39.0 F)n/an/a
Aug39.4 C (102.9 F)3.9 C (39.0 F)n/an/a
Sep43.3 C (109.9 F)-1.1 C (30.0 F)n/an/a
Oct36.1 C (97.0 F)-1.7 C (28.9 F)n/an/a
Nov28.3 C (82.9 F)-4.4 C (24.1 F)n/an/a
Dec24.4 C (75.9 F)-5.0 C (23.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Napa by the year they were set 1,464 records at Napa still stand. 1909 holds the most, with 165. 0501001502001903: 111904: 1291905: 1331906: 1271907: 1261908: 1361909: 1651910: 1271911: 861912: 1101913: 1161914: 1521915: 461903190519071909191119131915
1,464 records at Napa still stand. 1909 holds the most, with 165.
Standing records at Napa by the year they were set
Year setStanding records
190311
1904129
1905133
1906127
1907126
1908136
1909165
1910127
191186
1912110
1913116
1914152
191546

Wettest Day of Each Month

Dec: 127.0 mm (5.0 in)
Record daily precipitation for each month at Napa The wettest day on record for each calendar month at Napa. The most was 127.0 mm (5.0 in) on 31 December 1915. 050100150 Jan: 79.2 mm (3.1 in), 12 January 1906 Jan Feb: 101.6 mm (4.0 in), 12 February 1904 Feb Mar: 70.6 mm (2.8 in), 10 March 1904 Mar Apr: 58.9 mm (2.3 in), 3 April 1958 Apr May: 44.7 mm (1.8 in), 26 May 1906 May Jun: 24.6 mm (1.0 in), 1 June 1948 Jun Jul: 2.5 mm (0.10 in), 28 July 1964 Jul Aug: 6.6 mm (0.26 in), 28 August 1954 Aug Sep: 52.8 mm (2.1 in), 23 September 1904 Sep Oct: 108.0 mm (4.3 in), 12 October 1962 Oct Nov: 50.8 mm (2.0 in), 5 November 1912 Nov Dec: 127.0 mm (5.0 in), 31 December 1915 Dec
The wettest day on record for each calendar month at Napa. The most was 127.0 mm (5.0 in) on 31 December 1915.
Record daily precipitation for each month at Napa
MonthRecord daily precipitation (mm)Date
Jan79.2 mm (3.1 in)12 January 1906
Feb101.6 mm (4.0 in)12 February 1904
Mar70.6 mm (2.8 in)10 March 1904
Apr58.9 mm (2.3 in)3 April 1958
May44.7 mm (1.8 in)26 May 1906
Jun24.6 mm (1.0 in)1 June 1948
Jul2.5 mm (0.10 in)28 July 1964
Aug6.6 mm (0.26 in)28 August 1954
Sep52.8 mm (2.1 in)23 September 1904
Oct108.0 mm (4.3 in)12 October 1962
Nov50.8 mm (2.0 in)5 November 1912
Dec127.0 mm (5.0 in)31 December 1915

Period of Record Coverage

1903 to 1915
Days with data per year at Napa 13 years of record at Napa, 1903 to 1915. 5 years have data for under 90 percent of days and are left out of rankings: 1903, 1904, 1911, 1913, 1915. 1903: 31 of 365 days1904: 329 of 366 days1905: 362 of 365 days1906: 332 of 365 days1907: 332 of 365 days1908: 365 of 366 days1909: 365 of 365 days1910: 365 of 365 days1911: 277 of 365 days1912: 366 of 366 days1913: 273 of 365 days1914: 364 of 365 days1915: 125 of 365 days190519101915
13 years of record at Napa, 1903 to 1915. 5 years have data for under 90 percent of days and are left out of rankings: 1903, 1904, 1911, 1913, 1915.
Days with data per year at Napa
YearDays with dataShare of yearComplete
1903318%No
190432990%No
190536299%Yes
190633291%Yes
190733291%Yes
1908365100%Yes
1909365100%Yes
1910365100%Yes
191127776%No
1912366100%Yes
191327375%No
1914364100%Yes
191512534%No

Latest Records

6
Latest records at Napa
DateStationRecordValueBeat old record byOld record stoodSignificance
12 December 1965Napa, USdaily rain19.3 mm (0.8 in)9.4 mm (0.37 in)59 years20 of 100 (Routine)
24 November 1965Napa, USdaily rain21.8 mm (0.9 in)5.3 mm (0.21 in)10 years13 of 100 (Routine)
13 November 1965Napa, USdaily rain14.7 mm (0.6 in)6.6 mm (0.26 in)12 years15 of 100 (Routine)
26 July 1965Napa, USdaily rain1.0 mm (0.04 in)0.5 mm (0.02 in)19 years11 of 100 (Routine)
16 April 1965Napa, USdaily rain10.7 mm (0.4 in)9.7 mm (0.38 in)16 years20 of 100 (Routine)
27 March 1965Napa, USdaily rain13.0 mm (0.5 in)0.3 mm (0.01 in)55 years20 of 100 (Routine)

Extremes by Year

1903 to 1965
Yearly extremes at Napa: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)43.9 C (111.0 F)190537.2 C (99.0 F)13
Coldest night (TNn)-5.0 C (23.0 F)1910-4.4 C (24.1 F)13
Wettest day (Rx1day)127.0 mm (5.0 in)191550.8 mm (2.0 in)34
Wettest five days (Rx5day)255.0 mm (10.0 in)196284.1 mm (3.3 in)34
Longest dry spell (CDD)183 days1909110 days34

Hottest day (TXx)

Hottest day (TXx) at Napa by year The hottest day of the year at Napa, 1903 to 1965. The record is 43.9 C (111.0 F) in 1905, marked on the chart; the median year is 37.2 C (99.0 F). 20304050192019401960Record: 43.9 C (111.0 F) in 1905
The hottest day of the year at Napa, 1903 to 1965. The record is 43.9 C (111.0 F) in 1905, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Napa by year
YearHottest day (TXx)
190321.7 C (71.1 F)
190443.3 C (109.9 F)
190543.9 C (111.0 F)
190640.0 C (104.0 F)
190735.6 C (96.1 F)
190837.2 C (99.0 F)
190940.6 C (105.1 F)
191039.4 C (102.9 F)
191134.4 C (93.9 F)
191240.0 C (104.0 F)
191336.7 C (98.1 F)
191437.2 C (99.0 F)
191536.1 C (97.0 F)
1945n/a
1946n/a
1947n/a
1948n/a
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963n/a
1964n/a
1965n/a

Coldest night (TNn)

Coldest night (TNn) at Napa by year The coldest night of the year at Napa, 1903 to 1965. The record is -5.0 C (23.0 F) in 1910, marked on the chart; the median year is -4.4 C (24.1 F). -5-4-3-2-1192019401960Record: -5.0 C (23.0 F) in 1910
The coldest night of the year at Napa, 1903 to 1965. The record is -5.0 C (23.0 F) in 1910, marked on the chart; the median year is -4.4 C (24.1 F).
Coldest night (TNn) at Napa by year
YearColdest night (TNn)
1903-1.7 C (28.9 F)
1904-2.2 C (28.0 F)
1905-4.4 C (24.1 F)
1906-2.8 C (27.0 F)
1907-3.3 C (26.1 F)
1908-4.4 C (24.1 F)
1909-3.9 C (25.0 F)
1910-5.0 C (23.0 F)
1911-4.4 C (24.1 F)
1912-4.4 C (24.1 F)
1913-4.4 C (24.1 F)
1914-3.3 C (26.1 F)
1915-5.0 C (23.0 F)
1945n/a
1946n/a
1947n/a
1948n/a
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963n/a
1964n/a
1965n/a

Wettest day (Rx1day)

Wettest day (Rx1day) at Napa by year The wettest day of the year at Napa, 1903 to 1965. The record is 127.0 mm (5.0 in) in 1915, marked on the chart; the median year is 50.8 mm (2.0 in). 050100150192019401960Record: 127.0 mm (5.0 in) in 1915
The wettest day of the year at Napa, 1903 to 1965. The record is 127.0 mm (5.0 in) in 1915, marked on the chart; the median year is 50.8 mm (2.0 in).
Wettest day (Rx1day) at Napa by year
YearWettest day (Rx1day)
190344.7 mm (1.8 in)
1904101.6 mm (4.0 in)
190535.1 mm (1.4 in)
190679.2 mm (3.1 in)
190758.7 mm (2.3 in)
190834.3 mm (1.4 in)
190962.5 mm (2.5 in)
191028.4 mm (1.1 in)
191172.4 mm (2.9 in)
191250.8 mm (2.0 in)
191348.3 mm (1.9 in)
191452.8 mm (2.1 in)
1915127.0 mm (5.0 in)
194530.0 mm (1.2 in)
194629.5 mm (1.2 in)
194750.8 mm (2.0 in)
194825.9 mm (1.0 in)
194935.6 mm (1.4 in)
195050.8 mm (2.0 in)
195161.0 mm (2.4 in)
195241.9 mm (1.6 in)
195346.2 mm (1.8 in)
195451.8 mm (2.0 in)
195592.7 mm (3.6 in)
195632.3 mm (1.3 in)
195731.5 mm (1.2 in)
195858.9 mm (2.3 in)
195952.3 mm (2.1 in)
196045.2 mm (1.8 in)
196143.4 mm (1.7 in)
1962108.0 mm (4.3 in)
196359.7 mm (2.4 in)
1964111.5 mm (4.4 in)
196532.8 mm (1.3 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Napa by year The wettest five days of the year at Napa, 1903 to 1965. The record is 255.0 mm (10.0 in) in 1962, marked on the chart; the median year is 84.1 mm (3.3 in). 0100200300192019401960Record: 255.0 mm (10.0 in) in 1962
The wettest five days of the year at Napa, 1903 to 1965. The record is 255.0 mm (10.0 in) in 1962, marked on the chart; the median year is 84.1 mm (3.3 in).
Wettest five days (Rx5day) at Napa by year
YearWettest five days (Rx5day)
190355.1 mm (2.2 in)
1904147.3 mm (5.8 in)
190558.9 mm (2.3 in)
1906202.8 mm (8.0 in)
1907127.3 mm (5.0 in)
190867.4 mm (2.7 in)
1909140.4 mm (5.5 in)
191075.2 mm (3.0 in)
191136.3 mm (1.4 in)
1912103.0 mm (4.1 in)
1913106.7 mm (4.2 in)
1914133.4 mm (5.3 in)
191580.7 mm (3.2 in)
194593.4 mm (3.7 in)
194668.9 mm (2.7 in)
194774.2 mm (2.9 in)
194849.2 mm (1.9 in)
194973.2 mm (2.9 in)
1950131.4 mm (5.2 in)
195173.6 mm (2.9 in)
195283.1 mm (3.3 in)
195370.0 mm (2.8 in)
195485.1 mm (3.4 in)
1955254.5 mm (10.0 in)
195656.1 mm (2.2 in)
195740.9 mm (1.6 in)
1958122.5 mm (4.8 in)
1959118.6 mm (4.7 in)
196085.9 mm (3.4 in)
196193.8 mm (3.7 in)
1962255.0 mm (10.0 in)
1963110.3 mm (4.3 in)
196482.3 mm (3.2 in)
196552.8 mm (2.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Napa by year The longest dry spell of the year at Napa, 1903 to 1965. The record is 183 days in 1909, marked on the chart; the median year is 110 days. 050100150200192019401960Record: 183 days in 1909
The longest dry spell of the year at Napa, 1903 to 1965. The record is 183 days in 1909, marked on the chart; the median year is 110 days.
Longest dry spell (CDD) at Napa by year
YearLongest dry spell (CDD)
190312 days
1904116 days
1905146 days
190650 days
1907125 days
1908112 days
1909183 days
1910156 days
1911118 days
191272 days
191336 days
1914106 days
191552 days
19459 days
194650 days
1947129 days
1948103 days
194973 days
1950153 days
1951139 days
195273 days
195383 days
195477 days
1955128 days
1956133 days
1957108 days
1958130 days
1959144 days
1960134 days
196192 days
1962153 days
1963124 days
196457 days
196595 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.

Download the Data

  • Data for Napa standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Napa 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

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