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
Record highRecord low2026 daily maximum2026 daily minimum
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
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
23.3 C (73.9 F)
-5.0 C (23.0 F)
n/a
n/a
Feb
25.6 C (78.1 F)
-3.9 C (25.0 F)
n/a
n/a
Mar
32.8 C (91.0 F)
-2.8 C (27.0 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-2.2 C (28.0 F)
n/a
n/a
May
39.4 C (102.9 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
40.6 C (105.1 F)
3.3 C (37.9 F)
n/a
n/a
Jul
43.9 C (111.0 F)
3.9 C (39.0 F)
n/a
n/a
Aug
39.4 C (102.9 F)
3.9 C (39.0 F)
n/a
n/a
Sep
43.3 C (109.9 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
36.1 C (97.0 F)
-1.7 C (28.9 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-4.4 C (24.1 F)
n/a
n/a
Dec
24.4 C (75.9 F)
-5.0 C (23.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Napa still stand. 1909 holds the most, with 165.
Standing records at Napa by the year they were set
Year set
Standing records
1903
11
1904
129
1905
133
1906
127
1907
126
1908
136
1909
165
1910
127
1911
86
1912
110
1913
116
1914
152
1915
46
Wettest Day of Each Month
Dec: 127.0 mm (5.0 in)
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
Month
Record daily precipitation (mm)
Date
Jan
79.2 mm (3.1 in)
12 January 1906
Feb
101.6 mm (4.0 in)
12 February 1904
Mar
70.6 mm (2.8 in)
10 March 1904
Apr
58.9 mm (2.3 in)
3 April 1958
May
44.7 mm (1.8 in)
26 May 1906
Jun
24.6 mm (1.0 in)
1 June 1948
Jul
2.5 mm (0.10 in)
28 July 1964
Aug
6.6 mm (0.26 in)
28 August 1954
Sep
52.8 mm (2.1 in)
23 September 1904
Oct
108.0 mm (4.3 in)
12 October 1962
Nov
50.8 mm (2.0 in)
5 November 1912
Dec
127.0 mm (5.0 in)
31 December 1915
Period of Record Coverage
1903 to 1915
Complete yearUnder 90 percent of days
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.
Yearly extremes at Napa: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.9 C (111.0 F)
1905
37.2 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)
1915
50.8 mm (2.0 in)
34
Wettest five days (Rx5day)
255.0 mm (10.0 in)
1962
84.1 mm (3.3 in)
34
Longest dry spell (CDD)
183 days
1909
110 days
34
Hottest day (TXx)
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
Year
Hottest day (TXx)
1903
21.7 C (71.1 F)
1904
43.3 C (109.9 F)
1905
43.9 C (111.0 F)
1906
40.0 C (104.0 F)
1907
35.6 C (96.1 F)
1908
37.2 C (99.0 F)
1909
40.6 C (105.1 F)
1910
39.4 C (102.9 F)
1911
34.4 C (93.9 F)
1912
40.0 C (104.0 F)
1913
36.7 C (98.1 F)
1914
37.2 C (99.0 F)
1915
36.1 C (97.0 F)
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
n/a
1964
n/a
1965
n/a
Coldest night (TNn)
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
Year
Coldest 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)
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
n/a
1964
n/a
1965
n/a
Wettest day (Rx1day)
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
Year
Wettest day (Rx1day)
1903
44.7 mm (1.8 in)
1904
101.6 mm (4.0 in)
1905
35.1 mm (1.4 in)
1906
79.2 mm (3.1 in)
1907
58.7 mm (2.3 in)
1908
34.3 mm (1.4 in)
1909
62.5 mm (2.5 in)
1910
28.4 mm (1.1 in)
1911
72.4 mm (2.9 in)
1912
50.8 mm (2.0 in)
1913
48.3 mm (1.9 in)
1914
52.8 mm (2.1 in)
1915
127.0 mm (5.0 in)
1945
30.0 mm (1.2 in)
1946
29.5 mm (1.2 in)
1947
50.8 mm (2.0 in)
1948
25.9 mm (1.0 in)
1949
35.6 mm (1.4 in)
1950
50.8 mm (2.0 in)
1951
61.0 mm (2.4 in)
1952
41.9 mm (1.6 in)
1953
46.2 mm (1.8 in)
1954
51.8 mm (2.0 in)
1955
92.7 mm (3.6 in)
1956
32.3 mm (1.3 in)
1957
31.5 mm (1.2 in)
1958
58.9 mm (2.3 in)
1959
52.3 mm (2.1 in)
1960
45.2 mm (1.8 in)
1961
43.4 mm (1.7 in)
1962
108.0 mm (4.3 in)
1963
59.7 mm (2.4 in)
1964
111.5 mm (4.4 in)
1965
32.8 mm (1.3 in)
Wettest five days (Rx5day)
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
Year
Wettest five days (Rx5day)
1903
55.1 mm (2.2 in)
1904
147.3 mm (5.8 in)
1905
58.9 mm (2.3 in)
1906
202.8 mm (8.0 in)
1907
127.3 mm (5.0 in)
1908
67.4 mm (2.7 in)
1909
140.4 mm (5.5 in)
1910
75.2 mm (3.0 in)
1911
36.3 mm (1.4 in)
1912
103.0 mm (4.1 in)
1913
106.7 mm (4.2 in)
1914
133.4 mm (5.3 in)
1915
80.7 mm (3.2 in)
1945
93.4 mm (3.7 in)
1946
68.9 mm (2.7 in)
1947
74.2 mm (2.9 in)
1948
49.2 mm (1.9 in)
1949
73.2 mm (2.9 in)
1950
131.4 mm (5.2 in)
1951
73.6 mm (2.9 in)
1952
83.1 mm (3.3 in)
1953
70.0 mm (2.8 in)
1954
85.1 mm (3.4 in)
1955
254.5 mm (10.0 in)
1956
56.1 mm (2.2 in)
1957
40.9 mm (1.6 in)
1958
122.5 mm (4.8 in)
1959
118.6 mm (4.7 in)
1960
85.9 mm (3.4 in)
1961
93.8 mm (3.7 in)
1962
255.0 mm (10.0 in)
1963
110.3 mm (4.3 in)
1964
82.3 mm (3.2 in)
1965
52.8 mm (2.1 in)
Longest dry spell (CDD)
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
Year
Longest dry spell (CDD)
1903
12 days
1904
116 days
1905
146 days
1906
50 days
1907
125 days
1908
112 days
1909
183 days
1910
156 days
1911
118 days
1912
72 days
1913
36 days
1914
106 days
1915
52 days
1945
9 days
1946
50 days
1947
129 days
1948
103 days
1949
73 days
1950
153 days
1951
139 days
1952
73 days
1953
83 days
1954
77 days
1955
128 days
1956
133 days
1957
108 days
1958
130 days
1959
144 days
1960
134 days
1961
92 days
1962
153 days
1963
124 days
1964
57 days
1965
95 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.