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Neptune 3 S Weather Records (USC00406454)

Record envelope, standing records and threshold days for Neptune 3 S (USC00406454), Tennessee, United States, with 36 years of record.

Key Facts for Neptune 3 S

  • Neptune 3 S (USC00406454) is a weather station in Tennessee, United States at 36.32 latitude and -87.22 longitude, 120 m (392 ft) above sea level.
  • The station reports from 1936 to 1971, 36 years of record.
  • 1,464 records set at Neptune 3 S still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Neptune 3 S set a daily record snowfall of 5.1 cm (2.0 in) on 26 March 1971.

About the Station

  • Location: Tennessee, United States, 36.32 latitude, -87.22 longitude.
  • Elevation: 120 m (392 ft).
  • Period of record: 1936 to 1971, 36 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Neptune 3 S, with 2026 drawn through them The band shows the record high and record low for each calendar day at Neptune 3 S. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Neptune 3 S. 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 Neptune 3 S, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan23.3 C (73.9 F)-31.7 C (-25.1 F)n/an/a
Feb27.8 C (82.0 F)-19.4 C (-2.9 F)n/an/a
Mar30.0 C (86.0 F)-16.7 C (1.9 F)n/an/a
Apr32.2 C (90.0 F)-8.3 C (17.1 F)n/an/a
May35.0 C (95.0 F)-0.6 C (30.9 F)n/an/a
Jun36.7 C (98.1 F)2.2 C (36.0 F)n/an/a
Jul38.9 C (102.0 F)7.8 C (46.0 F)n/an/a
Aug38.9 C (102.0 F)6.7 C (44.1 F)n/an/a
Sep39.4 C (102.9 F)0.6 C (33.1 F)n/an/a
Oct33.3 C (91.9 F)-5.6 C (21.9 F)n/an/a
Nov27.8 C (82.0 F)-14.4 C (6.1 F)n/an/a
Dec23.9 C (75.0 F)-23.3 C (-9.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Neptune 3 S by the year they were set 1,464 records at Neptune 3 S still stand. 1963 holds the most, with 116. 0501001501954: 551955: 871956: 1051957: 1001958: 691959: 741960: 871961: 871962: 771963: 1161964: 811965: 811966: 911967: 1001968: 721969: 641970: 871971: 31195419561958196019621964196619681970
1,464 records at Neptune 3 S still stand. 1963 holds the most, with 116.
Standing records at Neptune 3 S by the year they were set
Year setStanding records
195455
195587
1956105
1957100
195869
195974
196087
196187
196277
1963116
196481
196581
196691
1967100
196872
196964
197087
197131

All-Time Record Progression

1 new records
When Neptune 3 S set new all-time records 1 all-time records were set at Neptune 3 S between 23 March 1968 and 23 March 1968. Each dot is a new record. Record daily snowfall23 March 1968: Record daily snowfall 26.7 cm (10.5 in)
1 all-time records were set at Neptune 3 S between 23 March 1968 and 23 March 1968. Each dot is a new record.
When Neptune 3 S set new all-time records
DateKindDetail
1968-03-23Record daily snowfallRecord daily snowfall 26.7 cm (10.5 in)

Wettest Day of Each Month

Jan: 122.4 mm (4.8 in)
Record daily precipitation for each month at Neptune 3 S The wettest day on record for each calendar month at Neptune 3 S. The most was 122.4 mm (4.8 in) on 30 January 1956. 050100150 Jan: 122.4 mm (4.8 in), 30 January 1956 Jan Feb: 88.9 mm (3.5 in), 27 February 1962 Feb Mar: 78.7 mm (3.1 in), 22 March 1952 Mar Apr: 81.0 mm (3.2 in), 4 April 1957 Apr May: 72.4 mm (2.9 in), 2 May 1937 May Jun: 89.9 mm (3.5 in), 15 June 1969 Jun Jul: 115.6 mm (4.6 in), 4 July 1941 Jul Aug: 111.8 mm (4.4 in), 29 August 1963 Aug Sep: 97.0 mm (3.8 in), 8 September 1942 Sep Oct: 78.2 mm (3.1 in), 31 October 1942 Oct Nov: 122.4 mm (4.8 in), 19 November 1948 Nov Dec: 96.0 mm (3.8 in), 12 December 1949 Dec
The wettest day on record for each calendar month at Neptune 3 S. The most was 122.4 mm (4.8 in) on 30 January 1956.
Record daily precipitation for each month at Neptune 3 S
MonthRecord daily precipitation (mm)Date
Jan122.4 mm (4.8 in)30 January 1956
Feb88.9 mm (3.5 in)27 February 1962
Mar78.7 mm (3.1 in)22 March 1952
Apr81.0 mm (3.2 in)4 April 1957
May72.4 mm (2.9 in)2 May 1937
Jun89.9 mm (3.5 in)15 June 1969
Jul115.6 mm (4.6 in)4 July 1941
Aug111.8 mm (4.4 in)29 August 1963
Sep97.0 mm (3.8 in)8 September 1942
Oct78.2 mm (3.1 in)31 October 1942
Nov122.4 mm (4.8 in)19 November 1948
Dec96.0 mm (3.8 in)12 December 1949

Period of Record Coverage

1954 to 1971
Days with data per year at Neptune 3 S 18 years of record at Neptune 3 S, 1954 to 1971. 3 years have data for under 90 percent of days and are left out of rankings: 1954, 1955, 1971. 1954: 152 of 365 days1955: 321 of 365 days1956: 359 of 366 days1957: 360 of 365 days1958: 348 of 365 days1959: 352 of 365 days1960: 366 of 366 days1961: 350 of 365 days1962: 350 of 365 days1963: 356 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 365 of 365 days1967: 364 of 365 days1968: 366 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 120 of 365 days1955196019651970
18 years of record at Neptune 3 S, 1954 to 1971. 3 years have data for under 90 percent of days and are left out of rankings: 1954, 1955, 1971.
Days with data per year at Neptune 3 S
YearDays with dataShare of yearComplete
195415242%No
195532188%No
195635998%Yes
195736099%Yes
195834895%Yes
195935296%Yes
1960366100%Yes
196135096%Yes
196235096%Yes
196335698%Yes
1964366100%Yes
1965365100%Yes
1966365100%Yes
1967364100%Yes
1968366100%Yes
1969365100%Yes
1970365100%Yes
197112033%No

Latest Records

20
Latest records at Neptune 3 S
DateStationRecordValueBeat old record byOld record stoodSignificance
26 March 1971Neptune 3 S, USdaily snowfall5.1 cm (2.0 in)5.1 cm (2.0 in)34 years23 of 100 (Routine)
13 February 1971Neptune 3 S, USdaily snowfall11.4 cm (4.5 in)8.9 cm (3.5 in)11 years25 of 100 (Routine)
13 February 1971Neptune 3 S, USdaily snow depth12.7 cm (5.0 in)10.2 cm (4.0 in)11 years25 of 100 (Routine)
11 February 1971Neptune 3 S, USdaily snow depth (Tie)5.1 cm (2.0 in)tie16 years1 of 100 (Routine)
10 February 1971Neptune 3 S, USdaily snow depth7.6 cm (3.0 in)7.6 cm (3.0 in)35 years20 of 100 (Routine)
9 February 1971Neptune 3 S, USdaily snow depth10.2 cm (4.0 in)10.2 cm (4.0 in)35 years32 of 100 (Routine)
9 February 1971Neptune 3 S, USdaily snowfall2.5 cm (1.0 in)2.5 cm (1.0 in)35 years18 of 100 (Routine)
8 February 1971Neptune 3 S, USdaily snowfall7.6 cm (3.0 in)5.1 cm (2.0 in)8 years15 of 100 (Routine)
8 February 1971Neptune 3 S, USdaily snow depth7.6 cm (3.0 in)5.1 cm (2.0 in)8 years14 of 100 (Routine)
5 February 1971Neptune 3 S, USdaily rain18.3 mm (0.7 in)7.4 mm (0.29 in)28 years16 of 100 (Routine)
14 January 1971Neptune 3 S, USdaily rain48.5 mm (1.9 in)20.6 mm (0.8 in)31 years25 of 100 (Routine)
23 December 1970Neptune 3 S, USdaily rain37.3 mm (1.5 in)18.2 mm (0.7 in)28 years24 of 100 (Routine)
22 December 1970Neptune 3 S, USdaily rain50.8 mm (2.0 in)31.0 mm (1.2 in)3 years25 of 100 (Routine)
21 December 1970Neptune 3 S, USdaily rain46.7 mm (1.8 in)31.5 mm (1.2 in)19 years30 of 100 (Routine)
29 October 1970Neptune 3 S, USdaily rain24.1 mm (0.9 in)16.2 mm (0.6 in)15 years20 of 100 (Routine)
20 October 1970Neptune 3 S, USdaily rain24.1 mm (0.9 in)9.9 mm (0.39 in)32 years20 of 100 (Routine)
10 October 1970Neptune 3 S, USdaily rain24.6 mm (1.0 in)7.1 mm (0.28 in)28 years16 of 100 (Routine)
20 September 1970Neptune 3 S, USdaily rain28.2 mm (1.1 in)6.6 mm (0.26 in)27 years15 of 100 (Routine)
20 July 1970Neptune 3 S, USdaily rain30.7 mm (1.2 in)0.2 mm (0.01 in)32 years12 of 100 (Routine)
1 June 1970Neptune 3 S, USdaily rain18.0 mm (0.7 in)3.8 mm (0.15 in)31 years15 of 100 (Routine)

Climate Trend

13 complete years, 1956 to 1970
Annual mean temperature at Neptune 3 S as warming stripes, 1956 to 1970 One stripe for each of 13 complete years at Neptune 3 S, 1956 to 1970. Blue stripes are years cooler than the station's own mean of 13.2 C (55.8 F); red stripes are warmer. The coolest year was 1969, at 12.3 C (54.1 F), and the warmest was 1956, at 14.8 C (58.6 F). The strongest colour marks a difference of 1.6 C (2.9 F). 1956: 14.8 C, +1.6 C from the station mean1957: 14.6 C, +1.4 C from the station mean1958: 12.6 C, -0.6 C from the station mean1960: 12.7 C, -0.5 C from the station mean1962: 13.5 C, +0.3 C from the station mean1963: 12.5 C, -0.8 C from the station mean1964: 13.4 C, +0.2 C from the station mean1965: 13.7 C, +0.5 C from the station mean1966: 12.8 C, -0.4 C from the station mean1967: 13.3 C, +0.1 C from the station mean1968: 12.5 C, -0.7 C from the station mean1969: 12.3 C, -0.9 C from the station mean1970: 13.1 C, -0.1 C from the station mean19561958196019621964196619681970
One stripe for each of 13 complete years at Neptune 3 S, 1956 to 1970. Blue stripes are years cooler than the station's own mean of 13.2 C (55.8 F); red stripes are warmer. The coolest year was 1969, at 12.3 C (54.1 F), and the warmest was 1956, at 14.8 C (58.6 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Neptune 3 S as warming stripes, 1956 to 1970
YearAnnual mean temperatureDifference from the station mean
195614.8 C+1.56 C
195714.6 C+1.36 C
195812.6 C-0.60 C
196012.7 C-0.49 C
196213.5 C+0.32 C
196312.5 C-0.75 C
196413.4 C+0.17 C
196513.7 C+0.50 C
196612.8 C-0.41 C
196713.3 C+0.11 C
196812.5 C-0.72 C
196912.3 C-0.93 C
197013.1 C-0.08 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

1936 to 1971
Yearly extremes at Neptune 3 S: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)39.4 C (102.9 F)195437.2 C (99.0 F)18
Coldest night (TNn)-31.7 C (-25.1 F)1963-18.0 C (-0.5 F)18
Wettest day (Rx1day)122.4 mm (4.8 in)194872.9 mm (2.9 in)36
Wettest five days (Rx5day)241.3 mm (9.5 in)1937112.3 mm (4.4 in)36
Longest dry spell (CDD)36 days195319 days36

Hottest day (TXx)

Hottest day (TXx) at Neptune 3 S by year The hottest day of the year at Neptune 3 S, 1936 to 1971. The record is 39.4 C (102.9 F) in 1954, marked on the chart; the median year is 37.2 C (99.0 F). 3032343638401940195019601970Record: 39.4 C (102.9 F) in 1954
The hottest day of the year at Neptune 3 S, 1936 to 1971. The record is 39.4 C (102.9 F) in 1954, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Neptune 3 S by year
YearHottest day (TXx)
1936n/a
1937n/a
1938n/a
1939n/a
1940n/a
1941n/a
1942n/a
1943n/a
1944n/a
1945n/a
1946n/a
1947n/a
1948n/a
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
195439.4 C (102.9 F)
195536.7 C (98.1 F)
195638.9 C (102.0 F)
195738.9 C (102.0 F)
195834.4 C (93.9 F)
195935.6 C (96.1 F)
196037.8 C (100.0 F)
196135.0 C (95.0 F)
196237.2 C (99.0 F)
196337.8 C (100.0 F)
196437.2 C (99.0 F)
196536.7 C (98.1 F)
196638.9 C (102.0 F)
196735.0 C (95.0 F)
196837.2 C (99.0 F)
196937.8 C (100.0 F)
197036.1 C (97.0 F)
197131.7 C (89.1 F)

Coldest night (TNn)

Coldest night (TNn) at Neptune 3 S by year The coldest night of the year at Neptune 3 S, 1936 to 1971. The record is -31.7 C (-25.1 F) in 1963, marked on the chart; the median year is -18.0 C (-0.5 F). -40-30-20-1001940195019601970Record: -31.7 C (-25.1 F) in 1963
The coldest night of the year at Neptune 3 S, 1936 to 1971. The record is -31.7 C (-25.1 F) in 1963, marked on the chart; the median year is -18.0 C (-0.5 F).
Coldest night (TNn) at Neptune 3 S by year
YearColdest night (TNn)
1936n/a
1937n/a
1938n/a
1939n/a
1940n/a
1941n/a
1942n/a
1943n/a
1944n/a
1945n/a
1946n/a
1947n/a
1948n/a
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954-9.4 C (15.1 F)
1955-19.4 C (-2.9 F)
1956-11.7 C (10.9 F)
1957-15.0 C (5.0 F)
1958-16.7 C (1.9 F)
1959-17.8 C (0.0 F)
1960-18.3 C (-0.9 F)
1961-20.0 C (-4.0 F)
1962-23.3 C (-9.9 F)
1963-31.7 C (-25.1 F)
1964-16.7 C (1.9 F)
1965-18.9 C (-2.0 F)
1966-25.0 C (-13.0 F)
1967-15.0 C (5.0 F)
1968-17.2 C (1.0 F)
1969-16.7 C (1.9 F)
1970-23.9 C (-11.0 F)
1971-18.9 C (-2.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Neptune 3 S by year The wettest day of the year at Neptune 3 S, 1936 to 1971. The record is 122.4 mm (4.8 in) in 1948, marked on the chart; the median year is 72.9 mm (2.9 in). 4060801001201401940195019601970Record: 122.4 mm (4.8 in) in 1948
The wettest day of the year at Neptune 3 S, 1936 to 1971. The record is 122.4 mm (4.8 in) in 1948, marked on the chart; the median year is 72.9 mm (2.9 in).
Wettest day (Rx1day) at Neptune 3 S by year
YearWettest day (Rx1day)
193652.1 mm (2.1 in)
193790.4 mm (3.6 in)
193897.0 mm (3.8 in)
193952.8 mm (2.1 in)
194053.1 mm (2.1 in)
1941115.6 mm (4.6 in)
194297.0 mm (3.8 in)
194355.4 mm (2.2 in)
194479.5 mm (3.1 in)
194570.1 mm (2.8 in)
194661.5 mm (2.4 in)
194769.3 mm (2.7 in)
1948122.4 mm (4.8 in)
194996.0 mm (3.8 in)
195064.5 mm (2.5 in)
195177.5 mm (3.1 in)
195278.7 mm (3.1 in)
195352.8 mm (2.1 in)
195461.0 mm (2.4 in)
195571.9 mm (2.8 in)
1956122.4 mm (4.8 in)
195781.0 mm (3.2 in)
195861.2 mm (2.4 in)
195966.3 mm (2.6 in)
196047.0 mm (1.9 in)
196149.0 mm (1.9 in)
196290.2 mm (3.6 in)
1963111.8 mm (4.4 in)
196474.7 mm (2.9 in)
196556.9 mm (2.2 in)
196655.1 mm (2.2 in)
196776.2 mm (3.0 in)
1968103.4 mm (4.1 in)
196989.9 mm (3.5 in)
197073.9 mm (2.9 in)
197148.5 mm (1.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Neptune 3 S by year The wettest five days of the year at Neptune 3 S, 1936 to 1971. The record is 241.3 mm (9.5 in) in 1937, marked on the chart; the median year is 112.3 mm (4.4 in). 501001502002501940195019601970Record: 241.3 mm (9.5 in) in 1937
The wettest five days of the year at Neptune 3 S, 1936 to 1971. The record is 241.3 mm (9.5 in) in 1937, marked on the chart; the median year is 112.3 mm (4.4 in).
Wettest five days (Rx5day) at Neptune 3 S by year
YearWettest five days (Rx5day)
193692.7 mm (3.6 in)
1937241.3 mm (9.5 in)
1938136.9 mm (5.4 in)
193997.0 mm (3.8 in)
194078.0 mm (3.1 in)
1941124.5 mm (4.9 in)
1942112.5 mm (4.4 in)
194388.6 mm (3.5 in)
1944112.3 mm (4.4 in)
1945124.2 mm (4.9 in)
194683.3 mm (3.3 in)
1947102.1 mm (4.0 in)
1948131.6 mm (5.2 in)
1949187.4 mm (7.4 in)
1950123.7 mm (4.9 in)
1951137.0 mm (5.4 in)
1952124.4 mm (4.9 in)
195399.3 mm (3.9 in)
195476.8 mm (3.0 in)
1955131.6 mm (5.2 in)
1956205.7 mm (8.1 in)
1957134.1 mm (5.3 in)
195878.3 mm (3.1 in)
1959109.0 mm (4.3 in)
1960102.1 mm (4.0 in)
196189.1 mm (3.5 in)
1962157.2 mm (6.2 in)
1963112.3 mm (4.4 in)
1964107.2 mm (4.2 in)
196594.2 mm (3.7 in)
1966107.7 mm (4.2 in)
1967110.5 mm (4.4 in)
1968133.7 mm (5.3 in)
1969135.4 mm (5.3 in)
1970136.6 mm (5.4 in)
197153.3 mm (2.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Neptune 3 S by year The longest dry spell of the year at Neptune 3 S, 1936 to 1971. The record is 36 days in 1953, marked on the chart; the median year is 19 days. 0102030401940195019601970Record: 36 days in 1953
The longest dry spell of the year at Neptune 3 S, 1936 to 1971. The record is 36 days in 1953, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Neptune 3 S by year
YearLongest dry spell (CDD)
193624 days
193714 days
193834 days
193924 days
194023 days
194135 days
194215 days
194322 days
194426 days
194516 days
194618 days
194719 days
194819 days
194917 days
195019 days
195117 days
195229 days
195336 days
195419 days
195522 days
195618 days
195721 days
195821 days
195916 days
196017 days
196116 days
196221 days
196331 days
196419 days
196515 days
196615 days
196720 days
196817 days
196916 days
197017 days
19718 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

35 years, 1936 to 1970

A day with at least 72.8 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 147.2 mm (5.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Neptune 3 S: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years72.8 mm (2.9 in)
5 years92.9 mm (3.7 in)
10 years106.1 mm (4.2 in)
25 years122.8 mm (4.8 in)
50 years135.1 mm (5.3 in)Longer than the 35 years of record
100 years147.2 mm (5.8 in)Longer than the 35 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, 35 years of values from 1936 to 1970.

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: 122.4 mm (4.8 in) in 1948; 122.4 mm (4.8 in) in 1956; 115.6 mm (4.6 in) in 1941.

Download the Data

  • Data for Neptune 3 S standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Neptune 3 S 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

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