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Bethlehem Lehigh UNIV Weather Records (USC00360634)

Record envelope, standing records and threshold days for Bethlehem Lehigh UNIV (USC00360634), Pennsylvania, United States, with 71 years of record.

Key Facts for Bethlehem Lehigh UNIV

  • Bethlehem Lehigh UNIV (USC00360634) is a weather station in Pennsylvania, United States at 40.60 latitude and -75.37 longitude, 110 m (361 ft) above sea level.
  • The station reports from 1894 to 1964, 71 years of record.
  • 1,464 records set at Bethlehem Lehigh UNIV still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Bethlehem Lehigh UNIV tied a monthly record high maximum temperature of 40.0 C (104.0 F) on 30 June 1964.

About the Station

  • Location: Pennsylvania, United States, 40.60 latitude, -75.37 longitude.
  • Elevation: 110 m (361 ft).
  • Period of record: 1894 to 1964, 71 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 Bethlehem Lehigh UNIV, with 2026 drawn through them The band shows the record high and record low for each calendar day at Bethlehem Lehigh UNIV. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Bethlehem Lehigh UNIV. 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 Bethlehem Lehigh UNIV, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan22.2 C (72.0 F)-26.7 C (-16.1 F)n/an/a
Feb23.9 C (75.0 F)-25.0 C (-13.0 F)n/an/a
Mar30.0 C (86.0 F)-17.8 C (0.0 F)n/an/a
Apr34.4 C (93.9 F)-6.7 C (19.9 F)n/an/a
May37.8 C (100.0 F)0.0 C (32.0 F)n/an/a
Jun40.0 C (104.0 F)4.4 C (39.9 F)n/an/a
Jul40.0 C (104.0 F)7.8 C (46.0 F)n/an/a
Aug40.6 C (105.1 F)6.1 C (43.0 F)n/an/a
Sep38.3 C (100.9 F)-0.6 C (30.9 F)n/an/a
Oct34.4 C (93.9 F)-7.2 C (19.0 F)n/an/a
Nov27.2 C (81.0 F)-12.2 C (10.0 F)n/an/a
Dec20.6 C (69.1 F)-22.8 C (-9.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Bethlehem Lehigh UNIV by the year they were set 1,464 records at Bethlehem Lehigh UNIV still stand. 1961 holds the most, with 46. 02040601894: 21910: 241911: 451912: 281913: 371914: 281915: 231916: 321917: 301918: 331919: 301920: 291921: 421922: 201923: 241924: 191925: 251926: 351927: 261928: 151929: 361930: 331931: 281932: 321933: 281934: 391935: 161936: 351937: 191938: 361939: 131940: 401941: 201942: 231943: 221944: 111945: 251946: 191947: 171948: 261949: 271950: 281951: 271952: 161953: 91954: 231955: 241956: 241957: 181958: 261959: 291960: 251961: 461962: 251963: 371964: 151894191519211927193319391945195119571963
1,464 records at Bethlehem Lehigh UNIV still stand. 1961 holds the most, with 46.
Standing records at Bethlehem Lehigh UNIV by the year they were set
Year setStanding records
18942
191024
191145
191228
191337
191428
191523
191632
191730
191833
191930
192029
192142
192220
192324
192419
192525
192635
192726
192815
192936
193033
193128
193232
193328
193439
193516
193635
193719
193836
193913
194040
194120
194223
194322
194411
194525
194619
194717
194826
194927
195028
195127
195216
19539
195423
195524
195624
195718
195826
195929
196025
196146
196225
196337
196415

All-Time Record Progression

1 new records
When Bethlehem Lehigh UNIV set new all-time records 1 all-time records were set at Bethlehem Lehigh UNIV between 9 July 1935 and 9 July 1935. Each dot is a new record. Record daily precipitation9 July 1935: Record daily precipitation 129.5 mm (5.1 in)1935
1 all-time records were set at Bethlehem Lehigh UNIV between 9 July 1935 and 9 July 1935. Each dot is a new record.
When Bethlehem Lehigh UNIV set new all-time records
DateKindDetail
1935-07-09Record daily precipitationRecord daily precipitation 129.5 mm (5.1 in)

Wettest Day of Each Month

Jul: 129.5 mm (5.1 in)
Record daily precipitation for each month at Bethlehem Lehigh UNIV The wettest day on record for each calendar month at Bethlehem Lehigh UNIV. The most was 129.5 mm (5.1 in) on 9 July 1935. 050100150 Jan: 71.1 mm (2.8 in), 2 January 1925 Jan Feb: 82.3 mm (3.2 in), 6 February 1896 Feb Mar: 60.7 mm (2.4 in), 27 March 1913 Mar Apr: 56.9 mm (2.2 in), 9 April 1895 Apr May: 87.6 mm (3.4 in), 28 May 1896 May Jun: 99.8 mm (3.9 in), 18 June 1938 Jun Jul: 129.5 mm (5.1 in), 9 July 1935 Jul Aug: 100.3 mm (3.9 in), 31 August 1960 Aug Sep: 118.6 mm (4.7 in), 8 September 1894 Sep Oct: 82.3 mm (3.2 in), 6 October 1932 Oct Nov: 87.1 mm (3.4 in), 25 November 1950 Nov Dec: 62.2 mm (2.4 in), 30 December 1901 Dec
The wettest day on record for each calendar month at Bethlehem Lehigh UNIV. The most was 129.5 mm (5.1 in) on 9 July 1935.
Record daily precipitation for each month at Bethlehem Lehigh UNIV
MonthRecord daily precipitation (mm)Date
Jan71.1 mm (2.8 in)2 January 1925
Feb82.3 mm (3.2 in)6 February 1896
Mar60.7 mm (2.4 in)27 March 1913
Apr56.9 mm (2.2 in)9 April 1895
May87.6 mm (3.4 in)28 May 1896
Jun99.8 mm (3.9 in)18 June 1938
Jul129.5 mm (5.1 in)9 July 1935
Aug100.3 mm (3.9 in)31 August 1960
Sep118.6 mm (4.7 in)8 September 1894
Oct82.3 mm (3.2 in)6 October 1932
Nov87.1 mm (3.4 in)25 November 1950
Dec62.2 mm (2.4 in)30 December 1901

Period of Record Coverage

1894 to 1964
Days with data per year at Bethlehem Lehigh UNIV 56 years of record at Bethlehem Lehigh UNIV, 1894 to 1964. 14 years have data for under 90 percent of days and are left out of rankings: 1894, 1914, 1922, 1923, 1942, 1943, 1944, 1945 and others. 1894: 40 of 365 days1910: 332 of 365 days1911: 343 of 365 days1912: 360 of 366 days1913: 362 of 365 days1914: 327 of 365 days1915: 362 of 365 days1916: 362 of 366 days1917: 364 of 365 days1918: 362 of 365 days1919: 364 of 365 days1920: 366 of 366 days1921: 363 of 365 days1922: 149 of 365 days1923: 239 of 365 days1924: 355 of 366 days1925: 360 of 365 days1926: 362 of 365 days1927: 360 of 365 days1928: 351 of 366 days1929: 365 of 365 days1930: 362 of 365 days1931: 365 of 365 days1932: 365 of 366 days1933: 365 of 365 days1934: 362 of 365 days1935: 364 of 365 days1936: 365 of 366 days1937: 362 of 365 days1938: 364 of 365 days1939: 363 of 365 days1940: 366 of 366 days1941: 365 of 365 days1942: 293 of 365 days1943: 289 of 365 days1944: 292 of 366 days1945: 286 of 365 days1946: 288 of 365 days1947: 291 of 365 days1948: 323 of 366 days1949: 365 of 365 days1950: 363 of 365 days1951: 364 of 365 days1952: 366 of 366 days1953: 273 of 365 days1954: 352 of 365 days1955: 334 of 365 days1956: 363 of 366 days1957: 275 of 365 days1958: 363 of 365 days1959: 357 of 365 days1960: 358 of 366 days1961: 360 of 365 days1962: 358 of 365 days1963: 339 of 365 days1964: 142 of 366 days191019201930194019501960
56 years of record at Bethlehem Lehigh UNIV, 1894 to 1964. 14 years have data for under 90 percent of days and are left out of rankings: 1894, 1914, 1922, 1923, 1942, 1943, 1944, 1945 and others.
Days with data per year at Bethlehem Lehigh UNIV
YearDays with dataShare of yearComplete
18944011%No
191033291%Yes
191134394%Yes
191236098%Yes
191336299%Yes
191432790%No
191536299%Yes
191636299%Yes
1917364100%Yes
191836299%Yes
1919364100%Yes
1920366100%Yes
192136399%Yes
192214941%No
192323965%No
192435597%Yes
192536099%Yes
192636299%Yes
192736099%Yes
192835196%Yes
1929365100%Yes
193036299%Yes
1931365100%Yes
1932365100%Yes
1933365100%Yes
193436299%Yes
1935364100%Yes
1936365100%Yes
193736299%Yes
1938364100%Yes
193936399%Yes
1940366100%Yes
1941365100%Yes
194229380%No
194328979%No
194429280%No
194528678%No
194628879%No
194729180%No
194832388%No
1949365100%Yes
195036399%Yes
1951364100%Yes
1952366100%Yes
195327375%No
195435296%Yes
195533492%Yes
195636399%Yes
195727575%No
195836399%Yes
195935798%Yes
196035898%Yes
196136099%Yes
196235898%Yes
196333993%Yes
196414239%No

Latest Records

20
Latest records at Bethlehem Lehigh UNIV
DateStationRecordValueBeat old record byOld record stoodSignificance
30 June 1964Bethlehem Lehigh UNIV, USmonthly high max (Tie)40.0 C (104.0 F)tie1 year4 of 100 (Routine)
24 June 1964Bethlehem Lehigh UNIV, USdaily high min23.3 C (73.9 F)1.1 C (2.0 F)4 years10 of 100 (Routine)
17 June 1964Bethlehem Lehigh UNIV, USdaily low min (Tie)8.3 C (46.9 F)tie47 years5 of 100 (Routine)
14 June 1964Bethlehem Lehigh UNIV, USdaily high min23.3 C (73.9 F)1.1 C (2.0 F)8 years11 of 100 (Routine)
14 June 1964Bethlehem Lehigh UNIV, USdaily high max35.6 C (96.1 F)0.6 C (1.1 F)8 years10 of 100 (Routine)
25 May 1964Bethlehem Lehigh UNIV, USdaily high min21.1 C (70.0 F)2.2 C (4.0 F)28 years20 of 100 (Routine)
24 May 1964Bethlehem Lehigh UNIV, USdaily high min20.6 C (69.1 F)2.8 C (5.0 F)54 years29 of 100 (Routine)
24 May 1964Bethlehem Lehigh UNIV, USdaily high max35.6 C (96.1 F)3.4 C (6.1 F)39 years24 of 100 (Routine)
23 May 1964Bethlehem Lehigh UNIV, USmonthly high max37.8 C (100.0 F)1.7 C (3.1 F)23 years26 of 100 (Routine)
23 May 1964Bethlehem Lehigh UNIV, USdaily high min21.7 C (71.1 F)0.6 C (1.1 F)53 years23 of 100 (Routine)
19 May 1964Bethlehem Lehigh UNIV, USmonthly high max (Tie)36.1 C (97.0 F)tie22 years5 of 100 (Routine)
9 May 1964Bethlehem Lehigh UNIV, USdaily high min (Tie)20.6 C (69.1 F)tie28 years3 of 100 (Routine)
8 May 1964Bethlehem Lehigh UNIV, USdaily high min21.1 C (70.0 F)1.7 C (3.1 F)34 years21 of 100 (Routine)
30 April 1964Bethlehem Lehigh UNIV, USdaily low max8.3 C (46.9 F)0.6 C (1.1 F)52 years22 of 100 (Routine)
21 April 1964Bethlehem Lehigh UNIV, USdaily low max (Tie)6.7 C (44.1 F)tie24 years3 of 100 (Routine)
18 April 1964Bethlehem Lehigh UNIV, USdaily high min20.0 C (68.0 F)5.6 C (10.1 F)46 years32 of 100 (Routine)
18 April 1964Bethlehem Lehigh UNIV, USdaily high max30.0 C (86.0 F)0.6 C (1.1 F)1 year7 of 100 (Routine)
17 April 1964Bethlehem Lehigh UNIV, USdaily high max30.0 C (86.0 F)2.2 C (4.0 F)4 years11 of 100 (Routine)
14 April 1964Bethlehem Lehigh UNIV, USdaily high min (Tie)13.3 C (55.9 F)tie23 years3 of 100 (Routine)
21 January 1964Bethlehem Lehigh UNIV, USdaily high min (Tie)3.9 C (39.0 F)tie37 years4 of 100 (Routine)

Climate Trend

42 complete years, 1912 to 1962
Annual mean temperature at Bethlehem Lehigh UNIV as warming stripes, 1912 to 1962 One stripe for each of 42 complete years at Bethlehem Lehigh UNIV, 1912 to 1962. Blue stripes are years cooler than the station's own mean of 11.7 C (53.1 F); red stripes are warmer. The coolest year was 1958, at 10.3 C (50.6 F), and the warmest was 1913, at 13.1 C (55.7 F). The strongest colour marks a difference of 1.5 C (2.7 F). 1912: 11.0 C, -0.7 C from the station mean1913: 13.1 C, +1.4 C from the station mean1916: 11.2 C, -0.6 C from the station mean1917: 10.4 C, -1.3 C from the station mean1918: 11.6 C, -0.1 C from the station mean1919: 12.5 C, +0.8 C from the station mean1920: 11.1 C, -0.6 C from the station mean1921: 12.3 C, +0.5 C from the station mean1924: 10.8 C, -0.9 C from the station mean1925: 11.7 C, 0.0 C from the station mean1927: 11.6 C, -0.2 C from the station mean1928: 11.8 C, +0.1 C from the station mean1929: 12.0 C, +0.2 C from the station mean1930: 12.2 C, +0.5 C from the station mean1931: 13.1 C, +1.4 C from the station mean1932: 12.5 C, +0.7 C from the station mean1933: 12.2 C, +0.4 C from the station mean1934: 11.5 C, -0.2 C from the station mean1935: 11.4 C, -0.3 C from the station mean1936: 11.8 C, +0.1 C from the station mean1937: 12.2 C, +0.5 C from the station mean1938: 12.5 C, +0.8 C from the station mean1939: 12.6 C, +0.8 C from the station mean1940: 10.7 C, -1.1 C from the station mean1941: 12.3 C, +0.6 C from the station mean1942: 11.6 C, -0.1 C from the station mean1943: 11.2 C, -0.5 C from the station mean1944: 11.4 C, -0.3 C from the station mean1945: 11.3 C, -0.4 C from the station mean1946: 12.5 C, +0.7 C from the station mean1947: 11.6 C, -0.2 C from the station mean1949: 12.8 C, +1.1 C from the station mean1950: 11.3 C, -0.5 C from the station mean1951: 11.6 C, -0.2 C from the station mean1952: 11.9 C, +0.1 C from the station mean1954: 12.2 C, +0.4 C from the station mean1956: 11.0 C, -0.8 C from the station mean1958: 10.3 C, -1.4 C from the station mean1959: 11.8 C, 0.0 C from the station mean1960: 12.2 C, +0.5 C from the station mean1961: 12.0 C, +0.2 C from the station mean1962: 10.4 C, -1.4 C from the station mean19121915192019251930193519401945195019551960
One stripe for each of 42 complete years at Bethlehem Lehigh UNIV, 1912 to 1962. Blue stripes are years cooler than the station's own mean of 11.7 C (53.1 F); red stripes are warmer. The coolest year was 1958, at 10.3 C (50.6 F), and the warmest was 1913, at 13.1 C (55.7 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Bethlehem Lehigh UNIV as warming stripes, 1912 to 1962
YearAnnual mean temperatureDifference from the station mean
191211.0 C-0.73 C
191313.1 C+1.40 C
191611.2 C-0.59 C
191710.4 C-1.34 C
191811.6 C-0.10 C
191912.5 C+0.79 C
192011.1 C-0.62 C
192112.3 C+0.51 C
192410.8 C-0.90 C
192511.7 C-0.03 C
192711.6 C-0.17 C
192811.8 C+0.09 C
192912.0 C+0.23 C
193012.2 C+0.50 C
193113.1 C+1.36 C
193212.5 C+0.72 C
193312.2 C+0.45 C
193411.5 C-0.23 C
193511.4 C-0.30 C
193611.8 C+0.07 C
193712.2 C+0.49 C
193812.5 C+0.76 C
193912.6 C+0.83 C
194010.7 C-1.08 C
194112.3 C+0.60 C
194211.6 C-0.10 C
194311.2 C-0.52 C
194411.4 C-0.31 C
194511.3 C-0.40 C
194612.5 C+0.72 C
194711.6 C-0.17 C
194912.8 C+1.07 C
195011.3 C-0.48 C
195111.6 C-0.15 C
195211.9 C+0.14 C
195412.2 C+0.43 C
195611.0 C-0.79 C
195810.3 C-1.42 C
195911.8 C+0.02 C
196012.2 C+0.50 C
196112.0 C+0.21 C
196210.4 C-1.36 C

The fitted trend in annual mean temperature here over 1912 to 1962 is -0.05 C (-0.21 to 0.11) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.2) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Bethlehem Lehigh UNIV
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.05 C (-0.21 to 0.11) per decade-0.1 F (-0.4 to 0.2) per decade1912 to 196242Not clearly different from zero
Mean daily maximum-0.4 C (-0.6 to -0.2) per decade-0.7 F (-1.0 to -0.4) per decade1912 to 196242Fall
Mean daily minimum0.3 C (0.1 to 0.5) per decade0.5 F (0.2 to 0.8) per decade1912 to 196242Rise

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

1894 to 1964
Yearly extremes at Bethlehem Lehigh UNIV: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)40.6 C (105.1 F)191836.7 C (98.1 F)56
Coldest night (TNn)-26.7 C (-16.1 F)1912-16.9 C (1.5 F)56
Wettest day (Rx1day)129.5 mm (5.1 in)193564.3 mm (2.5 in)64
Wettest five days (Rx5day)195.8 mm (7.7 in)191991.0 mm (3.6 in)64
Longest dry spell (CDD)44 days192418 days64

Hottest day (TXx)

Hottest day (TXx) at Bethlehem Lehigh UNIV by year The hottest day of the year at Bethlehem Lehigh UNIV, 1894 to 1964. The record is 40.6 C (105.1 F) in 1918, marked on the chart; the median year is 36.7 C (98.1 F). 10203040501900192019401960Record: 40.6 C (105.1 F) in 1918
The hottest day of the year at Bethlehem Lehigh UNIV, 1894 to 1964. The record is 40.6 C (105.1 F) in 1918, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Bethlehem Lehigh UNIV by year
YearHottest day (TXx)
189414.4 C (57.9 F)
1895n/a
1896n/a
1897n/a
1898n/a
1899n/a
1900n/a
1901n/a
1902n/a
191035.6 C (96.1 F)
191137.8 C (100.0 F)
191235.6 C (96.1 F)
191336.7 C (98.1 F)
191435.6 C (96.1 F)
191534.4 C (93.9 F)
191638.3 C (100.9 F)
191736.7 C (98.1 F)
191840.6 C (105.1 F)
191937.2 C (99.0 F)
192034.4 C (93.9 F)
192140.0 C (104.0 F)
192234.4 C (93.9 F)
192336.1 C (97.0 F)
192437.2 C (99.0 F)
192536.7 C (98.1 F)
192636.7 C (98.1 F)
192735.0 C (95.0 F)
192833.9 C (93.0 F)
192935.6 C (96.1 F)
193037.8 C (100.0 F)
193136.7 C (98.1 F)
193238.3 C (100.9 F)
193338.3 C (100.9 F)
193437.8 C (100.0 F)
193534.4 C (93.9 F)
193640.0 C (104.0 F)
193737.2 C (99.0 F)
193836.1 C (97.0 F)
193937.2 C (99.0 F)
194037.2 C (99.0 F)
194136.1 C (97.0 F)
194235.6 C (96.1 F)
194336.1 C (97.0 F)
194437.2 C (99.0 F)
194536.1 C (97.0 F)
194636.1 C (97.0 F)
194735.0 C (95.0 F)
194837.8 C (100.0 F)
194937.2 C (99.0 F)
195036.7 C (98.1 F)
195133.9 C (93.0 F)
195237.2 C (99.0 F)
195335.6 C (96.1 F)
195438.3 C (100.9 F)
195538.3 C (100.9 F)
195635.0 C (95.0 F)
195738.3 C (100.9 F)
195834.4 C (93.9 F)
195937.2 C (99.0 F)
196034.4 C (93.9 F)
196133.3 C (91.9 F)
196234.4 C (93.9 F)
196340.0 C (104.0 F)
196440.0 C (104.0 F)

Coldest night (TNn)

Coldest night (TNn) at Bethlehem Lehigh UNIV by year The coldest night of the year at Bethlehem Lehigh UNIV, 1894 to 1964. The record is -26.7 C (-16.1 F) in 1912, marked on the chart; the median year is -16.9 C (1.5 F). -30-25-20-15-101900192019401960Record: -26.7 C (-16.1 F) in 1912
The coldest night of the year at Bethlehem Lehigh UNIV, 1894 to 1964. The record is -26.7 C (-16.1 F) in 1912, marked on the chart; the median year is -16.9 C (1.5 F).
Coldest night (TNn) at Bethlehem Lehigh UNIV by year
YearColdest night (TNn)
1894-16.1 C (3.0 F)
1895n/a
1896n/a
1897n/a
1898n/a
1899n/a
1900n/a
1901n/a
1902n/a
1910-17.8 C (0.0 F)
1911-11.1 C (12.0 F)
1912-26.7 C (-16.1 F)
1913-13.3 C (8.1 F)
1914-17.8 C (0.0 F)
1915-12.2 C (10.0 F)
1916-19.4 C (-2.9 F)
1917-22.8 C (-9.0 F)
1918-22.2 C (-8.0 F)
1919-21.1 C (-6.0 F)
1920-21.1 C (-6.0 F)
1921-18.9 C (-2.0 F)
1922-20.6 C (-5.1 F)
1923-16.7 C (1.9 F)
1924-17.2 C (1.0 F)
1925-22.2 C (-8.0 F)
1926-17.2 C (1.0 F)
1927-18.9 C (-2.0 F)
1928-15.6 C (3.9 F)
1929-15.0 C (5.0 F)
1930-16.7 C (1.9 F)
1931-12.2 C (10.0 F)
1932-13.9 C (7.0 F)
1933-19.4 C (-2.9 F)
1934-25.0 C (-13.0 F)
1935-19.4 C (-2.9 F)
1936-20.6 C (-5.1 F)
1937-10.0 C (14.0 F)
1938-17.8 C (0.0 F)
1939-13.3 C (8.1 F)
1940-16.1 C (3.0 F)
1941-12.2 C (10.0 F)
1942-18.9 C (-2.0 F)
1943-21.7 C (-7.1 F)
1944-14.4 C (6.1 F)
1945-18.9 C (-2.0 F)
1946-14.4 C (6.1 F)
1947-16.1 C (3.0 F)
1948-15.6 C (3.9 F)
1949-12.8 C (9.0 F)
1950-17.8 C (0.0 F)
1951-16.1 C (3.0 F)
1952-14.4 C (6.1 F)
1953-10.0 C (14.0 F)
1954-17.2 C (1.0 F)
1955-17.8 C (0.0 F)
1956-11.7 C (10.9 F)
1957-10.6 C (12.9 F)
1958-16.7 C (1.9 F)
1959-15.6 C (3.9 F)
1960-13.3 C (8.1 F)
1961-20.0 C (-4.0 F)
1962-19.4 C (-2.9 F)
1963-20.0 C (-4.0 F)
1964-14.4 C (6.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Bethlehem Lehigh UNIV by year The wettest day of the year at Bethlehem Lehigh UNIV, 1894 to 1964. The record is 129.5 mm (5.1 in) in 1935, marked on the chart; the median year is 64.3 mm (2.5 in). 0501001501900192019401960Record: 129.5 mm (5.1 in) in 1935
The wettest day of the year at Bethlehem Lehigh UNIV, 1894 to 1964. The record is 129.5 mm (5.1 in) in 1935, marked on the chart; the median year is 64.3 mm (2.5 in).
Wettest day (Rx1day) at Bethlehem Lehigh UNIV by year
YearWettest day (Rx1day)
1894118.6 mm (4.7 in)
189566.3 mm (2.6 in)
189687.6 mm (3.4 in)
189775.2 mm (3.0 in)
189872.9 mm (2.9 in)
189985.1 mm (3.4 in)
190060.5 mm (2.4 in)
190176.2 mm (3.0 in)
190273.4 mm (2.9 in)
191051.1 mm (2.0 in)
191163.8 mm (2.5 in)
191253.1 mm (2.1 in)
191360.7 mm (2.4 in)
191440.6 mm (1.6 in)
191559.7 mm (2.4 in)
191650.3 mm (2.0 in)
191749.5 mm (1.9 in)
191883.1 mm (3.3 in)
191951.8 mm (2.0 in)
192053.1 mm (2.1 in)
192161.0 mm (2.4 in)
192246.5 mm (1.8 in)
192361.7 mm (2.4 in)
192472.9 mm (2.9 in)
192571.1 mm (2.8 in)
192682.8 mm (3.3 in)
192774.2 mm (2.9 in)
192881.8 mm (3.2 in)
192968.1 mm (2.7 in)
193076.7 mm (3.0 in)
193177.7 mm (3.1 in)
193282.3 mm (3.2 in)
193355.9 mm (2.2 in)
193498.8 mm (3.9 in)
1935129.5 mm (5.1 in)
193655.9 mm (2.2 in)
193772.1 mm (2.8 in)
193899.8 mm (3.9 in)
193935.1 mm (1.4 in)
194063.0 mm (2.5 in)
194140.1 mm (1.6 in)
194272.9 mm (2.9 in)
194369.1 mm (2.7 in)
194439.6 mm (1.6 in)
194564.8 mm (2.6 in)
194658.9 mm (2.3 in)
194771.6 mm (2.8 in)
194857.4 mm (2.3 in)
194987.6 mm (3.4 in)
195087.1 mm (3.4 in)
1951104.1 mm (4.1 in)
195286.9 mm (3.4 in)
195361.5 mm (2.4 in)
195453.6 mm (2.1 in)
195592.2 mm (3.6 in)
195647.5 mm (1.9 in)
195744.7 mm (1.8 in)
195856.1 mm (2.2 in)
195952.8 mm (2.1 in)
1960100.3 mm (3.9 in)
196148.3 mm (1.9 in)
196257.7 mm (2.3 in)
196363.5 mm (2.5 in)
196426.7 mm (1.1 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Bethlehem Lehigh UNIV by year The wettest five days of the year at Bethlehem Lehigh UNIV, 1894 to 1964. The record is 195.8 mm (7.7 in) in 1919, marked on the chart; the median year is 91.0 mm (3.6 in). 0501001502001900192019401960Record: 195.8 mm (7.7 in) in 1919
The wettest five days of the year at Bethlehem Lehigh UNIV, 1894 to 1964. The record is 195.8 mm (7.7 in) in 1919, marked on the chart; the median year is 91.0 mm (3.6 in).
Wettest five days (Rx5day) at Bethlehem Lehigh UNIV by year
YearWettest five days (Rx5day)
1894147.3 mm (5.8 in)
189576.7 mm (3.0 in)
1896102.1 mm (4.0 in)
189775.2 mm (3.0 in)
189876.0 mm (3.0 in)
189988.1 mm (3.5 in)
190051.6 mm (2.0 in)
190188.4 mm (3.5 in)
1902109.0 mm (4.3 in)
191072.4 mm (2.9 in)
1911107.2 mm (4.2 in)
1912104.1 mm (4.1 in)
191384.6 mm (3.3 in)
191477.8 mm (3.1 in)
1915117.3 mm (4.6 in)
191694.5 mm (3.7 in)
191781.6 mm (3.2 in)
191883.1 mm (3.3 in)
1919195.8 mm (7.7 in)
192063.3 mm (2.5 in)
1921114.6 mm (4.5 in)
192258.2 mm (2.3 in)
192377.9 mm (3.1 in)
192494.0 mm (3.7 in)
192575.7 mm (3.0 in)
1926110.7 mm (4.4 in)
192783.1 mm (3.3 in)
192889.4 mm (3.5 in)
192975.9 mm (3.0 in)
193085.9 mm (3.4 in)
1931120.4 mm (4.7 in)
193290.9 mm (3.6 in)
1933153.5 mm (6.0 in)
1934113.8 mm (4.5 in)
1935171.4 mm (6.7 in)
193687.9 mm (3.5 in)
193799.0 mm (3.9 in)
1938163.3 mm (6.4 in)
193972.7 mm (2.9 in)
194073.7 mm (2.9 in)
194165.7 mm (2.6 in)
1942123.5 mm (4.9 in)
1943101.7 mm (4.0 in)
194477.5 mm (3.1 in)
194594.2 mm (3.7 in)
194693.2 mm (3.7 in)
194798.5 mm (3.9 in)
1948104.1 mm (4.1 in)
194998.8 mm (3.9 in)
195091.0 mm (3.6 in)
1951129.0 mm (5.1 in)
1952115.3 mm (4.5 in)
195380.8 mm (3.2 in)
195496.3 mm (3.8 in)
1955171.4 mm (6.7 in)
195660.5 mm (2.4 in)
1957110.7 mm (4.4 in)
195880.0 mm (3.1 in)
195985.0 mm (3.3 in)
1960111.5 mm (4.4 in)
196181.7 mm (3.2 in)
196270.4 mm (2.8 in)
1963113.8 mm (4.5 in)
196439.5 mm (1.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Bethlehem Lehigh UNIV by year The longest dry spell of the year at Bethlehem Lehigh UNIV, 1894 to 1964. The record is 44 days in 1924, marked on the chart; the median year is 18 days. 10203040501900192019401960Record: 44 days in 1924
The longest dry spell of the year at Bethlehem Lehigh UNIV, 1894 to 1964. The record is 44 days in 1924, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Bethlehem Lehigh UNIV by year
YearLongest dry spell (CDD)
189413 days
189518 days
189616 days
189717 days
189815 days
189918 days
190022 days
190128 days
190222 days
191018 days
191114 days
191217 days
191324 days
191423 days
191526 days
191633 days
191722 days
191818 days
191917 days
192019 days
192121 days
192224 days
192316 days
192444 days
192516 days
192616 days
192713 days
192814 days
192918 days
193027 days
193119 days
193218 days
193315 days
193416 days
193518 days
193614 days
193715 days
193814 days
193925 days
194013 days
194121 days
194225 days
194330 days
194418 days
194517 days
194622 days
194725 days
194819 days
194921 days
195015 days
195114 days
195216 days
195316 days
195414 days
195519 days
195616 days
195718 days
195820 days
195917 days
196018 days
196115 days
196220 days
196328 days
196420 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.

Frost Dates and Growing Season

42 years with a frost

Across 42 years with a frost, the median last spring frost at Bethlehem Lehigh UNIV falls on 13 April and the median first autumn frost on 25 October, which leaves a median of 191 days between them.

Fitted over all years, the growing season changes by +6.0 days per decade at this station.

Frost dates and growing season at Bethlehem Lehigh UNIV
MeasureMedian, all yearsEarliest periodRecent period (1929 to 1962)Recent against earliestFitted trend
Last spring frost13 Apriln/a13 Apriln/a-2.4 days per decade
First autumn frost25 Octobern/a27 Octobern/a+3.7 days per decade
Growing days191 daysn/a194 daysn/a+6.0 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

52 years, 1897 to 1963

A day with at least 65.7 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 125.5 mm (4.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Bethlehem Lehigh UNIV: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years65.7 mm (2.6 in)
5 years83.0 mm (3.3 in)
10 years93.9 mm (3.7 in)
25 years107.1 mm (4.2 in)
50 years116.5 mm (4.6 in)
100 years125.5 mm (4.9 in)Longer than the 52 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, 52 years of values from 1897 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: 129.5 mm (5.1 in) in 1935; 104.1 mm (4.1 in) in 1951; 100.3 mm (3.9 in) in 1960.

Station Changes

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

Download the Data

  • Data for Bethlehem Lehigh UNIV standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Bethlehem Lehigh UNIV 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 (2025-12-31).