Built 2026-10-16 (16 October 2026)

Snoqualmie Pass Weather Records (USC00457781)

Record envelope, standing records and threshold days for Snoqualmie Pass (USC00457781), Washington, United States, with 63 years of record.

Key Facts for Snoqualmie Pass

  • Snoqualmie Pass (USC00457781) is a weather station in Washington, United States at 47.42 latitude and -121.41 longitude, 921 m (3,020 ft) above sea level.
  • The station reports from 1910 to 1972, 63 years of record.
  • 1,464 records set at Snoqualmie Pass still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Snoqualmie Pass set a daily record precipitation of 91.7 mm (3.6 in) on 16 February 1972.

About the Station

  • Location: Washington, United States, 47.42 latitude, -121.41 longitude.
  • Elevation: 921 m (3,020 ft).
  • Period of record: 1910 to 1972, 63 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 Snoqualmie Pass, with 2026 drawn through them The band shows the record high and record low for each calendar day at Snoqualmie Pass. 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 Snoqualmie Pass. 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 Snoqualmie Pass, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan13.3 C (55.9 F)-27.2 C (-17.0 F)n/an/a
Feb16.1 C (61.0 F)-26.1 C (-15.0 F)n/an/a
Mar20.6 C (69.1 F)-17.8 C (0.0 F)n/an/a
Apr27.2 C (81.0 F)-13.9 C (7.0 F)n/an/a
May28.9 C (84.0 F)-8.9 C (16.0 F)n/an/a
Jun34.4 C (93.9 F)-2.8 C (27.0 F)n/an/a
Jul38.3 C (100.9 F)-1.1 C (30.0 F)n/an/a
Aug36.7 C (98.1 F)-2.8 C (27.0 F)n/an/a
Sep38.3 C (100.9 F)-5.6 C (21.9 F)n/an/a
Oct31.1 C (88.0 F)-11.7 C (10.9 F)n/an/a
Nov18.3 C (64.9 F)-17.8 C (0.0 F)n/an/a
Dec11.7 C (53.1 F)-28.3 C (-18.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Snoqualmie Pass by the year they were set 1,464 records at Snoqualmie Pass still stand. 1918 holds the most, with 59. 02040601915: 71916: 511917: 381918: 591919: 251920: 131921: 391922: 271923: 401924: 351925: 141926: 521927: 371928: 251929: 221930: 251931: 281932: 281933: 361934: 391935: 371936: 451937: 191938: 191939: 211940: 171941: 301942: 331943: 131944: 261945: 181946: 151947: 241948: 181949: 221950: 241951: 121952: 61953: 191954: 111955: 281956: 231957: 161958: 331959: 111960: 331961: 261962: 261963: 321964: 231965: 301966: 181967: 201968: 341969: 251970: 131972: 41915192119271933193919451951195719631969
1,464 records at Snoqualmie Pass still stand. 1918 holds the most, with 59.
Standing records at Snoqualmie Pass by the year they were set
Year setStanding records
19157
191651
191738
191859
191925
192013
192139
192227
192340
192435
192514
192652
192737
192825
192922
193025
193128
193228
193336
193439
193537
193645
193719
193819
193921
194017
194130
194233
194313
194426
194518
194615
194724
194818
194922
195024
195112
19526
195319
195411
195528
195623
195716
195833
195911
196033
196126
196226
196332
196423
196530
196618
196720
196834
196925
197013
19724

All-Time Record Progression

11 new records
When Snoqualmie Pass set new all-time records 11 all-time records were set at Snoqualmie Pass between 28 February 1956 and 31 December 1968. Each dot is a new record. Record snow depthRecord daily snowfallRecord low minimum temperatureRecord low maximum temperature28 February 1956: Record snow depth 500.4 cm (197.0 in)1 March 1956: Record snow depth 502.9 cm (198.0 in)2 March 1956: Record snow depth 508.0 cm (200.0 in)4 March 1956: Record snow depth 533.4 cm (210.0 in)5 March 1956: Record snow depth 546.1 cm (215.0 in)6 March 1956: Record snow depth 553.7 cm (218.0 in)9 March 1956: Record snow depth 569.0 cm (224.0 in)10 March 1956: Record snow depth 571.5 cm (225.0 in)2 January 1965: Record daily snowfall 111.8 cm (44.0 in)30 December 1968: Record low minimum temperature -28.3 C (-18.9 F)31 December 1968: Record low maximum temperature -20.0 C (-4.0 F)19601965
11 all-time records were set at Snoqualmie Pass between 28 February 1956 and 31 December 1968. Each dot is a new record.
When Snoqualmie Pass set new all-time records
DateKindDetail
1956-02-28Record snow depthRecord snow depth 500.4 cm (197.0 in)
1956-03-01Record snow depthRecord snow depth 502.9 cm (198.0 in)
1956-03-02Record snow depthRecord snow depth 508.0 cm (200.0 in)
1956-03-04Record snow depthRecord snow depth 533.4 cm (210.0 in)
1956-03-05Record snow depthRecord snow depth 546.1 cm (215.0 in)
1956-03-06Record snow depthRecord snow depth 553.7 cm (218.0 in)
1956-03-09Record snow depthRecord snow depth 569.0 cm (224.0 in)
1956-03-10Record snow depthRecord snow depth 571.5 cm (225.0 in)
1965-01-02Record daily snowfallRecord daily snowfall 111.8 cm (44.0 in)
1968-12-30Record low minimum temperatureRecord low minimum temperature -28.3 C (-18.9 F)
1968-12-31Record low maximum temperatureRecord low maximum temperature -20.0 C (-4.0 F)

Wettest Day of Each Month

Oct: 170.2 mm (6.7 in)
Record daily precipitation for each month at Snoqualmie Pass The wettest day on record for each calendar month at Snoqualmie Pass. The most was 170.2 mm (6.7 in) on 21 October 1934. 050100150200 Jan: 111.8 mm (4.4 in), 22 January 1919 Jan Feb: 159.5 mm (6.3 in), 9 February 1951 Feb Mar: 102.4 mm (4.0 in), 5 March 1932 Mar Apr: 76.2 mm (3.0 in), 18 April 1938 Apr May: 53.8 mm (2.1 in), 17 May 1936 May Jun: 73.7 mm (2.9 in), 21 June 1937 Jun Jul: 47.0 mm (1.9 in), 5 July 1961 Jul Aug: 127.0 mm (5.0 in), 29 August 1920 Aug Sep: 127.0 mm (5.0 in), 13 September 1920 Sep Oct: 170.2 mm (6.7 in), 21 October 1934 Oct Nov: 154.9 mm (6.1 in), 13 November 1932 Nov Dec: 142.5 mm (5.6 in), 6 December 1933 Dec
The wettest day on record for each calendar month at Snoqualmie Pass. The most was 170.2 mm (6.7 in) on 21 October 1934.
Record daily precipitation for each month at Snoqualmie Pass
MonthRecord daily precipitation (mm)Date
Jan111.8 mm (4.4 in)22 January 1919
Feb159.5 mm (6.3 in)9 February 1951
Mar102.4 mm (4.0 in)5 March 1932
Apr76.2 mm (3.0 in)18 April 1938
May53.8 mm (2.1 in)17 May 1936
Jun73.7 mm (2.9 in)21 June 1937
Jul47.0 mm (1.9 in)5 July 1961
Aug127.0 mm (5.0 in)29 August 1920
Sep127.0 mm (5.0 in)13 September 1920
Oct170.2 mm (6.7 in)21 October 1934
Nov154.9 mm (6.1 in)13 November 1932
Dec142.5 mm (5.6 in)6 December 1933

Period of Record Coverage

1915 to 1972
Days with data per year at Snoqualmie Pass 58 years of record at Snoqualmie Pass, 1915 to 1972. 21 years have data for under 90 percent of days and are left out of rankings: 1915, 1918, 1919, 1920, 1929, 1930, 1934, 1935 and others. 1915: 51 of 365 days1916: 365 of 366 days1917: 358 of 365 days1918: 326 of 365 days1919: 258 of 365 days1920: 206 of 366 days1921: 356 of 365 days1922: 361 of 365 days1923: 332 of 365 days1924: 347 of 366 days1925: 359 of 365 days1926: 353 of 365 days1927: 365 of 365 days1928: 334 of 366 days1929: 265 of 365 days1930: 280 of 365 days1931: 365 of 365 days1932: 366 of 366 days1933: 365 of 365 days1934: 307 of 365 days1935: 328 of 365 days1936: 321 of 366 days1937: 357 of 365 days1938: 353 of 365 days1939: 353 of 365 days1940: 353 of 366 days1941: 365 of 365 days1942: 365 of 365 days1943: 347 of 365 days1944: 365 of 366 days1945: 217 of 365 days1946: 287 of 365 days1947: 261 of 365 days1948: 282 of 366 days1949: 261 of 365 days1950: 248 of 365 days1951: 82 of 365 days1952: 83 of 366 days1953: 324 of 365 days1954: 320 of 365 days1955: 349 of 365 days1956: 364 of 366 days1957: 352 of 365 days1958: 353 of 365 days1959: 361 of 365 days1960: 366 of 366 days1961: 364 of 365 days1962: 362 of 365 days1963: 364 of 365 days1964: 364 of 366 days1965: 362 of 365 days1966: 362 of 365 days1967: 361 of 365 days1968: 330 of 366 days1969: 358 of 365 days1970: 352 of 365 days1971: 54 of 365 days1972: 49 of 366 days192019301940195019601970
58 years of record at Snoqualmie Pass, 1915 to 1972. 21 years have data for under 90 percent of days and are left out of rankings: 1915, 1918, 1919, 1920, 1929, 1930, 1934, 1935 and others.
Days with data per year at Snoqualmie Pass
YearDays with dataShare of yearComplete
19155114%No
1916365100%Yes
191735898%Yes
191832689%No
191925871%No
192020656%No
192135698%Yes
192236199%Yes
192333291%Yes
192434795%Yes
192535998%Yes
192635397%Yes
1927365100%Yes
192833491%Yes
192926573%No
193028077%No
1931365100%Yes
1932366100%Yes
1933365100%Yes
193430784%No
193532890%No
193632188%No
193735798%Yes
193835397%Yes
193935397%Yes
194035396%Yes
1941365100%Yes
1942365100%Yes
194334795%Yes
1944365100%Yes
194521759%No
194628779%No
194726172%No
194828277%No
194926172%No
195024868%No
19518222%No
19528323%No
195332489%No
195432088%No
195534996%Yes
195636499%Yes
195735296%Yes
195835397%Yes
195936199%Yes
1960366100%Yes
1961364100%Yes
196236299%Yes
1963364100%Yes
196436499%Yes
196536299%Yes
196636299%Yes
196736199%Yes
196833090%Yes
196935898%Yes
197035296%Yes
19715415%No
19724913%No

Latest Records

20
Latest records at Snoqualmie Pass
DateStationRecordValueBeat old record byOld record stoodSignificance
16 February 1972Snoqualmie Pass, USdaily rain91.7 mm (3.6 in)34.5 mm (1.4 in)17 years30 of 100 (Routine)
13 February 1972Snoqualmie Pass, USdaily rain96.0 mm (3.8 in)40.4 mm (1.6 in)4 years30 of 100 (Routine)
6 February 1972Snoqualmie Pass, USdaily low max-6.1 C (21.0 F)2.2 C (4.0 F)36 years20 of 100 (Routine)
5 February 1972Snoqualmie Pass, USdaily low max-6.7 C (19.9 F)1.1 C (2.0 F)56 years23 of 100 (Routine)
5 February 1972Snoqualmie Pass, USdaily low min-15.0 C (5.0 F)4.4 C (7.9 F)24 years21 of 100 (Routine)
4 February 1972Snoqualmie Pass, USdaily low min-17.8 C (0.0 F)2.2 C (4.0 F)40 years21 of 100 (Routine)
20 January 1972Snoqualmie Pass, USdaily rain82.3 mm (3.2 in)3.8 mm (0.15 in)21 years13 of 100 (Routine)
21 December 1971Snoqualmie Pass, USdaily snowfall56.6 cm (22.3 in)26.1 cm (10.3 in)45 years39 of 100 (Notable)
15 December 1971Snoqualmie Pass, USdaily snow depth (Tie)203.2 cm (80.0 in)tie0 years1 of 100 (Routine)
14 December 1971Snoqualmie Pass, USdaily snowfall39.4 cm (15.5 in)22.9 cm (9.0 in)34 years33 of 100 (Routine)
8 December 1971Snoqualmie Pass, USdaily low max (Tie)-6.7 C (19.9 F)tie38 years4 of 100 (Routine)
5 December 1971Snoqualmie Pass, USdaily rain86.4 mm (3.4 in)34.3 mm (1.4 in)17 years27 of 100 (Routine)
30 December 1970Snoqualmie Pass, USdaily snowfall50.8 cm (20.0 in)15.2 cm (6.0 in)60 years35 of 100 (Notable)
15 December 1970Snoqualmie Pass, USdaily snow depth203.2 cm (80.0 in)22.9 cm (9.0 in)55 years25 of 100 (Routine)
1 December 1970Snoqualmie Pass, USdaily snowfall (Tie)40.6 cm (16.0 in)tie8 years2 of 100 (Routine)
23 November 1970Snoqualmie Pass, USdaily low max-8.3 C (17.1 F)6.1 C (11.0 F)29 years28 of 100 (Routine)
22 November 1970Snoqualmie Pass, USdaily low max-7.8 C (18.0 F)5.0 C (9.0 F)29 years25 of 100 (Routine)
26 October 1970Snoqualmie Pass, USdaily low min (Tie)-4.4 C (24.1 F)tie51 years5 of 100 (Routine)
7 October 1970Snoqualmie Pass, USdaily low min (Tie)-2.2 C (28.0 F)tie43 years4 of 100 (Routine)
3 October 1970Snoqualmie Pass, USdaily high max26.1 C (79.0 F)1.7 C (3.1 F)17 years13 of 100 (Routine)

Climate Trend

35 complete years, 1916 to 1970
Annual mean temperature at Snoqualmie Pass as warming stripes, 1916 to 1970 One stripe for each of 35 complete years at Snoqualmie Pass, 1916 to 1970. Blue stripes are years cooler than the station's own mean of 5.4 C (41.7 F); red stripes are warmer. The coolest year was 1916, at 4.0 C (39.2 F), and the warmest was 1958, at 7.1 C (44.8 F). The strongest colour marks a difference of 1.8 C (3.2 F). 1916: 4.0 C, -1.4 C from the station mean1917: 4.9 C, -0.5 C from the station mean1921: 4.7 C, -0.7 C from the station mean1922: 4.4 C, -1.0 C from the station mean1923: 4.9 C, -0.5 C from the station mean1924: 4.9 C, -0.5 C from the station mean1925: 6.0 C, +0.6 C from the station mean1927: 5.1 C, -0.3 C from the station mean1931: 5.1 C, -0.3 C from the station mean1932: 4.2 C, -1.2 C from the station mean1933: 4.6 C, -0.8 C from the station mean1937: 5.1 C, -0.3 C from the station mean1938: 6.1 C, +0.7 C from the station mean1939: 6.0 C, +0.6 C from the station mean1940: 6.2 C, +0.8 C from the station mean1941: 6.5 C, +1.1 C from the station mean1942: 6.1 C, +0.7 C from the station mean1943: 5.8 C, +0.4 C from the station mean1944: 6.0 C, +0.5 C from the station mean1948: 4.0 C, -1.4 C from the station mean1955: 4.1 C, -1.3 C from the station mean1956: 5.2 C, -0.2 C from the station mean1957: 5.6 C, +0.1 C from the station mean1958: 7.1 C, +1.7 C from the station mean1959: 5.3 C, -0.1 C from the station mean1960: 5.6 C, +0.2 C from the station mean1961: 6.0 C, +0.6 C from the station mean1962: 5.7 C, +0.3 C from the station mean1963: 6.1 C, +0.7 C from the station mean1964: 4.5 C, -0.9 C from the station mean1965: 6.1 C, +0.7 C from the station mean1966: 5.9 C, +0.5 C from the station mean1967: 6.7 C, +1.2 C from the station mean1969: 5.2 C, -0.2 C from the station mean1970: 5.5 C, 0.0 C from the station mean191619201925193019351940194519501955196019651970
One stripe for each of 35 complete years at Snoqualmie Pass, 1916 to 1970. Blue stripes are years cooler than the station's own mean of 5.4 C (41.7 F); red stripes are warmer. The coolest year was 1916, at 4.0 C (39.2 F), and the warmest was 1958, at 7.1 C (44.8 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Snoqualmie Pass as warming stripes, 1916 to 1970
YearAnnual mean temperatureDifference from the station mean
19164.0 C-1.38 C
19174.9 C-0.50 C
19214.7 C-0.68 C
19224.4 C-1.01 C
19234.9 C-0.52 C
19244.9 C-0.51 C
19256.0 C+0.63 C
19275.1 C-0.34 C
19315.1 C-0.27 C
19324.2 C-1.16 C
19334.6 C-0.81 C
19375.1 C-0.32 C
19386.1 C+0.68 C
19396.0 C+0.56 C
19406.2 C+0.82 C
19416.5 C+1.14 C
19426.1 C+0.74 C
19435.8 C+0.43 C
19446.0 C+0.55 C
19484.0 C-1.38 C
19554.1 C-1.30 C
19565.2 C-0.16 C
19575.6 C+0.15 C
19587.1 C+1.73 C
19595.3 C-0.13 C
19605.6 C+0.16 C
19616.0 C+0.57 C
19625.7 C+0.31 C
19636.1 C+0.67 C
19644.5 C-0.91 C
19656.1 C+0.74 C
19665.9 C+0.47 C
19676.7 C+1.25 C
19695.2 C-0.16 C
19705.5 C+0.05 C

The annual mean temperature here has risen by 0.19 C (0.04 to 0.34) per decade over 1916 to 1970. In Fahrenheit: 0.3 F (0.1 to 0.6) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Snoqualmie Pass
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.19 C (0.04 to 0.34) per decade0.3 F (0.1 to 0.6) per decade1916 to 197035Rise
Mean daily maximum0.16 C (-0.01 to 0.32) per decade0.29 F (-0.01 to 0.58) per decade1916 to 197035Not clearly different from zero
Mean daily minimum0.2 C (0.1 to 0.4) per decade0.4 F (0.1 to 0.7) per decade1916 to 197035Rise

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

1910 to 1972
Yearly extremes at Snoqualmie Pass: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)38.3 C (100.9 F)193831.7 C (89.1 F)58
Coldest night (TNn)-28.3 C (-18.9 F)1968-18.3 C (-1.0 F)58
Wettest day (Rx1day)170.2 mm (6.7 in)193488.9 mm (3.5 in)61
Wettest five days (Rx5day)411.3 mm (16.2 in)1959213.6 mm (8.4 in)60
Longest dry spell (CDD)61 days192524 days61

Hottest day (TXx)

Hottest day (TXx) at Snoqualmie Pass by year The hottest day of the year at Snoqualmie Pass, 1910 to 1972. The record is 38.3 C (100.9 F) in 1938, marked on the chart; the median year is 31.7 C (89.1 F). 010203040192019401960Record: 38.3 C (100.9 F) in 1938
The hottest day of the year at Snoqualmie Pass, 1910 to 1972. The record is 38.3 C (100.9 F) in 1938, marked on the chart; the median year is 31.7 C (89.1 F).
Hottest day (TXx) at Snoqualmie Pass by year
YearHottest day (TXx)
1910n/a
1911n/a
1912n/a
1913n/a
1914n/a
191523.3 C (73.9 F)
191630.0 C (86.0 F)
191728.3 C (82.9 F)
191827.2 C (81.0 F)
191931.7 C (89.1 F)
192031.1 C (88.0 F)
192129.4 C (84.9 F)
192231.7 C (89.1 F)
192331.7 C (89.1 F)
192431.7 C (89.1 F)
192533.3 C (91.9 F)
192632.8 C (91.0 F)
192733.3 C (91.9 F)
192831.7 C (89.1 F)
192930.6 C (87.1 F)
193031.7 C (89.1 F)
193131.7 C (89.1 F)
193227.2 C (81.0 F)
193333.9 C (93.0 F)
193434.4 C (93.9 F)
193535.0 C (95.0 F)
193633.9 C (93.0 F)
193733.3 C (91.9 F)
193838.3 C (100.9 F)
193931.7 C (89.1 F)
194032.2 C (90.0 F)
194136.7 C (98.1 F)
194235.6 C (96.1 F)
194330.6 C (87.1 F)
194432.8 C (91.0 F)
194528.9 C (84.0 F)
194633.3 C (91.9 F)
194730.6 C (87.1 F)
194829.4 C (84.9 F)
194927.8 C (82.0 F)
195030.0 C (86.0 F)
195123.3 C (73.9 F)
195230.0 C (86.0 F)
195331.1 C (88.0 F)
195427.2 C (81.0 F)
195532.2 C (90.0 F)
195636.7 C (98.1 F)
195730.0 C (86.0 F)
195832.8 C (91.0 F)
195931.7 C (89.1 F)
196035.0 C (95.0 F)
196136.7 C (98.1 F)
196227.2 C (81.0 F)
196331.7 C (89.1 F)
196428.9 C (84.0 F)
196533.3 C (91.9 F)
196630.6 C (87.1 F)
196732.2 C (90.0 F)
196831.1 C (88.0 F)
196930.6 C (87.1 F)
197032.2 C (90.0 F)
19718.3 C (46.9 F)
19727.2 C (45.0 F)

Coldest night (TNn)

Coldest night (TNn) at Snoqualmie Pass by year The coldest night of the year at Snoqualmie Pass, 1910 to 1972. The record is -28.3 C (-18.9 F) in 1968, marked on the chart; the median year is -18.3 C (-1.0 F). -30-25-20-15-10-5192019401960Record: -28.3 C (-18.9 F) in 1968
The coldest night of the year at Snoqualmie Pass, 1910 to 1972. The record is -28.3 C (-18.9 F) in 1968, marked on the chart; the median year is -18.3 C (-1.0 F).
Coldest night (TNn) at Snoqualmie Pass by year
YearColdest night (TNn)
1910n/a
1911n/a
1912n/a
1913n/a
1914n/a
1915-15.6 C (3.9 F)
1916-21.1 C (-6.0 F)
1917-16.7 C (1.9 F)
1918-17.2 C (1.0 F)
1919-16.1 C (3.0 F)
1920-12.8 C (9.0 F)
1921-16.7 C (1.9 F)
1922-22.8 C (-9.0 F)
1923-18.9 C (-2.0 F)
1924-25.0 C (-13.0 F)
1925-12.2 C (10.0 F)
1926-21.1 C (-6.0 F)
1927-26.1 C (-15.0 F)
1928-17.8 C (0.0 F)
1929-26.1 C (-15.0 F)
1930-21.7 C (-7.1 F)
1931-14.4 C (6.1 F)
1932-21.1 C (-6.0 F)
1933-26.1 C (-15.0 F)
1934-8.9 C (16.0 F)
1935-24.4 C (-11.9 F)
1936-23.9 C (-11.0 F)
1937-23.9 C (-11.0 F)
1938-12.2 C (10.0 F)
1939-17.8 C (0.0 F)
1940-12.8 C (9.0 F)
1941-16.7 C (1.9 F)
1942-18.9 C (-2.0 F)
1943-27.2 C (-17.0 F)
1944-16.7 C (1.9 F)
1945-11.7 C (10.9 F)
1946-15.0 C (5.0 F)
1947-11.1 C (12.0 F)
1948-18.9 C (-2.0 F)
1949-22.2 C (-8.0 F)
1950-26.7 C (-16.1 F)
1951-21.7 C (-7.1 F)
1952-9.4 C (15.1 F)
1953-10.6 C (12.9 F)
1954-18.9 C (-2.0 F)
1955-17.8 C (0.0 F)
1956-21.7 C (-7.1 F)
1957-25.0 C (-13.0 F)
1958-13.9 C (7.0 F)
1959-20.6 C (-5.1 F)
1960-16.1 C (3.0 F)
1961-15.6 C (3.9 F)
1962-24.4 C (-11.9 F)
1963-21.7 C (-7.1 F)
1964-25.6 C (-14.1 F)
1965-13.9 C (7.0 F)
1966-13.3 C (8.1 F)
1967-15.6 C (3.9 F)
1968-28.3 C (-18.9 F)
1969-24.4 C (-11.9 F)
1970-13.3 C (8.1 F)
1971-12.2 C (10.0 F)
1972-21.1 C (-6.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Snoqualmie Pass by year The wettest day of the year at Snoqualmie Pass, 1910 to 1972. The record is 170.2 mm (6.7 in) in 1934, marked on the chart; the median year is 88.9 mm (3.5 in). 050100150200192019401960Record: 170.2 mm (6.7 in) in 1934
The wettest day of the year at Snoqualmie Pass, 1910 to 1972. The record is 170.2 mm (6.7 in) in 1934, marked on the chart; the median year is 88.9 mm (3.5 in).
Wettest day (Rx1day) at Snoqualmie Pass by year
YearWettest day (Rx1day)
1910n/a
1911n/a
19122.5 mm (0.10 in)
191321.3 mm (0.8 in)
19140.0 mm (0.00 in)
191596.5 mm (3.8 in)
191681.3 mm (3.2 in)
191775.2 mm (3.0 in)
1918127.0 mm (5.0 in)
1919111.8 mm (4.4 in)
1920127.0 mm (5.0 in)
1921125.7 mm (4.9 in)
192266.0 mm (2.6 in)
192399.1 mm (3.9 in)
192487.6 mm (3.4 in)
192573.7 mm (2.9 in)
1926103.9 mm (4.1 in)
1927104.6 mm (4.1 in)
192883.8 mm (3.3 in)
192963.5 mm (2.5 in)
193055.9 mm (2.2 in)
193166.5 mm (2.6 in)
1932154.9 mm (6.1 in)
1933142.5 mm (5.6 in)
1934170.2 mm (6.7 in)
193577.2 mm (3.0 in)
193699.3 mm (3.9 in)
1937119.4 mm (4.7 in)
193876.2 mm (3.0 in)
193968.6 mm (2.7 in)
194089.7 mm (3.5 in)
194178.2 mm (3.1 in)
1942144.3 mm (5.7 in)
194388.9 mm (3.5 in)
194473.4 mm (2.9 in)
1945157.5 mm (6.2 in)
1946122.2 mm (4.8 in)
194771.1 mm (2.8 in)
194855.6 mm (2.2 in)
1949110.2 mm (4.3 in)
195078.5 mm (3.1 in)
1951159.5 mm (6.3 in)
195248.5 mm (1.9 in)
195388.4 mm (3.5 in)
195468.6 mm (2.7 in)
1955121.7 mm (4.8 in)
1956113.5 mm (4.5 in)
195769.6 mm (2.7 in)
1958116.3 mm (4.6 in)
1959134.1 mm (5.3 in)
196064.0 mm (2.5 in)
196178.0 mm (3.1 in)
196281.8 mm (3.2 in)
196396.3 mm (3.8 in)
196491.4 mm (3.6 in)
1965101.3 mm (4.0 in)
196678.5 mm (3.1 in)
1967101.9 mm (4.0 in)
196888.9 mm (3.5 in)
1969103.6 mm (4.1 in)
197057.4 mm (2.3 in)
197195.3 mm (3.8 in)
197296.0 mm (3.8 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Snoqualmie Pass by year The wettest five days of the year at Snoqualmie Pass, 1910 to 1972. The record is 411.3 mm (16.2 in) in 1959, marked on the chart; the median year is 213.6 mm (8.4 in). 0200400600192019401960Record: 411.3 mm (16.2 in) in 1959
The wettest five days of the year at Snoqualmie Pass, 1910 to 1972. The record is 411.3 mm (16.2 in) in 1959, marked on the chart; the median year is 213.6 mm (8.4 in).
Wettest five days (Rx5day) at Snoqualmie Pass by year
YearWettest five days (Rx5day)
1910n/a
1911n/a
19123.5 mm (0.14 in)
191335.7 mm (1.4 in)
1914n/a
1915165.1 mm (6.5 in)
1916212.1 mm (8.4 in)
1917182.9 mm (7.2 in)
1918232.4 mm (9.1 in)
1919261.6 mm (10.3 in)
1920299.7 mm (11.8 in)
1921301.0 mm (11.9 in)
1922106.7 mm (4.2 in)
1923210.8 mm (8.3 in)
1924202.2 mm (8.0 in)
1925190.5 mm (7.5 in)
1926117.1 mm (4.6 in)
1927198.6 mm (7.8 in)
1928168.3 mm (6.6 in)
1929157.7 mm (6.2 in)
1930108.1 mm (4.3 in)
1931165.4 mm (6.5 in)
1932376.4 mm (14.8 in)
1933402.4 mm (15.8 in)
1934273.5 mm (10.8 in)
1935251.6 mm (9.9 in)
1936290.3 mm (11.4 in)
1937275.9 mm (10.9 in)
1938172.2 mm (6.8 in)
1939217.7 mm (8.6 in)
1940183.7 mm (7.2 in)
1941176.8 mm (7.0 in)
1942253.2 mm (10.0 in)
1943245.4 mm (9.7 in)
1944161.5 mm (6.4 in)
1945218.7 mm (8.6 in)
1946297.7 mm (11.7 in)
1947243.8 mm (9.6 in)
1948182.1 mm (7.2 in)
1949270.0 mm (10.6 in)
1950178.8 mm (7.0 in)
1951355.9 mm (14.0 in)
1952137.7 mm (5.4 in)
1953236.2 mm (9.3 in)
1954224.9 mm (8.9 in)
1955215.1 mm (8.5 in)
1956307.0 mm (12.1 in)
1957183.5 mm (7.2 in)
1958264.4 mm (10.4 in)
1959411.3 mm (16.2 in)
1960179.6 mm (7.1 in)
1961190.5 mm (7.5 in)
1962181.7 mm (7.2 in)
1963171.2 mm (6.7 in)
1964199.3 mm (7.8 in)
1965330.3 mm (13.0 in)
1966195.4 mm (7.7 in)
1967225.3 mm (8.9 in)
1968238.8 mm (9.4 in)
1969275.1 mm (10.8 in)
1970164.3 mm (6.5 in)
1971224.4 mm (8.8 in)
1972291.9 mm (11.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Snoqualmie Pass by year The longest dry spell of the year at Snoqualmie Pass, 1910 to 1972. The record is 61 days in 1925, marked on the chart; the median year is 24 days. 020406080192019401960Record: 61 days in 1925
The longest dry spell of the year at Snoqualmie Pass, 1910 to 1972. The record is 61 days in 1925, marked on the chart; the median year is 24 days.
Longest dry spell (CDD) at Snoqualmie Pass by year
YearLongest dry spell (CDD)
1910n/a
1911n/a
191224 days
191331 days
19143 days
19153 days
191628 days
191739 days
191837 days
191926 days
192041 days
192120 days
192248 days
192331 days
192429 days
192561 days
192657 days
192716 days
192838 days
192927 days
193033 days
193134 days
193217 days
193326 days
193411 days
193529 days
193643 days
193723 days
193827 days
193923 days
194035 days
194123 days
194238 days
194321 days
194416 days
194523 days
19468 days
194717 days
194812 days
194913 days
195030 days
195118 days
195219 days
195321 days
195412 days
195523 days
195622 days
195726 days
195830 days
195915 days
196035 days
196138 days
196215 days
196317 days
196416 days
196541 days
196618 days
196755 days
196824 days
196958 days
197031 days
19714 days
19729 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

35 years with a frost

Across 35 years with a frost, the median last spring frost at Snoqualmie Pass falls on 28 May and the median first autumn frost on 18 September, which leaves a median of 113 days between them.

Fitted over all years, the growing season changes by +3.8 days per decade at this station.

Frost dates and growing season at Snoqualmie Pass
MeasureMedian, all yearsEarliest periodRecent period (1924 to 1970)Recent against earliestFitted trend
Last spring frost28 Mayn/a28 Mayn/a-3.4 days per decade
First autumn frost18 Septembern/a18 Septembern/a+0.4 days per decade
Growing days113 daysn/a116 daysn/a+3.8 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

38 years, 1916 to 1970

A day with at least 88.2 mm (3.5 in) of rain is expected about once in 2 years. A day with at least 182.1 mm (7.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Snoqualmie Pass: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years88.2 mm (3.5 in)
5 years110.8 mm (4.4 in)
10 years126.7 mm (5.0 in)
25 years148.0 mm (5.8 in)
50 years164.7 mm (6.5 in)Longer than the 38 years of record
100 years182.1 mm (7.2 in)Longer than the 38 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, 38 years of values from 1916 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: 154.9 mm (6.1 in) in 1932; 144.3 mm (5.7 in) in 1942; 142.5 mm (5.6 in) in 1933.

Download the Data

  • Data for Snoqualmie Pass standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Snoqualmie Pass 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).