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Climatological Report (Annual)
Issued by NWS Portland, OR
Issued by NWS Portland, OR
091
CXUS56 KPQR 011953
CLAEUG
ANNUAL CLIMATE REPORT
NATIONAL WEATHER SERVICE PORTLAND OR
1152 AM PST FRI 1 JAN 2021
...EUGENE 2020 WEATHER IN REVIEW...
===============================================================
2020 NOTABLE RECORDS AND WEATHER EVENTS...
*** 10TH WARMEST YEAR (PERIOD 1893-2020) ***
*** 2ND WARMEST JANUARY
*** 9TH DRIEST FEBRUARY
*** DAMAGING THUNDERSTORMS IN EARLY MAY
*** DRY AND WARM SUMMER (8TH WARMEST)
*** SEPTEMBER WILDFIRES, SMOKE AND STRONG THUNDERSTORMS
MONTHLY WEATHER SUMMARIES...
JANUARY...2020 STARTED WET AND MILD. NORMALLY, EUGENE WOULD
SEE 12 NIGHTS AT/OR BELOW FREEZING. BUT, ONLY 3 SUCH DAYS
THIS YEAR (14TH TO 17TH). DURING THAT TIME, LIGHT SNOW
FELL IN/AND AROUND THE EUGENE AREA, BUT LESS THAN AN INCH
OF ACCUMULATION. ON THE 15TH, A STRONG FRONT PUSHED MILD
AIR BACK INTO THE REGION, WITH SOUTH WINDS GUSTING UP TO
50 MPH. ANOTHER STRONG FRONT ON THE 23RD TO 24TH BROUGHT
MORE RAIN AND BREEZY SOUTH WINDS. MEASUREABLE RAIN (AT
LEAST 0.01 INCH) FELL ON 26 DAYS. THIS WAS THE MOST FOR
A JANUARY SINCE JAN 1953, WHICH ALSO SAW 26 RAINY DAYS.
OVERALL, THE MILD TEMPERATURES RESULTED IN MAKING JANUARY
2020 THE 2ND WARMEST JANUARY ON RECORD, WITH A MEAN
TEMPERATURE OF 46.5 DEG (RECORD WAS 46.9 IN JAN 1953).
FEBRUARY...A STRONG FRONT ON THE 1ST BROUGHT COOLER AIR INTO
THE REGION FOR THE 2ND THROUGH THE 4TH. OVERNIGHT LOWS
DROPPED INTO THE MIDDLE 20S. IN ADDITION, THERE WAS LIGHT
SNOW AT TIMES ON THE 3RD, BUT MOST AREAS AROUND TOWN SAW
A DUSTING TO A HALF INCH OF SNOW. AFTER THE 16TH, HIGH
PRESSURE OVER THE REGION KEPT THE EUGENE AREA MOSTLY DRY
WITH LATE NIGHT/MORNING FOG. TOTAL RAINFALL FROM 16TH
TO THE 29TH WAS ONLY 0.26 INCH, FAR BELOW NORMAL. THIS
CONTRIBUTED TO MAKING FEB 2020 THE 9TH DRIEST FEBRUARY,
WITH TOTAL RAINFALL ONLY ABOUT 25% OF NORMAL.
MARCH...RATHER TYPICAL MARCH, WITH MIX OF CLOUDS, RAIN,
SUNSHINE, AND SHOWERS. BUT, EVEN WITH THAT, THERE WAS A
TOUCH OF SNOW WITH ONE OF THE COLD FRONTS FROM 13TH INTO
THE 14TH. BUT, THERE WAS LITTLE IF ANY SNOW ACCUMULATION.
BUT, AREAS TO THE NORTH TOWARDS CORVALLIS AND ALBANY GOT
1 TO 2 INCHES OF SNOW. AFTERWARDS, DRY AND MILDER WEATHER
SET IN FOR A TIME, WITH HIGHS WELL INTO THE 60S. BUT,
AS IT MARCH, THIS WOULD NOT LAST, AS RAIN AND COOLER
TEMPERATURES RETURNED FOR THE LAST WEEK OF MARCH.
APRIL...OVERALL, IT WAS A RATHER BENIGN WEATHER MONTH FOR THE
SOUTH WILLAMETTE VALLEY. THOUGH IT STARTED A BIT COOL
WITH SHOWERS. SHOWERS ON THE 5TH PRODUCED SMALL HAIL,
WITH A DIME-SIZED HAIL REPORTED NEAR MARCOLA. MILDER
TEMPERATURES DOMINATED THE MONTH AFTER THE 8TH, WITH
HIGHS MOSTLY 65 TO 75. LITTLE IF ANY RAIN FELL FROM THE
7TH TO THE 21ST. BUT DID SEE 0.50 TO 0.75 INCH WITH A
STRONG FRONT ON THE 22ND. BUT, APRIL ENDED WITH ABOUT
HALF THE NORMAL RAINFALL.
MAY...LIKE MAY 2019, THIS MAY WAS A MONTH FOR GARDENERS. MAY
STARTED MILD AND SOMEWHAT WET. THUNDERSTORMS ON THE 2ND
BROUGHT GUSTY WINDS, ENOUGH TO BREAK TREE BRANCHES AND
DOWNED A FEW TREES ACROSS THE REGION, WITH SPOTTY POWER
OUTAGES REPORTED FROM EUGENE EASTWARD TO LEABURG. BY THE
4TH, TEMPERATURES WARMED INTO THE 70S, AND INTO THE
LOWER 80S FOR THE MOTHERS DAY WEEKEND. AFTERWARDS, IT
WAS BACK TO UNSETTLED WEATHER, WITH RAIN AND COOLER
TEMPERATURES. ANOTHER WARM SPELL ARRIVED FOR THE 26TH
TO 29TH, WITH HIGHS WELL INTO THE 80S, WARMEST ON THE
28TH. A COLD FRONT SWEPT ACROSS REGION ON 30TH, WITH
SHOWERS AND EVEN A FEW THUNDERSTORMS.
THE STREAK OF MONTHS WITH BELOW NORMAL RAINFALL ENDS AT
7 (OCT 2019 TO APR 2020), AS MAY FINISHED WITH JUST A
TAD ABOVE NORMAL RAINFALL.
JUNE...LIKE MAY, JUNE WAS ANOTHER RATHER PLEASANT MONTH, WITH
NEAR NORMAL RAINFALL. MOST OF THE RAIN FELL FROM THE 6TH
16TH. DURING THAT TIME, SEVERAL FRONTS PUSHED ACROSS AREA
WITH ALTERNATING RAIN AND SHOWERS. THUNDERSTORMS ON THE
6TH BROUGHT SMALL HAIL IN SPOTS, ALONG WITH A WELL-DEFINED
FUNNEL CLOUD JUST SOUTHEAST OF HARRISBURG. THUNDERSTORMS
ON THE 16TH ALSO PRODUCED A FUNNEL CLOUD NEAR ALBANY.
JULY...HIGH PRESSURE OVER THE REGION MAINTAINED WARM DAYS AND
MILD NIGHTS, ALONG WITH DRY WEATHER. THE ONLY RAIN WAS
A TRACE ON THE 3RD, COMING FROM A BRIEF SPOT OF DRIZZLE.
WARMEST DAY OF JULY WAS THE 27TH, WITH HIGHS OF 98 TO 101
ACROSS THE EUGENE/SPRINGFIELD AREA.
AUGUST...HIGH PRESSURE OVER THE REGION MAINTAINED WARM DAYS AND
MILD NIGHTS, ALONG WITH DRY WEATHER. TOTAL AUGUST RAINFALL
WAS ONLY 0.05 INCH, BUT FELL ON ONLY 2 DAYS, THE 6TH AND
21ST. WARMEST DAY OF AUGUST, AND FOR THE WHOLE YEAR OF 2020
WAS ON THE 15TH, WITH A HIGH OF 101 DEG. OVERALL, IT WAS
THE 8TH WARMEST JULY/AUGUST COMBO ON RECORD.
SEPTEMBER...THE MONTH STARTED WARM AND DRY, WITH HIGHS IN 90S.
AN ABNORMALLY STRONG UPPER LOW DROPPED SOUTH FROM CANADA
INTO ROCKIES ON LABOR DAY WEEKEND, WITH SNOW IN THE ROCKIES.
STRONG HIGH PRESSURE FOLLOWED THAT LOW BROUGHT STRONG DRY
OFFSHORE FLOW TO THE PACIFIC NW. EAST TO NORTHEAST WINDS OF
15 TO 25 MPH, WITH GUSTS UP TO 35 MPH WERE FELT ACROSS THE
SOUTH WILLAMETTE VALLEY ON THE 7TH AND 8TH. WINDS BROKE
TREE BRANCHES AND CAUSED SPOTTY POWER OUTAGES.
BUT, WITH WINDS WERE MUCH STRONGER OVER THE CASCADES. THAT
DOWNED POWERLINES, SPARKING WILDFIRES WITH THE VERY DRY
CONDITIONS. THESE FIRES BURNED INTENSELY, WITH LARGE
AMOUNTS OF SMOKE LOFTED AND SPREADING OVER MUCH OF THE
REGION. AIR QUALITY PLUMMETED, WITH SMOKE COVER SKIES FROM
THE 7TH THROUGH THE 18TH. THIS SMOKE KEPT DAY TEMPERATURES
DOWN, AND OVERNIGHT LOWS MILD. IT ALSO MADE FOR MANY DAYS
OF QUITE UNHEALTHY AIR QUALITY.
STRONG THUNDERSTORMS ROLLED NORTHWARD ACROSS THE WILLAMETTE
VALLEY AND CASCADES ON THE 17TH INTO THE 18TH. THESE STORMS
PRODUCED VERY HEAVY DOWNPOURS AND GUSTY WINDS, ALONG WITH
SOME HAIL. MANY SPOTS IN AND AROUND IN AND AROUND EUGENE
PICKED UP 0.75 TO 1.25 INCHES OF RAIN WITHIN 30 MINUTES
WITH THE HEAVIER STORMS. ONE STORM THAT DEVELOPED OVER THE
COBURG HILLS PUSHED NORTH QUICKLY, BRINGING HEAVY RAIN AND
HAIL TO THE LEBANON AREA, ALONG WITH STRONG DAMAGING WINDS.
AFTERWARDS, WEATHER PATTERN CHANGED, WITH MORE ONSHORE FLOW
AND SOUTHWEST FLOW ALOFT. THIS ALLOWED SMOKE TO BE SHUNTED
BACK TO THE EAST, WITH IMPROVING AIR QUALITY. A STRONG
FRONT ARRIVED ON THE 23RD, BRINGING MORE RAIN.
OCTOBER...AFTER A MILD AND DRY START, THE TRANSITION FROM LATE
SUMMER-LIKE WEATHER TO AUTUMN BEGAN IN EARNEST BY THE 10TH.
A SERIES OF FRONTS ARRIVED, WITH A RAINY STRETCH FROM THE
10TH TO THE 13TH. THEN, IT TURNED MOSTLY DRY THROUGH REST
OF THE MONTH, WITH 0.01 INCH OF RAIN FALLING ON THE 24TH.
THIS DUE TO STRONG HIGH PRESSURE OVER THE REGION, WITH DID
BRING QUITE A BIT OF LATE NIGHT AND MORNING FOG. CHILLY
AIR SETTLED OVER REGION LATER IN THE MONTH, WITH AUTUMN`S
FIRST FREEZE ON 22ND. BUT, WAS EVEN COLDER ON THE 26TH, AS
OVERNIGHT LOWS FELL TO 23 DEG. THIS LOW OF 23 IS THE 4TH
COLDEST TEMPERATURE RECORDED IN EUGENE IN MONTH OF OCT
(DATING BACK TO 1892). ALSO, THE LOW OF 23 DEG ON THE
26TH IS THE EARLIEST IT HAS BEEN THAT COLD IN THE AUTUMN.
RUNNER UP IS OCTOBER 1949, WITH A LOW OF 24 DEG ON 20TH.
NOVEMBER...BIT WARMER AND DRIER THAN NORMALLY EXPECTED FOR A
NOVEMBER. OVERALL, WEATHER REMAINED RATHER BENIGN, WITH
RAIN AT TIMES AND MILD TEMPERATURES. STRONGEST FRONT OF
THE MONTH PUSHED ACROSS REGION ON THE 17TH AND 18TH, WITH
HEAVY RAIN AND SOUTH WINDS GUSTING UP TO 40 MPH.
THU
DECEMBER...DECEMBER STARTED ON A DRY NOTE. BUT, THEN THE RAIN
RETURNED, WITH RAIN NEARLY EVERY DAY FROM THE 5TH TO THE
22ND. AN ATMOSPHERIC RIVER PUSHED OVER THE REGION ON THE
20TH, BRINGING HEAVY RAIN. MOST AREAS IN AND AROUND EUGENE
RECEIVED 2 TO 3 INCHES OF RAIN. SMALLER STREAMS RAN FULL,
BUT MOST LOCAL RIVERS STAYED BELOW FLOOD STAGE. MILD
WEATHER CONTINUED THROUGH THE END OF THE MONTH.
=============================================================
NEW RECORDS SET IN 2020 (PREVIOUS RECORD IN PARENTHESES)
+ INDICATES MOST RECENT OF MULTIPLE OCCURRENCES
JANUARY...
3RD NEW. DAILY WARM HIGH TEMP 61 ( 60 /1994+)
23RD NEW. DAILY WARM LOW TEMP 51 ( 49 /1975 )
*** 2ND WARMEST JANUARY (MEAN TEMPERATURE 46.5 DEG)
JUNE...
20TH NEW. DAILY WARM LOW TEMP 61 ( 59 /1921 )
AUGUST...
15TH NEW. DAILY WARM HIGH TEMP 101 ( 99 /1967 )
16TH NEW. DAILY WARM LOW TEMP 64 ( 62 /2008 )
SEPTEMBER...
18TH NEW. DAILY WARM LOW TEMP 59 ( 57 /2011+)
18TH NEW. DAILY RAINFALL 1.14" (0.86"/2019 )
23RD NEW. DAILY WARM LOW TEMP 58 ( 57 /1915 )
OCTOBER...
26TH NEW. DAILY COLD LOW TEMP 23 ( 26 /1954 )
27TH TIED. DAILY COLD LOW TEMP 26 ( 26 /1948 )
NOVEMBER...
4TH TIED. DAILY WARM LOW TEMP 54 ( 54 /2012+)
9TH TIED. DAILY COLD LOW TEMP 24 ( 24 /1982+)
DECEMBER...
8TH TIED. DAILY WARM HIGH TEMP 62 ( 62 /2015+)
===============================================================
2020 EUGENE MONTHLY TEMPERATURE AND PRECIPITATION RANKINGS
THIS SHOWS WHERE A MONTH/YEAR RANKS IN PERIOD OF RECORD
(1892 TO 2020). RANKINGS ONLY APPLY TO ALL OF THE SAME MONTH,
IN OTHER WORDS, WHERE JAN 2020 COMPARES TO ALL OTHER JANUARYS.
RANKINGS 1 TO 129, WHERE 1 IS THE RECORD WARMEST OR WETTEST,
AND 129 IS THE RECORD DRIEST OR COLDEST.
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2020
AVG T 2 73 77 14 25 29 17 11 9 45 72 29 10
PRECIP 57 120 88 104 38 39 110 85 18 106 73 62 99
MAX T 4 46 56 14 34 53 25 8 30 28 42 14 7
MIN T 1 94 102 37 17 15 19 28 7 67 87 59 15
===============================================================
2020 EUGENE AIRPORT TEMPERATURE DATA
(+ BY DATE INDICATES LAST OF SEVERAL OCCURRENCES LISTED)
|--- AVERAGES ----| MEAN T DEPART| EXTREME TEMPS & DATE|
MONTH |HIGHS LOWS MEAN| FROM NORMAL | HIGHEST LOWEST |
---------------------------------------------------------------
JAN 51.9 41.2 46.5 +5.8 DEG 65 /31ST 29 /15TH
FEB 51.6 33.3 42.5 -0.4 DEG 59 /27TH 25 /19TH
MAR 55.8 35.0 45.4 -1.3 DEG 69 /22ND 28 /10TH
APR 65.1 40.8 53.0 +2.8 DEG 75 /28TH 30 / 3RD
MAY 69.4 46.0 57.7 +2.4 DEG 87 /28TH 35 / 4TH
JUN 74.2 50.3 62.3 +1.9 DEG 92 /23RD 41 / 2ND
JUL 84.8 53.3 69.1 +2.3 DEG 99 /27TH 49 /25TH
AUG 86.2 52.5 69.4 +2.5 DEG 101 /15TH 44 / 7TH
SEP 78.1 51.4 64.8 +2.9 DEG 95 / 3RD+ 44 /28TH+
OCT 66.3 42.1 54.2 +1.5 DEG 85 / 2ND 23 /26TH
NOV 54.2 36.5 45.4 +0.5 DEG 73 / 4TH 24 / 9TH
DEC 49.7 35.6 42.7 +3.0 DEG 62 / 8TH 25 /29TH
2020 65.6 43.2 54.4 +1.9 DEG 101/AUG 15 23/OCT 26
NORMAL 63.3 41.6 52.5
DAYS WITH TEMPERATURES IN 2020 WHERE...
|------ MAXIMUM TEMP --------||------ MINIMUM TEMP ---|
<=32 60+ 70+ 80+ 90+ 100+ <=20 <=32 60+ 70+
--------------------------------------------------------------
JAN 0 3 0 0 0 0 0 3 0 0
FEB 0 0 0 0 0 0 0 16 0 0
MAR 0 9 0 0 0 0 0 13 0 0
APR 0 25 8 0 0 0 0 2 0 0
MAY 0 30 14 6 0 0 0 0 0 0
JUN 0 30 22 7 2 0 0 0 1 0
JUL 0 31 30 22 10 0 0 0 1 0
AUG 0 31 31 29 6 1 0 0 4 0
SEP 0 30 25 11 4 0 0 0 1 0
OCT 0 25 11 1 0 0 0 6 0 0
NOV 0 7 1 0 0 0 0 12 0 0
DEC 0 1 0 0 0 0 0 9 0 0
2020 0 222 142 76 22 1 0 61 7 0
NORMAL 2 195 123 58 14 1 3 51 2 0
FIRST/LAST OCCURRENCES OF... IN 2020 NORMAL
LAST 32 DEG OR COLDER IN SPRING 14 APR (20 APR)
FIRST 70+ DEG OF THE YEAR 9 APR (30 MAR)
FIRST 80+ DEG OF THE YEAR 8 MAY (15 MAY)
FIRST 90+ DEG OF THE YEAR 23 JUN (25 JUN)
LAST 90+ DEG OF THE YEAR 7 SEP (11 SEP)
LAST 80+ DEG OF THE YEAR 2 OCT (29 SEP)
LAST 70+ DEG OF THE YEAR 4 NOV (21 OCT)
FIRST 32 DEG OR COLDER IN FALL 22 OCT (20 OCT)
==============================================================
2020 EUGENE AIRPORT RAINFALL DATA...
TOTAL DEPARTURE DAYS WITH AT LEAST... GREATEST IN
MONTH RAIN FM NORMAL 0.01 0.10 0.50 1.00 24HRS & DATE
--------------------------------------------------------------
JAN 6.59 -0.28 26 17 3 0 1.03 JAN 11-12
FEB 1.48 -3.95 9 6 1 0 0.90 FEB 15-16
MAR 3.00 -1.99 13 10 2 0 0.82 MAR 30-31
APR 1.46 -1.87 10 4 1 0 0.64 APR 22
MAY 2.98 +0.24 16 9 1 0 0.64 MAY 13-14
JUN 1.69 +0.19 11 5 1 0 0.73 JUN 16
JUL T -0.54 0 0 0 0 TRACE JUL 3
AUG 0.05 -0.56 2 0 0 0 0.04 AUG 6
SEP 2.75 +1.46 6 6 2 1 2.08 SEP 17-18
OCT 1.38 -1.87 5 3 1 0 0.70 OCT 10-11
NOV 5.47 -2.25 19 12 4 2 1.29 NOV 18-19
DEC 6.45 -1.38 20 11 5 1 2.51 DEC 19-20
2020 33.30 -12.80 137 83 21 4 2.51 DEC 19-20
NORMAL 46.10 144 93 30 10
EUGENE WATER YEAR 2019-20 (1 OCT 2019 THROUGH 30 SEP 2020)
27.81 INCHES 18.29 INCHES BELOW NORMAL
TOTAL SNOWFALL FOR 2020... TRACE (NORMAL: 6.0")
============================================================
2020 EUGENE AIRPORT WIND AND PRESSURE DATA...
AVERAGE SPEED (MPH) STRONGEST WIND GUST
MONTH 2020 NORMAL DIRECTION SPEED DATE
----------------------------------------------------------
JAN 9.2 (6.8) SOUTHWEST 47 MPH JAN 15
FEB 6.0 (7.1) SOUTHWEST 32 MPH FEB 29
MAR 6.7 (7.4) NORTH 33 MPH MAR 16
APR 6.0 (7.1) SOUTH 31 MPH APR 5
MAY 6.3 (6.6) WEST 37 MPH MAY 2
JUN 6.5 (7.0) SOUTHWEST 32 MPH JUN 6
JUL 6.3 (7.5) NORTH 32 MPH JUL 14+
AUG 7.6 (7.1) NORTH 32 MPH AUG 27
SEP 6.0 (6.8) SOUTHWEST 43 MPH SEP 23
OCT 5.8 (6.4) NORTH 35 MPH OCT 25
NOV 6.6 (7.0) SOUTH 38 MPH NOV 17
DEC 6.4 (7.1) SOUTHWEST 37 MPH DEC 21
2020 6.7 (7.0) SOUTHWEST 47 MPH JAN 15
2020 BAROMETRIC PRESSURE EXTREMES...
HIGHEST PRESSURE30.66 INCHES 24 FEB
LOWEST PRESSURE 29.43 INCHES 17 NOV
==============================================================
2020 MAJOR RIVER EXTREMES
WILLAMETE RIVER (NEAR EWEB BUILDING, DOWNTOWN EUGENE)...
HIGHEST 16.5 FT 29 JAN (FLOOD STAGE IS 23.0 FT)
LOWEST 9.5 FT 5 NOV
WILLAMETE RIVER (AT HARRISBURG)...
HIGHEST 12.0 FT 21 DEC (FLOOD STAGE IS 14.0 FT)
LOWEST 2.1 FT 5 NOV
MOHAWK RIVER (AT HILL RD, NORTH OF SPRINGFIELD)...
HIGHEST 13.3 FT 21 DEC (FLOOD STAGE IS 15.0 FT)
LOWEST 0.8 FT 8 SEP
=============================================================
EUGENE AIRPORT CLIMATE PERIOD OF RECORDS... 1892 TO 2020
EUGENE AIRPORT CLIMATE NORMALS BASED ON... 1981 TO 2010
=============================================================
DATA COMPILED BY ROCKEY
NATIONAL WEATHER SERVICE PORTLAND OREGON
ONLINE AT: WEATHER.GOV/PORTLAND
$$
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