Tuesday, September 8, 2020

| September 8, 2020 | Reply

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

TUESDAY, SEPTEMBER 8, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM AND MORE HUMID UNDER MOSTLY SUNNY SKIES….

Warm air continues over the region today with temperatures
reaching the low to mid 80s. The biggest change over
yesterday is the increase in humidity. Dew point readings
have been in the low to mid 60s all day, definitely more
noticeable after the spectacular weather over the holiday
weekend.

Plenty of sunshine has been the theme today after some
early morning clouds and fog burned off.

Wind has been a non-story today with an average since
7 A.M. of only around 5 mph. The peak gust has only been
about 15 mph.

We could really use some rainfall as our precipitation
deficit starts to mount. The departure for the year
is getting close to 3 inches again, sitting at -2.82
inches as of this morning.

The high so far today is 81F, 7 degrees above the daily
normal max of 74F. The low since midnight is 61F, which is
4 degrees above the normal low of 57F.

PRELIMINARY STATS FOR AUGUST 2020

TEMPERATURE, Deg. F
Avg. Max. 82.5 [+3.3]
Avg. Min. 64.3 [+2.5]
Mean      73.4 [+2.9]
24-hour corrected mean: 72.3
Max. for month: 94F on the 10th
Min. for month: 54F on the 31st

HEATING DEGREE DAYS
Total heating units:     2 [-14]
Total for the season:    3 [-22]
Total for last season:  12

COOLING DEGREE DAYS
Total cooling units:    270  [+84]
Total for the season:   757  [+220]
Total for last season:  622

PRECIPITATION, Inches
Total: 3.74 [-0.29]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 10.0 mph
Avg. corrected wind speed:   10.6 mph
Prevailing wind direction:   SSW [12%]
Peak gust and direction:     67 SSE on the 4th

SUNSHINE:
Campbell-Stokes card minutes: 15366 minutes of a possible 24780 or 62%
Astronomical total minutes: 15940 minutes of a possible 25709 or 62%

Today’s Observations:

7 A.M.
Weather: Vertical visibility 200 feet, sky obscured
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: SSW at 6 kts, wind light
Sea-level pressure: 30.17 ins. Hg: rising, then more rapidly
Visibility: 1/4 mile, fog
6-hr Max temp: 63F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.
BHO SA 1155 W2 X 1/4F 218/63/63/2106/017/ SUN OCLY DMLY VSBL
WND LGT/ 8//// 53019 10063 20061

10 A.M.
Weather: Scattered stratocumulus, thin broken cirrus,
fog bank offshore NE-ENE
Temperature: 74F; Dew Point: 64F; Relative Humidity: 71%
Wind: SW at 5 kts, wind light
Sea-level pressure: 30.14 ins. Hg: rising then falling
Visibility: 40 miles, 20 miles NE-ENE
3-hr Precip: 0.00 ins.
BHO SA 1455 20 SCT 250 -BKN 40 208/74/64/2205/014/ F BNK OFFSHR
NE-ENE VSBY NE-ENE 20 WND LGT/ 8/501 53010

1 P.M.
Weather: Thin broken cirrus, few cumulus distant all quadrants
Temperature: 80F; Dew Point: 63F; Relative Humidity: 57%
Wind: S at 5 kts, wind light and variable
Sea-level pressure: 30.13 ins. Hg: rising, then falling
Visibility: 50 miles
6-hr Max temp: 81F
6-hr Min temp: 63F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 -BKN 50 204/80/63/1705/013/ FEW CU DSNT ALQDS
WND L/V/ 8/201 58004 10081 20063

SUMMARY FOR MONDAY, SEPTEMBER 7, 2020

TEMPERATURE (DEGREES F)
MAX…..79   NORMAL…..75
MIN…..61   NORMAL…..58
MEAN….70   NORMAL…..66

DEPARTURE FROM 30-YEAR NORMAL……………. +4
TOTAL DEPARTURE FOR THE MONTH……………. +9 [+1.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………  5  DEPARTURE……+2
TOTAL COOLING UNITS FOR THE MONTH………… 25  DEPARTURE……+1
TOTAL COOLING UNITS FOR THE SEASON………..782  DEPARTURE….+221
TOTAL COOLING UNITS LAST SEASON TO DATE……634  DEPARTURE….+148

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..27 SSE AT  1:16 P.M.
AERO…………………….30 SSE AT  2:11 P.M.
ASOS…………………….27 S   AT  3:09 P.M.
DAVIS……………………28 S   AT  9:14 A.M.
RMY 28  MERLIN 28
FASTEST MILE FOR YESTERDAY………………….20 S   AT  3:08 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 S   AT  3:07 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 SSE AT  1:00 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.5 S
ASOS…………………..12.7
DAVIS………………….11.6 S [184 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE….-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.22  DEPARTURE….-0.61
ASOS…………..0.24
TOTAL PRECIPITATION FOR THE YEAR……….33.03  DEPARTURE….-2.82
ASOS………….33.82

PRELIMINARY CLIMATE SUMMARY FOR AUGUST CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

08/01  87/66/77/+5/0.00/866/100            18 S    AERO 21 S    RMY 19
08/02  85/69/77/+5/0.02/320/37             36 S    AERO 37 S    RMY 38
08/03  91/75/83/+11/0.00/715/83            36 WSW  AERO 38 SW   RMY 36
08/04  83/71/77/5/0.21/094/11              67 SSE  AERO 71 S    RMY 70
08/05  90/68/79/+7/0.00/668/78             28 SW   AERO 30 SW   RMY 29
08/06  84/65/75/3/0.00/701/82   20 W    AERO 17 W    RMY 19
08/07  79/65/72/0/T/136/16                 16 NE   AERO 16 NE   RMY N/A
08/08  83/64/74/+2/0.00/612/72             20 S    AERO 20 S    RMY 19
08/09  90/65/78/+6/0.00/661/78             26 SSW  AERO 26 SSW  RMY 26
08/10  94/69/82/+11/0.00/727/86            22 W    AERO 20 W    RMY 20
08/11  92/72/82/+11/0.00/708/84            31 SSW  AERO 35 SSW  RMY 31  TSTM
08/12  93/74/84/+13/0.00/647/77            22 SSW  AERO 22 SW   RMY 19
08/13  88/71/80/+9/0.00/528/63             18 ENE  AERO 18 NE   RMY 18
08/14  82/67/75/+4/0.00/618/74             23 ENE  AERO 23 ENE RMY N/A
08/15  67/62/65/-6/T/000/00                33 NNE  AERO 32 NNE  RMY N/A
08/16  69/62/66/-5/…./000/00             26 ENE  AERO 28 ENE  RMY 26
08/17  73/59/66/-5/…./339/41             25 NE   AERO 24 NE   RMY N/A
08/18  84/63/74/+3/…./784/95             23 W    AERO 23 W    RMY 24
08/19  81/59/70/0/0.03/526/64              26 W    AERO 28 W    RMY 27
08/20  80/56/68/-2/0.00/804/98             22 W    AERO 21 W    RMY 22
08/21  88/61/75/+5/0.00/719/88             28 SW   AERO 26 SW   RMY 28
08/22  85/66/76/+6/0.26/521/64             18 NNE  AERO 16 S    RMY 16
08/23  89/63/76/+6/2.21/552/68             60 WNW  AERO 53 WNW  RMY 58  TSTM HAIL
08/24  87/67/77/+7/0.00/493/61             18 S    AERO 18 S    RMY 19  TSTM
08/25  86/65/76/+7/0.01/492/61             35 NNW  AERO 37 NNW  RMY 35
08/26  74/56/65/-4/0.00/780/97             29 NW   AERO 32 NW   RMY N/A
08/27  68/57/63/-6/0.33/008/01             18 SSE  AERO 20 SSE  RMY 20  TSTM
08/28  80/59/70/+1/0.00/559/70             20 W    AERO 20 W    RMY N/A
08/29  74/65/70/+1/0.06/000/00             32 W    AERO 32 W    RMY N/A
08/30  75/57/66/-2/0.00/793/100            36 W    AERO 36 W    RMY N/A
08/31  75/54/65/-3/0.00/569/72             20 S    AERO 20 S    RMY 20

DAILY RECORDS FOR AUGUST 2020

8/23/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 89F,
BREAKS PREVIOUS RECORD of 88F SET IN 1918, 1947, 1949, 1996

8/23/20: DAILY RECORD PRECIPITATION OF 2.21 INS,
BREAKS PREVIOUS RECORD OF 2.09 INS SET IN 2010

8/23/20: DAILY RECORD PEAK WIND GUST OF 60 MPH,
TIES PREVIOUS RECORD OF 60 MPH SET IN 1940

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

09/01  76/59/68/0/0.00/…/..              22 SSE  AERO 21 SE   RMY 20
09/02  69/59/64/-4/…/…/..              23 SSE  AERO 23 SSE  RMY 24
09/03  75/66/71/+4/…/…/..              22 SSW  AERO 21 SSW  RMY n/a
09/04  82/62/72/+5/0.00/…/..             26 WNW  AERO 26 WNW  RMY 25
09/05  76/55/66/-1/0.00/…/..             25 W    AERO 25 W    RMY 24
09/06  78/58/68/+1/0.00/…/..             24 W    AERO 24 W    RMY N/A
09/07  79/61/70/+4/0.00/…/..             27 SSE  AERO 30 SSE  RMY 28

09/08 The low since midnight is 61F, the daily normal low is 57F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR SEPTEMBER 8
HIGH 97F IN 2015
LOW 42F IN 1978
PRECIP 1.51 INCHES IN 2011
PEAK GUST 45 MPH S IN 2012

RECORDS FOR SEPTEMBER 9
HIGH 92F IN 2015
LOW 41F IN 1938
PRECIP 1.97 INCHES IN 1969
PEAK GUST 52 MPH WNW IN 1969, NW IN 1978

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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