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

TUESDAY, SEPTEMBER 22, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY, COOL, AND BREEZY DAY AT BLUE HILL....

As hurricane Teddy transitions to an extratropical
storm to the east of New England today, a brisk north
to northwesterly wind has been the theme along with
increasing amounts of mainly high clouds. Unfortunately,
the storm system isn't getting close enough to bring
any much needed rainfall.

Thanks to all the cloud cover, the temperature has been
held only in the low 60s here at Blue Hill, this is
still below normal for the date. As a matter of fact 
we had our first sub 40 degree temperature of the season
this morning with a low of 39 degrees occurring at around
5 A.M.

After yesterday's rather high pressure reading, today 
the pressure has been taking a nosedive as the storm
system makes its closest pass to the region this afternoon.
The pressure between 10 A.M. and 1 P.M. dropped an
impressive 5.0 millibars, that's about .15 in/hg! 

Despite the cloud cover, the visibility has remained 
excellent today averaging 70-80 miles! 

It has been 11 days since we've recorded any measurable
rainfall (0.01" on the 11th). Only 0.51" has fallen for
the month to date, which is 2.23 inches below normal. 
For the year, our deficit is running 4.44 inches below
normal. The region continues to be generally in a 
moderate drought, however severe drought conditions are
being observed across portions of south coastal
Massachusetts and Rhode Island. 

The high so far today is 61F, 8 degrees below the daily
normal max of 69F. The low since midnight is 39F, which
is 13 degrees below the normal low of 52F.


Today's Observations:

7 A.M.
Weather: Broken cirrostratus, thin smoke layer along 
horizon all quadrants, thin smoke layer aloft visible
distant SW-NW
Temperature: 42F; Dew Point: 33F; Relative Humidity: 70%
Wind: NNW at 10 kts 
Sea-level pressure: 30.16 ins. Hg: falling, then more slowly
Visibility: 80 miles 
6-hr Max temp: 44F
6-hr Min temp: 39F
24-hr Precip: 0.00 ins.
BHO SA 1155 E250 BKN 80 212/42/33/3410/016/ THN K LYR ALNG
HRZN ALQDS THN K LYR ALF VSBL DSNT SW-NW/ 8/006 56018
10044 20039

10 A.M.
Weather: Broken cirrostratus, overcast cirrus, breaks in 
overcast WSW-NW, sun dimly visible
Temperature: 56F; Dew Point: 33F; Relative Humidity: 41%
Wind: NNW at 8G13 kts
Sea-level pressure: 30.08 ins. Hg: falling, then more rapidly
Visibility: 70 miles 
3-hr Precip: 0.00 ins.
BHO SA 1455 E200 BKN 250 OVC 70 185/56/33/3408G13/008/ BINOVC DSNT
WSW-NW SUN DMLY VSBL/ 8/006 58027

1 P.M.
Weather: Broken cirrostratus, overcast cirrus, few thin spots
in overcast all quadrants, sun dimly visible
Temperature: 61F; Dew Point: 31F; Relative Humidity: 31%
Wind: N at 13G20 kts
Sea-level pressure: 29.93 ins. Hg: falling rapidly
Visibility: 70 miles
6-hr Max temp: 61F
6-hr Min temp: 42F
6-hr Precip: 0.00 ins.
BHO SA 1755 E200 BKN 250 OVC 70 135/61/31/3513G20/993/ FEW THN SPTS
INOVC ALQDS SUN DMLY VSBL PRESFR/ 8/007 58050 10061 20042


SUMMARY FOR MONDAY, SEPTEMBER 21, 2020 

TEMPERATURE (DEGREES F)
MAX.....61   NORMAL.....70
MIN.....41   NORMAL.....53
MEAN....51   NORMAL.....61

DEPARTURE FROM 30-YEAR NORMAL................-10
TOTAL DEPARTURE FOR THE MONTH................-26 [-1.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............14  DEPARTURE..... +9
TOTAL HEATING UNITS FOR THE MONTH.............79  DEPARTURE.....+22
TOTAL HEATING UNITS FOR THE SEASON............82  DEPARTURE.....  0
TOTAL HEATING UNITS LAST SEASON TO DATE.......76  DEPARTURE..... +6

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY............  0  DEPARTURE......-1                   
TOTAL COOLING UNITS FOR THE MONTH............ 50  DEPARTURE..... -2
TOTAL COOLING UNITS FOR THE SEASON...........807  DEPARTURE....+218
TOTAL COOLING UNITS LAST SEASON TO DATE......654  DEPARTURE....+153

PEAK WIND GUST FOR YESTERDAY (MPH) 
                   420C/Official................29 NE  AT 10:48 A.M.  
                   AERO.........................27 NE  AT 10:34 A.M. 
                   ASOS.........................30 NE  AT 10:49 A.M.
                   DAVIS........................29 NE  AT 10:48 A.M.
                   RMY 29  MERLIN 27
FASTEST MILE FOR YESTERDAY......................19 NE  AT  9:57 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................18 ENE AT 11:28 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................19 NE  AT 10:50 A.M.
AVERAGE WIND SPEED AND DIRECTION..............10.8 N (258 total miles)        
                   ASOS.......................11.2
                   DAVIS......................11.2 NE [036 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE....-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.51  DEPARTURE....-2.23
                         ASOS..............0.51
TOTAL PRECIPITATION FOR THE YEAR..........33.32  DEPARTURE....-4.44
                         ASOS.............34.09

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  76/59/68/0/0.00/698/88              22 SSE  AERO 21 SE   RMY 20
09/02  69/59/64/-4/0.18/102/13             23 SSE  AERO 23 SSE  RMY 24
09/03  75/66/71/+4/0.04/000/00             22 SSW  AERO 21 SSW  RMY N/A
09/04  82/62/72/+5/0.00/763/98             26 WNW  AERO 26 WNW  RMY 25
09/05  76/55/66/-1/0.00/760/98             25 W    AERO 25 W    RMY 24
09/06  78/58/68/+1/0.00/356/46             24 W    AERO 24 W    RMY N/A
09/07  79/61/70/+4/0.00/632/82             27 SSE  AERO 30 SSE  RMY 28
09/08  82/61/72/+6/0.00/545/71             17 S    AERO 16 S    RMY 17
09/09  80/62/71/+5/0.00/214/28             16 S    AERO 15 S    RMY 16
09/10  81/69/75/+10/0.28/015/02            21 SSW  AERO 21 SSW  RMY N/A
09/11  72/55/64/-1/0.01/152/20             25 N    AERO 25 N    RMY N/A
09/12  68/51/60/-5/0.00/666/88             21 ENE  AERO 21 ENE  RMY 21
09/13  74/53/64/0/0.00/611/81              26 SSW  AERO 26 SSW  RMY 26
09/14  74/50/62/-2/0.00/511/68             29 NNW  AERO 33 NNW  RMY 30
09/15  64/44/54/-10/0.00/.../..            18 S    AERO 18 S    RMY N/A
09/16  72/49/61/-2/0.00/.../..             31 SSW  AERO 31 SSW  RMY 31
09/17  76/57/67/+4/0.00/.../..             26 WSW  AERO 28 W    RMY N/A
09/18  64/48/56/-6/0.00/.../..             28 NE   AERO 30 NNW  RMY N/A
09/19  59/42/51/-11/0.00/.../..            23 N    AERO 23 N    RMY N/A
09/20  58/40/49/-13/0.00/.../..            25 NE   AERO 25 NE   RMY 27
09/21  61/41/51/-10/0.00/.../..            29 NE   AERO 27 NE   RMY 29

09/22 The low since midnight is 39F, the daily normal low is 52F


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

RECORDS FOR SEPTEMBER 22
HIGH 90F IN 1895, 1914
LOW 30F IN 1904 (Earliest freeze)
PRECIP 1.16 INCHES IN 2001
PEAK GUST 60 MPH SSW IN 1989

RECORDS FOR SEPTEMBER 23
HIGH 93F IN 1895,1914
LOW 33F IN 1904
PRECIP 2.67 INCHES IN 1994
PEAK GUST 62 MPH SSW IN 1989

TODAY'S REPORT PREPARED BY: Matt Douglas