Sunday, October 4, 2020

| October 4, 2020 | Reply

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

SUNDAY, OCTOBER 4, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

FALL-LIKE AND DRY WITH A LIGHT, YET COOL
NORTHWESTERLY WIND….

Today we observed an excellent visibility of 80 miles on
average under partly cloudy skies. Conditions are dry,
with dew points in the upper 30’s, and a humidity of 31%
by the 1 P.M. observation. Wind was northwesterly, being
calm in the afternoon hours. The max gust so far today is
only 13 mph.

The drought monitor was updated on Thursday revealing yet
another escalation. 55% of MA now in a “severe drought”
and 29% considered in an “extreme drought” (approximately
Boston to Providence and points south and east).

-Drought section written by Andrew Swanson

The high so far today is 65F, the same as the daily normal.
The low since midnight is 45F, which is 3 degrees below the
normal low of 48F.

PRELIMINARY STATS FOR SEPTEMBER 2020

TEMPERATURE, Deg. F
Avg. Max. 73.2 [+1.6]
Avg. Min. 54.9 [+0.3]
Mean      64.1 [+1.0]
24-hour corrected mean: 63.6
Max. for month: 82F on the 8th
Min. for month: 39F on the 22nd

HEATING DEGREE DAYS
Total heating units:    95 [-22]
Total for the season:   98 [-44]
Total for last season:  93

COOLING DEGREE DAYS
Total cooling units:     73  [+13]
Total for the season:   830  [+233]
Total for last season:  680

PRECIPITATION, Inches
Total: 1.61 [-2.45]
Greatest in 24 hrs: 1.02 ins. on 29th-30th

WIND, mph
Avg. uncorrected wind speed: 10.6 mph
Avg. corrected wind speed:   11.1 mph
Prevailing wind direction:   S [20%]
Peak gust and direction:     71 S on the 30th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Scattered cirrus, few distant cumulus offshore
Temperature: 47F; Dew Point: 38F; Relative Humidity: 71%
Wind: NNW at 6 kts, wind light
Sea-level pressure: 30.31 ins. Hg: steady, then rising
Visibility: 80 miles
6-hr Max temp: 48F
6-hr Min temp: 45F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 80 263/47/38/3306/031/ FEW CU DSNT
OFFSHR WND LGT/ 8/102 51012 10048 20045

10 A.M.
Weather: Scattered altocumulus, broken cirrus, few
cumulus NE-S
Temperature: 59F; Dew Point: 38F; Relative Humidity: 46%
Wind: NW at 3 kts (wind light and variable)
Sea-level pressure: 30.32 ins. Hg: falling, then rising
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 150 SCT 250 BKN 80 267/59/38/3103/032/ FEW CU
NE-S WND L/V/ 8/152 51004

1 P.M.
Weather: Scattered cumulus, altocumulus, and cirrostratus
Temperature: 64F; Dew Point: 33F; Relative Humidity: 31%
Wind: NW at 3 kts, light and variable
Sea-level pressure: 30.26 ins. Hg: rising, then falling
Visibility: 80 miles
6-hr Max temp: 65F
6-hr Min temp: 47F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 150 SCT 250 SCT 80 248/64/33/3103/026/
WND L/V/ 8/158 58019 10065 20047

SUMMARY FOR SATURDAY, OCTOBER 3, 2020

TEMPERATURE (DEGREES F)
MAX…..65   NORMAL…..65
MIN…..45   NORMAL…..48
MEAN….55   NORMAL…..56

DEPARTURE FROM 30-YEAR NORMAL……………..-1
TOTAL DEPARTURE FOR THE MONTH……………..+7 [+2.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………. 9  DEPARTURE….. +1
TOTAL HEATING UNITS FOR THE MONTH………….19  DEPARTURE….. -7
TOTAL HEATING UNITS FOR THE SEASON………..117  DEPARTURE…..-52
TOTAL HEATING UNITS LAST SEASON TO DATE……117  DEPARTURE…….0

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………. 0  DEPARTURE…… 0
TOTAL COOLING UNITS FOR THE MONTH…………. 1  DEPARTURE…..  0
TOTAL COOLING UNITS FOR THE SEASON………..831  DEPARTURE….+233
TOTAL COOLING UNITS LAST SEASON TO DATE……680  DEPARTURE….+151

PEAK WIND GUST FOR YESTERDAY (MPH)
420C/Official…………….19 WNW AT  3:43 P.M.
AERO…………………….19 WNW AT  2:39 P.M.
ASOS…………………….19 W   AT  3:43 P.M.
DAVIS……………………19 WNW AT  2:51 P.M.
RMY 19  MERLIN 18
FASTEST MILE FOR YESTERDAY………………….15 WNW AT  2:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 W   AT  3:43 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 W   AT  2:52 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.8 NW (162 total miles)
ASOS…………………..7.7
DAVIS………………….7.3 NW [310 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE….-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.02  DEPARTURE….-0.43
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE YEAR……….34.45  DEPARTURE….-5.08
ASOS………….35.23

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/-10/0.00/583/78            18 S    AERO 18 S    RMY N/A
09/16  72/49/61/-2/0.00/603/81             31 SSW  AERO 31 SSW  RMY 31
09/17  76/57/67/+4/0.00/453/61             26 WSW  AERO 28 W    RMY N/A
09/18  64/48/56/-6/0.00/163/22             28 NE   AERO 30 NNW  RMY N/A
09/19  59/42/51/-11/0.00/722/98            23 N    AERO 23 N    RMY N/A
09/20  58/40/49/-13/0.00/602/82            25 NE   AERO 25 NE   RMY 27
09/21  61/41/51/-10/0.00/…/..            29 NE   AERO 27 NE   RMY 29
09/22  63/39/51/-10/0.00/…/..            28 NNW  AERO 30 NNW  RMY 29
09/23  78/50/64/+4/0.00/…/..             31 NW   AERO 32 WNW  RMY 32
09/24  76/57/67/+7/0.00/…/..             20 SW   AERO 18 WSW  RMY 19
09/25  77/57/67/+7/0.00/…/..             18 ENE  AERO 18 WSW  RMY N/A
09/26  77/57/67/+8/0.00/…/..             21 S    AERO 21 S    RMY 21
09/27  79/64/72/+13/0.01/…/..            24 S    AERO 25 S    RMY 24
09/28  78/64/71/+13/0.07/…/..            24 SSE  AERO 24 S    RMY 25
09/29  76/62/69/+11/0.01/…/..            30 S    AERO 30 S    RMY N/A
09/30  72/56/64/+6/1.01/…/..             71 S    AERO 88 S    RMY N/A

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/01  75/56/66/+9/0.00/…/..             28 SW   AERO 28 SW   RMY N/A
10/02  63/49/56/-1/0.02/…/..             20 NW   AERO 21 NW   RMY 20
10/03  65/45/55/-1/0.00/…/..             19 WNW  AERO 19 WNW  RMY 19

10/04 The low since midnight is 45F, the daily normal low is 47F

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

RECORDS FOR OCTOBER 4
HIGH 84F IN 2007
LOW 28F IN 1888
PRECIP 1.87 INCHES IN 2011
PEAK GUST 59 MPH SSW IN 1990

RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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