Wednesday, May 6, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 6, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

MILD AND COOL WITH OVERCAST CONDITIONS IN
THE AFTERNOON….

Today has been mostly cloudy, with a great 75 miles
of visibility. Skies became overcast with a layer
of stratus clouds as the day went on. Wind was
northeasterly, with a constant speed around 10 mph.
The max gust so far today is 22 mph.

The high so far today is 54F, this is 10 degrees
below our daily normal high temperature of 64F. The
low since midnight is 38F, which is 7 degrees below
the daily normal low of 45F.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrus
Temperature: 47F; Dew Point: 36F; Relative Humidity: 65%
Wind: NE at 7 kts
Sea-level pressure: 29.94 ins. Hg: rising, then steady
Visibility: 75 miles
6-hr Max temp: 47F
6-hr Min temp: 38F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 130 SCT E250 BKN 75 139/47/36/0507/994/ 8/072 53004
10047 20038

10 A.M.
Weather: Scattered altocumulus
Temperature: 52F; Dew Point: 35F; Relative Humidity: 52%
Wind: NE at 10 kts
Sea-level pressure: 29.91 ins. Hg: falling steadily
Visibility: 75 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E130 BKN 75 131/52/35/0610/991/ FEW CU ALQDS/ 8/170
58008

1 P.M.
Weather: Scattered cumulus, broken cirrus and altocumulus
Temperature: 54F; Dew Point: 33F; Relative Humidity: 44%
Wind: NE at 11G17 kts
Sea-level pressure: 29.89 ins. Hg: falling steadily
Visibility: 75 miles
6-hr Max temp: 54F
6-hr Min temp: 47F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 40 SCT E130 BKN 250 BKN 75 123/54/33/0511G17/989/
8/172 58008 10054 20047

SUMMARY FOR TUESDAY, MAY 5, 2020

TEMPERATURE (DEGREES F)
MAX…..60   NORMAL…..63
MIN…..40   NORMAL…..45
MEAN….50   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL……………… -4
TOTAL DEPARTURE FOR THE MONTH………………+23 [+4.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………15  DEPARTURE……. +4
TOTAL HEATING UNITS FOR THE MONTH……………37  DEPARTURE…….-23
TOTAL HEATING UNITS FOR THE SEASON…………5558  DEPARTURE……-537
TOTAL HEATING UNITS LAST SEASON TO DATE…….5983  DEPARTURE……-425

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE…….. 0
TOTAL HEATING UNITS FOR THE MONTH…………….2  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE SEASON……………2  DEPARTURE……..-1
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE……..+2

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..31 NW  AT  7:00 A.M.
AERO…………………….32 NW  AT  6:43 A.M.
ASOS…………………….31 NW  AT  7:12 A.M.
DAVIS……………………32 NW  AT  6:49 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….24 NW  AT  7:40 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 NW  AT  7:40 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………24 NW  AT  7:41 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….12.7 NW
ASOS…………………….12.7
DAVIS……………………12.9 NW [317 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.94  DEPARTURE……+0.32
ASOS…………..0.96
TOTAL PRECIPITATION FOR THE YEAR……….17.97  DEPARTURE……-1.20
ASOS………….18.60

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE SEASON…………..31.9  DEPARTURE……-30.8

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

04/01  42/28/35/-6/0.00/0.0/008/01         28 NE  AERO 28 NE  RMY 30
04/02  46/35/41/0/…/0.0/000/00           39 NW  AER0 40 NW  RMY 41
04/03  42/38/40/-2/…./0.0/000/00         48 NE  AERO 53 NE  RMY 49
04/04  46/36/41/-1/…./0.0/278/36         38 NE  AERO 38 NE  RMY N/A
04/05  55/36/46/+3/T/0.0/039/05            22 S   AERO 21 S   RMY 21
04/06  61/40/51/+8/0.00/0.0/732/94         29 NW  AERO 30 NW  RMY 29
04/07  63/42/53/+10/0.00/0.0/649/83        29 W   AERO 30 W   RMY 28
04/08  50/41/46/+2/…./…/047/06         23 S   AERO 22 S   RMY 22
04/09  47/37/42/-2/…./…/000/00         58 W   AERO 58 W   RMY 56
04/10  47/35/41/-4/0.02/T/324/41           48 W   AERO 50 W   RMY 53
04/11  51/33/42/-3/0.00/0.0/730/92         38 WNW AERO 39 WNW RMY 40
04/12  60/33/47/+2/0.00/0.0/326/41         38 S   AERO 40 S   RMY N/A
04/13  59/50/55/+9/1.42/0.0/000/00         79 S   AERO 83 S   RMY 78
04/14  57/41/49/+3/0.00/0.0/641/80         41 W   AERO 40 W   RMY N/A
04/15  52/36/44/-3/0.02/0.0/450/56         37 W   AERO 36 W   RMY 37
04/16  47/32/40/-7/T/T/379/47              33 WNW AERO 33 WNW RMY 32
04/17  49/29/39/-8/…./0.0/591/73         41 W   AERO 39 W   RMY 41
04/18  37/31/34/-14/…./4.3/000/00        29 NE  AERO 25 NE  RMY 25
04/19  60/31/46/-2/0.00/0.0/693/85         40 SSW AERO 40 SSW RMY 41
04/20  49/37/43/-6/0.00/0.0/…/..         25 ENE AERO 22 W   RMY N/A
04/21  53/33/43/-6/…./…/…/..         52 S   AERO 52 S   RMY 52
04/22  43/30/37/-12/0.00/0.0/…/..        51 W   AERO 50 W   RMY 50
04/23  55/29/42/-8/0.00/0.0/…/..         31 W   AERO 29 W   RMY N/A
04/24  42/37/40/-10/…./…/…/..        31 NNE AERO 29 NNE RMY 29
04/25  60/38/49/-1/0.00/0.0/…/..         25 S   AERO 24 S   RMY 24
04/26  51/38/45/-6/…./0.0/…/..         51 NE  AERO 50 NE  RMY 50
04/27  39/35/37/-14/…./T/…/..          54 NE  AERO 52 NNE RMY 55
04/28  48/35/42/-10/…./…/…/..        28 N   AERO 27 N   RMY N/A
04/29  55/35/45/-7/0.00/0.0/…/..         24 ENE AERO 23 ENE RMY 22
04/30  52/42/47/-5/…/0.0/…/..          36 SE  AERO 32 SE  RMY N/A

DAILY RECORDS FOR APRIL 2020

4/13/2020
NEW PEAK GUST OF 79 MPH S, REPLACING THE OLD
RECORD OF 59 MPH SSW IN 1995

4/18/2020
NEW RECORD SNOWFALL OF 4.3 INS, REPLACING THE OLD
RECORD OF 3.7 INS IN 1965

4/27/2020
NEW RECORD LOW MAX TEMPERATURE OF 39F, REPLACING
THE OLD RECORD OF 40F IN 1917

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

05/01  64/52/58/+5/…./0.0/…/..         46 SSE  AERO 44 SSE RMY N/A
05/02  70/42/56/+3/…./0.0/…/..         41 NW   AERO 40 NW  RMY N/A
05/03  78/55/67/+14/0.00/0.0/…/..        35 SSW  AERO 35 SSW RMY 36
05/04  72/45/59/+5/T/0.0/…/..            37 NW   AERO 40 WNW RMY 39
05/05  60/40/50/-4/0.00/0.0/…/..         31 NW   AERO 32 NW  RMY N/A

05/06 The low since midnight is 38F, the daily normal low is 45F

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

RECORDS FOR MAY 6
HIGH 90F IN 1930
LOW 29F IN 1891
PRECIP 1.04 INCHES IN 1890
SNOWFALL TRACE IN 1917,1996
PEAK GUST 65 MPH SSE IN 1989

RECORDS FOR MAY 7
HIGH 93F IN 1930
LOW 33F IN 1970
PRECIP 1.19 INCHES IN 2005
SNOWFALL TRACE IN 1967
PEAK GUST 66e MPH WNW IN 1940

TODAY’S REPORT PREPARED BY: Benjamin Turner