Saturday, May 2, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, MAY 2, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A FAIR WEATHER DAY WITH EXCELLENT VISIBILITY
AND MILD TEMPERATURES….

Rain amounted to 0.24 inches since the 7 A.M.
observation, making the rain total for the
event yesterday 0.94 inches. Today was quite
a contrast to the rainy day yesterday, with
80 miles of visibility on average and partly
cloudy conditions at most. Wind is northwesterly,
with a max gust so far today of 41 mph this
morning. Since then, wind has decreased after
noontime; to 10 mph on average.

Speaking of temperatures, as we wrap up the
month of April, it will go down in the books
as the first month since February 2015 with
at least 23 days below average. April 2020
will also be known for recording 16 consecutive
days of below average temps. The last time
this occurred was also in February 2015.
Precipitation? This April was good for the 7th
wettest dating back to 1885.

Temperature section written by:
Andrew Swanson

The high so far today is 66F, this is 4 degrees
above our daily normal high temperature of 62F.
The low since midnight is 42F, which is a degree
above the daily normal low of 43F.

Today’s Observations:

7 A.M.
Weather: Few cumulus
Temperature: 46F; Dew Point: 33F; Relative Humidity: 59%
Wind: NW at 14G24 kts
Sea-level pressure: 29.87 ins. Hg: rising steadily
Visibility: 80 miles
6-hr Max temp: 52F
6-hr Min temp: 42F
24-hr Precip: 0.24 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 CLR 80 115/46/33/3214G24/987/ FEW CU ALQDS/
8/100 70024 51026 10052 20042

10 A.M.
Weather: Few altocumulus
Temperature: 57F; Dew Point: 34F; Relative Humidity: 42%
Wind: WNW at 16G25 kts, peak of 32 MPH at 9:32 A.M.
Sea-level pressure: 29.90 ins. Hg: rising steadily
Visibility: 85 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 85 125/57/34/3016G25/990/ FEW AC ALQDS PK
WND 3128/32/ 8/060 51010

1 P.M.
Weather: Scattered cirrostratus
Temperature: 66F; Dew Point: 31F; Relative Humidity: 27%
Wind: WNW at 11G21 kts, peak of 36 MPH at 12:20 P.M.
Sea-level pressure: 29.88 ins. Hg: rising, then falling
Visibility: 75 miles
6-hr Max temp: 66F
6-hr Min temp: 46F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 250 SCT 75 118/66/31/2911G21/988/ PK WND 2931/20/
8/007 56007 10066 20046

SUMMARY FOR FRIDAY, MAY 1, 2020

TEMPERATURE (DEGREES F)
MAX…..64   NORMAL…..62
MIN…..52   NORMAL…..43
MEAN….58   NORMAL…..53

DEPARTURE FROM 30-YEAR NORMAL……………….+5
TOTAL DEPARTURE FOR THE MONTH……………….+5 [+4.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….7  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH…………….7  DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE SEASON…………5528  DEPARTURE……-519
TOTAL HEATING UNITS LAST SEASON TO DATE…….5916  DEPARTURE……-388

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..46 SSE AT  3:47 A.M.
AERO…………………….44 SSE AT  3:48 A.M.
ASOS…………………….43 SSE AT  3:47 A.M.
DAVIS……………………46 SSE AT  3:46 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….30 SSE AT  3:47 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….28 SSE AT  3:47 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………30 SSE AT  3:47 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….12.1 SSE
ASOS…………………….11.8
DAVIS……………………12.0 SSE [159 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.24  DEPARTURE……+0.12
ASOS…………..0.29
TOTAL PRECIPITATION FOR THE MONTH……….0.94  DEPARTURE……+0.82
ASOS…………..0.96
TOTAL PRECIPITATION FOR THE YEAR……….17.97  DEPARTURE……-0.70
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 The low since midnight is 42F, the daily normal low is 44F

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

RECORDS FOR MAY 2
HIGH 92F IN 2001
LOW 29F IN 1903
PRECIP 1.36 INCHES IN 2006
SNOWFALL 1.0 INS IN 1888
PEAK GUST 58 MPH S IN 1983

RECORDS FOR MAY 3
HIGH 92F IN 2001
LOW 31F IN 1888
PRECIP 2.25 INS IN 1900
SNOWFALL TRACE IN 1908, 1985
PEAK GUST 71 MPH W IN 2002

TODAY’S REPORT PREPARED BY: Benjamin Turner