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Sunday, May 3, 2020

May 4, 2020

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, MAY…

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 3, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

AN EARLY SUMMER DAY WITH GOOD VISIBILITY
AND WARM TEMPERATURES….

We observed incredibly summer-like conditions
today, considering low humidity and decent
visibility. Wind has been coming in around
15 mph from the southwest, with a max gust
of 36 mph since 7 A.M. The weather has become
progressively dryer as the day went on, with
a humidity of 29% being seen after the 1 P.M.
observation.

The high so far today is 72F, this is 9 degrees
above our daily normal high temperature of 63F.
The low since midnight is 55F, which is 12 degrees
above the daily normal low of 43F.

Today’s Observations:

7 A.M.
Weather: Broken cirrus
Temperature: 60F; Dew Point: 44F; Relative Humidity: 55%
Wind: SSW at 15G23 kts
Sea-level pressure: 29.80 ins. Hg: falling steadily
Visibility: 65 miles
6-hr Max temp: 60F
6-hr Min temp: 55F
24-hr Precip: 0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E250 BKN 65 091/60/44/2015G23/980/ 8/002
58008 10060 20055

10 A.M.
Weather: Scattered altocumulus, broken cirrus
Temperature: 65F; Dew Point: 49F; Relative Humidity: 56%
Wind: SW at 12G24 kts, peak of 33 MPH at 9:25 A.M.
Sea-level pressure: 29.74 ins. Hg: falling steadily
Visibility: 65 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 80 SCT E250 BKN 65 072/65/49/2112G24/974/
PK WND 1929/25/ 8/072 58019

1 P.M.
Weather: Broken cumulus
Temperature: 72F; Dew Point: 50F; Relative Humidity: 46%
Wind: WSW at 13G18 kts
Sea-level pressure: 29.66 ins. Hg: falling
Visibility: 70 miles
6-hr Max temp: 72F
6-hr Min temp: 60F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 55 BKN 70 047/72/50/2413G18/966/ 8/800 56025
10072 20060

SUMMARY FOR SATURDAY, MAY 2, 2020

TEMPERATURE (DEGREES F)
MAX…..70   NORMAL…..62
MIN…..42   NORMAL…..44
MEAN….56   NORMAL…..53

DEPARTURE FROM 30-YEAR NORMAL……………….+3
TOTAL DEPARTURE FOR THE MONTH……………….+8 [+3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….9  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH……………16  DEPARTURE…….-19
TOTAL HEATING UNITS FOR THE SEASON…………5537  DEPARTURE……-523
TOTAL HEATING UNITS LAST SEASON TO DATE…….5938  DEPARTURE……-401

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..41 NW  AT  2:36 A.M.
AERO…………………….40 NW  AT  3:03 A.M.
ASOS…………………….41 NW  AT  2:36 A.M.
DAVIS……………………40 NW  AT  2:35 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….29 NW  AT  2:37 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….28 NW  AT  2:37 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………29 NW  AT  2:37 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….14.5 NW
ASOS…………………….13.3
DAVIS……………………14.5 WNW [306 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……….0.94  DEPARTURE……+0.70
ASOS…………..0.96
TOTAL PRECIPITATION FOR THE YEAR……….17.97  DEPARTURE……-0.82
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 The low since midnight is 55F, 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 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

RECORDS FOR MAY 4
HIGH 90F IN 2001
LOW 27F IN 1911 (RECORD FOR MAY)
PRECIP 1.92 INCHES IN 1893
SNOWFALL 0.1 INCHES IN 1920
PEAK GUST 60 MPH NW IN 1966

TODAY’S REPORT PREPARED BY: Benjamin Turner

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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