Monday, March 29, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, MARCH 29, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0531E
SUNSET: 1807E
A FAIR WEATHER DAY, BUT CHILLY WITH A GOOD AMOUNT OF WIND….
Yesterday’s rain amounted to 8/10ths of an inch, bringing
the monthly rain deficit down to -3.18 inches. The annual
deficit is still -3.60 inches.
Today we observed partly cloudy skies and a good amount of
wind. Wind was strong from the west today, with an average
speed of 30 mph, frequent gusts of 40 mph, and a max gust
of almost 60 mph. This kept the observatory rather cool,
as a significant amount of cooler air was brought in from
the west.
Visibility was great at 80 miles, and pressure is rising
rather quickly. There has been an increase of more than
12 millibars since this morning!
The high so far today is 48F, a degree below the normal
high of 49F. The low since midnight is 38F, which
is 7 degrees above the daily normal low of 31F.
Today’s Observations:
7 A.M.
Weather: Broken cumulus and cirrus
Temperature: 40F; Dew Point: 27F; Relative Humidity: 59%
Wind: W @ 25G40 kts,
Peak Wind: 48 MPH (42 knots), West @ 6:37 A.M.
Sea-level pressure: 29.59 in Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 45F
6-hr Min temp: 38F
24-hr Precip: 0.80 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 50 BKN 220 BKN 80 021/40/27/2725G40/959/ PK WND 2642/37/
8/801 70080 53034 10045 20038
10 A.M.
Weather: Broken cumulus and cirrus
Temperature: 45F; Dew Point: 26F; Relative Humidity: 46%
Wind: W @ 19G37 kts
Peak Wind: 53 MPH (46 knots), West @ 9:58 A.M.
Sea-level pressure: 29.70 in Hg; rising, then more rapidly
Visibility: 80 miles
3-hr Precip: 0.00 ins
3-hr Snow: 0.0 ins.
BHO SA 1455 50 BKN 250 BKN 80 062/45/26/2819G37/970/ PK WND 2846/58/
8/801 53041
1 P.M.
Weather: Broken cumulus and cirrus
Temperature: 47F, Dew point: 25F; Relative Humidity: 41%
Wind: W @ 24G37 kts
Peak Wind: 46 MPH (40 knots), West @ 12:03 P.M.
Sea-level pressure: 29.82 in Hg; rising, then more rapidly
Visibility: 80 miles
6-hr Max temp: 48F
6-hr Min temp: 40F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 50 BKN 250 BKN 80 105/47/25/2724G37/982/ PK WND 2740/03/
8/801 53043 10048 20040
SUMMARY FOR SUNDAY, MARCH 28, 2021
TEMPERATURE (DEGREES F)
MAX…….56 NORMAL…..48
MIN…….37 NORMAL…..31
MEAN……47 NORMAL…..49
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. +8
TOTAL DEPARTURE FOR THE MONTH………………. +116 [+3.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………18 DEPARTURE……-8
TOTAL HEATING UNITS FOR THE MONTH…………..725 DEPARTURE…..-116
TOTAL HEATING UNITS FOR THE SEASON…………4770 DEPARTURE…..-639
TOTAL HEATING UNITS LAST SEASON TO DATE…….4790 DEPARTURE……-20
PEAK WIND GUST (MPH):
420C/Official…………..40 S @ 5:28 P.M.
AEROVANE (south tower)…..41 S @ 5:11 P.M.
ASOS…………………..41 SSW @ 5:32 P.M.
DAVIS #1……………….46 N @ 5:31 P.M.
DAVIS #2 (south tower)…..40 SSE @ 4:07 P.M.
RMY……………………46 @ 5:30 P.M.
VECTOR…………………48 S @ 5:26 P.M.
MERLIN…………………M
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………32 S @ 5:30 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….31 S @ 5:30 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………31 NNW @ 5:29 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 S @ 5:13 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..31 SSW @ 5:27 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..31 @ 5:26 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……14.8 SE [355 total miles] ASOS…………………13.6
DAVIS #1……………..14.7 S
DAVIS #2……………..15.3 SSE
RMY………………….14.5 S
VECTOR……………….14.9
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.80 DEPARTURE….+0.62
ASOS………….0.85
TOTAL PRECIPITATION FOR THE MONTH………….1.86 DEPARTURE….-3.18
ASOS………….1.94
TOTAL PRECIPITATION FOR THE YEAR…………..9.86 DEPARTURE….-3.60
ASOS………..10.20
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………. 0.0 DEPARTURE…. -0.3
TOTAL SNOWFALL FOR THE MONTH……………… 0.2 DEPARTURE….-11.7
TOTAL SNOWFALL FOR THE SEASON……………..72.6 DEPARTURE….+14.2
PRELIMINARY CLIMATE SUMMARY FOR MARCH 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
03/01 42/24/33/+2/0.13/T/020/03 69 WNW AERO 78 WNW RMY 78
03/02 27/10/19/-12/T/0.1/679/100 63 WNW AERO 71 WNW RMY 69
03/03 45/19/32/0/0.00/0.0/375/55 30 W AERO 30 W RMY 34
03/04 38/22/30/-2/0.00/0.0/520/76 46 NW AERO 51 NW RMY 53
03/05 31/18/25/-7/0.00/0.0/549/80 39 WNW AERO 44 NW RMY 45
03/06 33/15/24/-8/0.00/0.0/675/98 28 WNW AERO 29 WNW RMY 30
03/07 35/15/25/-8/0.00/0.0/686/99 21 NW AERO 22 NW RMY 23
03/08 38/19/29/-4/T/T/389/56 20 NW AERO 20 NW RMY 21
03/09 56/30/43/+10/T/T/…/.. 32 WNW AERO 35 WNW RMY 37
03/10 54/32/43/+10/0.00/0.0/…/.. 29 SSW AERO 29 SSW RMY 31
03/11 71/35/53/+19/0.00/0.0/…/.. 41 SSW AERO 43 SSW RMY 46
03/12 62/42/52/+18/0.00/0.0/…/.. 52 WNW AERO 59 WNW RMY 57
03/13 46/27/37/+3/0.00/0.0/…/.. 53 WNW AERO 59 WNW RMY 57
03/14 45/19/32/-3/0.01/0.1/…/.. 51 WNW AERO 58 NW RMY 58
03/15 27/12/20/-15/0.00/0.0/…/.. 48 NW AERO 47 NW RMY 54
03/16 37/13/25/-10/0.00/0.0/…/.. 22 NNW AERO 22 NNW RMY 23
03/17 52/27/40/+4/0.00/0.0/…/.. 28 S AERO 25 S RMY 29
03/18 46/34/40/+4/0.80/T/…/.. 38 NE AERO 40 NE RMY 42
03/19 39/26/33/-3/T/T/…/.. 37 N AERO 38 N RMY 41
03/20 58/24/41/+4/0.00/0.0/…/.. 23 W AERO 23 W RMY 27
03/21 62/39/51/+14/0.00/0.0/…/.. 22 S AERO 23 S RMY 25
03/22 62/36/49/+12/0.00/0.0/…/.. 21 S AERO 18 S RMY 22
03/23 65/38/52/+14/0.00/0.0/…/.. 22 ESE AERO 18 SE RMY 21
03/24 63/44/54/+16/…./0.0/…/.. 22 SSE AERO 21 SSE RMY 21
03/25 67/49/58/+20/0.11/0.0/…/.. 25 S AERO 26 S RMY 26
03/26 63/48/56/+17/0.01/0.0/…/.. 58 W AERO 67 W RMY 63
03/27 63/40/52/+13/0.00/0.0/…/.. 39 WNW AERO 41 WNW RMY 44
03/28 56/37/47/+8/0.80/0.0/…/.. 40 S AERO 41 S RMY 46
03/29 The low since midnight is 38F, the daily normal low is 31F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MARCH 29
HIGH 85 IN 1945
LOW -2 IN 1923
PRECIP 2.78 INS. IN 1984
SNOWFALL 13.5 INS. IN 1984
PEAK GUST 95 MPH ENE IN 1984
RECORDS FOR MARCH 30
HIGH 83 IN 1977
LOW 10 IN 1887
PRECIP 2.92 INS. IN 2010
SNOWFALL 3.9 INS. IN 1957
PEAK GUST 60 MPH NW IN 1999
TODAY’S REPORT PREPARED BY: Benjamin Turner
