Monday, April 5, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, APRIL 5, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0519E
SUNSET: 1815E
LOTS OF CLOUDS AND WINDY CONDITIONS AT BLUE HILL….
An ocean storm south of Nova Scotia has been retrograding a
bit sending a spoke of clouds and even a few flurries and
sprinkles to the area this morning into early this afternoon.
A gusty northwest wind has also been blowing across the
summit as the pressure gradient between the low to the
east and high pressure to the west increases. Gusts exceeding
40 mph have been observed. The average speed since 7 A.M.
has been around 16 mph.
Despite the clouds and occasional flurry/sprinkle, visibility
has been spectacular hanging at around 70 to 80 miles all day!
The high today so far today is 54F, this is 3 degree above
the normal high of 51F. The low since midnight is 41F, which
is 7 degrees above the daily normal low of 34F.
PRELIMINARY STATS FOR MARCH 2021
TEMPERATURE, Deg. F
Avg. Max. 50.2 [+5.9]Avg. Min. 29.1 [+2.5]Mean 39.7 [+4.2]24-hour corrected mean: 39.2
Max. for month: 71F on the 11th
Min. for month: 10F on the 2nd
HEATING DEGREE DAYS
Total heating units: 777 [-139]Total for the season: 4822 [-662]Total for last season: 5484
PRECIPITATION, Inches
Total: 2.17 [-3.41]Greatest in 24 hrs: 0.80 ins. on the 18th and 28th
SNOWFALL, Inches
Total: 0.2 [-12.5]Greatest in 24 hrs: 0.1 ins. on the 2nd and 14th
WIND, mph
Avg. uncorrected wind speed: 13.8 mph
Avg. corrected wind speed: 14.2 mph
Prevailing wind direction: WNW [22%]Peak gust and direction: 69 WNW on the 1st
SUNSHINE:
Campbell-Stokes card minutes: 14580 out of 21516 or 68%
Astronomical total minutes: 15099 out of 22265 or 68%
Today’s Observations:
7 A.M.
Weather: Broken altostratus, thin broken cirrus, few stratocumulus
distant ENE-ESE, virga N-E-SSE
Temperature: 44F; Dew Point: 15F; Relative Humidity: 30%
Wind: NNW @ 13G23 kts, peak wind NW 31 mph at 5:57 A.M.
Sea-level pressure: 29.82 in Hg, rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 44F
6-hr Min temp: 41F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E65 BKN 250 -BKN 80 099/44/15/3313G23/982/
FEW SC DSNT ENE-ESE VIRGA N-E-SSE PK WND 3227/57/ 8/521
51012 10044 20041
10 A.M.
Weather: Broken altocumulus standing lenticularis,
broken altostratus, virga distant N-E-SE
Temperature: 48F; Dew Point: 18F; Relative Humidity: 29%
Wind: NW @ 16G30 kts, peak wind NW 35 mph at 9:46 A.M.
Sea-level pressure: 29.80 in Hg; steady, then falling
Visibility: 80 miles
3-hr Precip: Trace
3-hr Snow: Trace
BHO SA 1455 E45 BKN 120 BKN 80 092/48/18/3216G30/980/
VIRGA DSNT N-E-SE PK WND 3230/46/ TOTAL NEW SNW PST 3 HRS TRACE/
8/020 58007 6000/
1 P.M.
Weather: Broken altocumulus, broken cirrostratus
Temperature: 53F, Dew point: 15F; Relative Humidity: 21%
Wind: NNW @ 18G30 kts, peak wind NNW 39 mph at 12:20 P.M.
Sea-level pressure: 29.75 in Hg; falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 54F
6-hr Min temp: 43F
6-hr Precip: Trace
6-hr Snow: Trace
Snow Depth: 0 ins.
BHO SA 1755 E50 BKN 200 BKN 70 074/53/15/3318G30/975/
VIRGA N-E-SSE PK WND 3334/20/ TOTAL NEW SNW PST 6 HRS TRACE/
8/058 56018 6000/ 10054 20043
SUMMARY FOR SUNDAY, APRIL 4, 2021
TEMPERATURE (DEGREES F)
MAX…….58 NORMAL…..51
MIN…….33 NORMAL…..33
MEAN……46 NORMAL…..42
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…… +4
TOTAL DEPARTURE FOR THE MONTH………………-10 [-2.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………19 DEPARTURE…….-4
TOTAL HEATING UNITS FOR THE MONTH…………..104 DEPARTURE……+10
TOTAL HEATING UNITS FOR THE SEASON…………4926 DEPARTURE…..-652
TOTAL HEATING UNITS LAST SEASON TO DATE…….4976 DEPARTURE……-50
PEAK WIND GUST (MPH):
420C/Official…………..38 NNW @ 9:47 P.M.
AEROVANE (south tower)…..41 NNW @ 9:47 P.M.
ASOS…………………..35 NNW @ 9:48 P.M.
DAVIS #1……………….37 NNW @ 9:47 P.M.
DAVIS #2 (south tower)…..35 NW @ 9:38 P.M.
RMY……………………41 @ 9:46 P.M.
VECTOR…………………42 @ 9:48 P.M.
MERLIN…………………N/A
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………27 NNW @ 9:48 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 NW @ 9:48 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 NNW @ 9:48 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 NNW @ 9:49 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..26 NNW @ 9:45 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..28 @ 9:46 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….11.5 NW [275 total miles] ASOS………………….10.9
DAVIS #1………………11.7 NW
DAVIS #2………………11.6 NNW
RMY…………………..11.0 NNW
VECTOR………………..11.6
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.17
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.89 DEPARTURE….+0.21
ASOS………….0.87
TOTAL PRECIPITATION FOR THE YEAR………….11.06 DEPARTURE….-3.61
ASOS………..11.38
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0 DEPARTURE…. -0.1
TOTAL SNOWFALL FOR THE MONTH …………….TRACE DEPARTURE…..-0.8
TOTAL SNOWFALL FOR THE SEASON……………..72.6 DEPARTURE….+12.6
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/-7/0.00/0.0/556/81 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/-8/0.00/0.0/679/98 21 NW AERO 22 NW RMY 23
03/08 38/19/29/-4/T/T/653/94 20 NW AERO 20 NW RMY 21
03/09 56/30/43/+10/T/T/628/90 32 WNW AERO 35 WNW RMY 37
03/10 54/32/43/+10/0.00/0.0/666/95 29 SSW AERO 29 SSW RMY 31
03/11 71/35/53/+19/0.00/0.0/218/31 41 SSW AERO 43 SSW RMY 46
03/12 62/42/52/+18/0.00/0.0/614/87 52 WNW AERO 59 WNW RMY 57
03/13 46/27/37/+3/0.00/0.0/696/98 53 WNW AERO 59 WNW RMY 57
03/14 45/19/32/-3/0.01/0.1/449/63 51 WNW AERO 58 NW RMY 58
03/15 27/12/20/-15/0.00/0.0/694/97 48 NW AERO 47 NW RMY 54
03/16 37/13/25/-10/0.00/0.0/352/49 22 NNW AERO 22 NNW RMY 23
03/17 52/27/40/+4/0.00/0.0/483/67 28 S AERO 25 S RMY 29
03/18 46/34/40/+4/0.80/T/000/00 38 NE AERO 40 NE RMY 42
03/19 39/26/33/-3/T/T/683/94 37 N AERO 38 N RMY 41
03/20 58/24/41/+4/0.00/0.0/701/96 23 W AERO 23 W RMY 27
03/21 62/39/51/+14/0.00/0.0/704/96 22 S AERO 23 S RMY 25
03/22 62/36/49/+12/0.00/0.0/698/95 21 S AERO 18 S RMY 22
03/23 65/38/52/+14/0.00/0.0/568/77 22 ESE AERO 18 SE RMY 21
03/24 63/44/54/+16/0.01/0.0/163/22 22 SSE AERO 21 SSE RMY 21
03/25 67/49/58/+20/0.10/0.0/201/27 25 S AERO 26 S RMY 26
03/26 63/48/56/+17/0.01/0.0/127/17 58 W AERO 67 W RMY 63
03/27 63/40/52/+13/0.00/0.0/608/81 39 WNW AERO 41 WNW RMY 44
03/28 56/37/47/+8/0.80/0.0/000/00 40 S AERO 41 S RMY 46
03/29 50/35/43/+3/T/0.0/718/95 58 WNW AERO 62 WNW RMY 63
03/30 58/31/45/+5/0.00/0.0/720/95 36 S AERO 36 S RMY 37
03/31 66/43/55/+14/0.31/0.0/251/33 41 SSW AERO 45 S RMY 44
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 56/30/43/+2/0.89/T/…/.. 44 NW AERO 51 NW RMY 49
04/02 37/24/31/-10/0.00/0.0/…/.. 28 NW AERO 32 NNW RMY 30
04/03 48/23/36/-6/0.00/0.0/…/.. 24 NW AERO 25 NW RMY 26
04/04 58/33/46/+4/0.00/0.0/…/.. 38 NNW AERO 41 NNW RMY 41
04/05 The low since midnight is 41F, the daily normal low is 34F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 5
HIGH 81 IN 1928
LOW 15 IN 1995
PRECIP 2.15 IN. IN 1987
SNOWFALL 4.0 IN. IN 1898
PEAK GUST 76 MPH WNW IN 1963
RECORDS FOR APRIL 6
HIGH 82 IN 1921
LOW 16 IN 1982
PRE 1.72 INS IN 1886
SNOW 12.3 INS IN 1982
WIND 71e MPH WNW IN 1940
TODAY’S REPORT PREPARED BY: Matt Douglas
