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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 7, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER VERY PLEASANT DAY WITH MILD TEMPERATURES....

A mix of sun and clouds have been the theme today with
mild temperatures and a variable westerly breeze. All
in all, another very nice day. Visibility has been 
excellent at 70 to 80 miles all day.

Temperatures have risen into the lower 60s with dew
points in the low to mid 20s. Relative humidities have
been between 20-25% this afternoon, thus very dry air is
in place.

Our high temperature so far today is 61F, which is 9 
degrees above our daily normal high temperature of 52F.
The low since midnight is 42F, which is 7 degrees above
the daily normal low of 35F. 


PRELIMINARY STATS FOR MARCH 2020

TEMPERATURE, Deg. F
Avg. Max. 49.8 [+5.5]
Avg. Min. 32.3 [+5.7]
Mean      41.4 [+5.9]
24-hour corrected mean: 40.5
Max. for month: 72F on the 9th
Min. for month: 15F on the 1st

HEATING DEGREE DAYS
Total heating units:    733 [-183]
Total for the season:  4873 [-611]
Total for last season: 5432

PRECIPITATION, Inches
Total: 4.67 [-0.91]
Greatest in 24 hrs: N/A 

SNOWFALL, Inches
Total: 2.8 [-9.9]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 12.6 mph
Avg. corrected wind speed:   12.9 mph
Prevailing wind direction:   W [12%]
Peak gust and direction:     56 W on the 4th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today's Observations:

7 A.M.
Weather: Broken altocumulus, broken  dense cirrus
Temperature: 46F; Dew Point: 21F; Relative Humidity: 36%
Wind: WNW at 7 kts 
Sea-level pressure: 29.92 ins. Hg: rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 46F
6-hr Min temp: 42F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E90 BKN 250 BKN 80 131/46/21/3007/992/ 8/072
51007 10046 20042

10 A.M.
Weather: Scattered cumulus, scattered dense cirrus
Temperature: 54F; Dew Point: 20F; Relative Humidity: 26%
Wind: WNW at 6 kts
Sea-level pressure: 29.89 ins. Hg: falling unsteadily
Visibility: 70 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 50 SCT 250 SCT 70 122/54/20/3006/989/ WND LGT/
8/102 57009

1 P.M.
Weather: Scattered cumulus, thin scattered cirrus
Temperature: 60F; Dew Point: 24F; Relative Humidity: 24%
Wind: W at 14G21 kts
Sea-level pressure: 29.81 ins. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 61F
6-hr Min temp: 46F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 70 SCT 250 –SCT 70 095/60/24/2814G21/981/ 8/101
58027 10061 20046 


SUMMARY FOR MONDAY, APRIL 6, 2020 

TEMPERATURE (DEGREES F)
MAX.....61   NORMAL.....52
MIN.....40   NORMAL.....34
MEAN....51   NORMAL.....43

DEPARTURE FROM 30-YEAR NORMAL....................+8
TOTAL DEPARTURE FOR THE MONTH....................+2 [+0.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............14  DEPARTURE........-8
TOTAL HEATING UNITS FOR THE MONTH..............136  DEPARTURE........-2
TOTAL HEATING UNITS FOR THE SEASON............5009  DEPARTURE......-613
TOTAL HEATING UNITS LAST SEASON TO DATE.......5542  DEPARTURE......-533

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................29 NW  AT  7:27 A.M.  
                   AERO.........................30 NW  AT  7:48 A.M  
                   ASOS.........................28 NW  AT  7:27 A.M. 
                   DAVIS........................28 N   AT  7:23 A.M. RMY 29
FASTEST MILE FOR YESTERDAY......................21 NNW AT  7:30 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................20 NNW AT  7:29 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 NNW AT  7:29 A.M.
AVERAGE WIND SPEED AND DIRECTION.............. 9.9 NW               
                   ASOS....................... 9.0
                   DAVIS......................10.2 WNW [306 deg.]

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..........2.72  DEPARTURE......+1.70
                         ASOS..............2.82
TOTAL PRECIPITATION FOR THE YEAR..........12.05  DEPARTURE......-2.97
                         ASOS.............12.55

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.1
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE.......-1.1
TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE......-33.2


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  33/15/24/-7/0.00/0.0/676/100        28 WNW AERO 28 WNW RMY 27
03/02  52/24/38/+7/T/T/482/71              40 S   AERO 39 S   RMY 41
03/03  64/45/55/+23/..../0.0/361/53        30 S   AERO 30 S   RMY N/A
03/04  50/38/44/+12/..../0.0/561/82        56 W   AERO 56 W   RMY 58
03/05  51/32/42/+10/0.00/0.0/666/97        31 W   AERO 31 NW  RMY 32
03/06  47/30/39/+7/..../.../283/41         46 NE  AERO 45 NE  RMY 46
03/07  43/26/35/+2/..../.../534/77         42 N   AERO 43 N   RMY 44
03/08  53/26/40/+7/0.00/0.0/508/73         31 W   AERO 30 W   RMY 28
03/09  72/40/56/+23/0.00/0.0/685/98        32 SW  AERO 32 SW  RMY 31
03/10  68/49/59/+26/0.00/0.0/246/35        48 WSW AERO 46 WSW RMY 49
03/11  56/37/47/+13/0.00/0.0/501/71        31 WNW AERO M  M   RMY 21
03/12  46/31/39/+5/..../0.0/156/22         21 SE  AERO 18 SE  RMY N/A
03/13  59/38/49/+15/..../0.0/000/00        46 WNW AERO 44 WNW RMY 46
03/14  51/35/43/+8/0.00/0.0/613/86         37 W   AERO 36 W   RMY 35
03/15  47/28/38/+3/0.00/0.0/680/95         28 NW  AERO 28 NW  RMY N/A
03/16  36/22/29/-6/0.00/0.0/618/86         21 NE  AERO 21 ESE RMY 21
03/17  43/28/36/0/..../0.4/000/00          29 W   AERO 30 W   RMY 29
03/18  54/31/43/+7/..../0.0/609/84         26 S   AERO 26 S   RMY 26
03/19  43/37/40/+4/..../0.0/000/00         36 E   AERO 35 E   RMY 34
03/20  66/37/52/+15/..../0.0/000/00        48 W   AERO 48 W   RMY 46
03/21  55/29/42/+5/0.00/0.0/535/73         45 W   AERO 48 W   RMY N/A
03/22  36/23/30/-7/0.00/0.0/692/94         23 NE  AERO 24 NE  RMY 23
03/23  40/25/33/-5/..../1.6/037/05         38 NNE AERO 39 NNE RMY 38
03/24  48/33/41/+3/..../.../148/20         37 NNW AERO 37 NNW RMY N/A
03/25  41/35/38/0/0.03/0.0/000/00          28 ENE AERO 28 ENE RMY 27
03/26  51/30/41/+2/..../0.0/613/82         25 SSE AERO 26 SSW RMY N/A
03/27  61/41/51/+12/..../0.0/.../..        32 NW  AERO M  M   RMY 33
03/28  56/36/46/+7/..../0.0/.../..         22 S   AERO 21 E   RMY N/A
03/29  43/37/40/0/..../0.0/.../..          32 NE  AERO 33 NE  RMY 33
03/30  40/34/37/-3/..../0.0/.../..         33 NE  AERO 33 NE  RMY 33
03/31  40/29/35/-6/..../0.0/.../..         28 ENE AERO 26 ENE RMY N/A

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/.../..         28 NE  AERO 28 NE  RMY 30
04/02  46/35/41/0/.../0.0/.../..           39 NW  AER0 40 NW  RMY 41
04/03  42/38/40/-2/..../0.0/.../..         48 NE  AERO 53 NE  RMY 49
04/04  46/36/41/-1/..../0.0/.../..         38 NE  AERO 38 NE  RMY N/A
04/05  55/36/46/+3/T/0.0/.../..            22 S   AERO 21 S   RMY 21
04/06  61/40/51/+8/0.00/0.0/.../..         29 NW  AERO 30 NW  RMY 29

04/07 The low since midnight is 42F, daily normal minimum is 35F 

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

RECORDS FOR APRIL 7
HIGH 90 IN 2010
LOW 13 IN 1982
PRECIP 1.72 IN. IN 1924
SNOWFALL 4.5 IN. IN 1967, 1996
PEAK GUST 65 MPH WNW IN 1982

RECORDS FOR APRIL 8
HIGH 87 IN 1991
LOW 17 IN 1888
PRECIP 1.78 IN. IN 1956
SNOWFALL 9.3 IN. IN 1956
PEAK GUST 70 MPH S IN 2000

TODAY'S REPORT PREPARED BY: Matt Douglas