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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 11, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

BREEZY WITH EXCELLENT VISIBILITY ATOP 
GREAT BLUE HILL....

We observed fair weather today with almost clear skies 
this morning. Wind was on the stronger side, coming in
from the west at a constant speed around 25 mph in the 
afternoon hours. The max gust so far today is almost 
40 mph. Visibility has been excellent today, not falling
below 85 miles. Rain and ice pellets yesterday amounted
to 0.02 inches in the gauge, falling in the mid-afternoon
hours.   

Our high temperature so far today is 50F, which is 4
degrees below our daily normal high temperature of 54F.
The low since midnight is 33F, which is 3 degrees below
the daily normal low of 36F. 


PRELIMINARY STATS FOR MARCH 2020

TEMPERATURE, Deg. F
Avg. Max. 49.8 [+5.5]
Avg. Min. 32.3 [+5.7]
Mean      41.1 [+5.6]
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: 11298 minutes of possible 21516 or 53%
Astronomical total minutes: 11708 minutes of possible 22287 or 53%

Today's Observations:

7 A.M.
Weather: Clear; few cumulus SW-NW
Temperature: 36F; Dew Point: 26F; Relative Humidity: 65%
Wind: W at 12G17 kts
Sea-level pressure: 29.73 ins. Hg: falling then rising
Visibility: 85 miles
6-hr Max temp: 36F
6-hr Min temp: 33F
24-hr Precip:  0.02 ins.
24-hr Snowfall: Trace
BHO SA 1155 CLR 85 067/36/26/2712G17/973/ FEW CU SW-NW/ 
8/100 70002 51026 10036 20033

10 A.M.
Weather: Broken cumulus
Temperature: 45F; Dew Point: 21F; Relative Humidity: 38%
Wind: W at 21G30 kts
Peak wind: 35 MPH (30 kts) W at 9:41 A.M.
Sea-level pressure: 29.76 ins. Hg: rising steadily
Visibility: 85 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E55 BKN 85 077/45/21/2721G30/976/ PK WND 
2830/41/ 8/100 53010  

1 P.M.
Weather: Broken cumulus 
Temperature: 49F; Dew Point: 20F; Relative Humidity: 31%
Wind: W at 20G29 kts
Peak wind: 37 MPH (32 kts) W at 12:36 P.M.
Sea-level pressure: 29.77 ins. Hg: steady, then rising
Visibility: 85 miles
6-hr Max temp: 50F
6-hr Min temp: 36F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E55 BKN 85 078/49/20/2820G29/977/ PK WND 
2832/36/ 8/100 55001 10050 20036 


SUMMARY FOR FRIDAY, APRIL 10, 2020 

TEMPERATURE (DEGREES F)
MAX.....47   NORMAL.....53
MIN.....35   NORMAL.....36
MEAN....41   NORMAL.....45

DEPARTURE FROM 30-YEAR NORMAL....................-4
TOTAL DEPARTURE FOR THE MONTH....................+8 [+0.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............24  DEPARTURE.......+4
TOTAL HEATING UNITS FOR THE MONTH..............214  DEPARTURE.......-8
TOTAL HEATING UNITS FOR THE SEASON............5087  DEPARTURE......-619
TOTAL HEATING UNITS LAST SEASON TO DATE.......5634  DEPARTURE......-547

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................48 W   AT  3:38 P.M.  
                   AERO.........................50 W   AT  3:39 P.M  
                   ASOS.........................49 NW  AT  3:37 P.M. 
                   DAVIS........................51 WNW AT  3:32 P.M. RMY 53
FASTEST MILE FOR YESTERDAY......................38 W   AT  3:38 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................37 NW  AT  3:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................40 NW  AT  3:37 P.M.
AVERAGE WIND SPEED AND DIRECTION.............. 20.3 W               
                   ASOS....................... 18.7
                   DAVIS.......................20.6 WNW [282 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02  DEPARTURE......-0.16
                         ASOS..............0.02
TOTAL PRECIPITATION FOR THE MONTH..........3.48  DEPARTURE......+1.78
                         ASOS..............3.59
TOTAL PRECIPITATION FOR THE YEAR..........12.81  DEPARTURE......-2.89
                         ASOS.............13.32

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.......-1.6
TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE......-33.7


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/..../0.0/631/84        32 NW  AERO M  M   RMY 33
03/28  56/36/46/+7/..../0.0/309/41         22 S   AERO 21 E   RMY N/A
03/29  43/37/40/0/..../0.0/000/00          32 NE  AERO 33 NE  RMY 33
03/30  40/34/37/-3/..../0.0/000/00         33 NE  AERO 33 NE  RMY 33
03/31  40/29/35/-6/..../0.0/564/74         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  63/42/53/+10/0.00/0.0/.../..        29 W   AERO 30 W   RMY 28
04/08  50/41/46/+2/..../.../.../..         23 S   AERO 22 S   RMY 22 
04/09  47/37/42/-2/..../.../.../..         58 W   AERO 58 W   RMY 56
04/10  47/35/41/-4/0.02/T/.../..           48 W   AERO 50 W   RMY 53 

04/11 The low since midnight is 33F, daily normal minimum is 36F 

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

RECORDS FOR APRIL 11
HIGH 85 IN 2017
LOW 19 IN 1909
PRECIP 1.72 IN. IN 2003
SNOWFALL 9.5 IN. IN 1958
PEAK GUST 65 MPH NW IN 1963

RECORDS FOR APRIL 12
HIGH 82 IN 1945
LOW 17 IN 1926
PRECIP 1.51 IN. IN 1993
SNOWFALL 12.0 IN. IN 1894
PEAK GUST 65e MPH W IN 1978

TODAY'S REPORT PREPARED BY: Benjamin Turner