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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, APRIL 27, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

YET ANOTHER STORMY MONDAY; COLD, WET, AND WINDY....

Another start to a week and another stormy day to add
to the many we've seen in the month of April. Rain 
started falling yesterday afternoon and has continued 
through much of today, albeit mainly on the light side.
Some wet snow flakes have mixed in a times this afternoon
as the temperature slowly dips toward the mid 30s.

0.78" of rain was measured through 7am this morning with
an additional 0.22" being measured through 1pm. This gives
a storm total through 1pm of exactly 1 inch!

Rainfall for the month ending at 7am this morning stands
at 7.12", this is more than 3 inches above normal to date.

In addition to the wet conditions, very gusty winds out of 
northeast to north-northeast have been occurring since last
evening. We've seen several gusts exceeding 50mph during
the period with a peak gust of 54 mph occurring this morning
at 8:03 EST.

We will likely set a new record low max for the date today
as our high temperature so far today is only 39F. The
record was 40F set in 1917.

39F is 21 degrees below our daily normal high temperature of
60F. The low since midnight is 37F, which is 5 degrees below 
the daily normal low of 42F. 


Today's Observations:

7 A.M.
Weather: Overcast stratus fractus, light drizzle
Temperature: 38F; Dew Point: 38F; Relative Humidity: 100%
Wind: NNE at 20G35 kts, peak wind NNE 41kts at 6:04
Sea-level pressure: 29.79 ins. Hg: rising, then more slowly
Visibility: 2.5 miles, fog
6-hr Max temp: 39F
6-hr Min temp: 38F
24-hr Precip:  0.78 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E1 OVC 21/2L-F 087/38/38/0320G35/979/ STRAFRA OCCLY
DRFTG OVR SMT PK WND 0341/04/ 8/7// 51010 6/// 70078 10039 20038

10 A.M.
Weather: Overcast stratus fractus, drizzle
Temperature: 38F; Dew Point: 38F; Relative Humidity: 100%
Wind: NNE at 20G40 kts, peak wind 44 kts NNE at 9:02
Sea-level pressure: 29.82 ins. Hg: rising, then more rapidly
Visibility: 1 mile, fog 
3-hr Precip:   0.11 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E3 OVC 1LF 099/38/38/0320G40/982/ STRAFRA OCCLY DRFTG
OVR SMT PK WND 0344/02/ 8/7// 53012 6011

1 P.M.
Weather: Broken stratus fractus, overcast stratus, light drizzle
Temperature: 37F; Dew Point: 37F; Relative Humidity: 100%
Wind: NNE at 21G37 kts, peak wind 38 kts NNE at 12:08
Sea-level pressure: 29.86 ins. Hg: rising, then more rapidly
Visibility: 4 miles, fog
6-hr Max temp: 39F
6-hr Min temp: 37F
6-hr Precip:  0.22 ins
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E8 BKN 14 OVC 4L-F 111/37/37/0221G37/986/ PK WND 0338/08/
8/7// 53012 6022 10039 20037


SUMMARY FOR SUNDAY, APRIL 26, 2020 

TEMPERATURE (DEGREES F)
MAX.....51   NORMAL.....60
MIN.....38   NORMAL.....42
MEAN....45   NORMAL.....51

DEPARTURE FROM 30-YEAR NORMAL................... -6
TOTAL DEPARTURE FOR THE MONTH...................-64 [-2.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............20  DEPARTURE........+6
TOTAL HEATING UNITS FOR THE MONTH..............559  DEPARTURE.......+62
TOTAL HEATING UNITS FOR THE SEASON............5432  DEPARTURE......-549
TOTAL HEATING UNITS LAST SEASON TO DATE.......5823  DEPARTURE......-391

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................51 NE  AT  10:11 P.M.  
                   AERO.........................50 NE  AT  10:04 P.M  
                   ASOS.........................53 NE  AT  11:31 P.M. 
                   DAVIS........................50 E   AT  11:10 P.M. RMY 50
FASTEST MILE FOR YESTERDAY......................35 NE  AT  10:03 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................35 NE  AT  10:04 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................36 NE  AT  10:04 P.M.
AVERAGE WIND SPEED AND DIRECTION................16.2 E               
                   ASOS.........................15.6
                   DAVIS........................16.1 E [085 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.78  DEPARTURE......+0.65
                         ASOS..............0.79
TOTAL PRECIPITATION FOR THE MONTH..........7.12  DEPARTURE......+3.11
                         ASOS..............7.31
TOTAL PRECIPITATION FOR THE YEAR..........16.45  DEPARTURE......-1.56
                         ASOS.............17.04

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE....... 0.0
TOTAL SNOWFALL FOR THE MONTH................4.3  DEPARTURE.......+1.4
TOTAL SNOWFALL FOR THE SEASON..............31.9  DEPARTURE......-30.7

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 The low since midnight is 37F, daily normal minimum is 42F 

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

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

RECORDS FOR APRIL 27
HIGH 93 IN 1990
LOW 28 IN 1919
PRECIP 1.89 IN 1979
SNOWFALL 2.7 IN. IN 1993
PEAK GUST 65e MPH N IN 1941

RECORDS FOR APRIL 28
HIGH 92 IN 1990, 2009
LOW 26 IN 1947
PRECIP 2.41 IN 1904
SNOWFALL 10.0 IN. IN 1987
PEAK GUST 69 MPH NE 1967

TODAY'S REPORT PREPARED BY: Matt Douglas