Thursday, April 2, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 2, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

AN OVERCAST DAY WITH LIGHT RAIN AND STRENGTHENING
WIND THROUGHOUT….

Today there was some light rain in the morning hours, with
0.05 inches falling by the 7 A.M. observation. The
rain continued, leaving an additional 0.02 inches in
the gauge by 1 P.M. Wind was on the increase, with a
gust of almost 40 mph around 2 P.M. Visibility was
limited by a distant fog, only reaching 35 miles during
the late morning hours. Pressure has continued a gradual
downward trend signifying the much needed rainfall. The
observatory is currently 4.79 inches below normal on the
season (based on a running total and average).

Our high temperature so far today is 46F, which is 4 degrees
lower than our daily normal high temperature of 50F. The low
since midnight is 35F, which is 2 degrees above the daily
normal low of 33F.

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: Overcast stratocumulus, very light rain
Temperature: 37F; Dew Point: 32F; Relative Humidity: 82%
Wind: NW at 15G22 kts
Sea-level pressure: 29.58 ins. Hg: falling unsteadily
Visibility: 15 miles, distant fog
6-hr Max temp: 38F
6-hr Min temp: 35F
24-hr Precip:  0.05 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E35 OVC 15 017/37/32/3115G22/958/ DSNT FG ALQDS
R-CTD PCPN VRY LGT/ 8/4// 70005 56006 10038 20035

10 A.M.
Weather: Overcast stratocumulus, very light rain
Temperature: 43F; Dew Point: 36F; Relative Humidity: 75%
Wind: NW at 12G24 kts
Sea-level pressure: 29.53 ins. Hg: falling steadily
Visibility: 35 miles, distant fog
3-hr Precip:  Trace
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E35 OVC 35 003/43/36/3312G24/953/ DSNT FG ALQDS
R-CTD PCPN VRY LGT/ 8/4// 600// 58014

1 P.M.
Weather: Overcast stratocumulus, light rain
Temperature: 43F; Dew Point: 38F; Relative Humidity: 82%
Wind: NW at 17G26 kts, Peak wind: 32 MPH (28 kts) NW at
12:16 P.M.
Sea-level pressure: 29.49 ins. Hg: falling, then more
rapidly
Visibility: 15 miles, distant fog
6-hr Max temp: 46F
6-hr Min temp: 37F
6-hr Precip:  0.02 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E35 OVC 15 991/43/38/3317G26/949/ DSNT FG ALQDS
R-CTD PK WND 3528/16/ 8/4// 6002/ 56012 10046 20037

SUMMARY FOR WEDNESDAY, APRIL 1, 2020

TEMPERATURE (DEGREES F)
MAX…..42   NORMAL…..50
MIN…..28   NORMAL…..32
MEAN….35   NORMAL…..41

DEPARTURE FROM 30-YEAR NORMAL………………..-6
TOTAL DEPARTURE FOR THE MONTH………………..-6 [-6.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………30  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE MONTH……………30  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE SEASON…………4903  DEPARTURE……-605
TOTAL HEATING UNITS LAST SEASON TO DATE…….5432  DEPARTURE……-529

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..28 NE  AT  8:12 A.M.
AERO…………………….28 NE  AT  8:12 A.M
ASOS…………………….29 N   AT 10:52 P.M.
DAVIS……………………28 NNE AT 10:51 P.M. RMY 30
FASTEST MILE FOR YESTERDAY………………….18 NE  AT  8:12 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 N   AT 11:17 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 NNE AT  8:11 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.6 N
ASOS…………………..10.6
DAVIS………………….10.9 NNE [026 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05  DEPARTURE……-0.12
ASOS…………..0.04
TOTAL PRECIPITATION FOR THE MONTH……….0.05  DEPARTURE……-0.12
ASOS…………..0.04
TOTAL PRECIPITATION FOR THE YEAR………..9.38  DEPARTURE……-4.79
ASOS…………..9.77

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.2
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE…….-0.2
TOTAL SNOWFALL FOR THE SEASON…………..27.6  DEPARTURE……-32.3

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 The low since midnight is 35F, daily normal minimum is 33F

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

RECORDS FOR APRIL 2
HIGH 77 IN 1967
LOW 14 IN 1919
PRECIP 1.83 IN. IN 1970
SNOWFALL 13.0 IN. IN 1887
PEAK GUST 76 MPH SSW IN 1970

RECORDS FOR APRIL 3
HIGH 76 IN 1892
LOW 16 IN 1894
PRECIP 2.18 IN. IN 1990
SNOWFALL 8.0 IN. IN 1915
PEAK GUST 83e MPH NW IN 1977 [RECORD FOR MONTH]

TODAY’S REPORT PREPARED BY: Benjamin Turner