Monday, April 6, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, APRIL 6, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

PLENTY OF SUNSHINE AND MILD TEMPERATURES TODAY….

Brilliant! That describes today in a single word. Skies
have been mainly clear except for some high thin cirrus
clouds passing through and decorating the sky. Visibility
has been excellent at 70 to 80 miles all day.

Temperatures have risen into the upper 50s, but with
light winds and a high sun angle, it feels rather warm
out there today.

Our high temperature so far today is 58F, which is 6
degrees above our daily normal high temperature of 52F.
The low since midnight is 40F, which is 6 degrees above
the daily normal low of 34F.

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: Clear, few altocumulus castellanus distant E-S-SW,
few cirrus distant E-S-SW
Temperature: 43F; Dew Point: 33F; Relative Humidity: 67%
Wind: NW at 10G19 kts
Sea-level pressure: 30.02 ins. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 43F
6-hr Min temp: 40F
24-hr Precip: Trace
24-hr Snowfall: 0.0 ins.
BHO SA 1155 CLR 70 166/43/33/3310G19/002/ FEW ACC DSNT E-S-SW
FEW CI DSNT E-S-SW/ 8/081 51013 70000 10043 20040

10 A.M.
Weather: Scattered cirrus
Temperature: 52F; Dew Point: 25F; Relative Humidity: 34%
Wind: N at 8 kts
Sea-level pressure: 30.02 ins. Hg: rising then falling
Visibility: 80 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 300 SCT 80 166/52/25/3508/002/ 8/001 50000

1 P.M.
Weather: Broken cirrus, few small cumulus distant W-NW
Temperature: 56F; Dew Point: 15F; Relative Humidity: 19%
Wind: NW at 5 kts, wind light and variable
Sea-level pressure: 29.96 ins. Hg: falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 58F
6-hr Min temp: 43F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E300 BKN 80 145/56/15/3305/996/ FEW SML CU DSNT
W-NW WND L/V/ 8/101 58021 10058 20043

SUMMARY FOR SUNDAY, APRIL 5, 2020

TEMPERATURE (DEGREES F)
MAX…..55   NORMAL…..51
MIN…..36   NORMAL…..34
MEAN….46   NORMAL…..43

DEPARTURE FROM 30-YEAR NORMAL………………..+3
TOTAL DEPARTURE FOR THE MONTH………………..-6 [-1.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………19  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH…………..122  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE SEASON…………4995  DEPARTURE……-605
TOTAL HEATING UNITS LAST SEASON TO DATE…….5525  DEPARTURE……-530

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..22 S   AT  5:26 P.M.
AERO…………………….21 S   AT  4:53 P.M
ASOS…………………….21 S   AT  4:44 P.M.
DAVIS……………………20 S   AT  5:24 P.M. RMY 21
FASTEST MILE FOR YESTERDAY………………….14 S   AT  4:44 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 SW  AT 11:23 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14 S   AT  4:52 P.M.
AVERAGE WIND SPEED AND DIRECTION………….. 8.3 S
ASOS………………….. 9.2
DAVIS…………………. 8.1 SSW [195 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.72  DEPARTURE……+1.87
ASOS…………..2.82
TOTAL PRECIPITATION FOR THE YEAR……….12.05  DEPARTURE……-2.80
ASOS………….12.55

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…….-1.0
TOTAL SNOWFALL FOR THE SEASON…………..27.6  DEPARTURE……-33.1

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 The low since midnight is 40F, daily normal minimum is 34F

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

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

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

TODAY’S REPORT PREPARED BY: Matt Douglas