Tuesday, May 3, 2022

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

TUESDAY, MAY 3, 2022
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0437E
SUNSET:  1846E

MUCH NEEDED RAINFALL OVERNIGHT, MAINLY CLOUDY AND COOL TODAY….

Overnight rain amounted to 0.44″ of much needed water here
on the Hill. Despite the drink of water, we still have a
deficit for the year to date of 2.31″.

Drizzle came to an end this morning, with skies remaining
overcast into early afternoon. However breaks have developed
as some drier air works inland from the ocean. With the
easterly wind, temperatures have remained on the cool side
with readings slowly rising into the low to mid 50s early
this afternoon, which is around 8-10 degrees below the normal
high for today’s date!

As mentioned, the wind has been easterly, coming in off the
chilly ocean. Speeds have been mainly light with the average
for the day around 10mph so far.

Visibility was limited early this morning to 1/4 mile or less
due to dense fog, but has improved this afternoon to around
40 miles.

The high so far today is 55F, which is 8 degrees below the
normal maximum of 63F. The low since midnight is 43F, which
is 1 degree below the normal minimum of 44F.

————————————————————–

PRELIMINARY STATS FOR APRIL 2022

TEMPERATURE, Deg. F
Avg. Max. 57.5 [+1.2] Avg. Min. 38.7 [+0.8] Mean      48.1 [+1.0] 24-hour corrected mean: 47.3
Max. for month: 71F on the 13th
Min. for month: 32F on the 18th

HEATING DEGREE DAYS
Total heating units:    501 [ -39] Total for the season:  5364 [-523] Total for last season: 5341

PRECIPITATION, Inches
Total: 2.97 [-1.79] Greatest in 24 hrs: 0.96 on the 19th

SNOWFALL, Inches
Total: TRACE [-2.8] Greatest in 24 hrs: TRACE on the 17th

WIND, mph
Avg. uncorrected wind speed: 12.5 mph
Avg. corrected wind speed:   12.9 mph
Prevailing wind direction:   NW [20%] Peak gust and direction:  56 WNW on the 1st

SUNSHINE:
Campbell-Stokes card minutes: 13032 of a possible 23250, or 56%
Astronomical total minutes: 13505 of a possible 24106, or 56%

————————————————————–

Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft, very light drizzle
Temperature: 44F; Dew Point: 44F; Relative Humidity: 100%
Wind: NE @ 7 kts
Sea-level pressure: 1022.5 mb; 30.19 in. Hg: Rising, then more rapidly
Visibility: 1/4 mile, fog
6-hr Max temp: 44F
6-hr Min temp: 43F
24-hr Precip:  0.44 ins.
BHO SA 1155 X W2 1/4L-F 225/44/44/0507/019/ PCPN VRY LGT/
8//// 53019 6011/ 70044 10044 20043

10 A.M.
Weather: Overcast stratus
Temperature: 47F; Dew Point: 45F; Relative Humidity: 93%
Wind: ENE @ 8 kts
Sea-level pressure: 1023.7 mb; 30.23 in Hg: rising, then more rapidly
Visibility: 30 miles, thin fog
3-hr Precip: Trace
BHO SA 1455 E10 OVC 30 237/47/45/0608/023/ THN F ALQDS/ 8/6//
53012 6000/

1 P.M.
Weather: Broken stratocumulus, broken stratocumulus/lenticularis
Temperature: 54F, Dew point: 42F; Relative Humidity: 63%
Wind: ENE @ 7 kts
Sea-level pressure: 1023.2 mb; 30.22 in Hg: falling, then rising
Visibility: 40 miles, hazy
6-hr Max temp: 55F
6-hr Min temp: 44F
6-hr Precip:  Trace
BHO SA 1755 E20 BKN 35 BKN 40 232/54/42/0707/022/ HAZY/ 8/500
55005 6000/ 10055 20044

————————————————————–

SUMMARY FOR MONDAY, MAY 2, 2022

TEMPERATURE (DEGREES F)
MAX…….58     NORMAL…..63
MIN…….42     NORMAL…..44
MEAN……50     NORMAL…..54

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…….-4
TOTAL DEPARTURE FOR THE MONTH……………….-2 [-1.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY………….15  DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH………….25  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE SEASON……….5389  DEPARTURE……-522
TOTAL HEATING UNITS LAST SEASON TO DATE…..5359  DEPARTURE…….+30

COOLING DEGREE DAYS (SEASON: JAN 2022 THRU DEC 2022)
TOTAL COOLING UNITS FOR YESTERDAY…………..0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………..0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE SEASON………….0  DEPARTURE……..-4
TOTAL COOLING UNITS LAST SEASON TO DATE……..0  DEPARTURE………0

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….21 NE  @ 10:22 P.M.
AEROVANE……………….19 NE  @ 10:22 P.M.
VECTOR #2 (Instantaneous)..22     @  9:44 P.M.
DAVIS #2 ………………21 S   @  2:04 P.M.
RMY #2 (Instantaneous)…..20 S   @  2:04 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 SE  @  4:34 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16     @  4:34 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 SE  @  4:34 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 SE  @  4:34 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY #1 AVERAGE……OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….. 8.6 SE [207 total miles] VECTOR #2……………… 9.2
DAVIS #2………………. 9.0 SE
RMY #2………………… 9.2 SE
RMY #1……….OUT OF SERVICE D/T RENOVATIONS
ASOS…………OUT OF SERVICE D/T RENOVATIONS
VECTOR #1…….OUT OF SERVICE D/T RENOVATIONS
DAVIS #1……..OUT OF SERVICE D/T RENOVATIONS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.44  DEPARTURE…..+0.32
TOTAL PRECIPITATION FOR THE MONTH………….0.44  DEPARTURE…..+0.19
TOTAL PRECIPITATION FOR THE YEAR………….16.72  DEPARTURE…..-2.31

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

4/01  57/35/46/+5/0.41/0.0/183/24         56 WNW AERO 55 WNW RMY 58
4/02  52/34/43/+2/0.00/0.0/697/91         45 WNW AERO 43 WNW RMY 47
4/03  51/36/44/+2/0.03/0.0/215/28         23 NE  AERO 18 NE  RMY 23
4/04  56/35/46/+4/0.02/0.0/610/79         35 NW  AERO 30 NW  RMY 34
4/05  62/37/50/+7/0.00/0.0/698/90         25 SSW AERO 24 S   RMY 25
4/06  44/39/42/-1/0.22/0.0/000/00         33 ENE AERO 32 E   RMY 34
4/07  52/38/45/+1/0.06/0.0/000/00         50 ESE AERO 50 ESE RMY 53
4/08  61/42/52/+8/0.24/0.0/470/60         45 ESE AERO 45 SE  RMY 47 TSTM
4/09  59/39/49/+5/0.10/0.0/291/37         40 S   AERO 40 S   RMY 43
4/10  55/35/45/0/T/0.0/560/71             35 NW  AERO 32 NW  RMY 34
4/11  62/35/49/+4/T/0.0/728/92            31 NNW AERO 30 NNW RMY 31
4/12  68/46/57/+11/0.06/0.0/349/44        32 W   AERO 30 W   RMY 31
4/13  71/47/59/+13/0.00/0.0/670/84        33 S   AERO 31 S   RMY 35
4/14  50/43/47/0/0.16/0.0/000/00          19 N   AERO 18 N   RMY 18
4/15  66/43/55/+8/T/0.0/691/86            37 S   AERO 37 S   RMY 39
4/16  70/40/55/+8/0.40/0.0/314/39         42 S   AERO 53 SSW RMY 45
4/17  48/36/42/-6/0.01/T/461/57           38 N   AERO 36 N   RMY 39
4/18  55/32/44/-4/0.00/0.0/616/76         35 E   AERO 30 E   RMY 34
4/19  55/39/47/-2/0.96/0.0/325/40         55 S   AERO 53 S   RMY 58
4/20  56/37/47/-2/0.00/0.0/808/99         40 WNW AERO 37 WNW RMY 41
4/21  60/40/50/0/T/0.0/541/66             45 SSW AERO 41 SSW RMY 47
4/22  65/46/56/+6/0.00/0.0/699/85         39 WNW AERO 35 WNW RMY 39
4/23  66/40/53/+3/0.00/0.0/577/70         24 NW  AERO 22 W   RMY 25
4/24  50/40/45/-6/T/0.0/165/20            29 ENE AERO 26 ENE RMY 30
4/25  59/41/50/-1/0.00/0.0/464/56         22 S   AERO 21 S   RMY 23
4/26  54/42/48/-4/0.24/0.0/000/00         20 SSW AERO 18 S   RMY 21
4/27  56/39/48/-4/0.06/0.0/350/42         48 NW  AERO 47 NW  RMY 48
4/28  53/35/44/-8/0.00/0.0/669/80         45 NNW AERO 45 NW  RMY 46
4/29  55/35/45/-8/0.00/0.0/664/79         40 NNW AERO 39 NNW RMY 39
4/30  58/34/46/-7/0.00/0.0/690/82         24 NNW AERO 23 NNW RMY 24

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

5/01  69/40/55/+2/0.00/…/..             25 SSE AERO 25 SSE RMY 27
5/02  58/42/50/-4/0.21/…/..             21 NE  AERO 19 NE  RMY 20

5/03  The low since midnight is 43F, the daily normal low is 44F

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

RECORDS FOR MAY 3
HIGH 92F IN 2001
LOW 31F IN 1888
PRECIP 2.25 INS IN 1900
SNOWFALL TRACE IN 1908, 1985
PEAK GUST 71 MPH W IN 2002

RECORDS FOR MAY 4
HIGH 90F IN 2001
LOW 27F IN 1911 (RECORD FOR MAY)
PRECIP 1.67 INCHES IN 1893
SNOWFALL 0.1 INCHES IN 1920
PEAK GUST 60 MPH NW IN 1966

TODAY’S REPORT PREPARED BY: Matt Douglas