Tuesday, July 14, 2020
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, JULY 14, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
A BIT LESS WARM TODAY, BUT STILL HUMID…
A thunderstorm developed over the Boston area
this morning and moved offshore, however the
outflow from this storm helped to develop and
maintain a sea-breeze today which has helped to
keep temperatures a bit cooler.
Despite the cooler temperatures, dew points have
remained in the mid to upper 60s, thus keeping
the humid feel in the air.
So far we haven’t had a thunderstorm here at
Blue Hill, but we have observed quite a few of
them all around us through the day. This has
afforded us some pretty neat cloud observing,
including a couple of cumulonimbus with anvils!
The high so far today is 78 degrees, this is
3 degrees below the daily normal high of 81F.
The low since midnight is 66F, which is 3
degrees above the daily normal low of 63F.
PRELIMINARY STATS FOR JUNE 2020
TEMPERATURE, Deg. F
Avg. Max. 78.0 [+3.0]
Avg. Min. 59.1 [+2.0]
Mean 68.6 [+2.5]
24-hour corrected mean: 67.5
Max. for month: 90F on the 20th
Min. for month: 42F on the 1st
HEATING DEGREE DAYS
Total heating units: 40 [-33]
Total for the season: 5852 [-402]
Total for last season: 6254
COOLING DEGREE DAYS
Total cooling units: 152 [+47]
Total for the season: 184 [+55]
Total for last season: 89
PRECIPITATION, Inches
Total: 7.56 [+3.25]
Greatest in 24 hrs: 4.71 inches on the 28th-29th
WIND, mph
Avg. uncorrected wind speed: 9.1 mph
Avg. corrected wind speed: 9.8 mph
Prevailing wind direction: S [15%]
Peak gust and direction: 55 SW on the 6th
SUNSHINE:
Campbell-Stokes card minutes: 15996 minutes of a possible 26376 or 61%
Astronomical total minutes: 16650 minutes of a possible 27422 or 61%
Today’s Observations:
7 A.M.
Weather: Broken Stratocumulus, broken Altocumulus/Altocumulus Castellanus,
cumulonimbus distant NNW-N
Temperature: 71F; Dew Point: 68F; Relative Humidity: 91%
Wind: N at 7 kts
Sea-level pressure: 29.88 ins. Hg: rising unsteadily
Visibility: 25 miles, thin fog
6-hr Max temp: 71F
6-hr Min temp: 66F
24-hr Precip: 0.23 ins.
BHO SA 1155 E40 BKN 100 BKN 25 120/71/68/3607/988/ CB DSNT NNW-N
THN F ALQDS/ 8/380 52014 70023 10071 20066
10 A.M.
Weather: Broken cumulus, broken altocumulus castellanus,
cumulonimbus in the vicinity N, cumulonimbus distant W-NW
Temperature: 76F; Dew Point: 67F; Relative Humidity: 74%
Wind: N at 7 kts
Sea-level pressure: 29.92 ins. Hg: rising, then more slowly
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E30 BKN 50 BKN 60 133/76/67/3607/992/ TRW N-NNE MVG E
CB VCTY N CB DSNT W-NW/ 8/980 51013
1 P.M.
Weather: Broken cumulus, broken altocumulus/altocumulus castellanus,
broken dense cirrus, cumulonimbus distant SSW-SW and distant W-NW
Temperature: 78F; Dew Point: 65F; Relative Humidity: 65%
Wind: NE at 6 kts, wind direction N variable E
Sea-level pressure: 29.95 ins. Hg: rising, then more slowly
Visibility: 50 miles
6-hr Max temp: 78F
6-hr Min temp: 71F
6-hr Precip: 0.00 ins.
BHO SA 1755 E30 BKN 110 BKN 200 BKN 50 143/78/65/0406/995/
CB DSNT SSW-SW AND DSNT W-NW WND 36V08/ 8/983 51010 10078 20071
SUMMARY FOR MONDAY, JULY 13, 2020
TEMPERATURE (DEGREES F)
MAX…..82 NORMAL…..81
MIN…..69 NORMAL…..63
MEAN….76 NORMAL…..72
DEPARTURE FROM 30-YEAR NORMAL…………….. +4
TOTAL DEPARTURE FOR THE MONTH…………….. +26 [+1.8 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..11 DEPARTURE……. +4
TOTAL COOLING UNITS FOR THE MONTH…………….108 DEPARTURE…….+23
TOTAL COOLING UNITS FOR THE SEASON……………292 DEPARTURE…….+78
TOTAL COOLING UNITS LAST SEASON TO DATE……….221 DEPARTURE…….+71
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 SSE AT 12:21 P.M.
AERO…………………….31 SSE AT 12:23 P.M.
ASOS…………………….28 SSE AT 12:20 P.M.
DAVIS……………………31 SSE AT 12:20 P.M RMY 30
FASTEST MILE FOR YESTERDAY………………….23 SSE AT 12:21 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 SSE AT 12:21 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………23 SSE AT 12:20 P.M.
AVERAGE WIND SPEED AND DIRECTION………….. 8.3 WSW
ASOS………………….. 8.8
DAVIS…………………. 8.3 SW [218 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.23 DEPARTURE……+0.09
ASOS…………..0.22
TOTAL PRECIPITATION FOR THE MONTH……….0.83 DEPARTURE……-0.70
ASOS…………..0.82
TOTAL PRECIPITATION FOR THE YEAR……….28.18 DEPARTURE……-0.32
ASOS………….28.83
PRELIMINARY CLIMATE SUMMARY FOR JUNE 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
06/01 64/42/53/-9/T/0.0/724/80 28 WNW AERO 29 WNW RMY 28
06/02 72/45/59/-3/…./0.0/689/76 28 W AERO 27 W RMY 28
06/03 79/55/67/+5/T/0.0/400/44 29 W AERO 28 W RMY 26
06/04 87/62/75/+12/…./0.0/673/74 26 W AERO 25 S RMY N/A
06/05 80/65/73/+10/…./0.0/300/33 28 SSW AERO 28 SSW RMY N/A TSTM
06/06 86/57/72/+9/…./0.0/301/33 55 SW AERO 59 SW RMY 59 TSTM
06/07 68/54/61/-3/0.00/0.0/255/28 24 NW AERO 24 NW RMY N/A
06/08 77/51/64/0/0.00/0.0/866/95 25 W AERO 24 W RMY 25
06/09 77/60/69/+5/T/0.0/110/12 23 E AERO 21 E RMY N/A
06/10 70/58/64/-1/T/0.0/658/72 25 E AERO 24 E RMY N/A
06/11 71/64/68/+3/0.62/0.0/165/18 40 S AERO 40 S RMY 42
06/12 82/63/73/+8/0.00/0.0/705/77 26 W AERO 25 W RMY 27
06/13 71/53/62/-3/0.00/0.0/669/73 21 WNW AERO 20 WNW RMY N/A
06/14 67/49/58/-8/0.00/0.0/852/93 21 E AERO 21 ENE RMY 21
06/15 67/53/60/-6/5/0/0.0/696/76 21 NE AERO 16 ENE RMY 20
06/16 73/54/64/-2/0.00/0.0/889/97 18 E AERO 18 E RMY 18
06/17 78/57/68/+1/0.00/0.0/889/97 20 S AERO 20 S RMY 20
06/18 86/59/73/+6/0.00/0.0/715/78 22 S AERO 22 SSW RMY 22
06/19 86/66/76/+9/0.00/0.0/789/86 22 S AERO 22 S RMY 21
06/20 90/65/78/+10/0.00/0.0/834/91 22 S AERO 21 S RMY 21
06/21 90/66/78/+10/0.83/0.0/514/56 33 ESE AERO 35 ESE RMY 33 TSTM
06/22 77/65/71/+3/0.00/0.0/761/83 15 E AERO 17 S RMY 14
06/23 85/65/75/+7/0.00/0.0/431/47 27 S AERO 24 S RMY 26
06/24 84/66/75/+6/0.00/0.0/348/38 25 S AERO 24 S RMY 25
06/25 84/63/74/+5/0.00/0.0/806/88 29 W AERO 29 W RMY 29
06/26 83/65/74/+5/0.02/0.0/769/84 25 S AERO 25 S RMY 27
06/27 82/65/74/+5/0.05/0.0/330/36 21 S AERO 20 S RMY 20
06/28 84/62/73/+3/3.27/0.0/421/46 35 W AERO 33 N RMY 37 TSTM
06/29 71/61/66/-4/…./0.0/064/07 18 NE AERO 18 NE RMY 18 TSTM
06/30 68/62/65/-5/…./…/027/03 14 ENE AERO 14 ENE RMY 13
Record rainfall on the 28th of 3.27″. Old record 2.09″ in 1938
PRELIMINARY CLIMATE SUMMARY FOR JULY 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
07/01 76/63/70/0/0.00/228/25 16 E AERO 14 E RMY 14 TSTM
07/02 86/61/74/4/0.00/803/88 30 WSW AERO 25 WSW RMY 33
07/03 73/60/67/-4/0.00/091/10 30 NE AERO 28 NE RMY 30
07/04 79/60/70/-1/0.00/565/62 16 S AERO 16 S RMY 16
07/05 83/63/73/+2/0.54/373/41 24 NW AERO 30 NW RMY 26 TSTM
07/06 73/60/67/-4/0.00/…/.. 20 ENE AERO 16 NNE RMY 18
07/07 78/60/69/-2/0.00/…/.. 25 S AERO 25 S RMY 26
07/08 83/64/74/+2/0.00/…/.. 32 SSW AERO 32 SSW RMY 32
07/09 89/70/80/+8/0.00/…/. 24 S AERO 23 S RMY 22
07/10 83/70/77/+5/0.05/…/.. 30 SSE AERO 32 SSE RMY N/A
07/11 85/70/78/+6/0.00/…/.. 39 S AERO 39 S RMY 38
07/12 86/70/78/+6/0.00/…/.. 28 WSW AERO 28 WSW RMY 29
07/13 82/69/76/+4/0.23/…/.. 30 SSE AERO 31 SSE RMY 30 TSTM
07/14 The low since midnight is 66F, the daily normal low is 63F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JULY 14
HIGH 98F IN 1952
LOW 51F IN 1895, 1937
PRECIP 1.97 INS IN 1960
WIND 110e MPH NW IN 1942 [THUNDERSTORM GUST; RECORD FOR MONTH]
RECORDS FOR JULY 15
HIGH 94F IN 1995
LOW 50F IN 1929, 1930
PRECIP 1.64 INS IN 1896
WIND 71 MPH WNW IN 2002
TODAY’S REPORT PREPARED BY: Matt Douglas
