Wednesday, May 31, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, MAY 31, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0411E
SUNSET: 1914E
ABUNDANT SUNSHINE ONCE AGAIN TODAY AND MUCH WARMER WITH LIGHT WIND….
Skies have once again been clear all day with only some high thin
cirrus clouds being visible well off to the south. A bit of left-
over smoke is visible aloft as well, but not nearly as bad as it
was yesterday.
Temperatures have warmed considerably from morning lows in the
mid 40s. Readings have reached the upper 70s and low 80s early
this afternoon. Humidity levels remain low however with the dew-
point hanging out in the mid 40s.
The wind has been rather light today with an average speed of only
around 7mph. The highest gust so far today is a meager 16mph! This
is very similar to yesterday.
Visibility has been gradually improving through the day, starting
off at only around 20 miles in thin fog early this morning, but
improving to 40 miles by early this afternoon.
It should be noted that the extended period of dry weather has
been quite notable. For the month of May to date, we’ve only seen
10 days with measurable rainfall. Of those 10, only 2 had more
than a tenth of an inch, one of which being the big rain event
on the 20th. 81% of the total rainfall for the month fell in that
one storm, with more than half of that falling in a 2 hour period!
The maximum temperature so far today is 79F, which is 8F degrees
above the normal high of 71F. The minimum temperature so far since
midnight is 45F, which is 8 degrees below the normal low of 53F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus/stratus fractus distant NE-SE-SW-NW,
few cirrus distant ESE-S, thin smoke layer aloft distant NE-SE
Temperature: 51F; Dew Point: 46F; Relative Humidity: 84%
Wind: S @ 5 kts, wind light
Sea-level pressure: 1024.5 mb; 30.25 in. Hg: rising, then more slowly
Visibility: 20 miles, 15 miles SE-SW-WNW
6-hr Max temp: 51F
6-hr Min temp: 45F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 20 245/51/46/1805/025/ FEW SC/STFRA DSNT NE-SE-SW-NW
FEW CI DSNT ESE-S F DSNT NE-SE-SW-NW THN K LYR ALF DSNT NE-SE
VSBY 15 SE-SW-WNW WND LGT/ 8/701 51010 10051 20045
10 A.M.
Weather: Clear, few cirrus distant ESE-S, thin smoke layer all
quadrants and aloft NE-SE-SW
Temperature: 67F; Dew Point: 45F; Relative Humidity: 45%
Wind: SSW @ 6 kts, wind light
Sea-level pressure: 1024.6 mb; 30.26 in. Hg: rising, then falling
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 30 246/67/45/2006/026/ FEW CI DSNT ESE-S
THN K LYR ALQDS AND ALF NE-SE-SW HAZY WND LGT/ 8/001 50001
1 P.M.
Weather: Clear, few cirrus distant SE-SSW, thin smoke layer aloft
all quadrants
Temperature: 76F; Dew Point: 44F; Relative Humidity: 31%
Wind: S @ 5 kts, wind light and variable
Sea-level pressure: 1023.0 mb; 30.21 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 77F
6-hr Min temp: 51F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 40 230/76/44/1805/021/ FEW CI DSNT SE-SSW
THN K LYR ALF ALQDS HAZY WND L/V/ 8/001 58016 10077 20051
————————————————————–
SUMMARY FOR TUESDAY, MAY 30, 2023
TEMPERATURE (DEGREES F)
MAX…….71 NORMAL…..70
MIN…….46 NORMAL…..52
MEAN……59 NORMAL…..61
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………-2
TOTAL DEPARTURE FOR THE MONTH………………..+27 [+0.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….6 DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH…………..213 DEPARTURE…….-39
TOTAL HEATING UNITS FOR THE SEASON…………5184 DEPARTURE……-955
TOTAL HEATING UNITS LAST SEASON TO DATE…….5566 DEPARTURE……-382
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH……………22 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE SEASON…………..31 DEPARTURE……..+5
TOTAL COOLING UNITS LAST SEASON TO DATE………58 DEPARTURE…….-27
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated
F420C (Official)……….E21 SSW @ 11:02 P.M.
VECTOR #1 (1-Sec)……….21 SSW @ 11:02 P.M.
VECTOR #2 (1-Sec)……….21 SSE @ 05:16 P.M.
DAVIS #1……………….22 S @ 11:08 P.M.
DAVIS #2 ………………24 S @ 07:03 P.M.
RMY #1 (Instantaneous)…..21 S @ 10:53 P.M.
RMY #2 (Instantaneous)…..22 SSE @ 05:16 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……21 @ 11:02 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 S @ 10:52 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 @ 10:50 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 10:49 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 S @ 10:50 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 S @ 10:49 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 S @ 10:54 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 S @ 10:49 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16 @ 10:54 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.7 S [185 total miles]
VECTOR #1……………….8.1
VECTOR #2……………….8.4
DAVIS #1………………..7.9 SE
DAVIS #2………………..8.1 SSE
RMY #1………………….7.9 SE
RMY #2………………….8.3 SE
RICHARDS (C5C)…………..8.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..2.55 DEPARTURE…..-1.12
TOTAL PRECIPITATION FOR THE YEAR…………..20.75 DEPARTURE…..-1.70
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.8
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY: R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
5/1 63/45/54/+1/0.04/0.0/540/64 44 SSE VEC1 46 SSE RMY 48
5/2 57/43/50/-4/0.22/0.0/144/17 33 S VEC1 34 S RMY 35
5/3 55/42/49/-5/0.01/0.0/093/11 25 E VEC1 25 E RMY 25
5/4 45/40/43/-11/0.07/0.0/009/01 29 NE VEC1 29 NE RMY 29
5/5 59/43/51/-4/0.07/0.0/367/43 18 NE VEC1 19 NE RMY 19
5/6 74/43/59/+4/0.00/0.0/847/99 25 NW VEC1 26 NW RMY 26
5/7 78/52/65/+10/0.01/0.0/789/92 26 WNW VEC1 27 W RMY 28
5/8 74/49/62/+7/0.03/0.0/800/93 32 NW VEC1 33 NW RMY 35
5/9 60/45/53/-3/0.00/0.0/819/95 24 NE VEC1 25 NE RMY 25
5/10 72/51/62/+6/0.00/0.0/830/96 25 WSW VEC1 26 WSW RMY 26
5/11 81/53/67/+11/T/0.0/729/84 30 W VEC1 30 W RMY 30
5/12 84/57/71/+14/T/0.0/687/79 31 WNW VEC1 35 WNW RMY 34
5/13 81/58/70/+13/0/0.0/715/82 28 NNW VEC1 30 NNW RMY 35
5/14 66/47/57/0/0.00/0.0/822/94 28 NNW VEC1 29 NNW RMY 31
5/15 72/45/59/+2/0.00/0.0/675/77 33 W VEC1 35 W RMY 34
5/16 80/55/68/+10/0.00/0.0/500/57 38 SW VEC1 39 SW RMY 41
5/17 62/37/50/-8/0.00/0.0/836/95 36 NNW VEC1 37 NNW RMY 40
5/18 64/34/49/-9/0.00/0.0/847/96 26 SSW VEC1 28 SSW RMY 28
5/19 68/42/55/-3/0.00/0.0/751/85 36 SSW VEC1 36 SSW RMY 34
5/20 65/51/58/-1/1.97/0.0/018/02 38 S VEC1 39 S RMY 39
5/21 73/55/64/+5/0.09/0.0/533/60 29 SSW VEC1 30 SSW RMY 31
5/22 59/46/53/-6/0.00/0.0/782/88 36 ENE VEC1 38 ENE RMY 39
5/23 65/45/55/-4/0.00/0.0/…/.. 17 SE VEC1 18 SE RMY 18
5/24 75/44/60/0/0.04/0.0/…/.. 35 NW VEC1 36 NW RMY 38
5/25 67/47/57/-3/0.00/0.0/…/.. 25 NNW VEC1 25 NNW RMY 26
5/26 70/44/57/-3/0.00/0.0/…/.. 20 N VEC1 21 N RMY 22
5/27 80/48/64/+4/0.00/0.0/…/.. 23 SSW VEC1 23 SSW RMY 23
5/28 86/56/71/+10/0.00/0.0/…/.. 23 SW VEC1 24 SW RMY 25
5/29 65/48/57/-4/0.00/0.0/…/.. 43 ENE VEC1 44 ENE RMY 45
5/30 71/46/59/-2/0.00/0.0/…/.. 21 SSW VEC1 21 SSW RMY 21
5/31 The low since midnight is 45F, the daily normal low is 53F
DAILY RECORDS
05/18/2023: NEW RECORD LOW MINIMUM TEMPERATURE OF 34F,
THIS BEATS THE OLD RECORD OF 35F SET IN 2002
05/20/2023: NEW RECORD DAILY PRECIPITATION OF 1.97 INCHES,
THIS BEATS THE OLD RECORD OF 1.65 INCHES SET IN 1969
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MAY 31
HIGH 92F IN 1944,1987,2013
LOW 35F IN 1961
PRECIP 5.02 INS 1984 (RECORD FOR MAY)
PEAK GUST 54e MPH WNW IN 1945
RECORDS FOR JUNE 1
HIGH 90F IN 1937,2013
LOW 36F IN 1945 [Record for month]
PRECIP 2.28 INS IN 1992
PEAK GUST 51e MPH SE IN 1952
TODAY’S REPORT PREPARED BY: Matt Douglas
