Friday, May 31, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, MAY 31, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0410E
SUNSET: 1914E
A BEAUTIFUL END TO THE MONTH OF MAY WITH LOTS OF
SUNSHINE AND LOWER DEW POINTS….
Today has been one of the top days this year so far, with
slightly above seasonal temperatures and bright sunshine
but without the humidity. It has been an excellent day for
anything outdoors as the dew points are in a comfortable
range.
Yesterday’s rain set a record for us on the hill with 1.41″
of total rainfall for the day. This puts us over 2″ for the
month and a staggering +8″ for the year. It has been a wet
year, that’s for sure!
The wind has been light today with an average of about 9 mph.
Westerly flow has brought in dry air which has given us much
reprieve from the sticky conditions we were experiencing earlier
this week. Winds have gradually picked up through the late
morning and early afternoon. The peak gust so far for the day
occurred just before 1pm EST at about 23 mph.
Visibility has been in the 40-50 mile range throughout the day,
with the better visibility occurring in the early morning hours.
The maximum temperature so far today is 74F degrees, which is
3 degrees above the normal high of 71F. The minimum temperature
since midnight is 48F degrees, which is 5 degrees below the
normal low of 53F.
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Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus NNW-N-ENE, few altocumulus distant
E-SSE
Temperature: 56F; Dew Point: 46F; Relative Humidity: 69%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1019.7 mb; 30.11 in. Hg: rising unsteadily
Visibility: 50 miles
6-hr Max temp: 56F
6-hr Min temp: 48F
24-hr Precip: 0.81 inches
BHO SA 1155 CLR 50 197/56/46/3405/011/ FEW SC NNW-N-ENE FEW AC DSNT
E-SSE WND LGT/ 8/550 52019 70081 10056 20048
10 A.M.
Weather: Clear, few cumulus S-W-N, few cirrus E
Temperature: 69F; Dew Point: 43F; Relative Humidity: 38%
Wind: N @ 8 kts
Sea-level pressure: 1019.5 mb; 30.11 in. Hg: rising, then falling
Visibility: 40 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 40 195/69/43/3508/011/ FEW CU S-W-N FEW CI E/ 8/101
58002
1 P.M.
Weather: Scattered cumulus, thinly scattered cirrus
Temperature: 74F; Dew Point: 44F; Relative Humidity: 34%
Wind: NNW @ 7 kts
Sea-level pressure: 1018.1 mb; 30.06in. Hg: falling unsteadily
Visibility: 40 miles
6-hr Max temp: 74F
6-hr Min temp: 56F
6-hr Precip: 0.00 inches
BHO SA 1755 45 SCT 250 -SCT 40 181/74/44/3307/006/ 8/201 57014
10074 20056
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SUMMARY FOR THURSDAY, MAY 30, 2024
TEMPERATURE (DEGREES F)
MAX…….58 NORMAL…..70
MIN…….50 NORMAL…..52
MEAN……54 NORMAL…..61
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-7
TOTAL DEPARTURE FOR THE MONTH…………………….+46 [+1.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………11 DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE MONTH…………..219 DEPARTURE…….-33
TOTAL HEATING UNITS FOR THE SEASON…………5376 DEPARTURE……-763
TOTAL HEATING UNITS LAST SEASON TO DATE…….5194 DEPARTURE……+182
COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH……………37 DEPARTURE…….+14
TOTAL COOLING UNITS FOR THE SEASON…………..37 DEPARTURE…….+11
TOTAL COOLING UNITS LAST SEASON TO DATE………31 DEPARTURE……..+6
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)……….E33 N @ 09:14 A.M.
VECTOR #1 (1-Sec)……….33 N @ 09:05 A.M.
VECTOR #2 (1-Sec)……….34 N @ 09:20 A.M.
DAVIS #1……………….30 NNE @ 09:05 A.M.
DAVIS #2 ………………30 NE @ 09:20 A.M.
RMY #1 (Instantaneous)…..31 NNE @ 09:34 A.M.
RMY #2 (Instantaneous)…..35 N @ 09:20 A.M.
MERLIN…………………28 N
RICHARDS (C5C) (Inst)…….M
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………22 NNE @ 09:21 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 @ 09:21 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 @ 09:21 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 NNE @ 09:22 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 NNE @ 09:22 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 NNE @ 09:21 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 N @ 09:22 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……….M
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….9.2 N [221 total miles]
VECTOR #1……………..9.4
VECTOR #2……………..9.9
DAVIS #1………………9.5 NNE
DAVIS #2………………9.6 NE
RMY #1………………..9.2 N
RMY #2………………..9.7 N
RICHARDS (C5C)…………..M
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.81 DEPARTURE…..+0.68
TOTAL PRECIPITATION FOR THE MONTH…………..5.86 DEPARTURE…..+2.18
TOTAL PRECIPITATION FOR THE YEAR (2024)…….30.82 DEPARTURE…..+8.36
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 (2023-2024)……26.8 DEPARTURE…..-42.9
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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
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
5/1 53/42/48/-5/0.06/0.0/177/21 18 ESE VEC1 18 ESE RMY 18
5/2 69/44/57/+3/0.21/0.0/535/63 35 NE VEC1 36 NE RMY 35 TSTM
5/3 57/44/51/-3/0.02/0.0/408/48 24 NE VEC1 24 NE RMY 25
5/4 55/44/50/-4/0.00/0.0/589/69 22 ENE VEC1 21 NE RMY 21
5/5 51/42/47/-8/0.35/0.0/000/00 21 S VEC1 22 S RMY 21
5/6 75/46/61/+6/0.02/0.0/343/40 20 SW VEC1 18 SW RMY 20
5/7 78/55/67/+12/0.00/0.0/851/99 23 NW VEC1 24 NE RMY 23
5/8 62/49/56/+1/0.60/0.0/078/09 30 S VEC1 31 S RMY 31 TSTM
5/9 63/45/54/-2/0.00/0.0/588/68 33 NW VEC1 33 NW RMY 34
5/10 56/42/49/-7/0.00/0.0/572/66 28 ENE VEC1 27 ENE RMY 27
5/11 55/39/47/-9/0.00/0.0/617/71 26 ENE VEC1 26 NE RMY 27
5/12 60/41/51/-6/T/0.0/305/35 16 WSW VEC1 15 SW RMY 15
5/13 68/45/57/0/0.00/0.0/663/76 25 S VEC1 25 SE RMY 26
5/14 76/48/62/+5/T/0.0/718/82 33 SSW VEC1 33 SSW RMY 32
5/15 73/53/63/+6/0.46/0.0/079/09 24 ENE VEC1 24 E RMY 24
5/16 56/52/54/-4/1.02/0.0/141/16 32 ENE VEC1 32 ENE RMY 31
5/17 66/50/58/0/0.00/0.0/662/75 29 ENE VEC1 28 ENE RMY 27
5/18 58/50/54/-4/0.26/0.0/000/00 32 NE VEC1 33 NE RMY 34
5/19 53/48/51/-7/0.22/0.0/000/00 30 NE VEC1 30 NE RMY 30
5/20 65/48/57/-2/0.00/0.0/452/51 18 S VEC1 17 SSE RMY 18
5/21 84/50/67/+8/0.00/0.0/648/73 22 SSW VEC1 22 SSW RMY 22
5/22 88/56/72/+13/0.00/0.0/854/96 32 SSW VEC1 32 SSW RMY 33
5/23 75/61/68/+9/0.42/0.0/330/37 31 SSW VEC1 30 SSW RMY 31 TSTM
5/24 82/59/71/+11/0.00/0.0/876/96 38 W VEC1 38 W RMY 37
5/25 80/55/68/+8/0.00/0.0/752/84 24 S VEC1 23 SW RMY 25
5/26 79/58/69/+9/0.30/0.0/511/57 22 S VEC1 22 S RMY 22
5/27 75/61/68/+8/0.28/0.0/126/14 36 S VEC1 37 S RMY 39
5/28 80/62/71/+10/0.23/0.0/486/54 36 SSE VEC1 37 SSE RMY 36
5/29 75/57/66/+5/0.00/0.0/631/70 21 W VEC1 21 W RMY 21
5/30 58/50/54/-7/1.41/0.0/…/.. 33 N VEC1 33 N RMY 31 TSTM
5/31 The low since midnight is 48F, the daily normal low is 53F.
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MAY DAILY RECORDS TO DATE
5/30 PRECIP 1.41 INS (PREV 1.28 INS 1948)
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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: Amanda Joly
