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

THURSDAY, MAY 23, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0415E
SUNSET: 1907E

CLOUDY SKIES WITH PERIODS OF SHOWERS AND THUNDERSTORMS….

So far the day has turned out to be a bit stormier than expected
with two bouts of showers and thunderstorms moving through the
area so far today. The first round came through early this
morning between 6-7am. 0.08″ of rain was left in the gauge, so
while it didn’t rain very hard or last very long, it did still
offer a bit of excitement to start the day. The second round
started just after 11am and has continued past the 1pm
observation. This round has left an additional 0.30″ of rain
in the gauge through 1pm.

Due to all the clouds and rain, the temperatures have not been
able to get as warm as predicted. We were expecting highs to
once again be in the mid to upper 80s today, however so far the
max has only reached the mid 70s, occurring this morning during
the period between the rain. The dew point spiked for a time
following the early morning rain, with readings reaching the
upper 60s for the first time this year. It definitely feels
quite humid today.

The wind has been generally steady today to this point with a
southwest to south-southwest wind averaging around 12mph. The
peak gust thus far for the day is 29mph, which occurred right
around noon time.

Visibility has been limited today to generally 20-30 miles,
however it has dropped below 6 miles during times of rainfall.

The maximum temperature so far today is 74F degrees, which is 5
degrees above the normal high of 69F. The minimum temperature
since midnight is 61F degrees, which is 11 degrees above the
normal low of 50F.

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Today’s Observations:

7 A.M.
Weather: Broken cumulonimbus, broken altocumulus castellanus,
broken altocumulus, broken cirrus, few stratus fractus distant S-WSW
Temperature: 63F; Dew Point: 61F; Relative Humidity: 94%
Wind: SW @ 10 kts
Sea-level pressure: 1011.4 mb; 29.87 in. Hg: rising, then steady
Visibility: 30 miles, 15 miles ESE-S, thin fog
6-hr Max temp: 66F
6-hr Min temp: 61F
24-hr Precip: 0.08 inches
BHO SA 1155 E40 BKN 65 BKN 110 BKN 250 BKN 30 114/63/61/2210/987/
FEW STFRA DSNT S-WSW THN F ALQDS RW-B13E44 TE50 VSBY 15 ESE-S/
8/383 51001 6008/ 70008 10066 20061

10 A.M.
Weather: Broken altocumulus castellanus, broken altocumulus/altostratus,
broken cirrocumulus, overcast cirrus, thin spots in overcast overhead
Temperature: 72F; Dew Point: 67F; Relative Humidity: 85%
Wind: SW @ 8 kts
Sea-level pressure: 1011.2 mb; 29.86 in. Hg: falling, then rising
Visibility: 20 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E70 BKN 110 BKN 200 BKN 250 OVC 20 112/72/67/2208/986/
THN SPTS IOVC OVHD SUN DMLY VSBL HAZY/ 8/089 55002

1 P.M.
Weather: Overcast nimbostratus, thunderstorm with light rain showers,
few stratus fractus all quadrants, occasional lightning in cloud and
cloud to cloud
Temperature: 65F; Dew Point: 65F; Relative Humidity: 99%
Wind: WSW @ 7 kts
Sea-level pressure: 1011.3 mb; 29.86 in. Hg: rising, then falling
Visibility: 5 miles, fog
6-hr Max temp: 74F
6-hr Min temp: 63F
6-hr Precip: 0.30 inches
BHO SA 1755 E85 OVC 5TRW-F 113/65/65/2407/986/ FEW STFRA ALQDS
OCNL LTGICCC/ 8/72/ 50001 6030/ 10074 20063

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SUMMARY FOR WEDNESDAY, MAY 22, 2024

TEMPERATURE (DEGREES F)
MAX…….88 NORMAL…..68
MIN…….56 NORMAL…..50
MEAN……72 NORMAL…..59

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………+13
TOTAL DEPARTURE FOR THE MONTH…………………….-3 [-0.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH…………..208 DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE SEASON…………5365 DEPARTURE……-726
TOTAL HEATING UNITS LAST SEASON TO DATE…….5148 DEPARTURE……+217

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….7 DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE MONTH……………11 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE SEASON…………..11 DEPARTURE……..-5
TOTAL COOLING UNITS LAST SEASON TO DATE………25 DEPARTURE…….-14

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)……….E32 SSW @ 05:03 P.M.
VECTOR #1 (1-Sec)……….32 SSW @ 05:18 P.M.
VECTOR #2 (1-Sec)……….30 S @ 05:18 P.M.
DAVIS #1……………….34 S @ 04:10 P.M.
DAVIS #2 ………………36 S @ 05:15 P.M.
RMY #1 (Instantaneous)…..33 SSW @ 05:18 P.M.
RMY #2 (Instantaneous)…..32 S @ 05:18 P.M.
MERLIN…………………29 S
RICHARDS (C5C) (Inst)……31 @ 05:03 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 SSW @ 05:22 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 @ 05:58 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 @ 05:58 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 S @ 05:58 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 S @ 05:17 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 SSW @ 05:21 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..24 SSW @ 05:58 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21 @ 05:58 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……12.9 SSW [309 total miles] VECTOR #1…………….13.0
VECTOR #2…………….13.5
DAVIS #1……………..12.6 SW
DAVIS #2……………..13.6 SW
RMY #1……………….12.8 SW
RMY #2……………….13.5 SW
RICHARDS (C5C)………..12.2

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.08 DEPARTURE…..-0.04
TOTAL PRECIPITATION FOR THE MONTH…………..3.30 DEPARTURE…..+0.68
TOTAL PRECIPITATION FOR THE YEAR (2024)…….28.26 DEPARTURE…..+6.86

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 58/50/54/0/0.26/0.0/000/00 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