Monday, April 10, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, APRIL 10, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0512E
SUNSET: 1820E
ANOTHER DAY WITH ABUNDANT SUNSHINE, LIGHT WIND, AND MILDER
TEMPERATURES…
Another spectacular day today as we’re in a stretch of very
fine weather for mid April. Wall to wall sunshine has been
the theme along with generally light wind and dry air. The dew-
point has been in the 20s, with temperatures into the low 60s,
the relative humidity has dropped below 30%.
As mentioned, the wind has been quite light with an average
speed of around 10mph for the day so far. The peak gust has
only been around 18mph to this point.
Visibility has been excellent today, with views of 60-80 miles.
The high so far today is 63F, which is 9F degrees above the
normal maximum of 54F. The low since midnight is 33F degrees,
which is 3 degrees below the normal minimum for the day of 36F.
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Today’s Observations:
7 A.M.
Weather: Clear, few cirrus distant SW-W
Temperature: 37F; Dew Point: 28F; Relative Humidity: 69%
Wind: WNW @ 10 kts
Sea-level pressure: 1031.5 mb; 30.46 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 37F
6-hr Min temp: 33F
24-hr Precip: 0.00
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 60 315/37/28/2910/046/ FEW CI DSNT SW-W/
8/001 51009 10037 20033
10 A.M.
Weather: Clear, few cirrus distant SSW-W
Temperature: 53F; Dew Point: 22F; Relative Humidity: 29%
Wind: WNW @ 6 kts, wind light
Sea-level pressure: 1030.6 mb; 30.43 in. Hg: falling, then more rapidly
Visibility: 70 miles
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 70 306/53/22/2906/043/ FEW CI DSNT SSW-W
WND LGT/ 8/001 58009
1 P.M.
Weather: Clear, few cirrus distant S-W
Temperature: 62F; Dew Point: 23F; Relative Humidity: 22%
Wind: WNW @ 6 kts, wind light and variable
Sea-level pressure: 1028.0 mb; 30.36 in. Hg: falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 63F
6-hr Min temp: 47F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 80 280/62/23/3006/036/ FEW CI DSNT S-W
WND L/V/ 8/001 58026 10063 20047
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SUMMARY FOR SUNDAY, APRIL 9, 2023
TEMPERATURE (DEGREES F)
MAX…….54 NORMAL…..53
MIN…….33 NORMAL…..35
MEAN……44 NORMAL…..44
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………..0
TOTAL DEPARTURE FOR THE MONTH…………………+19 [+1.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………21 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………..182 DEPARTURE…….-20
TOTAL HEATING UNITS FOR THE SEASON…………4714 DEPARTURE……-835
TOTAL HEATING UNITS LAST SEASON TO DATE…….5031 DEPARTURE……-317
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
F420C (Official)………..25 S @ 6:44 P.M.
VECTOR #1 (1-Sec)……….28 S @ 6:12 P.M.
VECTOR #2 (1-Sec)……….28 SSW @ 6:01 P.M.
DAVIS #1……………….30 S @ 7:22 P.M.
DAVIS #2 ………………32 S @ 6:44 P.M.
RMY #1 (Instantaneous)…..28 S @ 6:44 P.M.
RMY #2 (Instantaneous)…..28 SSW @ 6:02 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……27 @ 6:03 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 SSW @ 6:06 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 @ 6:45 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 @ 6:46 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 S @ 6:14 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 S @ 6:46 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 S @ 6:45 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 S @ 6:46 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19 @ 6:45 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..9.2 ENE [220 total miles]
VECTOR #1………………9.2
VECTOR #2………………9.7
DAVIS #1……………….9.3 SSE
DAVIS #2……………….9.7 SSE
RMY #1…………………9.2 E
RMY #2…………………9.5 E
RICHARDS (C5C)………….9.6
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..0.43 DEPARTURE…..-1.10
TOTAL PRECIPITATION FOR THE YEAR…………..15.04 DEPARTURE…..-0.51
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE……-1.5
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-33.5
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PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
VEC1: Vector #1 1-second gust
RMY: R.M. Young wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
4/1 60/39/50/+9/0.39/0.0/145/19 36 SW VEC1 40 SW RMY 41
4/2 50/30/40/-1/0.00/0.0/636/83 40 NNW VEC1 44 NNW RMY 45
4/3 51/28/40/-2/0.00/0.0/737/96 41 SSW VEC1 46 SSW RMY 46
4/4 62/40/51/+9/0.00/0.0/594/77 26 ENE VEC1 26 ENE RMY 27
4/5 45/37/41/-2/0.02/0.0/000/00 33 ENE VEC1 34 ENE RMY 37
4/6 62/37/50/+7/0.02/0.0/…/.. 26 NW VEC1 28 NNW RMY 29
4/7 58/36/47/+3/0.00/0.0/…/.. 45 WNW VEC1 48 WNW RMY 52
4/8 50/29/40/-4/0.00/0.0/…/.. 26 NNW VEC1 29 NNW RMY 31
4/9 54/33/44/0/0.00/0.0/…/.. 25 S VEC1 28 S RMY 28
4/10 The low since midnight is 33F, the daily normal low is 36F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 10
HIGH 83 IN 1922
LOW 20 IN 1985
PRECIP 2.40 IN. IN 1935
SNOWFALL 10.1 IN. IN 1996
PEAK GUST 66 MPH WNW IN 1967
RECORDS FOR APRIL 11
HIGH 85 IN 2017
LOW 19 IN 1909
PRECIP 1.72 IN. IN 2003
SNOWFALL 9.5 IN. IN 1958
PEAK GUST 65 MPH NW IN 1963
TODAY’S REPORT PREPARED BY: Matt Douglas
