Thursday, July 30, 2026

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

THURSDAY, JULY 30, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0435E
SUNSET:  1906E

DECENT RAINFALL OVERNIGHT; DAMP, BUT LESS RAIN TODAY….

Rainfall late yesterday afternoon, and especially overnight,
while not overly heavy, did bring a solid dose of water to the
Hill. 1.36″ of rain was measured through 7am this morning. An
additional 0.04″ has fallen since then bringing the event
total so far to 1.40″. Rain tampered off to drizzle this morning
before coming to an end completely. It’s been dry since around
8:30am this morning, but more showers are developing and
rotating through the area early this afternoon. Clouds have been
the theme today as one would expect, although we did have a
brief period of sun around noon-time.

Temperatures are of course being held down again today by the
clouds. Readings have just reached 70F just after the 1pm obs,
but this is still more than 10 degrees below normal for the date.
The dew point also remains on the high side with values in the
60s, thus it’s still on the humid side despite it being cool.

Winds were gusty overnight into early this morning, but have
diminished some into early this afternoon. The average speed for
the day so far is around 11mph, mainly out of the north-northeast
to northeast. The peak gust so far for the day is 28mph, which
occurred around 9am this morning.

Visibility was quite limited during the morning as we were in
the clouds. The view was only around 1/8th of a mile for quite
some time through mid morning, before beginning to improve. By
the 1pm observation the overall visibility was around 30 miles,
however lower to the WNW through NW due to rain showers in the
area.

The maximum temperature so far today is 70F, which is 12 degrees
below the normal high of 82F. The minimum temperature since
midnight is 61F, which is 3 degrees below the normal low of 64F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft, light drizzle
Temperature: 61F; Dew Point: 61F; Relative Humidity: 100%
Wind: NNE @ 8G18 kts
Sea-level pressure: 1007.5 mb; 29.75 in. Hg: rising, then more rapidly
Visibility: 1/8 mile, fog
6-hr Max temp: 63F
6-hr Min temp: 61F
24-hr Precip: 1.36 inches
BHO SA 1155 X W2 1/8L-F 075/61/61/0308G18/975/ R-E23 L-B42/
8//// 53015 6027/ 70136 10063 20061

10 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: NNE @ 10G20 kts
Sea-level pressure: 1009.0 mb; 29.80 in. Hg: rising, then more rapidly
Visibility: 1 mile, fog
3-hr Precip: 0.04 inches
BHO SA 1455 X W2 1F 090/63/63/0310G20/980/ 8//// 53015 6004/

1 P.M.
Weather: Broken stratocumulus, overcast nimbostratus, few stratus
fractus distant W-NNE, virga distant WNW-NW
Temperature: 69F; Dew Point: 65F; Relative Humidity: 87%
Wind: NE @ 8G17 kts
Sea-level pressure: 1009.2 mb; 29.80 in. Hg: rising unsteadily
Visibility: 30 miles, 20 miles WNW, 10 miles NW, thin fog
6-hr Max temp: 69F
6-hr Min temp: 61F
6-hr Precip: 0.04 inches
BHO SA 1755 E45 BKN 85 OVC 30 092/69/65/0508G17/980/
FEW LWR STFRA DSNT W-NNE THN F ALQDS VIRGA DSNT WNW-NW
VSBY 20 WNW 10 NW/ 8/52/ 52002 6004/ 10069 20061

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SUMMARY FOR WEDNESDAY, JULY 29, 2026

TEMPERATURE (DEGREES F)
MAX…….69   NORMAL…..82
MIN…….63   NORMAL…..64
MEAN……66   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-7
TOTAL DEPARTURE FOR THE MONTH………………………+27 [+0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2026 THRU JUN 2027)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH (JUL)………..2  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE SEASON…………….2  DEPARTURE……..-5
TOTAL HEATING UNITS LAST SEASON TO DATE………..1  DEPARTURE……..+1

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..1  DEPARTURE……..-7
TOTAL COOLING UNITS FOR THE MONTH (JUL)………251  DEPARTURE…….+20
TOTAL COOLING UNITS FOR THE SEASON…………..490  DEPARTURE……+120
TOTAL COOLING UNITS LAST SEASON TO DATE………489  DEPARTURE……..+1

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated *=Last of multiple occurrences

F420C (Official)………..36 ESE  @   10:15 A.M.
VECTOR #1 (1-Sec)……….36 ESE  @   10:14 A.M.
VECTOR #2 (1-Sec)……….33 ESE  @   08:52 A.M.
DAVIS #1……………….33 ESE  @   10:14 A.M.
DAVIS #2 ………………32 ESE  @   10:15 A.M.
RMY #1 (Instantaneous)…..35 ESE  @   10:14 A.M.
RMY #2 (Instantaneous)…..34 ESE  @   08:52 A.M.
MERLIN…………………32 SE
RICHARDS (C5C) (Inst)……34 ESE  @   10:14 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………36 ESE  @   10:14 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..24 ESE  @   10:53 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 E    @   10:38 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 ESE  @   10:53 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 ESE  @   10:38 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 ESE  @   10:53 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 E    @   10:38 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………24 ESE  @   08:53 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.5 ESE [348 total miles] VECTOR #1………………14.0
VECTOR #2………………14.5
DAVIS #1……………….14.5 ESE
DAVIS #2……………….14.2 ESE
RMY #1…………………14.1 ESE
RMY #2…………………14.3 ESE
RICHARDS (C5C)………….14.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..1.36 DEPARTURE…..+1.24
TOTAL PRECIPITATION FOR THE MONTH (JUL)……..5.19 DEPARTURE…..+1.96
TOTAL PRECIPITATION FOR THE YEAR (2026)…….23.85 DEPARTURE…..-6.61

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PRELIMINARY CLIMATE SUMMARY FOR JULY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

7/1  95/68/82/+11/0.00/704/77            23 WSW VEC1 23 SW  RMY 24
7/2  99/72/86/+15/0.04/822/90            40 W   VEC1 39 W   RMY 45 TSTM
7/3  98/77/88/+16/0.00/803/88            32 WNW VEC1 32 WNW RMY 34 TSTM
7/4  94/73/84/+12/0.01/765/84            29 WNW VEC1 29 WNW RMY 29
7/5  83/69/76/+4/T/355/39                20 SSE VEC1 20 SE  RMY 17
7/6  74/60/67/-5/0.05/009/01             24 E   VEC1 24 E   RMY 24
7/7  65/61/63/-9/2.11/000/00             40 ENE VEC1 39 NE  RMY 40
7/8  83/58/72/-1/0.01/780/86             26 N   VEC1 26 N   RMY 25
7/9  91/65/78/+5/0.00/834/92             29 SW  VEC1 27 SW  RMY 29
7/10 88/69/79/+6/0.00/724/80             21 NE  VEC1 21 NE  RMY 23
7/11 82/66/74/+1/0.00/795/88             20 E   VEC1 20 E   RMY 19
7/12 81/61/71/-2/0.00/884/98             18 ENE VEC1 18 ENE RMY 18
7/13 86/62/74/+1/0.00/793/88             30 SW  VEC1 30 SSW RMY 32
7/14 88/67/78/+5/0.00/540/60             32 WSW VEC1 32 WSW RMY 34
7/15 82/67/75/+2/0.00/045/05             33 WNW VEC1 33 WNW RMY 33
7/16 86/63/75/+2/0.00/797/89             33 W   VEC1 34 NNW RMY 33
7/17 83/61/72/-1/0.00/823/92             28 NW  VEC1 27 NW  RMY 28
7/18 80/64/72/-1/0.23/268/30             41 SSW VEC1 40 SSW RMY 44 TSTM
7/19 79/63/71/-2/0.00/820/92             43 WNW VEC1 41 WNW RMY 43
7/20 83/58/71/-2/0.00/846/95             24 SSW VEC1 25 SSW RMY 24
7/21 76/60/68/-5/1.15/089/10             35 S   VEC1 35 SSW RMY 35 TSTM
7/22 83/64/74/+1/0.23/390/44             32 SSW VEC1 32 SSW RMY 33 TSTM
7/23 78/57/68/-5/0.00/841/95             23 NNW VEC1 23 NNW RMY 23
7/24 82/61/72/-1/0.00/804/91             26 SSE VEC1 27 SSE RMY 26
7/25 79/60/70/-3/0.00/863/98             23 E   VEC1 24 SE  RMY 22
7/26 73/56/65/-8/0.00/738/84             22 E   VEC1 21 NE  RMY 23
7/27 83/54/69/-4/0.00/675/77             18 S   VEC1 18 S   RMY 17
7/28 84/65/75/-2/0.00/420/48             31 S   VEC1 30 S   RMY 32
7/29 69/63/66/-7/0.00/000/00             36 ESE VEC1 36 ESE RMY 35

7/30 The low since midnight is 61F, the daily normal low is 64F.

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JULY DAILY RECORDS TO DATE

7/2 RECORD HIGH MAXIMUM TEMPERATURE OF 99F,
BEATING THE PREVIOUS RECORD OF 95F SET IN 1963

7/2 RECORD HIGH MINIMUM TEMPERATURE OF 72F,
THIS TIED THE RECORD WITH 1901, 1913, AND 1963

7/3 RECORD HIGH MINIMUM TEMPERATURE OF 77F,
BEATING THE PREVIOUS RECORD OF 76F SET IN 2002

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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944

RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895
PRECIP 1.34 INS IN 1892
PEAK GUST 43e MPH WNW SW IN 1953, 43 SW IN 1971

TODAY’S REPORT PREPARED BY: Matt Douglas/Lily Chen