Monday, July 13, 2026

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

MONDAY, JULY 13, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0419E
SUNSET:  1920E

BECOMING WARMER AND MORE HUMID WITH A MIX OF SUN AND CLOUDS…

Skies started the day on the clear side with only a few mid and
high level clouds around. A batch of mid level clouds, the
leftovers of some rain showers that moved across western Mass
this morning, have reached the local area early this afternoon
giving us a period of mostly cloudy skies. On the balance
however, today has featured a mix of sun and clouds.

The early morning temperature dipped into the lower 60s which
felt quite refreshing with the breeze. Readings quickly warmed
during the morning with abundant sunshine. We had reached the
low to mid 80s by the mid morning hours. As mentioned, the batch
of clouds moving through early this afternoon has, at least
temporarily, put a halt to the rise. The dew point on the other
hand has been gradually rising through the day, from the mid 50s
very early this morning to the mid 60s by early this afternoon.
As such, it has become noticeably more humid this afternoon.

Winds have been fairly steady out of the south-southwest to
southwest throughout the day. The average speed for the day so
far is around 11mph. The peak gust so far for the day is 26mph,
which occurred right around 12:40pm this afternoon.

Visibility has been limited today thanks to haziness. With the
increasing humidity, this trend is expected to continue. The
view has been holding around 35 miles through the day so far.

The maximum temperature so far today is 85F, which is 3 degrees
above the normal high of 82F. The minimum temperature since
midnight is 62F, which is 2 degrees below the normal low of 64F.

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus/castellanus all quadrants, few
cirrus all quadrants
Temperature: 70F; Dew Point: 62F; Relative Humidity: 75%
Wind: SW @ 7 kts
Sea-level pressure: 1024.0 mb; 30.24 in. Hg: rising, then steady
Visibility: 35 miles, hazy
6-hr Max temp: 70F
6-hr Min temp: 62F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 35 240/70/62/2207/024/ FEW AC/ACC ALQDS FEW CI ALQDS
HAZY/ 8/081 51007 10070 20062

10 A.M.
Weather: Thin broken cirrus, few altocumulus/castellanus distant
WSW-WNW
Temperature: 82F; Dew Point: 64F; Relative Humidity: 55%
Wind: SW @ 11G18 kts
Sea-level pressure: 1023.2 mb; 30.21 in. Hg: falling, then more slowly
Visibility: 35 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E250 -BKN 35 232/82/64/2211G18/021/ FEW AC/ACC DSNT
WSW-NNW HAZY/ 8/081 56008

1 P.M.
Weather: Scattered cumulus, broken altocumulus, broken cirrus,
few towering cumulus distant NW
Temperature: 84F; Dew Point: 67F; Relative Humidity: 56%
Wind: SW @ 10G19 kts
Sea-level pressure: 1021.6 mb; 30.17 in. Hg: falling, then more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 85F
6-hr Min temp: 70F
6-hr Precip: 0.00 inches
BHO SA 1755 45 SCT E95 BKN 250 BKN 35 216/84/67/2310G19/017/
FEW TCU DSNT NW HAZY/ 8/251 58016 10085 20070

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SUMMARY FOR SUNDAY, JULY 12, 2026

TEMPERATURE (DEGREES F)
MAX…….81   NORMAL…..82
MIN…….61   NORMAL…..64
MEAN……71   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-2
TOTAL DEPARTURE FOR THE MONTH………………………+53 [+4.2 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……..-1
TOTAL HEATING UNITS FOR THE SEASON…………….2  DEPARTURE……..-1
TOTAL HEATING UNITS LAST SEASON TO DATE………..1  DEPARTURE……..+1

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..6  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH (JUL)………141  DEPARTURE…….+52
TOTAL COOLING UNITS FOR THE SEASON…………..380  DEPARTURE……+152
TOTAL COOLING UNITS LAST SEASON TO DATE………314  DEPARTURE…….+66

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)………..18 ENE  @   11:23 A.M.
VECTOR #1 (1-Sec)……….18 ENE  @   08:51 A.M.
VECTOR #2 (1-Sec)……….19 ENE  @   09:39 A.M.
DAVIS #1……………….19 ENE  @   08:51 A.M.
DAVIS #2 ………………24 S    @   08:15 P.M.
RMY #1 (Instantaneous)…..18 ENE  @   08:51 A.M.
RMY #2 (Instantaneous)…..19 ENE  @   09:39 A.M.
MERLIN…………………16 NE
RICHARDS (C5C) (Inst)……17 ENE  @   09:29 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………13 SW   @   11:50 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..13 SSW  @   09:55 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..14 S    @   08:18 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 ENE  @   09:32 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 S    @   08:18 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..13 SSW  @   09:55 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..14 S    @   08:18 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………13 ENE  @   09:32 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.5 ENE [205 total miles] VECTOR #1……………….8.8
VECTOR #2……………….9.4
DAVIS #1………………..9.1 ESE
DAVIS #2………………..9.0 ESE
RMY #1………………….8.9 E
RMY #2………………….9.3 E
RICHARDS (C5C)…………..9.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH (JUL)……..2.22 DEPARTURE…..+0.89
TOTAL PRECIPITATION FOR THE YEAR (2026)…….20.88 DEPARTURE…..-7.68

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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 The low since midnight is 62F, 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 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996

RECORDS FOR JULY 14
HIGH 98F IN 1952
LOW 51F IN 1895, 1937
PRECIP 2.28 INS IN 1948
WIND 110e MPH NW IN 1942 [THUNDERSTORM GUST; RECORD FOR MONTH]

TODAY’S REPORT PREPARED BY: Matt Douglas