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Monday, October 27, 2025

October 27, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA MONDAY OCTOBER 27, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA MONDAY OCTOBER 27, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0612E SUNSET:  1644E SUNNY START, THEN CLOUDS ROLLED IN, STILL ON THE CHILLY SIDE…. We started the day with clear skies and a touch of frost for the first time this season here on the summit. However, clouds quickly began moving in from the north and northeast as yet another ocean storm well to our northeast is stuck and trying to back in toward the region today. With the cloud cover, temperatures were not rising too quickly by late this morning and have recovered to the low 50s after starting the day in the low to mid 30s. Dew points values started off in the low 30s, but have since risen to the mid to upper 30s as the wind became more onshore. A northwest to north-northwest wind early in the day has gradually veered around to the north-northeast and northeast. Speeds have not been on the lighter side with an average speed for the day so far around 9mph. We have seen some occasional gustiness to the wind, but each period has been brief. The peak gust for the day so far is 20mph, which occurred just after 9:30am this morning. Visibility has been very good today, holding generally around 70 miles throughout the day. The maximum temperature so far today is 51F degrees, which is 6 degrees below the normal high of 57F. The minimum temperature since midnight is 34F degrees, which is 6 degrees below the normal low of 40F. ————————————————————– Today’s Observations: 7 A.M. Weather: Clear, few stratocumulus offshore distant NE-SE-S, few altocumulus/castellanus distant NNW-NE, few cirrus distant N-E-SSW Temperature: 36F; Dew Point: 32F; Relative Humidity: 84% Wind: NNW @ 8 kts Sea-level pressure: 1029.5 mb; 30.40 in. Hg: rising, then more rapidly Visibility: 70 miles 6-hr Max temp: 36F 6-hr Min temp: 34F 24-hr Precip: 0.00 inches BHO SA 1155 CLR 70 295/36/32/3408/040/ FEW SC OFFSHR DSNT NE-SE-S FEW AC/ACC DSNT NNW-NE FEW CI DSNT N-E-SSW/ 8/581 53008 10036 20034 10 A.M. Weather: Broken stratocumulus, few lower stratocumulus distant N-ESE Temperature: 48F; Dew Point: 36F; Relative Humidity: 63% Wind: N @ 5 kts, wind light Sea-level pressure: 1029.1 mb; 30.39 in. Hg: steady, then falling Visibility: 70 miles 3-hr Precip: 0.00 inches BHO SA 1455 E35 BKN 70 291/48/36/0105/039/ FEW LWR SC DSNT N-ESE WND LGT/ 8/500 58004 1 P.M. Weather: Overcast stratocumulus, few breaks in overcast all quadrants Temperature: 49F Dew Point: 38F; Relative Humidity: 64% Wind: NE @ 4 kts, wind light Sea-level pressure: 1027.8 mb; 30.35 in. Hg: falling, then more slowly Visibility: 70 miles 6-hr Max temp: 51F 6-hr Min temp: 36F 6-hr Precip: 0.00 inches BHO SA 1755 E40 OVC 70 278/49/38/0504/035/ FEW BINOVC ALQDS WND LGT/ 8/5// 56013 10051 20036 ————————————————————– SUMMARY FOR SUNDAY, OCTOBER 26, 2025 TEMPERATURE (DEGREES F) MAX…….56   NORMAL…..57 MIN…….37   NORMAL…..40 MEAN……47   NORMAL…..49 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-2 TOTAL DEPARTURE FOR THE MONTH………………………+61 [+2.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY…………….18  DEPARTURE……..+2 TOTAL HEATING UNITS FOR THE MONTH……………260  DEPARTURE…….-48 TOTAL HEATING UNITS FOR THE SEASON…………..323  DEPARTURE……-103 TOTAL HEATING UNITS LAST SEASON TO DATE………306  DEPARTURE…….+17 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE………0 TOTAL COOLING UNITS FOR THE MONTH…………….20  DEPARTURE…….+13 TOTAL COOLING UNITS FOR THE SEASON…………..756  DEPARTURE…….+79 TOTAL COOLING UNITS LAST SEASON TO DATE………761  DEPARTURE……..-5 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)………..23 WNW  @   12:05 P.M. VECTOR #1 (1-Sec)……….23 WNW  @   12:05 P.M. VECTOR #2 (1-Sec)……….26 NW   @   12:23 P.M. DAVIS #1……………….23 WNW  @   12:05 P.M. DAVIS #2 ………………20 N    @   04:29 P.M. RMY #1 (Instantaneous)…..24 NW   @   12:24 P.M. RMY #2 (Instantaneous)…..26 NW   @   12:23 P.M. MERLIN…………………25 NW RICHARDS (C5C) (Inst)……23 WNW  @   12:05 P.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………17 NW   @   12:27 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18 NW   @   12:25 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 NW   @   12:25 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 NW   @   12:25 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 NNW  @   11:53 A.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 NW   @   12:25 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 NW   @   12:25 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 NW   @   12:25 P.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………8.5 NNW [203 total miles] VECTOR #1……………….9.8 VECTOR #2………………10.1 DAVIS #1………………..9.8 NNW DAVIS #2………………….M RMY #1………………….9.6 NNW RMY #2………………….9.9 NNW RICHARDS (C5C)………….10.1 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18 TOTAL PRECIPITATION FOR THE MONTH…………..5.53 DEPARTURE…..+0.94 TOTAL PRECIPITATION FOR THE YEAR (2025)…….41.35 DEPARTURE…..-1.91 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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 10/1  61/49/55/-3/0.00/668/97            30 NE  VEC1 30 NE  RMY 30 10/2  60/43/52/-6/0.00/637/91            28 NE  VEC1 28 NE  RMY 28 10/3  72/46/59/+2/0.00/670/96            23 SW  VEC1 23 SW  RMY 23 10/4  81/53/67/+10/0.00/667/96           18 NNW VEC1 18 NW  RMY 19 10/5  84/62/73/+16/0.00/664/96           18 SSW VEC1 18 SSW RMY 18 10/6  83/59/71/+15/0.00/649/94           25 SSW VEC1 25 SSW RMY 26 10/7  79/59/69/+13/0.00/440/64           35 SSW VEC1 35 SSW RMY 36 10/8  68/49/59/+4/0.80/027/04            33 NW  VEC1 34 SSW RMY 35 TSTM 10/9  55/40/48/-7/0.00/667/98            33 NNW VEC1 35 NNW RMY 35 10/10 61/38/50/-5/0.00/664/98            25 SSW VEC1 26 S   RMY 26 10/11 66/49/58/+4/0.00/243/36            21 SW  VEC1 21 SW  RMY 20 10/12 56/52/54/0/0.91/000/00             50 ENE VEC1 50 ENE RMY 52 10/13 53/50/52/-2/2.14/000/00            51 ENE VEC1 51 ENE RMY 51 10/14 53/50/52/-1/0.49/000/00            36 NE  VEC1 36 NNE RMY 35 10/15 62/44/53/0/T/319/48                33 NNW VEC1 33 NNW RMY 35 10/16 53/39/46/-6/0.00/410/62            35 NW  VEC1 35 NW  RMY 36 10/17 61/41/51/-1/0.00/652/99            26 N   VEC1 26 N   RMY 27 10/18 63/40/52/0/0.00/604/92             17 SSE VEC1 16 NNW RMY 17 10/19 68/50/59/+8/0.00/568/87            28 SSE VEC1 29 SSE RMY 28 10/20 64/51/58/+7/0.75/072/11            40 SSE VEC1 40 SSE RMY 41 10/21 65/47/56/+5/0.00/648/100           28 WSW VEC1 28 WSW RMY 29 10/22 67/51/59/+9/0.44/387/60            32 SW  VEC1 33 SW  RMY 33 10/23 61/45/53/+3/0.00/…/..            29 WSW VEC1 29 WSW RMY 29 10/24 58/41/50/0/0.00/…/..             20 WNW VEC1 20 WNW RMY 19 10/25 55/38/47/-2/0.00/…/..            23 NW  VEC1 23 NNW RMY 23 10/26 56/37/47/-2/0.00/…/..            23 WNW VEC1 23 WNW RMY 24 10/27 The low since midnight is 34F, the daily normal low is 40F. ————————————————————– OCTOBER DAILY RECORDS TO DATE 10/5  HIGH MINIMUM TEMPERATURE OF 62F, TIED THE RECORD FOR THE DATE WITH 1910 10/6  HIGH MAXIMUM TEMPERATURE OF 83F, TIED THE RECORD FOR THE DATE WITH 1990 AND 2007 10/13 PEAK GUST OF 51 MPH ENE, BEAT THE OLD RECORD OF 46e MPH W IN 1950 ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR OCTOBER 27 HIGH 83F IN 1963 LOW 21F IN 1936 PRECIP 2.08 INCHES IN 2018 SNOW 2.5 INCHES IN 2011 WIND 66 MPH NNE IN 2021 RECORDS FOR OCTOBER 28 HIGH 81F IN 1919 LOW 23F IN 1914 PRECIP 2.46 INCHES IN 2006 SNOWFALL TRACE IN 1891,1934,1957,1979 PEAK GUST 71 MPH SSW IN 1995 TODAY’S REPORT PREPARED BY: Matt Douglas
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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

Ownership and Proprietary Rights

All observational records, compiled datasets, metadata, database structures, and related materials provided by the Blue Hill Observatory & Science Center are the exclusive property of the Blue Hill Observatory & Science Center. The Observatory has maintained continuous weather observations at the summit of Great Blue Hill since 1885, and the entirety of that record — its compilation, structure, curation, and organization — constitutes a proprietary database protected under applicable United States law, including copyright law and common law database protections.

All rights not expressly granted in this Policy are reserved by the Observatory. No access to or use of Observatory data shall be construed as a waiver of any rights or as a license to use data beyond the scope expressly stated herein.

§ 02

Governing Law and Jurisdiction

This Policy shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts, without regard to its conflict of law provisions. For interactions with international users, this Policy shall apply to the maximum extent permitted by applicable local law.

Any dispute arising from or related to this Policy shall be subject to the exclusive jurisdiction of the state and federal courts located in Norfolk County, Massachusetts. By accessing Observatory data, all users consent to personal jurisdiction in Massachusetts and waive any objection to the venue or inconvenience of such forum.

§ 03

Permitted Uses

Observatory data are made available for the following limited, non-commercial purposes only:

  • Personal study and analysis
  • Educational classroom use
  • Student projects
  • Non-commercial academic research
  • Publication of analyses, figures, models, or conclusions derived from the data, subject to the attribution requirements of Section 4

All other uses require prior written authorization from the Observatory.

§ 04

Attribution Requirement

Any use of Observatory data in any published, presented, or publicly distributed work must include the following verbatim acknowledgment:

“Data provided by the Blue Hill Observatory & Science Center, Milton, Massachusetts. Continuous weather observations since 1885.”

Failure to include proper attribution is a material violation of this Policy.

§ 05

Prohibited Uses

Unless explicitly authorized in writing, Users may not:

  • Resell, license, sublicense, or commercially exploit Observatory data in any form
  • Redistribute the dataset in whole or in part to any third party
  • Publish the dataset for download by third parties
  • Host, mirror, or archive the dataset on any external website, repository, or storage service
  • Upload the dataset to any public or institutional data repository
  • Provide the data through APIs, automated services, or subscription platforms
  • Incorporate the data into any commercial product, software, application, or service
  • Use the data for AI or machine learning systems intended for commercial use or external distribution
  • Use the data to create derivative datasets that enable reconstruction of the underlying observations
§ 06

Commercial Licensing

Organizations seeking to use Observatory data for commercial purposes must obtain a license prior to any such use. Licensing inquiries: data@bluehill.org.

§ 07

Automated Access

Automated scraping, bulk harvesting, or systematic downloading of Observatory data is strictly prohibited without prior written authorization.

§ 08

Enforcement and Remedies

Violation of this Policy may result in immediate revocation of data access, pursuit of legal remedies available under United States law, and referral to applicable authorities. The Observatory reserves all rights to seek injunctive relief, damages, and attorneys’ fees in connection with any unauthorized use of its data.

Part II — Privacy Policy
§ 09–10

Scope & Information Collected

This section governs the collection, use, storage, and disclosure of personal information from visitors to the Blue Hill Observatory website and users of its data services. The Observatory may collect contact information (name, email, organization) when voluntarily submitted, usage data including IP addresses and pages visited, and data download records.

§ 11–12

How We Use Information & Retention

Information is used solely for: responding to inquiries and licensing requests; monitoring and enforcing compliance with this Policy; improving website performance; and communicating Observatory news to opted-in users. The Observatory does not sell, rent, or share personal information with third parties for marketing purposes. Data access records may be retained indefinitely for compliance and enforcement purposes.

§ 13

International Users and Data Transfers

The Observatory is located in the United States. International users acknowledge their information will be processed in the United States under U.S. law. Users requiring specific data processing agreements under non-US law must contact data@bluehill.org before accessing data.

§ 14–16

Cookies, Security & Children’s Privacy

The Observatory website may use cookies for analytics and functionality. By continuing to use the site, users consent to cookie use. The Observatory implements reasonable measures to protect personal information but cannot guarantee absolute security. Observatory data services are not directed at children under 13.

Part III — General Provisions
§ 17–20

Modifications, Severability, Entire Agreement & Contact

The Observatory reserves the right to modify this Policy at any time. Updated versions will be posted at bluehill.org. Continued use of Observatory data following any modification constitutes acceptance of the revised Policy. This Policy constitutes the entire agreement between the User and the Observatory. Questions and licensing inquiries: Blue Hill Observatory & Science Center, Milton, Massachusetts — data@bluehill.org

By accessing, downloading, or using any Blue Hill Observatory data or services, you acknowledge that you have read, understood, and agree to be bound by this Policy.
Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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