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Thursday, October 16, 2025

October 16, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, OCTOBER 16, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, OCTOBER 16, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0559E SUNSET:  1700E PLENTY OF SUNSHINE FADES TO INCREASING CLOUDS WITH A BRISK WIND AND A FALL CHILL…. Skies started off the day mainly clear, but clouds have increased from the northeast into early this afternoon as our coastal storm from earlier in the week tries to back into the region. Temperatures are below normal with readings only reaching the low to mid 50s early this afternoon. With a brisk wind, there is a wind chill today which has been hovering in the mid to upper 40s. Dew point values are lower today indicating a dry polar air mass in place. Readings have been holding in the mid 30s throughout the day. The wind has been busy today out of the northwest to north- northwest. The average speed for the day so far is around 13mph. Gusts have been frequently exceeding 25mph since about mid morning. The peak gust so far for the day is 35mph, which occurred just after 11am this morning. Visibility has been excellent today with a view of around 80 miles! The maximum temperature so far today is 53F degrees, which is 8 degrees below the normal high of 61F. The minimum temperature since midnight is 39F degrees, which is 5 degrees below the normal low of 44F. ————————————————————– Today’s Observations: 7 A.M. Weather: Clear, few stratocumulus distant NW-NNW and distant NE-S, few altocumulus distant S-W-N-ENE, few cirrus distant NW-NE Temperature: 42F; Dew Point: 34F; Relative Humidity: 72% Wind: NW @ 9G18 kts Sea-level pressure: 1011.6 mb; 29.87 in. Hg: falling, then rising Visibility: 80 miles 6-hr Max temp: 44F 6-hr Min temp: 39F 24-hr Precip: 0.00 inches BHO SA 1155 CLR 80 116/42/34/3209G18/987/ FEW SC DSNT NW-NNW AND DSNT NE-S FEW AC DSNT S-W-N-ENE FEW CI DSNT NW-NE/ 8/581 55002 10044 20039 10 A.M. Weather: Clear, few stratocumulus all quadrants, few altocumulus distant N-ESE, few cirrus distant NNW-ENE Temperature: 49F; Dew Point: 34F; Relative Humidity: 55% Wind: NNW @ 13G23 kts, peak wind NW 30mph at 9:28 A.M. Sea-level pressure: 1011.1 mb; 29.86 in. Hg: falling, then more rapidly Visibility: 80 miles 3-hr Precip: 0.00 inches BHO SA 1455 CLR 80 111/49/34/3313G23/986/ FEW SC ALQDS FEW AC DSNT N-ESE FEW CI DSNT NNW-ENE PK WND 3226/28/ 8/551 58005 1 P.M. Weather: Broken stratocumulus lenticularis, broken altocumulus lenticularis Temperature: 53F Dew Point: 35F; Relative Humidity: 50% Wind: NNW @ 14G27 kts, peak wind NW 31mph at 12:45 P.M. Sea-level pressure: 1010.1 mb; 29.83 in. Hg: falling, then more slowly Visibility: 80 miles 6-hr Max temp: 53F 6-hr Min temp: 42F 6-hr Precip: 0.00 inches BHO SA 1755 E45 BKN 85 BKN 80 101/53/35/3314G27/983/ PK WND 3227/45/ 8/550 56010 10053 20042 ————————————————————– SUMMARY FOR WEDNESDAY, OCTOBER 15, 2025 TEMPERATURE (DEGREES F) MAX…….62   NORMAL…..61 MIN…….44   NORMAL…..44 MEAN……53   NORMAL…..53 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………..0 TOTAL DEPARTURE FOR THE MONTH………………………+40 [+2.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY…………….12  DEPARTURE………0 TOTAL HEATING UNITS FOR THE MONTH……………123  DEPARTURE…….-26 TOTAL HEATING UNITS FOR THE SEASON…………..186  DEPARTURE…….-80 TOTAL HEATING UNITS LAST SEASON TO DATE………213  DEPARTURE…….-27 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…….+14 TOTAL COOLING UNITS FOR THE SEASON…………..756  DEPARTURE…….+80 TOTAL COOLING UNITS LAST SEASON TO DATE………757  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)………..33 NNW  @   03:56 P.M. VECTOR #1 (1-Sec)……….33 NNW  @   04:09 P.M. VECTOR #2 (1-Sec)……….32 NNW  @   04:07 P.M. DAVIS #1……………….31 NW   @   03:56 P.M. DAVIS #2 ………………29 N    @   04:07 P.M. RMY #1 (Instantaneous)…..35 NNW  @   03:29 P.M. RMY #2 (Instantaneous)…..32 NNW  @   07:33 P.M. MERLIN…………………29 N RICHARDS (C5C) (Inst)……33 NNW  @   03:29 P.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………23 NNW  @   03:58 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 NNW  @   04:10 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 NNW  @   04:11 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 NNW  @   04:10 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 N    @   04:11 P.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 NNW  @   04:10 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 NNW  @   04:11 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21 NNW  @   04:10 P.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………9.7 NNW [233 total miles] VECTOR #1………………10.2 VECTOR #2………………10.3 DAVIS #1……………….10.1 NNW DAVIS #2………………..9.4 N RMY #1………………….9.9 NNW RMY #2…………………10.1 NNW RICHARDS (C5C)………….10.4 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18 TOTAL PRECIPITATION FOR THE MONTH…………..4.34 DEPARTURE…..+1.79 TOTAL PRECIPITATION FOR THE YEAR (2025)…….40.16 DEPARTURE…..-1.06 ————————————————————– 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 10/15 The low since midnight is 39F, the daily normal low is 44F. ————————————————————– 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 16 HIGH 86F IN 1897 LOW 28F IN 1886 PRECIP 2.82 INCHES IN 1974 SNOWFALL TRACE IN 2009 PEAK GUST 68e MPH SSE IN 1954 (HURRICANE HAZEL) RECORDS FOR OCTOBER 17 HIGH 86F IN 1947 LOW 25F IN 1886 PRECIP 1.87 INCHES IN 1989 SNOWFALL TRACE IN 1970 PEAK GUST 61 MPH E IN 2019 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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