Mount Washington Observatory (MWOBS)
@MWObs
Followers
33K
Following
1K
Media
4K
Statuses
6K
Mount Washington Observatory is a non-profit institution working to advance understanding of the natural systems that create the Earth's weather and climate.
Mount Washington, NH
Joined October 2010
Last night (December 4th), an air temperature of -21F was measured at the summit of Mount Washington. This matched our daily record low for December 4th, originally set in 1976 and equaled in 1989 (records date back to 1932).
6
55
319
Sunset from the summit today. Thursday will see snow, increasing winds, and temperatures falling, with a run at the daily record low air temperature of 21°F below on Thursday and Friday. Additional details available at https://t.co/d1cUZjgzty
#NHwx #sunset #mountains #NH
5
28
206
Learn more about the project here: https://t.co/3kYsFaFJE8. To support research projects during our Year-End Campaign, visit https://t.co/1FI30KLkcp. Thank you!
0
1
3
Research Spotlight💫 Hear from MWOBS Weather Observer and Research/IT Specialist Karl Philippoff as he highlights The White Mountains Almanac, a publication produced in collaboration with the @AppMtnClub and @HubbardBrookNH exploring White Mountain ecology and climate.
1
1
10
Nearly 8 inches of new snow fell on Mount Washington with yesterday's Nor'easter. Now, with shifting winds, snow is blowing from the north side of the mountain to the south. With a brief break in the weather today, weather observers are bracing for an extreme cold event tomorrow.
3
29
211
If you are interested in supporting our work during this global day of giving, please consider making a donation at https://t.co/1FI30KLkcp. Thank you for your support!🌎
0
0
1
This month, we're sharing projects highlighting the impact of our supporters and partners during our 2025 Year-End Campaign. Below, Director of Weather Operations Jay Broccolo highlights research and tech initiatives as we look ahead to an exciting year: https://t.co/dqkfu4VLuf
1
0
7
Now through 12/5, all gifts will be matched up to $50,000. Thank you for your support!
0
0
4
Today is #GivingTuesday! We invite you to join us on this global day of giving: Your gift will go towards our Year-End Campaign, supporting scientific research and innovation on Mount Washington. Donate at https://t.co/s0d6JZuELT 🌎
4
4
21
Save the date! #GivingTuesday is on Dec. 2. We invite you to join us on this global day of giving: Your gift will go towards our Year-End Campaign, supporting scientific research and innovation on Mount Washington. Thank you! 🌎 Donate at https://t.co/1FI30KLS1X.
0
5
49
Our PistenBully was on the summit this evening for shift change - we usually swap out midweek, but due to Thanksgiving, we moved this week's swap out to Saturday. So, the downbound crew just completed an 11-day shift, as the upbound shift starts a 12-day shift in the days ahead.
1
6
112
*Please note: The Promo Code is valid for products on https://t.co/KP6dPs3vvq only and is not applicable to SmugMug, Calendars, Bonfire, Brad Washburn, or other partner collections. Offer ends 12/1/25 at 11:59PM EST.
shop.mountwashington.org
Purchase Mount Washington Observatory apparel and gifts at our online store.
0
2
3
Shop online with us now through Monday, 12/1 for 20% off at https://t.co/wIW57YVBiJ! Use Promo Code MWOBS20 at checkout and take advantage of our only sale of the year.🎁
1
4
24
Well below-average temperatures and snow showers are in store for the Higher Summits to start this holiday weekend. For more details, please visit
mountwashington.org
Higher Summits Forecast Mountain weather is subject to rapid changes and extreme conditions. This forecast is just one tool to help you plan a safe trip (if in doubt, turn around!). Always travel...
0
0
9
Happy Thanksgiving from MWOBS! The summit team paired up with NH State Parks staff tonight to prepare a great holiday dinner.
5
10
185
Overcast skies look to continue today before snow and sleet move in later this afternoon. This will be followed by a wintry mix overnight, followed by an eventual transition to rain at all elevations by Wednesday morning. For more details, please visit https://t.co/xbagsk8SsF.
mountwashington.org
Higher Summits Forecast Mountain weather is subject to rapid changes and extreme conditions. This forecast is just one tool to help you plan a safe trip (if in doubt, turn around!). Always travel...
0
0
9
Right around sunrise this morning, a few rays of sunlight managed to sneak through and light up the bases of the clouds to our east. Westerly flow over the summit created a very distinct lenticular cloud located to the center-left of the picture, bordered by a red ring. (1/2)
7
59
349
Please note: The shipping deadline for holiday orders on our website is Dec. 11. Be sure to check out our gift guide for ideas: https://t.co/Gk8xuauyfC
0
0
3
When you shop with the Observatory this holiday season, you're not only gifting official MWOBS products, you're also supporting our mission. Shop apparel, prints, toys, books, calendars, and more here: https://t.co/KQfn4MNOMk💫
2
2
33
For details on the forecast for the higher summits to end this weekend, visit https://t.co/nTW5QhIlIs
#sunrise #rimeice #mountwashington #whitemountains #winter #snow
mountwashington.org
Higher Summits Forecast Mountain weather is subject to rapid changes and extreme conditions. This forecast is just one tool to help you plan a safe trip (if in doubt, turn around!). Always travel...
2
0
7