Updated October 2026
Thaddeus Kosciuszko National Memorial Weather by Month
Thaddeus Kosciuszko National Memorial is warmest in July, when the nearest NOAA climate station averages a high of 89°F and a low of 71°F, and coldest in January, with an average high of 42°F and an average low of 28°F. August is the wettest month, with about 5 inches of precipitation. Snowfall is heaviest in January, at about 6.4 inches.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 1.7 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Thaddeus Kosciuszko National Memorial can differ from these, particularly with elevation.
Warmest month
Jul
89°F avg high
Coldest month
Jan
28°F avg low
Wettest month
Aug
5.0 in avg
Snowiest month
Jan
6.4 in avg
Longest days
Jun
14.8 h of daylight
Average weather at Thaddeus Kosciuszko by month
| Month | Avg high | Avg low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 42°F | 28°F | 3.6 in | 6.4 in | 9.5 h |
| February | 45°F | 30°F | 3.3 in | 4.0 in | 10.5 h |
| March | 54°F | 36°F | 4.5 in | 2.0 in | 11.7 h |
| April | 66°F | 46°F | 4.0 in | 0.1 in | 13.1 h |
| May | 76°F | 56°F | 4.1 in | 0.0 in | 14.2 h |
| June | 85°F | 66°F | 4.8 in | 0.0 in | 14.8 h |
| July | 89°F | 71°F | 4.8 in | 0.0 in | 14.6 h |
| August | 87°F | 70°F | 5.0 in | 0.0 in | 13.6 h |
| September | 80°F | 63°F | 4.9 in | 0.0 in | 12.2 h |
| October | 68°F | 51°F | 4.2 in | 0.0 in | 10.9 h |
| November | 56°F | 41°F | 3.4 in | 0.1 in | 9.7 h |
| December | 47°F | 33°F | 4.3 in | 3.5 in | 9.2 h |
| Year total | 50.9 in | 16.1 in |
NOAA 1991–2020 climate normals from station USC00366886, 1.7 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Thaddeus Kosciuszko is at that time of year.
Thaddeus Kosciuszko weather by season
Winter: December to February
Average highs bottom out at 42°F in January, between 47°F in December and 45°F in February, with average lows between 28°F and 33°F. The average low is at or below freezing in January and February. Together the three months average 11.2 inches of precipitation, about 22% of the yearly total and less than in any other season. Snowfall averages about 14 inches for the season. Daylight is at its shortest, about 9.2 hours in December.
Spring: March to May
Average highs climb from 54°F in March to 76°F in May, with average lows between 36°F and 56°F. Together the three months average 12.6 inches of precipitation, about 25% of the yearly total. Snowfall averages about 2.1 inches for the season, most of it in March. Daylight lengthens from about 11.7 hours in March to 14.2 in May.
Summer: June to August
Average highs peak at 89°F in July, between 85°F in June and 87°F in August, with average lows between 66°F and 71°F. Together the three months average 14.6 inches of precipitation, about 29% of the yearly total and more than in any other season. Daylight is at its longest, about 14.8 hours in June.
Fall: September to November
Average highs fall from 80°F in September to 56°F in November, with average lows between 41°F and 63°F. Together the three months average 12.5 inches of precipitation, about 25% of the yearly total. Snowfall averages about 0.1 inches for the season. Daylight shortens from about 12.2 hours in September to 9.7 in November.
What the National Park Service says about the weather
Summers are typically hot and muggy, fall and spring are generally mild, and winter is cold. Snowfall is highly variable, with some winters bringing only light snow and others bringing several major snowstorms, with the normal seasonal snowfall standing at 22.4 in (57 cm). Precipitation is generally spread throughout the year, with eight to twelve wet days per month.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Thaddeus Kosciuszko
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 39.94°N, 75.15°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for Thaddeus Kosciuszko National Memorial →
Weather and crowds together
July is both the warmest month and the busiest, with about 1.8× the visitors of the park's average month. January is the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Thaddeus Kosciuszko National Memorial. For hotels, cabins and rentals close to the park, see where to stay near Thaddeus Kosciuszko.
Where to stay near Thaddeus Kosciuszko
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Frequently Asked Questions
July is the warmest month at Thaddeus Kosciuszko National Memorial, with an average high of 89°F and an average low of 71°F. That is the 1991–2020 average at the nearest long-record NOAA station, 1.7 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Thaddeus Kosciuszko National Memorial, with an average low of 28°F and an average high of 42°F, based on NOAA 1991–2020 climate normals.
August is the wettest month, with about 5 inches of precipitation. February is the driest, at about 3.3 inches. The station records about 50.9 inches of precipitation in an average year.
Yes. The nearest long-record NOAA station, 1.7 miles from the park's reference point, averages about 16 inches of snow a year. January is the snowiest month, at about 6.4 inches. The station averages at least a tenth of an inch of snow in 6 of the 12 months.
Weather at nearby parks
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Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00366886), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1981–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.