Updated October 2026
Saint Croix National Scenic Riverway Weather by Month
Saint Croix National Scenic Riverway is warmest in July, when the nearest NOAA climate station averages a high of 81°F and a low of 60°F, and coldest in January, with an average high of 22°F and an average low of 5°F. July and August are the wettest months, with about 4.3 inches of precipitation each. Snowfall is heaviest in December, at about 15 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, 10.6 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Saint Croix National Scenic Riverway can differ from these, particularly with elevation.
Warmest month
Jul
81°F avg high
Coldest month
Jan
5°F avg low
Snowiest month
Dec
15.3 in avg
Longest days
Jun
15.5 h of daylight
Average weather at Saint Croix by month
| Month | Avg high | Avg low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 22°F | 5°F | 0.8 in | 9.8 in | 8.9 h |
| February | 28°F | 8°F | 0.8 in | 12.6 in | 10.1 h |
| March | 40°F | 21°F | 1.5 in | 9.0 in | 11.6 h |
| April | 55°F | 34°F | 2.7 in | 4.6 in | 13.3 h |
| May | 68°F | 46°F | 4.2 in | 0.2 in | 14.7 h |
| June | 77°F | 56°F | 4.2 in | 0.0 in | 15.5 h |
| July | 81°F | 60°F | 4.3 in | 0.0 in | 15.2 h |
| August | 79°F | 58°F | 4.3 in | 0.0 in | 13.9 h |
| September | 71°F | 50°F | 3.6 in | 0.0 in | 12.3 h |
| October | 57°F | 38°F | 3.4 in | 1.3 in | 10.7 h |
| November | 40°F | 25°F | 1.9 in | 8.4 in | 9.2 h |
| December | 27°F | 12°F | 1.2 in | 15.3 in | 8.5 h |
| Year total | 32.9 in | 61.2 in |
NOAA 1991–2020 climate normals from station USC00474894, 10.6 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Saint Croix is at that time of year.
Saint Croix weather by season
Winter: December to February
Average highs bottom out at 22°F in January, between 27°F in December and 28°F in February, with average lows between 5°F and 12°F. The average high stays at or below freezing in all three months. Together the three months average 2.8 inches of precipitation, about 9% of the yearly total and less than in any other season. Snowfall averages about 38 inches for the season. Daylight is at its shortest, about 8.5 hours in December.
Spring: March to May
Average highs climb from 40°F in March to 68°F in May, with average lows between 21°F and 46°F. The average low is at or below freezing in March. Together the three months average 8.4 inches of precipitation, about 26% of the yearly total. Snowfall averages about 14 inches for the season, most of it in March. Daylight lengthens from about 11.6 hours in March to 14.7 in May.
Summer: June to August
Average highs peak at 81°F in July, between 77°F in June and 79°F in August, with average lows between 56°F and 60°F. Together the three months average 12.8 inches of precipitation, about 39% of the yearly total and more than in any other season. Daylight is at its longest, about 15.5 hours in June.
Fall: September to November
Average highs fall from 71°F in September to 40°F in November, with average lows between 25°F and 50°F. The average low is at or below freezing in November. Together the three months average 8.9 inches of precipitation, about 27% of the yearly total. Snowfall averages about 9.7 inches for the season, most of it in November. Daylight shortens from about 12.3 hours in September to 9.2 in November.
What the National Park Service says about the weather
Access to the Riverway is year-round. Early spring temperatures can reach into the 40's resulting in high, fast, and cold water from melting snow and ice. Summers are warm and humid. Severe weather can be experienced anytime from mid-spring through late summer. Fall colors begin in late September with high temperatures averaging in the 60's. Winter can set in early with high temperatures in the teens, lows falling below zero, and occasional heavy snow. The rivers can begin to freeze over by early December.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Saint Croix
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 45.70°N, 92.36°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 Saint Croix National Scenic Riverway →
Weather and crowds together
July is both the warmest month and the busiest, with about 3.1× the visitors of the park's average month. December is the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Saint Croix National Scenic Riverway. For hotels, cabins and rentals close to the park, see where to stay near Saint Croix.
Where to stay near Saint Croix
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Frequently Asked Questions
July is the warmest month at Saint Croix National Scenic Riverway, with an average high of 81°F and an average low of 60°F. That is the 1991–2020 average at the nearest long-record NOAA station, 10.6 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Saint Croix National Scenic Riverway, with an average low of 5°F and an average high of 22°F, based on NOAA 1991–2020 climate normals.
July and August are the wettest months, with about 4.3 inches of precipitation each. January and February are the driest, at about 0.8 inches each. The station records about 32.9 inches of precipitation in an average year.
Yes. The nearest long-record NOAA station, 10.6 miles from the park's reference point, averages about 61 inches of snow a year. December is the snowiest month, at about 15 inches. The station averages at least a tenth of an inch of snow in 8 of the 12 months.
Weather at nearby parks
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Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00474894), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1979–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.