76 winters, day by day
Bolton Valley Resort, United States. Every ski winter from 1950/51 to 2025/26.
Bolton Valley Resort, United States. Every ski winter from 1950/51 to 2025/26.
Every day of every winter
Each row is a winter, oldest at the top. Each column is a day, from the start of the season to the end. The darker the blue, the more snow fell that day.
Loading the daily snowfall…
Climate change
Average winter temperature at the summit
Faster warming than 27% of 736 resorts
+1.8°C+3.2°F
The trend: from -8°C18°F to -6°C21°F. Point at a winter to read it.
Snowfall at the summit
−12%
The trend: from 2.2 m88 in to 2.0 m78 in. Point at a winter to read it.
Powder days at the summit
−1 day
The trend: from 4 to 3. Point at a winter to read it.
Days with a base at the summit
−49 days
The trend: from 98 to 49. Point at a winter to read it.
Days with fresh snow at the summit
−3 days
The trend: from 54 to 50. Point at a winter to read it.
Each dot is one winter. The curve is a running average over about ten winters; the dotted line is the straight trend through all of them, and the changes above are measured along it. One winter is weather; the trend is climate.
Then and now
Then 1950/51–1979/80Now 1996/97–2025/26
- Snowfall at the summit−8%
Then
2.2 m88 in
Now
2.1 m81 in
- Snowfall in the village−8%
Then
2.2 m88 in
Now
2.1 m81 in
- Powder days at the summit±0 days
Then
4
Now
3
- Days with a base at the summit−30 days
Then
93
Now
64
- Average temperature at the summit+1.3°C+2.3°F
Then
-8°C18°F
Now
-6°C21°F
Averages per winter over the first and last 30 winters. A powder day brings 10 cm4 in or more of new snow; a base is 30 cm12 in or more on the ground.
Records
All winters
- 1950s1950/512.2 m87 in1951/522.4 m93 in1952/532.3 m92 in1953/542.4 m94 in1954/552.4 m94 in1955/562.3 m92 in1956/571.7 m65 in1957/582.9 m115 in1958/592.4 m94 in1959/602.2 m87 in
- 1960s1960/611.8 m70 in1961/622.2 m87 in1962/632.4 m96 in1963/641.5 m59 in1964/651.6 m64 in1965/662.0 m77 in1966/671.6 m63 in1967/681.8 m72 in1968/692.8 m111 in1969/702.3 m91 in
- 1970s1970/712.9 m113 in1971/722.8 m108 in1972/732.4 m94 in1973/742.4 m94 in1974/752.5 m97 in1975/762.8 m110 in1976/772.4 m94 in1977/782.3 m91 in1978/792.2 m88 in1979/801.2 m47 in
- 1980s1980/811.6 m64 in1981/822.3 m89 in1982/831.5 m59 in1983/842.2 m85 in1984/852.2 m86 in1985/861.9 m74 in1986/871.9 m76 in1987/881.7 m67 in1988/891.9 m73 in1989/902.0 m77 in
- 1990s1990/911.6 m61 in1991/921.7 m67 in1992/932.1 m82 in1993/942.3 m91 in1994/951.5 m58 in1995/962.5 m97 in1996/972.6 m102 in1997/982.2 m86 in1998/991.9 m74 in1999/002.2 m88 in
- 2000s2000/012.5 m98 in2001/022.0 m78 in2002/032.2 m86 in2003/042.0 m80 in2004/051.6 m62 in2005/061.5 m58 in2006/072.6 m102 in2007/082.8 m109 in2008/091.9 m76 in2009/101.8 m70 in
- 2010s2010/112.5 m98 in2011/121.5 m58 in2012/131.6 m63 in2013/141.9 m76 in2014/152.2 m86 in2015/161.2 m48 in2016/172.4 m96 in2017/182.2 m85 in2018/192.6 m104 in2019/202.1 m83 in
- 2020s2020/211.8 m72 in2021/222.0 m78 in2022/232.0 m79 in2023/242.1 m83 in2024/252.2 m85 in2025/261.9 m76 in
Modelled weather from ERA5 and ERA5-Land, not measured on the slopes. Snow depth is the average over a grid cell about 9 km wide, so it can differ a lot from what the piste report says. How SnowOdds works