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Siena vs Crested Butte
Comparing Siena change · Crested Butte change
Siena is the warmer of the two — about 22°F on the annual average; Siena is the wetter, with 10 in more rain a year.
How the seasons compare
The differences between Siena and Crested Butte, in everyday terms.
Summers
Siena has much hotter summers
Siena: Hot
Crested Butte: Mild
Winters
Siena has far milder winters
Siena: Chilly
Crested Butte: Bitterly cold
Rain & snow
Siena is wetter
Siena: Moderate rainfall
Crested Butte: Moderate rainfall
Sky
Similar amounts of sun
Siena: Partly cloudy
Crested Butte: Partly cloudy
Month-by-month charts
Temperature
Siena is the warmer of the two — about 22°F on the annual average.
Precipitation
Siena is the wetter — about 10 in more across the year.
Clear skies
The two cities see a similar amount of sun.
Exact monthly numbers
Tap a metric to open its full table. Desktop shows all twelve months; on a phone each metric splits into Jan–Jun and Jul–Dec.
Avg high (°F) Siena runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siena | 49 | 52 | 59 | 66 | 74 | 82 | 89 | 89 | 78 | 68 | 57 | 50 |
| Crested Butte | 26 | 30 | 38 | 47 | 58 | 71 | 76 | 74 | 66 | 55 | 40 | 27 |
| Difference | -23 | -22 | -20 | -19 | -16 | -12 | -12 | -15 | -12 | -13 | -17 | -23 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | 49 | 52 | 59 | 66 | 74 | 82 |
| Crested Butte | 26 | 30 | 38 | 47 | 58 | 71 |
| Difference | -23 | -22 | -20 | -19 | -16 | -12 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | 89 | 89 | 78 | 68 | 57 | 50 |
| Crested Butte | 76 | 74 | 66 | 55 | 40 | 27 |
| Difference | -12 | -15 | -12 | -13 | -17 | -23 |
Avg low (°F) Siena runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siena | 33 | 33 | 37 | 42 | 49 | 56 | 60 | 60 | 53 | 47 | 41 | 34 |
| Crested Butte | -6 | -2 | 7 | 19 | 28 | 34 | 39 | 39 | 31 | 22 | 9 | -4 |
| Difference | -39 | -35 | -30 | -23 | -21 | -22 | -20 | -21 | -22 | -25 | -31 | -38 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | 33 | 33 | 37 | 42 | 49 | 56 |
| Crested Butte | -6 | -2 | 7 | 19 | 28 | 34 |
| Difference | -39 | -35 | -30 | -23 | -21 | -22 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | 60 | 60 | 53 | 47 | 41 | 34 |
| Crested Butte | 39 | 39 | 31 | 22 | 9 | -4 |
| Difference | -20 | -21 | -22 | -25 | -31 | -38 |
Precipitation (in) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siena | 2.1 | 2.2 | 2.5 | 2.8 | 2.9 | 2.1 | 1.7 | 1.7 | 3.8 | 4.3 | 4.8 | 3.2 |
| Crested Butte | 2.7 | 2.5 | 2.1 | 2 | 1.5 | 0.9 | 2 | 2 | 1.9 | 1.7 | 2 | 2.3 |
| Difference | +0.6 | +0.3 | -0.4 | -0.8 | -1.4 | -1.1 | +0.3 | +0.3 | -1.9 | -2.6 | -2.8 | -1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | 2.1 | 2.2 | 2.5 | 2.8 | 2.9 | 2.1 |
| Crested Butte | 2.7 | 2.5 | 2.1 | 2 | 1.5 | 0.9 |
| Difference | +0.6 | +0.3 | -0.4 | -0.8 | -1.4 | -1.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | 1.7 | 1.7 | 3.8 | 4.3 | 4.8 | 3.2 |
| Crested Butte | 2 | 2 | 1.9 | 1.7 | 2 | 2.3 |
| Difference | +0.3 | +0.3 | -1.9 | -2.6 | -2.8 | -1 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siena | — | — | — | — | — | — | — | — | — | — | — | — |
| Crested Butte | 41.7 | 35.3 | 27.3 | 18 | 6.9 | 0.3 | 0 | 0 | 1 | 8.1 | 26.1 | 34.6 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | — | — | — | — | — | — |
| Crested Butte | 41.7 | 35.3 | 27.3 | 18 | 6.9 | 0.3 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | — | — | — | — | — | — |
| Crested Butte | 0 | 0 | 1 | 8.1 | 26.1 | 34.6 |
| Difference | — | — | — | — | — | — |
Cloud cover (%) Siena runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siena | 65 | 61 | 62 | 65 | 62 | 50 | 36 | 39 | 53 | 62 | 69 | 65 |
| Crested Butte | 54 | 60 | 60 | 63 | 61 | 46 | 57 | 58 | 46 | 44 | 49 | 54 |
| Difference | -11 | -1 | -2 | -2 | -1 | -4 | +21 | +19 | -7 | -19 | -21 | -11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | 65 | 61 | 62 | 65 | 62 | 50 |
| Crested Butte | 54 | 60 | 60 | 63 | 61 | 46 |
| Difference | -11 | -1 | -2 | -2 | -1 | -4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | 36 | 39 | 53 | 62 | 69 | 65 |
| Crested Butte | 57 | 58 | 46 | 44 | 49 | 54 |
| Difference | +21 | +19 | -7 | -19 | -21 | -11 |
Relative humidity (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siena | 91 | 86 | 82 | 78 | 73 | 63 | 54 | 55 | 68 | 80 | 89 | 91 |
| Crested Butte | 91 | 94 | 89 | 76 | 64 | 52 | 56 | 59 | 57 | 63 | 77 | 89 |
| Difference | +1 | +7 | +8 | -2 | -9 | -11 | +2 | +4 | -11 | -18 | -12 | -2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | 91 | 86 | 82 | 78 | 73 | 63 |
| Crested Butte | 91 | 94 | 89 | 76 | 64 | 52 |
| Difference | +1 | +7 | +8 | -2 | -9 | -11 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | 54 | 55 | 68 | 80 | 89 | 91 |
| Crested Butte | 56 | 59 | 57 | 63 | 77 | 89 |
| Difference | +2 | +4 | -11 | -18 | -12 | -2 |
How both climates are changing
Both cities are warming. Each city has its own warming trend; see its trends page for the year-by-year detail. Siena trends → · Crested Butte trends →
Methodology & sources
Siena
Temperature & precipitation — the official 1991–2020 climate normals from the WMO's CLINO 1991–2020 collection, measured at Arezzo, about 45 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.
Crested Butte
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Crested Butte, a weather station, about 1 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.
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