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Siena vs Breckenridge
Comparing Siena change · Breckenridge change
Siena is the warmer of the two — about 13°C on the annual average; Siena is the wetter, with 133 mm more rain a year.
How the seasons compare
The differences between Siena and Breckenridge, in everyday terms.
Summers
Siena has far hotter summers
Siena: Hot
Breckenridge: Mild
Winters
Siena has far milder winters
Siena: Chilly
Breckenridge: Bitterly cold
Rain & snow
Siena is wetter
Siena: Moderate rainfall
Breckenridge: Moderate rainfall
Sky
Similar amounts of sun
Siena: Partly cloudy
Breckenridge: Partly cloudy
Month-by-month charts
Temperature
Siena is the warmer of the two — about 13°C on the annual average.
Precipitation
Siena is the wetter — about 133 mm 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 (°C) Siena runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siena | 9 | 11 | 15 | 19 | 23 | 28 | 31 | 32 | 26 | 20 | 14 | 10 |
| Breckenridge | -2 | -0 | 4 | 7 | 12 | 18 | 21 | 19 | 16 | 9 | 3 | -2 |
| Difference | -11 | -11 | -11 | -12 | -11 | -10 | -11 | -12 | -10 | -11 | -11 | -12 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | 9 | 11 | 15 | 19 | 23 | 28 |
| Breckenridge | -2 | -0 | 4 | 7 | 12 | 18 |
| Difference | -11 | -11 | -11 | -12 | -11 | -10 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | 31 | 32 | 26 | 20 | 14 | 10 |
| Breckenridge | 21 | 19 | 16 | 9 | 3 | -2 |
| Difference | -11 | -12 | -10 | -11 | -11 | -12 |
Avg low (°C) Siena runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siena | 0 | 0 | 3 | 6 | 10 | 13 | 15 | 16 | 12 | 9 | 5 | 1 |
| Breckenridge | -16 | -15 | -12 | -9 | -4 | 0 | 4 | 3 | -1 | -6 | -12 | -16 |
| Difference | -16 | -16 | -15 | -14 | -13 | -13 | -12 | -13 | -12 | -14 | -16 | -17 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | 0 | 0 | 3 | 6 | 10 | 13 |
| Breckenridge | -16 | -15 | -12 | -9 | -4 | 0 |
| Difference | -16 | -16 | -15 | -14 | -13 | -13 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | 15 | 16 | 12 | 9 | 5 | 1 |
| Breckenridge | 4 | 3 | -1 | -6 | -12 | -16 |
| Difference | -12 | -13 | -12 | -14 | -16 | -17 |
Precipitation (mm) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siena | 53 | 57 | 64 | 71 | 74 | 53 | 42 | 43 | 96 | 109 | 121 | 82 |
| Breckenridge | 75 | 73 | 79 | 92 | 62 | 29 | 45 | 56 | 41 | 51 | 65 | 64 |
| Difference | +22 | +16 | +15 | +21 | -12 | -24 | +2 | +13 | -55 | -58 | -56 | -18 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | 53 | 57 | 64 | 71 | 74 | 53 |
| Breckenridge | 75 | 73 | 79 | 92 | 62 | 29 |
| Difference | +22 | +16 | +15 | +21 | -12 | -24 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | 42 | 43 | 96 | 109 | 121 | 82 |
| Breckenridge | 45 | 56 | 41 | 51 | 65 | 64 |
| Difference | +2 | +13 | -55 | -58 | -56 | -18 |
Cloud cover (%) Varies through 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 |
| Breckenridge | 58 | 64 | 64 | 69 | 66 | 50 | 55 | 58 | 48 | 51 | 55 | 59 |
| Difference | -7 | +3 | +3 | +5 | +4 | — | +19 | +19 | -4 | -12 | -14 | -6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | 65 | 61 | 62 | 65 | 62 | 50 |
| Breckenridge | 58 | 64 | 64 | 69 | 66 | 50 |
| Difference | -7 | +3 | +3 | +5 | +4 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | 36 | 39 | 53 | 62 | 69 | 65 |
| Breckenridge | 55 | 58 | 48 | 51 | 55 | 59 |
| Difference | +19 | +19 | -4 | -12 | -14 | -6 |
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 |
| Breckenridge | 92 | 94 | 90 | 77 | 66 | 54 | 56 | 60 | 57 | 63 | 77 | 89 |
| Difference | +2 | +8 | +8 | -1 | -7 | -8 | +3 | +5 | -11 | -17 | -12 | -1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Siena | 91 | 86 | 82 | 78 | 73 | 63 |
| Breckenridge | 92 | 94 | 90 | 77 | 66 | 54 |
| Difference | +2 | +8 | +8 | -1 | -7 | -8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Siena | 54 | 55 | 68 | 80 | 89 | 91 |
| Breckenridge | 56 | 60 | 57 | 63 | 77 | 89 |
| Difference | +3 | +5 | -11 | -17 | -12 | -1 |
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 → · Breckenridge 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.
Breckenridge
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Copper Mountain, a weather station, about 11 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.
← change Siena · change Breckenridge → · Siena page · Breckenridge page