Silverthorne, Colorado, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Silverthorne, Colorado, United States
AQI Trends: Highest and Lowest
Same Day Analysis (25th October ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 1st highest AQI at 16 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 25th Oct - 26th Oct 2025
Silverthorne, Colorado, United States
7 AM25th Oct 2025
6 PM
6 AM26th Oct 2025
17AQI
11AQI
23AQI
11AQI
In the last 24 hours,
Silverthorne's AQI reached its highest point of 23 at 8 PM during the Night, while the lowest point, 11, was recorded at 6 AM during the Night between 25th Oct and 26th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Silverthorne, Colorado, United States
12°C7/19°C
13°C9/20°C
11°C8/16°C
10°C7/15°C
11°C7/16°C
11°C4/16°C
13°C7/19°C
14°C8/20°C
9°C3/13°C
6°C2/12°C
8°C3/13°C
8°C3/15°C
11°C6/17°C
12°C9/19°C
11°C9/13°C
10°C8/12°C
5°C1/9°C
4°C-2/12°C
9°C3/16°C
11°C7/17°C
5°C1/9°C
2°C-3/7°C
3°C0/7°C
6°C-1/14°C
2°C-1/6°C
4°C-4/12°C
7°C3/14°C
6°C1/12°C
3°C-2/10°C
5°C-3/12°C
--°C/°C
22AQI
12AQI
24AQI
12AQI
2025 Days Vs Air Quality
Silverthorne, Colorado, United States
98%
293
2%
5
Total number of days with different AQI categories in last 299 days in 2025 (66 days remaining)
Under WHO’s Safe Air Quality Limits: 98%
Health Risk Level:
Very Low
In 2025, 98% of 299 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Silverthorne, Colorado, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
33AQI
34AQI
27AQI
25AQI
23AQI
21AQI
25AQI
26AQI
25AQI
27AQI
26AQI
27AQI
31AQI
30AQI
26AQI
28AQI
26AQI
22AQI
22AQI
28AQI
29AQI
25AQI
25AQI
24AQI
23AQI
25AQI
29AQI
29AQI
33AQI
29AQI
28AQI
24AQI
20AQI
30AQI
28AQI
26AQI
26AQI
26AQI
23AQI
25AQI
24AQI
26AQI
26AQI
20AQI
20AQI
17AQI
17AQI
16AQI
19AQI
18AQI
20AQI
22AQI
19AQI
15AQI
16AQI
17AQI
19AQI
19AQI
20AQI
24AQI
26AQI
21AQI
23AQI
18AQI
15AQI
19AQI
17AQI
16AQI
20AQI
20AQI
15AQI
22AQI
27AQI
20AQI
19AQI
30AQI
24AQI
20AQI
21AQI
19AQI
17AQI
16AQI
17AQI
23AQI
27AQI
27AQI
38AQI
28AQI
29AQI
27AQI
20AQI
18AQI
18AQI
17AQI
14AQI
16AQI
21AQI
21AQI
30AQI
32AQI
34AQI
22AQI
23AQI
21AQI
20AQI
22AQI
21AQI
16AQI
17AQI
14AQI
16AQI
18AQI
18AQI
16AQI
15AQI
17AQI
19AQI
16AQI
16AQI
15AQI
16AQI
19AQI
19AQI
19AQI
18AQI
22AQI
20AQI
19AQI
20AQI
21AQI
21AQI
23AQI
26AQI
21AQI
17AQI
18AQI
17AQI
18AQI
17AQI
18AQI
16AQI
19AQI
19AQI
19AQI
18AQI
18AQI
19AQI
20AQI
19AQI
22AQI
23AQI
20AQI
18AQI
16AQI
19AQI
18AQI
18AQI
21AQI
25AQI
27AQI
26AQI
25AQI
21AQI
24AQI
27AQI
25AQI
24AQI
23AQI
23AQI
23AQI
28AQI
35AQI
34AQI
21AQI
21AQI
23AQI
22AQI
29AQI
29AQI
26AQI
23AQI
25AQI
24AQI
23AQI
22AQI
26AQI
22AQI
20AQI
21AQI
22AQI
28AQI
50AQI
35AQI
26AQI
25AQI
30AQI
45AQI
40AQI
40AQI
30AQI
26AQI
24AQI
22AQI
23AQI
34AQI
32AQI
30AQI
34AQI
31AQI
30AQI
35AQI
38AQI
32AQI
24AQI
24AQI
42AQI
49AQI
45AQI
34AQI
28AQI
32AQI
39AQI
60AQI
50AQI
58AQI
56AQI
46AQI
30AQI
23AQI
22AQI
19AQI
28AQI
36AQI
32AQI
32AQI
35AQI
39AQI
36AQI
23AQI
20AQI
29AQI
29AQI
30AQI
34AQI
29AQI
35AQI
49AQI
52AQI
57AQI
44AQI
40AQI
27AQI
21AQI
15AQI
14AQI
14AQI
16AQI
19AQI
18AQI
16AQI
17AQI
18AQI
19AQI
17AQI
15AQI
15AQI
15AQI
20AQI
16AQI
18AQI
20AQI
14AQI
14AQI
13AQI
16AQI
22AQI
15AQI
9AQI
6AQI
33AQI
34AQI
21AQI
18AQI
21AQI
12AQI
16AQI
15AQI
23AQI
19AQI
12AQI
18AQI
17AQI
20AQI
25AQI
29AQI
30AQI
22AQI
16AQI
27AQI
21AQI
22AQI
19AQI
19AQI
24AQI
29AQI
35AQI
24AQI
19AQI
No. of days
202524AQI
Highest AQI recorded in
August35AQI
Lowest AQI recorded in
October19AQI
202427AQI
Highest AQI recorded in
September43AQI
Lowest AQI recorded in
April4AQI
20236AQI
Highest AQI recorded in
November7AQI
Lowest AQI recorded in
December6AQI
202063AQI
Highest AQI recorded in
August63AQI
Lowest AQI recorded in
August63AQI
Most & Least Polluted Years Over the Last 4 Years
Silverthorne's annual 2025 AQI (24) shows an average percentage change of 83.9% (worsened AQI) compared to previous years: 2020 (63), 2023 (6), 2024 (27).