AllSky Camera - 108 Mile Ranch
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the AllSky Camera - 108 Mile Ranch clear sky chart from 2005-11-06 to 2024-03-01.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
36%
23282
10%
81268
7%
23160
40%
23160
14%
58420

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
17%
846
8%
4708
3%
821
22%
821
5%
3657
January11th to 20thNight
27%
843
13%
4655
5%
820
32%
820
7%
3271
January21st to endNight
29%
860
6%
4968
6%
840
35%
840
7%
3689
February1st to 10thNight
24%
760
9%
2600
7%
760
28%
760
11%
2018
February11th to 20thNight
33%
741
12%
2404
8%
740
39%
740
15%
1761
February21st to endNight
35%
628
13%
1997
11%
628
40%
628
16%
1431
March1st to 10thNight
33%
722
13%
2165
9%
722
39%
722
16%
1587
March11th to 20thNight
31%
720
15%
2011
8%
720
37%
720
19%
1449
March21st to endNight
40%
792
11%
2059
6%
792
41%
792
19%
1540
April1st to 10thNight
38%
720
10%
1800
4%
720
40%
720
19%
1365
April11th to 20thNight
37%
642
13%
1710
7%
642
41%
642
19%
1264
April21st to endNight
36%
370
14%
1450
13%
370
43%
370
15%
981
May1st to 10thNight
39%
360
10%
1440
13%
360
43%
360
15%
959
May11th to 20thNight
41%
354
9%
1416
11%
354
44%
354
15%
971
May21st to endNight
41%
388
4%
1384
2%
388
41%
388
15%
988
June1st to 10thNight
37%
360
1%
1080
0%
360
37%
360
16%
796
June11th to 20thNight
36%
360
0%
1080
0%
360
36%
360
14%
839
June21st to endNight
46%
360
0%
1080
0%
360
46%
360
19%
763
July1st to 10thNight
49%
350
0%
1128
0%
350
49%
350
20%
753
July11th to 20thNight
52%
348
4%
1218
1%
348
53%
348
20%
785
July21st to endNight
60%
394
10%
1395
12%
372
63%
372
29%
771
August1st to 10thNight
66%
358
14%
1424
23%
356
68%
356
25%
790
August11th to 20thNight
67%
392
21%
1460
28%
392
71%
392
32%
758
August21st to endNight
54%
669
16%
1857
11%
669
56%
669
27%
1204
September1st to 10thNight
55%
720
18%
1800
9%
720
57%
720
34%
1160
September11th to 20thNight
57%
720
21%
1800
12%
720
59%
720
34%
1170
September21st to endNight
43%
720
17%
2039
10%
720
48%
720
24%
1370
October1st to 10thNight
43%
720
13%
2160
11%
720
46%
720
22%
1442
October11th to 20thNight
38%
720
14%
2179
12%
720
43%
720
19%
1546
October21st to endNight
29%
792
12%
2602
8%
792
35%
792
16%
1804
November1st to 10thNight
27%
740
9%
2590
5%
740
33%
740
10%
1964
November11th to 20thNight
27%
760
10%
2660
5%
760
33%
760
12%
1989
November21st to endNight
27%
872
8%
2772
5%
872
30%
872
11%
2159
December1st to 10thNight
31%
999
9%
2954
5%
999
35%
999
13%
2297
December11th to 20thNight
24%
1039
5%
3747
3%
1039
27%
1039
8%
3141
December21st to endNight
21%
1143
4%
5476
3%
1114
25%
1114
6%
3988

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
9%10%48%7%46%6%6%8%31%
77731
Night
9%12%5%9%8%46%6%6%7%27%
81614
TransparencyDay
51%5%15%20%8%1
77436
Night
55%5%14%18%7%1
81489
SeeingDay
16%14%25%26%16%5%
14900
Night
16%12%25%28%16%2
23310

By Month

Percentage Cloud Cover NW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
7%18%7%14%10%46%6%7%6%14%
2219
11th to 20thDay
9%13%5%9%6%45%7%9%8%24%
2199
21st to endDay
8%15%6%12%10%5%6%7%6%7%19%
2676
February1st to 10thDay
9%18%7%12%8%5%45%5%5%23%
1577
11th to 20thDay
7%14%5%9%8%46%6%6%7%27%
1665
21st to endDay
6%12%7%12%9%46%6%6%7%26%
1456
March1st to 10thDay
5%13%6%10%9%5%7%6%6%8%25%
1801
11th to 20thDay
5%11%7%10%10%5%6%7%6%8%26%
1948
21st to endDay
6%13%5%10%9%46%6%7%8%25%
2296
April1st to 10thDay
6%13%7%9%10%5%7%6%7%8%23%
2160
11th to 20thDay
9%12%6%11%9%46%6%6%7%25%
2196
21st to endDay
9%10%48%9%6%8%7%6%8%26%
2510
May1st to 10thDay
10%11%48%7%5%5%5%6%8%30%
2520
11th to 20thDay
10%10%47%7%46%6%7%8%31%
2477
21st to endDay
13%9%48%8%46%6%6%8%29%
2887
June1st to 10thDay
16%10%48%8%46%6%6%6%26%
2880
11th to 20thDay
15%9%49%9%46%6%6%7%24%
2880
21st to endDay
11%8%47%7%46%7%6%7%34%
2880
July1st to 10thDay
9%7%36%6%46%6%6%8%39%
2794
11th to 20thDay
7%5%26%6%46%6%7%9%43%
2700
21st to endDay
6%5%24435%5%7%8%51%
2840
August1st to 10thDay
7%425%5%346%6%8%49%
2507
11th to 20thDay
5%4245%35%5%6%9%52%
2436
21st to endDay
10%5%26%6%46%6%7%9%38%
2499
September1st to 10thDay
9%6%25%5%3446%7%48%
2160
11th to 20thDay
12%6%36%5%445%5%8%41%
2160
21st to endDay
13%8%36%6%46%6%5%8%35%
1917
October1st to 10thDay
12%11%36%6%345%6%6%38%
1800
11th to 20thDay
15%8%37%6%45%5%5%7%34%
1780
21st to endDay
14%13%48%5%36%5%6%6%29%
1751
November1st to 10thDay
12%15%6%11%7%46%6%6%6%22%
1488
11th to 20thDay
11%11%5%10%9%5%7%6%6%8%23%
1520
21st to endDay
8%17%6%10%9%5%7%6%7%8%18%
1387
December1st to 10thDay
9%13%6%10%9%6%6%8%7%7%19%
1224
11th to 20thDay
6%15%6%13%9%6%8%8%6%8%16%
1442
21st to endDay
6%15%6%9%9%5%7%6%7%8%22%
2099
January1st to 10thNight
9%17%6%16%9%5%6%5%6%6%15%
4744
11th to 20thNight
7%14%7%12%8%45%6%7%7%23%
4699
21st to endNight
8%14%6%11%9%5%7%7%7%7%18%
4978
February1st to 10thNight
9%18%8%12%8%5%5%45%6%22%
2600
11th to 20thNight
7%13%410%9%5%5%5%6%6%29%
2402
21st to endNight
5%13%7%9%9%5%7%5%6%7%28%
1997
March1st to 10thNight
5%15%5%9%7%47%6%6%8%27%
2165
11th to 20thNight
411%5%9%8%5%7%7%7%7%30%
2010
21st to endNight
5%12%5%8%8%5%8%7%7%8%27%
2059
April1st to 10thNight
6%11%6%10%9%5%7%6%6%7%29%
1800
11th to 20thNight
6%11%6%9%8%46%7%6%8%28%
1710
21st to endNight
8%10%5%8%8%48%5%5%8%31%
1450
May1st to 10thNight
10%12%5%10%7%345%6%6%32%
1440
11th to 20thNight
11%8%5%8%8%5%7%6%5%8%29%
1416
21st to endNight
13%9%48%8%47%6%9%8%24%
1384
June1st to 10thNight
15%9%48%7%46%6%7%8%27%
1080
11th to 20thNight
17%10%5%8%8%46%6%8%7%21%
1080
21st to endNight
10%8%47%9%5%7%5%6%6%32%
1080
July1st to 10thNight
10%6%46%7%46%6%7%9%34%
1162
11th to 20thNight
8%6%37%7%5%6%7%8%8%33%
1260
21st to endNight
7%425%5%45%7%6%9%45%
1477
August1st to 10thNight
5%427%7%36%6%6%6%47%
1432
11th to 20thNight
6%6%33435%5%6%9%50%
1460
21st to endNight
8%7%26%7%46%5%8%9%36%
1857
September1st to 10thNight
9%5%25%6%35%47%7%46%
1800
11th to 20thNight
10%6%26%5%35%5%7%8%43%
1800
21st to endNight
12%9%36%5%35%6%6%8%38%
2039
October1st to 10thNight
11%10%47%6%35%5%47%37%
2160
11th to 20thNight
12%10%38%8%46%5%6%8%30%
2179
21st to endNight
13%11%47%6%35%5%6%7%31%
2602
November1st to 10thNight
14%14%49%8%46%6%7%8%21%
2590
11th to 20thNight
10%12%6%10%9%46%6%6%7%25%
2660
21st to endNight
8%16%6%10%9%5%7%5%6%7%21%
2772
December1st to 10thNight
10%13%5%10%9%48%6%6%6%22%
2954
11th to 20thNight
8%18%8%12%11%5%6%6%5%6%14%
3750
21st to endNight
7%13%6%11%10%6%7%6%6%7%22%
5566

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
68%5%13%12%2
2219
11th to 20thDay
55%5%20%8%47%
2220
21st to endDay
62%6%16%13%2
2676
February1st to 10thDay
65%311%12%8%
1577
11th to 20thDay
55%5%16%15%9%
1674
21st to endDay
57%6%14%17%6%
1456
March1st to 10thDay
57%6%12%14%11%
1801
11th to 20thDay
55%414%19%7%
1948
21st to endDay
55%6%15%19%5%
2296
April1st to 10thDay
59%7%12%15%7%
2160
11th to 20thDay
58%5%10%17%9%1
2196
21st to endDay
55%6%11%19%9%1
2510
May1st to 10thDay
52%5%13%18%11%1
2520
11th to 20thDay
49%414%23%9%1
2480
21st to endDay
53%5%13%20%8%1
2888
June1st to 10thDay
57%6%9%15%10%3
2880
11th to 20thDay
59%6%13%17%6%
2880
21st to endDay
47%5%16%20%9%2
2880
July1st to 10thDay
41%5%15%23%14%2
2719
11th to 20thDay
36%7%15%27%13%2
2619
21st to endDay
29%5%16%33%16%2
2682
August1st to 10thDay
32%5%18%32%12%1
2490
11th to 20thDay
29%5%20%31%13%2
2436
21st to endDay
40%6%19%25%7%2
2499
September1st to 10thDay
36%420%28%9%3
2160
11th to 20thDay
43%414%27%10%2
2160
21st to endDay
48%5%15%20%10%1
1917
October1st to 10thDay
47%5%20%24%4
1800
11th to 20thDay
49%318%23%6%
1780
21st to endDay
54%5%16%20%5%
1751
November1st to 10thDay
60%6%13%15%6%
1488
11th to 20thDay
59%6%15%15%4
1520
21st to endDay
63%6%13%12%5%
1387
December1st to 10thDay
62%8%14%14%2
1224
11th to 20thDay
66%7%16%9%3
1444
21st to endDay
59%5%16%15%5%
2099
January1st to 10thNight
69%312%13%3
4744
11th to 20thNight
58%5%15%11%6%5%
4740
21st to endNight
62%7%17%12%3
4978
February1st to 10thNight
65%411%13%7%1
2600
11th to 20thNight
56%5%13%18%7%1
2404
21st to endNight
54%5%14%19%7%1
1997
March1st to 10thNight
53%6%14%17%9%1
2165
11th to 20thNight
51%5%13%23%8%1
2011
21st to endNight
53%6%17%18%5%
2059
April1st to 10thNight
53%6%14%19%7%
1800
11th to 20thNight
53%6%11%21%10%
1710
21st to endNight
51%5%10%22%11%1
1450
May1st to 10thNight
51%5%14%20%9%1
1440
11th to 20thNight
53%5%13%20%8%1
1416
21st to endNight
54%6%15%17%7%1
1384
June1st to 10thNight
53%7%8%20%8%3
1080
11th to 20thNight
60%6%13%14%6%
1080
21st to endNight
51%5%13%21%8%2
1080
July1st to 10thNight
47%6%13%20%12%2
1128
11th to 20thNight
44%7%15%22%10%2
1218
21st to endNight
33%6%16%28%15%2
1395
August1st to 10thNight
35%6%14%29%15%1
1424
11th to 20thNight
30%5%19%29%15%2
1460
21st to endNight
42%5%17%26%9%1
1857
September1st to 10thNight
35%6%16%29%12%2
1800
11th to 20thNight
37%5%15%27%12%4
1800
21st to endNight
43%6%17%22%11%1
2039
October1st to 10thNight
47%316%26%7%
2160
11th to 20thNight
51%6%14%23%6%
2179
21st to endNight
51%5%16%22%6%
2602
November1st to 10thNight
60%7%14%14%5%
2590
11th to 20thNight
57%7%15%13%7%1
2660
21st to endNight
63%5%14%12%6%
2772
December1st to 10thNight
60%5%16%13%5%
2954
11th to 20thNight
69%7%12%9%3
3747
21st to endNight
62%5%15%13%5%
5566

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
18%20%36%16%7%3
180
11th to 20thDay
12%23%32%19%12%1
180
21st to endDay
23%16%30%22%9%1
198
February1st to 10thDay
22%21%32%18%6%2
237
11th to 20thDay
15%15%31%28%11%1
365
21st to endDay
11%21%32%21%12%3
328
March1st to 10thDay
16%21%27%19%14%2
421
11th to 20thDay
15%23%29%20%10%3
420
21st to endDay
18%23%26%20%11%4
462
April1st to 10thDay
18%22%25%24%9%2
420
11th to 20thDay
18%24%21%19%11%7%
412
21st to endDay
16%15%28%25%13%4
420
May1st to 10thDay
13%17%28%25%13%4
423
11th to 20thDay
15%10%23%27%20%5%
448
21st to endDay
18%10%21%30%17%4
649
June1st to 10thDay
19%13%28%24%12%3
810
11th to 20thDay
20%11%23%29%15%2
810
21st to endDay
13%9%23%28%21%6%
810
July1st to 10thDay
12%8%24%29%21%6%
714
11th to 20thDay
10%9%23%32%21%5%
618
21st to endDay
8%5%20%36%24%7%
586
August1st to 10thDay
8%5%15%36%26%10%
447
11th to 20thDay
8%8%22%31%21%10%
437
21st to endDay
13%7%24%27%21%8%
495
September1st to 10thDay
12%12%26%30%13%7%
450
11th to 20thDay
15%11%18%27%23%6%
450
21st to endDay
20%12%27%24%13%4
450
October1st to 10thDay
22%11%22%21%17%7%
450
11th to 20thDay
22%18%23%20%13%4
430
21st to endDay
23%17%28%18%12%1
282
November1st to 10thDay
23%22%30%16%7%2
180
11th to 20thDay
22%18%23%22%12%3
180
21st to endDay
18%19%29%19%10%4
180
December1st to 10thDay
14%12%26%29%14%5%
180
11th to 20thDay
13%21%28%21%13%4
180
21st to endDay
16%18%34%20%10%2
198
January1st to 10thNight
22%15%32%21%9%1
855
11th to 20thNight
19%13%28%28%12%1
850
21st to endNight
15%16%29%26%11%2
866
February1st to 10thNight
19%16%30%23%11%1
760
11th to 20thNight
14%11%29%35%9%1
744
21st to endNight
14%12%27%31%14%2
628
March1st to 10thNight
15%15%27%27%14%2
722
11th to 20thNight
12%17%33%25%12%2
720
21st to endNight
13%17%22%27%19%3
792
April1st to 10thNight
13%11%26%29%17%3
720
11th to 20thNight
12%10%29%29%18%2
642
21st to endNight
12%14%30%28%14%3
370
May1st to 10thNight
14%12%23%31%18%2
360
11th to 20thNight
15%9%22%33%18%3
354
21st to endNight
18%8%22%27%23%3
389
June1st to 10thNight
18%9%26%30%15%1
360
11th to 20thNight
20%8%23%30%17%1
360
21st to endNight
13%6%22%34%21%5%
360
July1st to 10thNight
13%7%19%32%27%2
350
11th to 20thNight
9%7%21%33%26%3
348
21st to endNight
9%6%18%32%30%5%
394
August1st to 10thNight
6%313%34%37%6%
358
11th to 20thNight
8%411%36%35%5%
392
21st to endNight
12%7%19%30%27%5%
669
September1st to 10thNight
12%7%20%36%23%3
720
11th to 20thNight
14%5%16%30%29%6%
720
21st to endNight
18%11%24%30%15%3
720
October1st to 10thNight
20%11%19%29%19%3
720
11th to 20thNight
18%12%24%28%16%2
720
21st to endNight
22%13%30%22%11%2
792
November1st to 10thNight
25%15%24%25%9%2
740
11th to 20thNight
21%15%29%24%9%1
760
21st to endNight
20%17%27%26%9%2
872
December1st to 10thNight
17%15%25%29%13%2
999
11th to 20thNight
19%16%29%27%8%1
1040
21st to endNight
18%16%31%26%9%1
1144
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