Miller Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Miller Lake 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
31%
23629
6%
81017
5%
23532
34%
23532
7%
68851

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
10%
943
1%
4740
0%
926
11%
926
1%
4416
January11th to 20thNight
10%
946
0%
4440
0%
930
10%
930
1%
4272
January21st to endNight
20%
844
1%
4547
1%
829
22%
829
1%
4137
February1st to 10thNight
15%
760
4%
2470
2%
760
18%
760
4%
2205
February11th to 20thNight
19%
741
3%
2405
1%
740
22%
740
3%
2184
February21st to endNight
18%
628
5%
1917
1%
628
22%
628
6%
1642
March1st to 10thNight
25%
723
9%
2064
5%
723
29%
723
10%
1704
March11th to 20thNight
26%
720
11%
1980
6%
720
30%
720
10%
1637
March21st to endNight
34%
792
11%
2178
6%
792
38%
792
13%
1752
April1st to 10thNight
29%
706
10%
1886
4%
706
34%
706
14%
1487
April11th to 20thNight
36%
533
14%
1597
7%
533
41%
533
13%
1237
April21st to endNight
35%
540
11%
1620
6%
540
39%
540
11%
1301
May1st to 10thNight
44%
540
9%
1620
6%
540
47%
540
13%
1274
May11th to 20thNight
49%
432
15%
1494
14%
432
54%
432
13%
1115
May21st to endNight
52%
388
11%
1543
14%
388
56%
388
14%
1084
June1st to 10thNight
45%
360
8%
1260
8%
360
49%
360
10%
986
June11th to 20thNight
57%
360
11%
1260
13%
360
60%
360
15%
921
June21st to endNight
55%
360
9%
1260
10%
360
58%
360
12%
977
July1st to 10thNight
68%
350
11%
1225
12%
350
71%
350
17%
851
July11th to 20thNight
58%
384
12%
1254
12%
384
62%
384
14%
925
July21st to endNight
64%
591
11%
1632
10%
558
64%
558
16%
1236
August1st to 10thNight
62%
537
9%
1600
8%
534
63%
534
15%
1202
August11th to 20thNight
63%
534
13%
1598
9%
534
65%
534
18%
1135
August21st to endNight
52%
594
11%
1782
7%
594
54%
594
15%
1329
September1st to 10thNight
56%
701
10%
1812
6%
701
57%
701
19%
1379
September11th to 20thNight
54%
720
12%
1980
8%
720
57%
720
17%
1531
September21st to endNight
44%
720
11%
1980
7%
720
46%
720
13%
1598
October1st to 10thNight
36%
720
10%
2126
8%
720
40%
720
11%
1716
October11th to 20thNight
25%
720
5%
2160
3%
720
28%
720
6%
1908
October21st to endNight
19%
792
4%
2467
3%
792
22%
792
4%
2215
November1st to 10thNight
26%
740
7%
2445
6%
740
29%
740
6%
2049
November11th to 20thNight
18%
760
5%
2660
5%
760
20%
760
4%
2356
November21st to endNight
14%
760
2%
2660
2%
760
15%
760
3%
2431
December1st to 10thNight
10%
760
0%
2660
0%
760
10%
760
1%
2550
December11th to 20thNight
8%
893
1%
3465
0%
892
9%
892
1%
3178
December21st to endNight
8%
1037
0%
5230
0%
1026
8%
1026
0%
4931

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
15%11%5%8%6%35%45%6%31%
78210
Night
16%13%6%10%7%45%45%6%26%
81210
TransparencyDay
36%37%8%12%6%1
77915
Night
43%35%7%9%5%1
81040
SeeingDay
19%10%27%27%14%3
14206
Night
21%12%27%26%12%2
23658

By Month

Percentage Cloud Cover NE (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
17%21%14%15%10%433327%
2212
11th to 20thDay
11%20%12%24%14%443224
2530
21st to endDay
20%20%10%13%8%5%5%4448%
3095
February1st to 10thDay
14%20%7%14%11%35%435%15%
1710
11th to 20thDay
11%15%9%11%9%5%6%5%5%6%19%
1663
21st to endDay
14%17%6%10%7%46%445%21%
1536
March1st to 10thDay
13%9%48%7%45%46%6%33%
1900
11th to 20thDay
13%11%5%10%6%45%45%5%32%
1980
21st to endDay
16%9%47%6%35%5%5%5%35%
2178
April1st to 10thDay
19%11%5%7%6%35%45%6%30%
2088
11th to 20thDay
17%9%35%5%3445%6%39%
2312
21st to endDay
19%8%46%43445%6%36%
2340
May1st to 10thDay
17%7%36%4345%6%8%38%
2340
11th to 20thDay
15%7%35%5%34447%44%
2396
21st to endDay
11%5%25%5%245%6%8%48%
2729
June1st to 10thDay
12%6%35%5%35%6%6%7%42%
2700
11th to 20thDay
10%5%26%5%35%5%5%10%44%
2700
21st to endDay
12%7%35%5%345%6%8%43%
2700
July1st to 10thDay
8%5%244345%6%9%51%
2700
11th to 20thDay
9%5%35%435%5%5%8%46%
2661
21st to endDay
9%425%5%345%7%8%48%
2587
August1st to 10thDay
12%5%2443446%8%49%
2327
11th to 20thDay
10%425%5%25%5%7%9%46%
2303
21st to endDay
12%8%26%5%25%6%5%9%40%
2574
September1st to 10thDay
12%6%26%5%35%45%9%42%
2126
11th to 20thDay
12%5%25%445%6%5%8%44%
1980
21st to endDay
17%7%46%5%45%5%5%7%36%
1980
October1st to 10thDay
18%9%46%6%35%5%6%5%33%
1832
11th to 20thDay
25%13%48%7%345%46%21%
1800
21st to endDay
27%14%5%8%6%35%446%18%
1886
November1st to 10thDay
18%14%5%10%6%35%5%5%6%22%
1630
11th to 20thDay
18%16%5%9%8%5%6%6%5%6%17%
1520
21st to endDay
21%22%7%10%8%35%6%3411%
1520
December1st to 10thDay
17%25%8%15%9%45%4438%
1520
11th to 20thDay
19%22%7%14%9%3434410%
1724
21st to endDay
27%23%7%16%7%333335%
2431
January1st to 10thNight
16%20%10%17%12%444337%
4741
11th to 20thNight
15%15%10%19%16%5%44336%
4440
21st to endNight
16%18%8%14%9%5%5%5%4411%
4560
February1st to 10thNight
12%18%8%14%11%4445%6%15%
2470
11th to 20thNight
13%15%7%12%8%46%5%5%5%20%
2403
21st to endNight
15%13%7%10%6%45%5%5%5%24%
1917
March1st to 10thNight
13%12%47%7%45%5%5%5%33%
2054
11th to 20thNight
14%11%5%8%6%25%45%5%34%
1979
21st to endNight
15%8%48%6%445%5%6%36%
2178
April1st to 10thNight
20%9%46%5%35%45%5%33%
1886
11th to 20thNight
18%8%35%5%25%45%7%38%
1597
21st to endNight
19%10%37%5%25%45%6%33%
1620
May1st to 10thNight
14%8%36%5%46%45%7%37%
1620
11th to 20thNight
14%6%35%5%45%5%5%6%41%
1493
21st to endNight
10%5%36%5%35%46%7%46%
1542
June1st to 10thNight
12%6%35%6%46%448%40%
1260
11th to 20thNight
10%6%245%35%6%5%10%43%
1260
21st to endNight
11%6%36%5%45%6%6%9%40%
1260
July1st to 10thNight
7%4234345%6%10%53%
1260
11th to 20thNight
7%5%35%6%36%5%6%9%45%
1296
21st to endNight
7%5%34435%5%6%8%50%
1728
August1st to 10thNight
8%5%344345%6%7%50%
1611
11th to 20thNight
8%5%24436%5%6%9%48%
1598
21st to endNight
12%6%36%5%345%6%7%44%
1782
September1st to 10thNight
11%425%435%5%6%9%46%
1812
11th to 20thNight
11%5%25%4346%6%7%46%
1980
21st to endNight
16%7%46%6%45%447%37%
1980
October1st to 10thNight
19%8%38%6%45%45%6%33%
2126
11th to 20thNight
23%11%49%7%3446%7%22%
2160
21st to endNight
25%13%5%9%7%35%45%419%
2467
November1st to 10thNight
18%12%6%8%7%45%5%5%6%25%
2445
11th to 20thNight
16%17%6%11%8%45%45%6%18%
2660
21st to endNight
22%19%6%10%8%45%45%6%12%
2660
December1st to 10thNight
19%22%9%13%9%35%4448%
2660
11th to 20thNight
17%21%7%15%9%45%44411%
3469
21st to endNight
24%20%9%16%8%343237%
5236

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
66%28%42
2213
11th to 20thDay
72%25%21
2530
21st to endDay
64%27%5%31
3095
February1st to 10thDay
51%37%5%7%1
1710
11th to 20thDay
48%38%7%6%2
1672
21st to endDay
44%37%7%10%2
1536
March1st to 10thDay
34%38%9%13%41
1903
11th to 20thDay
35%38%9%12%6%1
1980
21st to endDay
33%38%8%12%7%1
2178
April1st to 10thDay
33%39%8%13%7%1
2088
11th to 20thDay
30%37%6%15%11%1
2312
21st to endDay
32%38%8%12%8%2
2340
May1st to 10thDay
27%38%7%16%10%2
2340
11th to 20thDay
28%38%6%15%13%1
2400
21st to endDay
23%38%10%15%12%2
2729
June1st to 10thDay
26%39%9%16%9%
2700
11th to 20thDay
22%37%8%19%12%
2700
21st to endDay
26%38%11%17%7%1
2700
July1st to 10thDay
20%40%12%17%10%1
2626
11th to 20thDay
21%40%11%19%8%1
2580
21st to endDay
22%42%10%16%10%
2443
August1st to 10thDay
24%38%11%18%7%1
2314
11th to 20thDay
20%38%12%19%10%
2303
21st to endDay
26%39%9%17%9%1
2574
September1st to 10thDay
25%38%9%19%8%1
2126
11th to 20thDay
27%39%12%17%5%
1980
21st to endDay
32%39%9%14%5%
1980
October1st to 10thDay
33%39%8%14%6%
1832
11th to 20thDay
44%38%7%7%4
1800
21st to endDay
45%39%7%7%2
1886
November1st to 10thDay
37%42%8%11%3
1630
11th to 20thDay
42%41%8%5%4
1520
21st to endDay
49%42%6%3
1520
December1st to 10thDay
54%41%32
1520
11th to 20thDay
56%34%6%3
1724
21st to endDay
67%26%5%1
2431
January1st to 10thNight
66%26%6%3
4741
11th to 20thNight
68%26%42
4440
21st to endNight
63%26%7%4
4560
February1st to 10thNight
49%36%6%7%2
2470
11th to 20thNight
50%37%6%5%1
2405
21st to endNight
42%37%10%8%2
1917
March1st to 10thNight
36%37%10%12%5%
2064
11th to 20thNight
35%37%8%12%7%1
1980
21st to endNight
32%37%8%14%7%1
2178
April1st to 10thNight
31%36%8%16%8%1
1886
11th to 20thNight
29%36%6%15%12%1
1597
21st to endNight
33%37%6%11%11%2
1620
May1st to 10thNight
31%37%7%12%10%2
1620
11th to 20thNight
27%38%5%16%12%2
1494
21st to endNight
21%39%10%15%12%3
1543
June1st to 10thNight
32%38%6%13%10%1
1260
11th to 20thNight
24%37%8%17%13%
1260
21st to endNight
28%39%10%15%7%1
1260
July1st to 10thNight
19%39%8%19%14%2
1225
11th to 20thNight
22%40%8%18%10%2
1254
21st to endNight
21%42%9%19%9%
1632
August1st to 10thNight
24%39%11%18%8%1
1600
11th to 20thNight
20%38%13%16%12%1
1598
21st to endNight
25%38%11%17%9%2
1782
September1st to 10thNight
23%38%10%18%10%2
1812
11th to 20thNight
26%38%12%18%6%
1980
21st to endNight
32%38%9%15%6%
1980
October1st to 10thNight
34%37%7%15%7%
2126
11th to 20thNight
44%38%7%8%2
2160
21st to endNight
47%39%6%7%3
2467
November1st to 10thNight
34%43%7%12%3
2445
11th to 20thNight
43%40%8%5%21
2660
21st to endNight
48%40%8%4
2660
December1st to 10thNight
54%41%5%1
2660
11th to 20thNight
55%35%7%3
3468
21st to endNight
66%27%5%1
5236

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
25%20%33%16%41
182
11th to 20thDay
22%17%36%17%7%
270
21st to endDay
29%10%34%21%6%
297
February1st to 10thDay
25%24%29%19%3
270
11th to 20thDay
20%20%38%19%3
270
21st to endDay
26%27%36%10%
225
March1st to 10thDay
19%17%33%24%6%
343
11th to 20thDay
20%14%36%22%6%1
420
21st to endDay
26%10%31%25%7%1
462
April1st to 10thDay
21%11%36%24%8%1
420
11th to 20thDay
25%13%26%18%12%5%
412
21st to endDay
24%11%30%24%9%2
420
May1st to 10thDay
20%6%32%28%12%2
423
11th to 20thDay
17%6%26%30%16%4
447
21st to endDay
13%5%22%36%19%5%
489
June1st to 10thDay
11%328%40%14%3
630
11th to 20thDay
12%5%26%37%17%3
630
21st to endDay
15%5%24%38%16%3
630
July1st to 10thDay
8%421%38%26%3
621
11th to 20thDay
12%422%34%21%6%
618
21st to endDay
10%423%36%22%5%
528
August1st to 10thDay
14%5%18%31%25%6%
446
11th to 20thDay
12%314%38%25%8%
439
21st to endDay
16%7%24%26%22%5%
495
September1st to 10thDay
15%6%22%30%20%7%
450
11th to 20thDay
11%6%24%28%24%6%
450
21st to endDay
18%13%20%26%19%5%
450
October1st to 10thDay
23%13%24%22%15%2
450
11th to 20thDay
26%18%30%19%6%1
450
21st to endDay
31%17%29%19%31
401
November1st to 10thDay
25%18%34%18%4
250
11th to 20thDay
23%24%32%18%21
180
21st to endDay
26%23%37%13%1
180
December1st to 10thDay
31%22%31%12%5%
180
11th to 20thDay
29%24%31%13%2
180
21st to endDay
34%22%36%6%21
198
January1st to 10thNight
24%20%31%19%5%1
950
11th to 20thNight
28%18%29%19%6%1
950
21st to endNight
20%14%31%24%9%2
851
February1st to 10thNight
19%21%34%20%5%
760
11th to 20thNight
20%13%36%22%8%
743
21st to endNight
22%16%34%23%4
628
March1st to 10thNight
17%15%33%27%7%1
723
11th to 20thNight
18%15%34%23%9%1
720
21st to endNight
20%8%29%31%11%1
792
April1st to 10thNight
25%11%29%29%6%1
706
11th to 20thNight
21%11%27%26%12%2
533
21st to endNight
23%11%24%27%15%1
540
May1st to 10thNight
17%424%37%17%1
540
11th to 20thNight
16%5%21%34%21%1
432
21st to endNight
14%321%39%20%3
389
June1st to 10thNight
17%324%37%16%3
360
11th to 20thNight
13%420%41%20%2
360
21st to endNight
12%5%21%35%26%1
360
July1st to 10thNight
8%5%13%49%23%3
350
11th to 20thNight
11%221%35%29%3
384
21st to endNight
9%417%43%26%2
591
August1st to 10thNight
11%317%37%28%4
537
11th to 20thNight
11%6%14%31%31%7%
534
21st to endNight
14%322%30%25%4
594
September1st to 10thNight
13%6%18%33%23%7%
701
11th to 20thNight
13%6%22%31%22%6%
720
21st to endNight
20%9%21%24%20%6%
720
October1st to 10thNight
23%8%26%24%18%2
720
11th to 20thNight
28%15%24%22%8%2
720
21st to endNight
33%14%28%21%41
792
November1st to 10thNight
27%17%26%22%7%1
740
11th to 20thNight
26%22%27%19%7%
760
21st to endNight
32%18%28%18%4
760
December1st to 10thNight
32%22%28%12%6%
760
11th to 20thNight
27%23%33%14%3
893
21st to endNight
34%17%31%15%4
1045
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