Elk Forest
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Elk Forest clear sky chart from 2005-11-06 to 2024-01-14.

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%
23332
20%
74659
11%
23285
47%
23285
23%
47238

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
19%
759
23%
2649
8%
757
40%
757
20%
1614
January11th to 20thNight
24%
736
21%
2466
9%
736
39%
736
18%
1594
January21st to endNight
21%
792
24%
2574
8%
792
40%
792
22%
1579
February1st to 10thNight
20%
720
17%
2340
7%
720
33%
720
19%
1516
February11th to 20thNight
14%
703
19%
2162
4%
700
34%
700
18%
1405
February21st to endNight
18%
592
24%
1776
8%
592
36%
592
19%
1176
March1st to 10thNight
24%
720
23%
2111
9%
720
41%
720
27%
1280
March11th to 20thNight
23%
720
21%
1980
9%
720
36%
720
23%
1304
March21st to endNight
24%
792
21%
2082
8%
792
35%
792
26%
1421
April1st to 10thNight
23%
720
19%
1800
3%
720
33%
720
26%
1218
April11th to 20thNight
34%
711
20%
1775
7%
711
39%
711
29%
1175
April21st to endNight
30%
720
19%
1800
5%
720
37%
720
27%
1227
May1st to 10thNight
32%
622
15%
1702
6%
622
38%
622
22%
1191
May11th to 20thNight
37%
354
18%
1416
12%
354
46%
354
16%
912
May21st to endNight
51%
388
14%
1551
14%
388
55%
388
18%
975
June1st to 10thNight
52%
360
19%
1440
20%
360
59%
360
22%
852
June11th to 20thNight
50%
360
15%
1440
15%
360
56%
360
21%
887
June21st to endNight
57%
360
17%
1440
19%
360
62%
360
25%
837
July1st to 10thNight
57%
350
14%
1400
16%
350
60%
350
19%
874
July11th to 20thNight
65%
348
16%
1392
19%
348
66%
348
24%
809
July21st to endNight
62%
510
17%
1596
15%
482
66%
482
27%
989
August1st to 10thNight
64%
537
16%
1600
11%
534
66%
534
27%
1040
August11th to 20thNight
57%
667
15%
1731
10%
667
59%
667
28%
1189
August21st to endNight
59%
792
16%
1980
9%
792
60%
792
32%
1323
September1st to 10thNight
54%
720
22%
1800
11%
720
59%
720
31%
1210
September11th to 20thNight
61%
720
30%
1800
21%
720
64%
720
39%
1115
September21st to endNight
45%
720
22%
2018
17%
720
51%
720
27%
1346
October1st to 10thNight
42%
720
16%
2160
13%
720
48%
720
24%
1427
October11th to 20thNight
41%
720
24%
2160
16%
720
53%
720
31%
1293
October21st to endNight
33%
792
25%
2388
14%
792
48%
792
27%
1487
November1st to 10thNight
37%
740
25%
2407
14%
740
52%
740
30%
1369
November11th to 20thNight
30%
760
25%
2470
14%
760
45%
760
24%
1503
November21st to endNight
32%
760
23%
2607
12%
760
48%
760
23%
1531
December1st to 10thNight
24%
760
19%
2660
6%
760
40%
760
18%
1714
December11th to 20thNight
22%
760
20%
3183
7%
759
39%
759
17%
1888
December21st to endNight
27%
827
14%
4803
10%
817
43%
817
11%
2968

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
14%5%25%5%35%5%6%8%43%
74726
Night
15%6%25%5%3445%7%43%
75032
TransparencyDay
39%7%13%23%16%3
74431
Night
39%7%12%22%17%3
74846
SeeingDay
17%12%26%25%14%5%
13869
Night
18%10%30%29%12%1
23343

By Month

Percentage Cloud Cover SE (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
13%7%35%6%2445%7%44%
1517
11th to 20thDay
15%7%345%345%5%6%42%
1568
21st to endDay
15%7%346%45%5%5%6%41%
1782
February1st to 10thDay
16%7%25%5%346%5%6%39%
1620
11th to 20thDay
17%6%34435%46%6%41%
1683
21st to endDay
18%9%45%4245%5%5%39%
1480
March1st to 10thDay
12%5%25%42435%7%49%
1845
11th to 20thDay
16%6%35%5%3445%7%43%
1980
21st to endDay
19%6%36%5%35%446%40%
2273
April1st to 10thDay
15%6%25%5%35%45%7%43%
2160
11th to 20thDay
13%5%345%35%45%8%45%
2134
21st to endDay
17%5%35%425%5%6%8%41%
2160
May1st to 10thDay
16%6%35%5%35%5%6%7%39%
2270
11th to 20thDay
17%5%26%436%6%5%8%38%
2478
21st to endDay
13%5%245%35%5%6%9%42%
2725
June1st to 10thDay
11%4245%46%6%7%10%40%
2520
11th to 20thDay
13%5%25%5%36%6%6%10%40%
2520
21st to endDay
10%324435%5%7%11%46%
2520
July1st to 10thDay
8%425%6%36%6%7%8%44%
2520
11th to 20thDay
6%3145%35%7%8%11%47%
2520
21st to endDay
8%435%6%46%6%8%11%38%
2623
August1st to 10thDay
8%6%26%6%35%6%7%10%41%
2327
11th to 20thDay
10%5%25%5%45%6%7%10%42%
2150
21st to endDay
10%5%25%5%446%7%9%42%
2376
September1st to 10thDay
13%6%35%5%345%5%7%44%
2160
11th to 20thDay
12%4145%3445%8%50%
2158
21st to endDay
18%6%35%5%3446%7%40%
1939
October1st to 10thDay
16%7%344335%46%46%
1800
11th to 20thDay
15%5%2433445%6%48%
1800
21st to endDay
17%6%245%24445%47%
1967
November1st to 10thDay
13%6%24333447%52%
1671
11th to 20thDay
14%5%244345%5%6%48%
1710
21st to endDay
15%5%25%5%25%35%6%47%
1568
December1st to 10thDay
17%6%25%4445%5%6%42%
1520
11th to 20thDay
18%7%34335%45%7%42%
1910
21st to endDay
14%6%36%6%45%5%5%8%38%
2772
January1st to 10thNight
17%6%24434346%46%
2649
11th to 20thNight
19%6%35%4345%6%6%40%
2466
21st to endNight
15%6%345%3445%6%46%
2574
February1st to 10thNight
17%7%36%435%46%7%39%
2340
11th to 20thNight
18%7%35%5%34445%43%
2161
21st to endNight
18%7%345%34445%43%
1776
March1st to 10thNight
14%43442445%7%48%
2111
11th to 20thNight
16%6%25%5%2345%7%43%
1980
21st to endNight
17%6%36%6%34446%42%
2082
April1st to 10thNight
16%7%26%5%245%5%6%43%
1800
11th to 20thNight
15%5%345%345%47%45%
1775
21st to endNight
20%5%25%43336%6%44%
1800
May1st to 10thNight
15%6%37%5%35%45%8%37%
1702
11th to 20thNight
18%7%25%335%5%6%7%37%
1415
21st to endNight
14%7%346%35%5%5%9%40%
1550
June1st to 10thNight
12%5%36%425%5%5%8%45%
1440
11th to 20thNight
11%6%36%6%36%5%7%8%40%
1440
21st to endNight
9%5%25%436%6%7%11%42%
1440
July1st to 10thNight
9%5%26%7%36%6%7%9%39%
1440
11th to 20thNight
6%425%6%45%6%9%12%42%
1440
21st to endNight
8%426%6%45%5%7%11%41%
1690
August1st to 10thNight
8%415%5%37%6%9%10%41%
1611
11th to 20thNight
10%6%28%6%46%5%6%8%39%
1731
21st to endNight
11%5%25%6%35%5%6%8%43%
1980
September1st to 10thNight
14%6%35%4345%5%8%45%
1800
11th to 20thNight
12%6%23423448%53%
1800
21st to endNight
17%6%35%6%3445%7%41%
2018
October1st to 10thNight
19%6%35%6%3345%5%42%
2160
11th to 20thNight
16%5%34433447%49%
2160
21st to endNight
17%5%24434446%48%
2388
November1st to 10thNight
12%5%25%323447%53%
2407
11th to 20thNight
16%5%245%23445%49%
2470
21st to endNight
13%5%245%345%5%7%47%
2607
December1st to 10thNight
19%7%35%5%3445%6%40%
2660
11th to 20thNight
17%5%25%5%3445%7%42%
3285
21st to endNight
16%7%35%5%45%5%6%8%36%
4884

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
40%6%13%21%16%5%
1518
11th to 20thDay
43%5%13%22%14%3
1568
21st to endDay
43%5%11%23%15%4
1782
February1st to 10thDay
43%7%13%24%11%2
1620
11th to 20thDay
42%5%10%26%14%3
1692
21st to endDay
46%5%10%21%14%5%
1480
March1st to 10thDay
37%412%27%17%2
1845
11th to 20thDay
41%7%11%20%17%5%
1980
21st to endDay
46%5%8%20%17%4
2273
April1st to 10thDay
39%7%12%20%17%6%
2160
11th to 20thDay
37%6%11%22%18%5%
2134
21st to endDay
40%7%12%18%18%5%
2160
May1st to 10thDay
43%7%11%19%16%3
2270
11th to 20thDay
43%8%13%20%13%2
2482
21st to endDay
37%10%14%24%13%2
2725
June1st to 10thDay
36%10%13%24%15%1
2520
11th to 20thDay
39%8%16%22%13%2
2520
21st to endDay
32%9%16%23%18%1
2520
July1st to 10thDay
36%9%15%21%16%3
2450
11th to 20thDay
29%9%16%27%15%3
2445
21st to endDay
37%11%13%22%15%2
2476
August1st to 10thDay
36%10%17%24%13%1
2314
11th to 20thDay
35%11%15%21%15%2
2150
21st to endDay
36%9%14%22%15%4
2376
September1st to 10thDay
39%7%11%20%18%3
2160
11th to 20thDay
33%6%11%24%23%4
2158
21st to endDay
44%6%8%19%20%3
1939
October1st to 10thDay
40%6%12%22%18%2
1800
11th to 20thDay
36%6%11%22%23%3
1800
21st to endDay
40%5%8%26%18%2
1967
November1st to 10thDay
34%413%27%19%4
1671
11th to 20thDay
35%6%11%23%22%3
1710
21st to endDay
38%5%11%31%13%3
1568
December1st to 10thDay
41%7%14%24%13%1
1520
11th to 20thDay
41%5%11%30%10%2
1906
21st to endDay
42%8%16%21%12%
2772
January1st to 10thNight
41%410%22%18%4
2649
11th to 20thNight
44%6%13%22%13%2
2466
21st to endNight
39%5%10%26%18%3
2574
February1st to 10thNight
44%5%13%23%13%2
2340
11th to 20thNight
44%49%21%18%4
2163
21st to endNight
44%6%9%19%17%6%
1776
March1st to 10thNight
36%413%25%19%3
2111
11th to 20thNight
41%6%11%21%17%4
1980
21st to endNight
44%5%10%18%18%6%
2082
April1st to 10thNight
42%5%11%19%19%5%
1800
11th to 20thNight
38%6%12%20%18%5%
1775
21st to endNight
40%7%10%19%18%6%
1800
May1st to 10thNight
45%7%11%16%17%3
1702
11th to 20thNight
44%9%12%15%18%3
1416
21st to endNight
42%9%15%18%13%2
1551
June1st to 10thNight
37%8%12%23%18%1
1440
11th to 20thNight
39%9%14%22%14%2
1440
21st to endNight
33%11%14%24%16%2
1440
July1st to 10thNight
40%10%16%18%13%3
1400
11th to 20thNight
31%12%17%23%13%3
1392
21st to endNight
35%10%16%22%15%2
1596
August1st to 10thNight
34%13%15%22%15%1
1600
11th to 20thNight
40%9%15%18%15%2
1731
21st to endNight
36%10%15%20%17%3
1980
September1st to 10thNight
39%7%10%21%19%4
1800
11th to 20thNight
31%6%9%24%25%4
1800
21st to endNight
41%6%9%20%19%3
2018
October1st to 10thNight
43%7%10%21%17%2
2160
11th to 20thNight
35%5%12%28%18%3
2160
21st to endNight
37%6%9%27%19%3
2388
November1st to 10thNight
33%6%11%26%19%6%
2407
11th to 20thNight
38%5%10%22%20%5%
2470
21st to endNight
36%5%12%27%18%2
2607
December1st to 10thNight
45%6%11%23%14%1
2660
11th to 20thNight
40%6%12%22%17%4
3288
21st to endNight
42%11%13%24%10%1
4884

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%25%36%17%41
180
11th to 20thDay
19%33%28%18%1
212
21st to endDay
20%25%36%14%5%1
264
February1st to 10thDay
22%25%35%14%4
240
11th to 20thDay
25%22%39%13%1
351
21st to endDay
23%25%31%18%3
346
March1st to 10thDay
14%26%35%20%5%
420
11th to 20thDay
21%21%32%18%5%2
420
21st to endDay
22%17%35%19%6%1
462
April1st to 10thDay
19%20%37%16%6%2
420
11th to 20thDay
17%18%29%24%9%4
412
21st to endDay
23%16%35%20%6%1
420
May1st to 10thDay
26%15%28%21%9%1
423
11th to 20thDay
19%10%30%28%11%2
447
21st to endDay
19%422%27%21%7%
485
June1st to 10thDay
12%6%27%30%18%6%
450
11th to 20thDay
16%7%22%31%19%5%
450
21st to endDay
11%6%24%35%18%7%
450
July1st to 10thDay
12%416%31%27%11%
445
11th to 20thDay
6%215%36%31%10%
444
21st to endDay
10%218%35%27%7%
488
August1st to 10thDay
10%417%32%28%10%
446
11th to 20thDay
11%313%32%29%11%
439
21st to endDay
11%320%31%23%13%
495
September1st to 10thDay
17%7%17%23%24%12%
450
11th to 20thDay
15%321%28%20%13%
450
21st to endDay
22%9%22%28%16%4
450
October1st to 10thDay
22%5%23%26%15%8%
450
11th to 20thDay
15%13%25%27%17%3
450
21st to endDay
20%12%31%25%10%3
489
November1st to 10thDay
15%11%32%25%15%3
365
11th to 20thDay
14%19%35%22%10%
370
21st to endDay
16%20%28%27%9%
228
December1st to 10thDay
20%20%32%21%7%1
180
11th to 20thDay
26%22%28%20%4
180
21st to endDay
23%19%27%23%7%1
198
January1st to 10thNight
20%17%40%20%3
760
11th to 20thNight
23%15%32%25%4
736
21st to endNight
18%16%40%23%2
792
February1st to 10thNight
21%15%39%23%2
720
11th to 20thNight
23%20%38%17%1
703
21st to endNight
23%18%38%19%2
592
March1st to 10thNight
17%18%38%24%4
720
11th to 20thNight
20%15%37%21%6%1
720
21st to endNight
20%9%41%23%6%
792
April1st to 10thNight
20%15%37%22%6%
720
11th to 20thNight
15%13%33%32%7%
711
21st to endNight
23%9%32%29%8%
720
May1st to 10thNight
21%7%34%31%6%
622
11th to 20thNight
19%9%31%31%10%
354
21st to endNight
18%419%38%20%2
389
June1st to 10thNight
14%424%39%19%1
360
11th to 20thNight
12%125%46%15%
360
21st to endNight
8%323%48%18%1
360
July1st to 10thNight
12%417%43%22%2
350
11th to 20thNight
7%114%45%32%1
348
21st to endNight
9%317%42%27%3
510
August1st to 10thNight
9%216%41%29%2
537
11th to 20thNight
13%216%37%30%3
667
21st to endNight
14%317%37%26%4
792
September1st to 10thNight
16%317%37%23%4
720
11th to 20thNight
14%315%37%27%4
720
21st to endNight
21%421%34%19%1
720
October1st to 10thNight
23%6%22%27%18%5%
720
11th to 20thNight
18%8%28%33%13%1
720
21st to endNight
19%10%34%27%9%1
792
November1st to 10thNight
14%9%35%29%12%1
740
11th to 20thNight
20%13%32%27%8%1
760
21st to endNight
14%16%33%28%8%1
760
December1st to 10thNight
22%16%33%21%8%1
760
11th to 20thNight
18%14%39%24%5%
760
21st to endNight
20%12%35%30%3
836
Page generated at 2024-01-11 13:32:01. Version ac07

Copyright 2024 Attilla Danko


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