Medomak Family Camp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Medomak Family Camp clear sky chart from 2005-11-06 to 2024-01-15.

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
26%
23021
17%
74828
7%
22978
38%
22978
18%
50109

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%
760
18%
2649
5%
757
33%
757
15%
1705
January11th to 20thNight
15%
739
14%
2583
3%
739
29%
739
10%
1845
January21st to endNight
15%
792
19%
2768
5%
792
33%
792
16%
1756
February1st to 10thNight
15%
720
15%
2340
5%
720
29%
720
13%
1633
February11th to 20thNight
14%
702
19%
2140
3%
700
32%
700
16%
1459
February21st to endNight
18%
592
22%
1776
6%
592
38%
592
17%
1195
March1st to 10thNight
14%
720
20%
2160
5%
720
32%
720
17%
1477
March11th to 20thNight
21%
720
16%
1991
5%
720
32%
720
18%
1414
March21st to endNight
21%
792
21%
2165
6%
792
33%
792
20%
1473
April1st to 10thNight
18%
720
17%
1800
3%
720
27%
720
18%
1316
April11th to 20thNight
24%
583
18%
1647
5%
583
33%
583
21%
1124
April21st to endNight
24%
540
14%
1620
5%
540
31%
540
16%
1154
May1st to 10thNight
24%
540
13%
1620
7%
540
29%
540
16%
1170
May11th to 20thNight
23%
532
13%
1594
6%
532
31%
532
17%
1148
May21st to endNight
33%
406
13%
1568
12%
405
41%
405
15%
1077
June1st to 10thNight
32%
360
12%
1281
10%
360
41%
360
14%
910
June11th to 20thNight
41%
360
13%
1260
14%
360
47%
360
21%
818
June21st to endNight
35%
360
9%
1293
9%
360
41%
360
16%
920
July1st to 10thNight
46%
350
10%
1400
14%
350
52%
350
19%
887
July11th to 20thNight
44%
348
12%
1392
15%
348
48%
348
19%
891
July21st to endNight
46%
394
14%
1486
13%
372
53%
372
19%
936
August1st to 10thNight
47%
534
12%
1597
9%
531
50%
531
25%
1037
August11th to 20thNight
42%
532
15%
1596
9%
532
46%
532
22%
1085
August21st to endNight
46%
639
21%
1827
12%
639
50%
639
30%
1159
September1st to 10thNight
42%
720
19%
1868
7%
720
49%
720
33%
1205
September11th to 20thNight
41%
720
22%
1980
12%
720
49%
720
33%
1209
September21st to endNight
37%
720
24%
1980
12%
720
47%
720
29%
1263
October1st to 10thNight
37%
720
19%
2002
10%
720
44%
720
23%
1356
October11th to 20thNight
31%
720
21%
2196
9%
720
44%
720
22%
1429
October21st to endNight
22%
792
15%
2574
6%
792
33%
792
16%
1767
November1st to 10thNight
30%
740
21%
2407
11%
740
43%
740
21%
1529
November11th to 20thNight
25%
760
24%
2470
10%
760
43%
760
19%
1573
November21st to endNight
21%
826
19%
2608
5%
826
37%
826
17%
1698
December1st to 10thNight
16%
850
17%
2783
4%
850
31%
850
15%
1970
December11th to 20thNight
16%
850
17%
3436
3%
849
32%
849
12%
2237
December21st to endNight
13%
868
12%
4971
2%
857
30%
857
8%
3284

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
18%7%35%5%3445%7%38%
74574
Night
18%8%35%5%3445%6%38%
75168
TransparencyDay
45%6%11%21%13%2
74280
Night
46%6%11%21%14%2
74997
SeeingDay
22%18%32%19%7%1
14370
Night
23%14%32%24%7%1
23035

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
15%8%38%5%3435%6%40%
1517
11th to 20thDay
20%8%35%5%2445%7%37%
1472
21st to endDay
14%9%46%6%34447%40%
1588
February1st to 10thDay
19%10%36%5%3445%6%36%
1620
11th to 20thDay
14%9%46%5%35%5%46%37%
1703
21st to endDay
16%9%47%6%26%45%6%34%
1480
March1st to 10thDay
17%9%36%6%35%5%46%37%
1797
11th to 20thDay
17%7%25%6%45%435%42%
1968
21st to endDay
18%9%26%5%3445%5%40%
2187
April1st to 10thDay
21%10%37%6%34445%34%
2160
11th to 20thDay
20%7%35%5%34447%38%
2262
21st to endDay
23%9%35%5%35%45%6%32%
2340
May1st to 10thDay
24%8%35%5%3445%6%33%
2340
11th to 20thDay
21%7%35%6%34446%38%
2301
21st to endDay
19%7%35%5%25%5%6%8%37%
2722
June1st to 10thDay
24%6%36%6%345%5%7%32%
2673
11th to 20thDay
19%6%36%5%34448%38%
2700
21st to endDay
24%7%36%5%446%6%6%30%
2661
July1st to 10thDay
16%7%35%5%345%6%8%38%
2520
11th to 20thDay
14%7%25%5%446%5%9%37%
2520
21st to endDay
15%5%36%5%446%7%9%36%
2727
August1st to 10thDay
14%6%26%6%35%6%6%9%38%
2327
11th to 20thDay
14%6%36%5%45%6%7%8%37%
2304
21st to endDay
14%5%2443446%8%45%
2525
September1st to 10thDay
12%5%25%4345%5%8%48%
2091
11th to 20thDay
13%5%24424336%54%
1980
21st to endDay
19%5%2433345%8%45%
1980
October1st to 10thDay
18%6%25%6%34446%41%
1958
11th to 20thDay
20%6%26%5%34446%41%
1760
21st to endDay
23%8%35%424445%37%
1782
November1st to 10thDay
18%6%25%43345%6%44%
1671
11th to 20thDay
21%5%24424447%43%
1710
21st to endDay
20%9%25%423345%43%
1568
December1st to 10thDay
22%10%35%5%24436%35%
1392
11th to 20thDay
22%9%345%33345%39%
1668
21st to endDay
26%10%35%5%3445%431%
2600
January1st to 10thNight
16%8%35%5%345%5%6%39%
2649
11th to 20thNight
18%11%47%6%345%46%32%
2583
21st to endNight
12%9%36%5%45%45%6%40%
2768
February1st to 10thNight
17%9%46%6%46%5%46%33%
2340
11th to 20thNight
14%9%5%7%5%35%446%38%
2138
21st to endNight
13%10%46%5%34436%40%
1776
March1st to 10thNight
15%11%46%5%25%5%5%6%37%
2150
11th to 20thNight
18%8%37%5%35%5%5%6%35%
1990
21st to endNight
18%9%35%5%33446%41%
2165
April1st to 10thNight
22%9%35%435%5%45%34%
1800
11th to 20thNight
19%7%35%5%345%5%8%37%
1647
21st to endNight
23%9%36%5%25%45%5%33%
1620
May1st to 10thNight
22%8%45%6%35%5%5%7%30%
1620
11th to 20thNight
22%7%37%5%45%5%6%6%31%
1593
21st to endNight
20%8%36%6%35%35%7%34%
1567
June1st to 10thNight
23%8%36%5%35%5%5%8%30%
1281
11th to 20thNight
17%7%25%6%45%35%8%38%
1260
21st to endNight
23%7%45%5%35%46%7%31%
1293
July1st to 10thNight
18%7%34435%5%6%9%36%
1440
11th to 20thNight
15%5%37%5%45%5%5%9%37%
1440
21st to endNight
16%6%35%5%445%6%9%36%
1574
August1st to 10thNight
13%6%26%5%45%5%5%9%41%
1608
11th to 20thNight
14%7%35%6%35%6%6%9%36%
1596
21st to endNight
14%6%2442445%7%48%
1827
September1st to 10thNight
12%425%5%34446%50%
1868
11th to 20thNight
16%7%23223347%52%
1980
21st to endNight
16%6%25%433447%47%
1980
October1st to 10thNight
19%5%25%5%35%45%6%40%
2002
11th to 20thNight
18%5%35%5%3446%7%41%
2196
21st to endNight
24%8%345%34345%37%
2574
November1st to 10thNight
18%5%35%5%2445%6%43%
2407
11th to 20thNight
18%6%245%3445%7%42%
2470
21st to endNight
17%7%26%5%345%5%6%41%
2608
December1st to 10thNight
21%9%35%5%34445%35%
2783
11th to 20thNight
23%8%25%433446%39%
3531
21st to endNight
24%10%36%424446%35%
5044

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
45%5%10%23%15%1
1518
11th to 20thDay
48%7%12%19%12%3
1472
21st to endDay
45%411%22%16%2
1588
February1st to 10thDay
50%5%11%19%14%2
1620
11th to 20thDay
48%6%12%19%13%3
1712
21st to endDay
49%6%9%19%11%5%
1480
March1st to 10thDay
48%5%12%17%14%4
1800
11th to 20thDay
44%5%9%21%17%4
1968
21st to endDay
46%5%9%17%17%6%
2187
April1st to 10thDay
52%5%8%16%15%4
2160
11th to 20thDay
46%6%8%22%16%2
2262
21st to endDay
53%5%8%17%13%4
2340
May1st to 10thDay
52%5%8%20%13%2
2340
11th to 20thDay
48%6%9%21%15%2
2305
21st to endDay
45%9%14%20%11%2
2722
June1st to 10thDay
51%7%12%21%9%1
2673
11th to 20thDay
45%6%11%20%15%2
2700
21st to endDay
52%10%11%17%9%1
2661
July1st to 10thDay
41%8%13%24%13%
2450
11th to 20thDay
42%8%14%24%11%1
2445
21st to endDay
42%9%15%22%11%1
2574
August1st to 10thDay
40%10%16%25%9%
2314
11th to 20thDay
42%9%15%22%12%
2304
21st to endDay
35%8%13%25%18%1
2525
September1st to 10thDay
35%7%14%26%17%1
2091
11th to 20thDay
33%411%28%20%3
1980
21st to endDay
39%6%11%27%17%1
1980
October1st to 10thDay
45%5%11%24%14%2
1958
11th to 20thDay
45%5%13%26%11%1
1760
21st to endDay
50%410%20%14%1
1782
November1st to 10thDay
41%5%13%23%15%2
1671
11th to 20thDay
42%5%11%21%19%3
1710
21st to endDay
44%5%16%22%12%1
1568
December1st to 10thDay
52%5%9%21%12%1
1392
11th to 20thDay
48%5%9%21%14%4
1668
21st to endDay
56%5%10%17%9%2
2600
January1st to 10thNight
44%6%11%24%13%2
2649
11th to 20thNight
53%7%11%17%10%2
2583
21st to endNight
44%5%10%22%17%2
2768
February1st to 10thNight
50%6%11%17%13%2
2340
11th to 20thNight
48%5%9%21%15%3
2140
21st to endNight
46%5%10%20%15%4
1776
March1st to 10thNight
48%49%20%16%3
2160
11th to 20thNight
48%6%11%17%14%4
1991
21st to endNight
45%49%19%19%4
2165
April1st to 10thNight
51%49%17%15%4
1800
11th to 20thNight
46%5%9%23%15%1
1647
21st to endNight
52%5%12%16%12%3
1620
May1st to 10thNight
53%6%9%18%13%1
1620
11th to 20thNight
51%7%10%18%12%3
1594
21st to endNight
50%8%10%19%13%1
1568
June1st to 10thNight
52%8%11%20%8%1
1281
11th to 20thNight
45%6%15%20%12%2
1260
21st to endNight
52%8%11%18%9%2
1293
July1st to 10thNight
42%8%16%21%12%1
1400
11th to 20thNight
44%8%15%23%10%
1392
21st to endNight
43%8%16%24%9%1
1486
August1st to 10thNight
40%8%16%26%9%
1597
11th to 20thNight
44%8%16%19%12%
1596
21st to endNight
36%8%11%26%18%1
1827
September1st to 10thNight
35%7%13%28%16%1
1868
11th to 20thNight
34%5%13%27%20%2
1980
21st to endNight
38%5%10%29%15%2
1980
October1st to 10thNight
44%6%11%24%13%2
2002
11th to 20thNight
42%6%12%27%12%1
2196
21st to endNight
50%5%11%19%14%1
2574
November1st to 10thNight
41%6%12%24%15%1
2407
11th to 20thNight
42%6%10%23%17%2
2470
21st to endNight
43%6%14%20%15%2
2608
December1st to 10thNight
52%5%9%21%12%1
2783
11th to 20thNight
46%6%10%20%17%1
3532
21st to endNight
52%6%11%18%12%1
5044

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
27%23%28%19%3
180
11th to 20thDay
29%27%26%14%22
168
21st to endDay
18%27%34%18%2
180
February1st to 10thDay
27%22%31%16%2
340
11th to 20thDay
26%28%32%12%2
396
21st to endDay
22%24%35%16%3
346
March1st to 10thDay
25%25%35%13%2
420
11th to 20thDay
21%27%33%15%31
420
21st to endDay
26%26%27%13%6%2
462
April1st to 10thDay
30%25%28%11%5%1
420
11th to 20thDay
28%25%27%14%41
412
21st to endDay
28%22%32%13%41
420
May1st to 10thDay
29%22%31%14%31
423
11th to 20thDay
18%22%38%17%41
447
21st to endDay
19%21%36%18%5%1
485
June1st to 10thDay
24%15%32%19%9%1
603
11th to 20thDay
20%16%32%20%11%1
630
21st to endDay
26%10%31%25%8%1
591
July1st to 10thDay
20%8%40%21%9%1
445
11th to 20thDay
16%7%40%23%11%2
444
21st to endDay
14%8%40%25%11%2
488
August1st to 10thDay
14%8%34%30%12%1
446
11th to 20thDay
18%8%31%30%11%3
439
21st to endDay
16%12%32%26%12%3
495
September1st to 10thDay
15%10%33%26%13%2
450
11th to 20thDay
18%13%32%18%13%6%
450
21st to endDay
16%17%30%21%10%4
450
October1st to 10thDay
19%17%26%24%11%3
439
11th to 20thDay
21%19%31%20%7%3
360
21st to endDay
32%13%29%21%5%1
396
November1st to 10thDay
20%21%30%21%7%2
365
11th to 20thDay
26%20%30%19%41
370
21st to endDay
25%24%27%16%6%
370
December1st to 10thDay
25%19%36%14%4
242
11th to 20thDay
33%26%31%9%11
180
21st to endDay
30%28%27%12%4
198
January1st to 10thNight
22%20%36%20%2
760
11th to 20thNight
28%20%32%16%4
739
21st to endNight
19%21%38%19%2
792
February1st to 10thNight
23%20%35%19%3
720
11th to 20thNight
22%22%38%16%3
703
21st to endNight
23%20%34%20%3
592
March1st to 10thNight
23%21%38%17%2
720
11th to 20thNight
22%18%34%20%6%
720
21st to endNight
24%18%33%20%5%1
792
April1st to 10thNight
28%18%33%17%4
720
11th to 20thNight
24%14%34%24%5%
583
21st to endNight
29%13%29%24%4
540
May1st to 10thNight
26%10%31%26%5%1
540
11th to 20thNight
25%10%36%25%4
532
21st to endNight
24%7%30%32%7%1
406
June1st to 10thNight
27%7%26%30%10%
360
11th to 20thNight
18%8%27%34%12%1
360
21st to endNight
25%430%35%6%
360
July1st to 10thNight
22%422%39%11%
350
11th to 20thNight
19%225%40%13%1
348
21st to endNight
18%326%39%13%1
394
August1st to 10thNight
15%5%27%39%13%
534
11th to 20thNight
17%428%36%14%1
532
21st to endNight
16%6%27%36%15%1
639
September1st to 10thNight
13%5%33%35%14%1
720
11th to 20thNight
19%9%27%27%15%4
720
21st to endNight
18%10%31%26%13%2
720
October1st to 10thNight
22%10%26%27%14%1
720
11th to 20thNight
21%11%31%25%10%2
720
21st to endNight
30%14%30%21%5%
792
November1st to 10thNight
24%12%29%26%7%2
740
11th to 20thNight
22%16%33%22%7%1
760
21st to endNight
22%21%31%20%5%
826
December1st to 10thNight
27%16%37%15%5%
850
11th to 20thNight
25%22%32%17%3
850
21st to endNight
27%20%32%18%3
881
Page generated at 2024-01-12 07:31:47. Version ac07

Copyright 2024 Attilla Danko


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