Mt. Kresnak Observing Field
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mt. Kresnak Observing Field clear sky chart from 2005-11-05 to 2017-09-23.

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%
15799
11%
46948
7%
15757
35%
15757
15%
35613

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 15thNight
13%
900
3%
2506
1%
895
14%
895
5%
2274
January16th to endNight
15%
960
5%
2688
2%
960
17%
960
6%
2374
February1st to 15thNight
17%
743
5%
2287
3%
743
20%
743
6%
1980
February16th to endNight
21%
631
8%
1893
4%
631
25%
631
8%
1572
March1st to 15thNight
28%
720
14%
2127
8%
720
33%
720
17%
1557
March16th to endNight
34%
739
18%
2083
11%
739
40%
739
21%
1466
April1st to 15thNight
28%
539
14%
1783
8%
539
35%
539
15%
1294
April16th to endNight
34%
540
18%
1620
9%
540
42%
540
22%
1103
May1st to 15thNight
34%
540
13%
1620
8%
540
39%
540
20%
1148
May16th to endNight
45%
562
14%
1514
7%
561
52%
561
28%
1002
June1st to 15thNight
44%
387
13%
1287
10%
387
49%
387
22%
831
June16th to endNight
50%
395
12%
1295
9%
395
54%
395
26%
812
July1st to 15thNight
61%
510
14%
1360
10%
510
63%
510
37%
834
July16th to endNight
56%
564
14%
1417
10%
531
58%
531
34%
896
August1st to 15thNight
61%
539
17%
1566
14%
536
65%
536
35%
936
August16th to endNight
56%
573
17%
1771
14%
573
59%
573
28%
1105
September1st to 15thNight
54%
612
17%
1872
14%
612
58%
612
30%
1154
September16th to endNight
50%
689
18%
1903
13%
689
53%
689
27%
1281
October1st to 15thNight
38%
660
16%
1870
11%
660
43%
660
21%
1351
October16th to endNight
24%
704
8%
2288
5%
704
28%
704
11%
1823
November1st to 15thNight
25%
700
14%
2276
11%
700
30%
700
13%
1728
November16th to endNight
16%
732
6%
2424
5%
732
19%
732
7%
2062
December1st to 15thNight
9%
900
2%
2700
1%
900
10%
900
3%
2495
December16th to endNight
11%
960
3%
2798
1%
960
13%
960
5%
2535

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
16%10%47%6%3445%6%30%
47951
Night
15%12%5%8%6%34345%28%
47116
Cloud CoverDay
15%10%47%6%3445%6%30%
47960
Night
15%12%5%8%6%34445%28%
47121
TransparencyDay
53%6%11%18%9%
47637
Night
57%5%10%16%8%
46948
SeeingDay
20%8%27%25%13%4
6016
Night
20%9%29%28%10%1
15803

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 15thDay
15%18%10%14%10%6%43339%
1432
16th to endDay
12%17%10%17%10%5%5%3239%
1536
February1st to 15thDay
11%17%8%12%15%34345%13%
1573
16th to endDay
12%18%8%13%8%45%435%14%
1580
March1st to 15thDay
13%8%5%10%9%35%445%27%
1823
16th to endDay
15%11%48%5%3435%6%30%
2151
April1st to 15thDay
20%12%45%324446%31%
2163
16th to endDay
18%10%35%423447%34%
2340
May1st to 15thDay
17%7%36%435%45%6%35%
2331
16th to endDay
13%6%145%2445%8%42%
2599
June1st to 15thDay
14%6%25%425%5%6%9%37%
2670
16th to endDay
15%4245%35%5%6%8%37%
2660
July1st to 15thDay
13%4234245%6%9%43%
2520
16th to endDay
11%424425%5%6%10%42%
2655
August1st to 15thDay
9%425%6%36%6%6%8%40%
2383
16th to endDay
16%5%3442445%7%41%
2429
September1st to 15thDay
16%5%25%42435%7%41%
2075
16th to endDay
16%6%244245%5%8%39%
1894
October1st to 15thDay
23%10%36%5%23346%30%
1759
16th to endDay
26%16%37%6%3345%5%15%
1584
November1st to 15thDay
18%15%5%7%5%3435%5%25%
1582
16th to endDay
18%22%10%10%6%2433413%
1530
December1st to 15thDay
18%18%13%16%9%342228%
1260
16th to endDay
19%22%11%15%8%232238%
1422
January1st to 15thNight
17%16%9%16%11%4423210%
2506
16th to endNight
12%16%8%14%13%5%5%33312%
2688
February1st to 15thNight
10%16%10%13%13%45%33215%
2285
16th to endNight
13%15%7%13%11%4433318%
1893
March1st to 15thNight
12%11%5%8%6%34435%33%
2114
16th to endNight
14%9%46%42445%5%36%
2083
April1st to 15thNight
22%12%36%42345%5%30%
1783
16th to endNight
16%10%35%423335%39%
1620
May1st to 15thNight
14%8%26%6%35%5%5%7%33%
1620
16th to endNight
12%7%16%4245%47%41%
1512
June1st to 15thNight
13%5%25%445%447%41%
1287
16th to endNight
11%6%25%325%37%8%42%
1295
July1st to 15thNight
10%5%145%2445%8%48%
1440
16th to endNight
7%5%25%435%35%7%48%
1513
August1st to 15thNight
7%4235%3346%8%49%
1575
16th to endNight
14%5%15%423347%46%
1771
September1st to 15thNight
14%424314346%48%
1872
16th to endNight
17%6%2342335%7%41%
1903
October1st to 15thNight
22%8%35%5%23345%34%
1870
16th to endNight
26%13%36%5%35%445%20%
2288
November1st to 15thNight
17%16%6%7%434346%25%
2276
16th to endNight
19%22%8%9%6%2433414%
2424
December1st to 15thNight
17%20%13%15%9%233228%
2700
16th to endNight
17%19%11%15%7%343339%
2798

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 15thDay
15%19%9%13%11%5%44339%
1432
16th to endDay
12%17%11%16%11%5%5%33310%
1536
February1st to 15thDay
11%16%9%12%15%3435%412%
1573
16th to endDay
12%18%8%12%9%45%435%15%
1580
March1st to 15thDay
13%9%5%11%9%35%445%27%
1833
16th to endDay
14%11%5%8%6%3435%6%30%
2150
April1st to 15thDay
20%13%35%324345%31%
2163
16th to endDay
18%10%35%423348%34%
2340
May1st to 15thDay
17%8%36%5%25%45%5%34%
2331
16th to endDay
13%7%245%245%5%7%42%
2599
June1st to 15thDay
14%6%25%435%5%6%8%37%
2670
16th to endDay
15%5%145%345%6%8%37%
2660
July1st to 15thDay
14%4134345%6%8%42%
2520
16th to endDay
11%424435%5%6%9%42%
2655
August1st to 15thDay
9%426%6%36%6%6%8%40%
2383
16th to endDay
16%6%2442445%8%39%
2429
September1st to 15thDay
16%6%25%42336%7%40%
2075
16th to endDay
17%7%2442445%8%38%
1894
October1st to 15thDay
23%11%36%5%23346%30%
1759
16th to endDay
26%17%46%6%43445%15%
1584
November1st to 15thDay
17%16%5%7%5%2345%5%25%
1582
16th to endDay
17%22%10%10%6%2324313%
1530
December1st to 15thDay
17%18%12%17%9%343238%
1260
16th to endDay
19%21%11%16%7%231138%
1422
January1st to 15thNight
17%15%9%17%10%4423310%
2506
16th to endNight
12%16%8%14%13%5%5%33313%
2688
February1st to 15thNight
11%15%9%13%13%45%33215%
2278
16th to endNight
13%15%8%13%10%4423318%
1893
March1st to 15thNight
13%10%5%8%6%3443433%
2127
16th to endNight
14%9%47%5%2445%5%36%
2083
April1st to 15thNight
21%11%46%424445%30%
1783
16th to endNight
16%10%35%424336%39%
1620
May1st to 15thNight
14%8%35%6%35%5%5%7%33%
1619
16th to endNight
12%7%25%42445%7%41%
1512
June1st to 15thNight
13%5%26%445%447%40%
1287
16th to endNight
11%6%15%435%47%8%41%
1295
July1st to 15thNight
10%5%145%2435%8%48%
1440
16th to endNight
6%6%35%5%2445%7%48%
1513
August1st to 15thNight
7%42443446%8%50%
1575
16th to endNight
14%5%25%423347%46%
1771
September1st to 15thNight
14%5%24413436%48%
1872
16th to endNight
17%6%235%2435%7%40%
1903
October1st to 15thNight
22%9%245%23345%34%
1870
16th to endNight
25%12%37%5%345%45%21%
2288
November1st to 15thNight
17%15%5%7%5%24346%25%
2276
16th to endNight
19%22%7%9%5%34345%14%
2424
December1st to 15thNight
17%19%12%16%8%332338%
2700
16th to endNight
17%19%11%15%8%343339%
2798

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 15thDay
80%5%6%5%1
1433
16th to endDay
81%46%5%2
1536
February1st to 15thDay
75%6%6%8%1
1575
16th to endDay
71%6%8%10%3
1580
March1st to 15thDay
59%6%10%16%5%
1833
16th to endDay
53%5%13%19%7%1
2151
April1st to 15thDay
53%5%10%19%10%
2163
16th to endDay
49%5%12%15%15%2
2340
May1st to 15thDay
49%5%10%21%10%3
2331
16th to endDay
39%6%13%24%13%1
2603
June1st to 15thDay
41%7%13%24%11%
2670
16th to endDay
41%8%14%21%12%
2660
July1st to 15thDay
35%6%13%26%15%1
2371
16th to endDay
36%7%14%23%15%1
2488
August1st to 15thDay
38%8%16%24%12%
2368
16th to endDay
41%7%12%23%12%1
2429
September1st to 15thDay
41%5%12%26%12%
2075
16th to endDay
42%6%16%24%10%
1894
October1st to 15thDay
55%5%9%22%7%
1759
16th to endDay
70%5%12%8%2
1584
November1st to 15thDay
59%5%11%16%7%
1582
16th to endDay
76%5%9%7%1
1530
December1st to 15thDay
83%36%4
1260
16th to endDay
84%36%41
1422
January1st to 15thNight
80%46%6%1
2506
16th to endNight
77%48%7%2
2688
February1st to 15thNight
75%46%10%2
2287
16th to endNight
70%49%10%4
1893
March1st to 15thNight
53%5%10%19%9%
2127
16th to endNight
47%6%11%21%11%1
2083
April1st to 15thNight
55%47%20%10%1
1783
16th to endNight
47%410%19%15%2
1620
May1st to 15thNight
49%6%10%20%9%3
1620
16th to endNight
40%5%12%25%13%2
1514
June1st to 15thNight
42%6%11%23%15%
1287
16th to endNight
38%7%15%23%14%
1295
July1st to 15thNight
32%5%13%26%19%1
1360
16th to endNight
35%5%15%26%15%1
1417
August1st to 15thNight
31%7%17%30%12%
1566
16th to endNight
37%6%15%24%14%1
1771
September1st to 15thNight
36%6%14%26%14%
1872
16th to endNight
42%6%14%27%8%
1903
October1st to 15thNight
52%410%23%9%
1870
16th to endNight
63%6%12%13%3
2288
November1st to 15thNight
59%5%11%15%7%
2276
16th to endNight
73%5%10%8%1
2424
December1st to 15thNight
83%45%4
2700
16th to endNight
79%5%8%41
2798

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 15thDay
20%13%41%23%2
90
16th to endDay
29%5%32%26%7%
96
February1st to 15thDay
20%20%42%14%3
90
16th to endDay
19%13%38%23%4
81
March1st to 15thDay
23%21%27%17%8%
123
16th to endDay
27%6%26%26%12%1
288
April1st to 15thDay
28%6%30%21%10%2
270
16th to endDay
24%9%32%18%11%2
270
May1st to 15thDay
20%14%26%22%11%4
288
16th to endDay
17%10%32%24%12%3
499
June1st to 15thDay
18%9%29%28%11%2
495
16th to endDay
18%6%30%31%9%3
495
July1st to 15thDay
15%5%25%29%17%6%
475
16th to endDay
11%6%28%30%17%6%
515
August1st to 15thDay
11%121%28%23%12%
356
16th to endDay
23%317%24%20%10%
332
September1st to 15thDay
17%320%24%19%14%
315
16th to endDay
18%6%17%30%21%5%
283
October1st to 15thDay
30%5%28%23%9%2
255
16th to endDay
30%13%35%18%11
96
November1st to 15thDay
23%10%27%27%8%2
90
16th to endDay
20%28%20%23%6%
77
December1st to 15thDay
36%16%35%8%11
60
16th to endDay
29%32%35%11
77
January1st to 15thNight
24%14%33%22%5%
900
16th to endNight
20%13%35%24%5%
960
February1st to 15thNight
17%14%35%27%4
746
16th to endNight
21%12%32%27%5%
631
March1st to 15thNight
17%13%33%24%10%
720
16th to endNight
18%8%30%31%8%1
739
April1st to 15thNight
27%9%28%28%5%
539
16th to endNight
22%8%31%26%10%
540
May1st to 15thNight
17%8%33%30%9%
540
16th to endNight
15%5%29%35%12%1
563
June1st to 15thNight
16%6%25%40%11%
387
16th to endNight
11%327%39%16%1
395
July1st to 15thNight
12%217%42%21%2
510
16th to endNight
9%224%35%25%2
564
August1st to 15thNight
9%117%43%25%2
539
16th to endNight
17%316%38%21%2
573
September1st to 15thNight
17%320%31%21%4
612
16th to endNight
19%420%33%17%3
689
October1st to 15thNight
27%5%24%30%11%1
660
16th to endNight
33%11%27%21%5%
704
November1st to 15thNight
25%11%31%22%7%
700
16th to endNight
29%13%31%21%3
732
December1st to 15thNight
25%15%39%17%2
900
16th to endNight
24%13%36%20%31
960
Page generated at 2017-09-24 09:15:53. Version ac04

Copyright 2017 A. Danko


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