Munro Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Munro Park clear sky chart from 2005-11-06 to 2024-02-20.

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%
23162
11%
80725
7%
23072
32%
23072
13%
61026

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
13%
942
4%
4737
2%
926
17%
926
4%
4091
January11th to 20thNight
16%
826
7%
4500
4%
812
20%
812
4%
3601
January21st to endNight
24%
832
7%
4522
8%
814
29%
814
6%
3806
February1st to 10thNight
15%
760
8%
2470
4%
760
20%
760
9%
1963
February11th to 20thNight
17%
740
11%
2399
4%
739
25%
739
10%
1853
February21st to endNight
16%
592
10%
1923
4%
592
24%
592
9%
1535
March1st to 10thNight
17%
720
14%
1986
6%
720
25%
720
15%
1494
March11th to 20thNight
20%
720
15%
1980
5%
720
29%
720
15%
1490
March21st to endNight
25%
792
18%
2178
8%
792
33%
792
20%
1546
April1st to 10thNight
20%
720
14%
1816
5%
720
26%
720
17%
1407
April11th to 20thNight
28%
614
17%
1678
7%
614
35%
614
20%
1187
April21st to endNight
28%
540
15%
1620
8%
540
34%
540
16%
1198
May1st to 10thNight
35%
468
17%
1548
12%
468
42%
468
21%
1018
May11th to 20thNight
33%
354
19%
1416
16%
354
47%
354
19%
886
May21st to endNight
34%
388
13%
1551
12%
388
45%
388
20%
928
June1st to 10thNight
33%
360
10%
1348
9%
360
41%
360
17%
912
June11th to 20thNight
41%
360
16%
1260
13%
360
50%
360
23%
769
June21st to endNight
40%
360
11%
1260
9%
360
46%
360
20%
829
July1st to 10thNight
48%
350
17%
1225
17%
350
54%
350
31%
683
July11th to 20thNight
47%
348
16%
1271
17%
348
54%
348
24%
769
July21st to endNight
47%
440
13%
1530
14%
416
51%
416
23%
941
August1st to 10thNight
48%
537
14%
1600
12%
534
50%
534
25%
1046
August11th to 20thNight
52%
534
16%
1598
12%
534
57%
534
26%
1034
August21st to endNight
41%
639
16%
1827
8%
639
45%
639
24%
1226
September1st to 10thNight
45%
720
17%
1800
8%
720
48%
720
33%
1172
September11th to 20thNight
40%
720
17%
1885
11%
720
43%
720
29%
1266
September21st to endNight
40%
720
19%
2024
13%
720
44%
720
24%
1373
October1st to 10thNight
29%
720
16%
2160
12%
720
36%
720
18%
1538
October11th to 20thNight
20%
720
11%
2160
6%
720
26%
720
12%
1694
October21st to endNight
16%
792
10%
2389
5%
792
22%
792
9%
1962
November1st to 10thNight
22%
740
12%
2584
8%
740
29%
740
13%
1904
November11th to 20thNight
16%
760
11%
2660
6%
760
22%
760
9%
2081
November21st to endNight
14%
760
6%
2660
3%
760
18%
760
6%
2263
December1st to 10thNight
11%
760
6%
2660
2%
760
15%
760
4%
2333
December11th to 20thNight
13%
775
8%
3306
4%
774
21%
774
6%
2750
December21st to endNight
13%
1039
4%
5194
2%
1026
16%
1026
3%
4478

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%12%5%8%6%3445%6%29%
78213
Night
16%14%5%9%7%34445%27%
80979
TransparencyDay
56%6%10%18%9%1
77911
Night
60%5%10%16%8%1
80816
SeeingDay
24%16%30%20%8%2
13987
Night
24%14%30%23%9%1
23189

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
13%23%13%15%6%3333415%
2208
11th to 20thDay
11%13%8%18%11%5%445%5%15%
2437
21st to endDay
15%21%10%13%7%4433416%
3124
February1st to 10thDay
11%19%8%13%10%45%44418%
1710
11th to 20thDay
10%17%8%11%9%45%445%23%
1654
21st to endDay
15%18%6%11%9%45%43421%
1332
March1st to 10thDay
15%13%6%11%7%35%445%28%
1970
11th to 20thDay
13%13%5%10%9%5%4445%28%
1980
21st to endDay
18%12%47%5%33346%35%
2178
April1st to 10thDay
22%14%6%7%5%3335%6%27%
2143
11th to 20thDay
20%11%46%43445%6%33%
2248
21st to endDay
22%11%47%5%23336%33%
2340
May1st to 10thDay
21%10%35%5%345%5%7%33%
2412
11th to 20thDay
21%9%36%5%3445%6%34%
2478
21st to endDay
17%7%25%5%3445%8%40%
2725
June1st to 10thDay
21%6%46%6%35%5%5%7%34%
2608
11th to 20thDay
17%5%35%6%45%5%6%7%38%
2700
21st to endDay
20%7%35%6%35%46%7%33%
2700
July1st to 10thDay
14%5%245%35%5%6%8%44%
2700
11th to 20thDay
16%6%26%5%35%6%6%8%38%
2646
21st to endDay
14%6%36%6%45%46%9%37%
2695
August1st to 10thDay
16%6%25%6%35%6%7%8%36%
2327
11th to 20thDay
17%6%35%5%35%5%5%8%37%
2303
21st to endDay
16%7%36%6%4446%9%36%
2510
September1st to 10thDay
16%8%445%3445%7%40%
2160
11th to 20thDay
18%7%345%3446%7%40%
2072
21st to endDay
23%9%37%5%34445%33%
1936
October1st to 10thDay
19%11%36%6%34346%34%
1800
11th to 20thDay
24%16%47%6%3445%6%21%
1800
21st to endDay
30%18%5%5%6%2434419%
1963
November1st to 10thDay
19%16%48%6%33447%24%
1492
11th to 20thDay
17%17%9%11%7%34445%19%
1520
21st to endDay
22%21%8%10%7%4433414%
1520
December1st to 10thDay
17%21%9%13%8%45%43412%
1520
11th to 20thDay
18%18%7%12%8%35%445%18%
1871
21st to endDay
21%20%10%14%7%3333413%
2431
January1st to 10thNight
15%19%10%14%10%45%43413%
4748
11th to 20thNight
11%15%6%15%11%5%6%445%17%
4518
21st to endNight
13%22%11%13%7%45%44316%
4532
February1st to 10thNight
11%16%7%12%9%45%44421%
2470
11th to 20thNight
12%15%7%11%9%445%45%24%
2397
21st to endNight
13%18%7%11%8%46%34421%
1923
March1st to 10thNight
14%14%6%10%6%3435%5%30%
1976
11th to 20thNight
14%14%5%7%6%45%446%30%
1979
21st to endNight
14%12%5%7%6%24345%37%
2178
April1st to 10thNight
21%15%5%7%5%24445%29%
1816
11th to 20thNight
20%11%45%434345%36%
1678
21st to endNight
20%12%47%7%4344431%
1620
May1st to 10thNight
17%9%35%5%2445%7%38%
1548
11th to 20thNight
17%6%15%6%345%5%7%38%
1415
21st to endNight
14%6%27%43445%8%43%
1550
June1st to 10thNight
14%8%46%7%36%6%5%5%36%
1348
11th to 20thNight
17%5%25%434348%45%
1260
21st to endNight
15%7%37%5%445%6%8%36%
1260
July1st to 10thNight
13%5%2432447%9%47%
1260
11th to 20thNight
14%5%36%4445%6%7%44%
1313
21st to endNight
12%5%25%5%35%46%9%43%
1620
August1st to 10thNight
15%6%25%5%345%6%6%42%
1611
11th to 20thNight
13%6%25%5%35%5%6%7%44%
1598
21st to endNight
17%6%35%5%345%5%7%41%
1827
September1st to 10thNight
16%5%24443447%48%
1800
11th to 20thNight
18%7%25%5%24346%44%
1885
21st to endNight
17%8%36%43445%7%40%
2024
October1st to 10thNight
20%10%36%5%34446%35%
2160
11th to 20thNight
25%14%47%6%3445%5%25%
2160
21st to endNight
27%18%37%5%3334422%
2389
November1st to 10thNight
18%15%46%6%34445%29%
2584
11th to 20thNight
18%16%5%11%7%35%445%22%
2660
21st to endNight
22%19%6%10%7%3434417%
2660
December1st to 10thNight
17%23%9%14%8%3433312%
2660
11th to 20thNight
16%19%8%13%8%4444417%
3316
21st to endNight
20%19%8%14%10%3433313%
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
75%39%10%3
2209
11th to 20thDay
70%5%8%10%6%1
2437
21st to endDay
74%46%10%5%1
3124
February1st to 10thDay
71%46%12%6%1
1710
11th to 20thDay
65%410%13%8%1
1663
21st to endDay
69%45%14%8%
1332
March1st to 10thDay
60%410%13%11%1
1973
11th to 20thDay
59%48%18%10%1
1980
21st to endDay
52%48%18%14%4
2178
April1st to 10thDay
59%49%16%10%2
2143
11th to 20thDay
53%5%8%22%12%1
2248
21st to endDay
55%46%17%14%3
2340
May1st to 10thDay
52%5%8%19%14%3
2412
11th to 20thDay
50%6%8%21%13%2
2482
21st to endDay
43%6%12%22%14%3
2725
June1st to 10thDay
50%6%10%21%12%
2608
11th to 20thDay
45%6%10%24%14%1
2700
21st to endDay
50%7%11%20%11%1
2700
July1st to 10thDay
37%8%13%28%14%1
2626
11th to 20thDay
42%7%11%29%10%1
2565
21st to endDay
44%7%11%27%11%
2544
August1st to 10thDay
45%8%11%25%10%1
2314
11th to 20thDay
45%8%14%24%9%1
2303
21st to endDay
47%6%13%24%10%
2510
September1st to 10thDay
45%7%12%25%12%
2160
11th to 20thDay
44%5%13%28%9%
2072
21st to endDay
55%6%10%24%5%
1936
October1st to 10thDay
52%6%12%19%10%1
1800
11th to 20thDay
64%7%12%11%5%1
1800
21st to endDay
71%48%10%6%
1963
November1st to 10thDay
61%6%12%16%5%
1492
11th to 20thDay
68%5%10%10%6%1
1520
21st to endDay
77%5%8%8%2
1520
December1st to 10thDay
77%5%7%8%21
1520
11th to 20thDay
71%6%6%12%5%
1871
21st to endDay
78%4412%2
2431
January1st to 10thNight
76%6%8%7%3
4748
11th to 20thNight
69%7%10%10%4
4518
21st to endNight
74%47%10%5%1
4532
February1st to 10thNight
67%49%13%7%1
2470
11th to 20thNight
63%5%10%16%6%1
2399
21st to endNight
66%5%7%14%7%1
1923
March1st to 10thNight
58%311%14%12%2
1986
11th to 20thNight
57%410%16%11%2
1980
21st to endNight
50%48%20%14%3
2178
April1st to 10thNight
58%47%18%11%2
1816
11th to 20thNight
51%38%22%14%2
1678
21st to endNight
57%46%15%15%3
1620
May1st to 10thNight
46%5%9%22%16%2
1548
11th to 20thNight
44%5%10%21%17%3
1416
21st to endNight
41%5%13%21%16%3
1551
June1st to 10thNight
49%7%9%22%10%3
1348
11th to 20thNight
40%6%10%27%17%1
1260
21st to endNight
45%7%13%22%11%2
1260
July1st to 10thNight
32%6%14%29%17%2
1225
11th to 20thNight
38%7%13%28%13%2
1271
21st to endNight
39%8%15%28%10%1
1530
August1st to 10thNight
41%7%16%24%11%1
1600
11th to 20thNight
37%9%16%26%10%1
1598
21st to endNight
43%7%16%23%10%1
1827
September1st to 10thNight
37%5%15%29%12%1
1800
11th to 20thNight
42%5%15%28%10%
1885
21st to endNight
45%5%14%27%8%
2024
October1st to 10thNight
51%6%12%20%12%
2160
11th to 20thNight
62%5%11%16%5%
2160
21st to endNight
68%5%8%12%7%
2389
November1st to 10thNight
58%6%13%18%5%
2584
11th to 20thNight
64%5%12%12%5%1
2660
21st to endNight
73%6%10%8%3
2660
December1st to 10thNight
79%46%8%3
2660
11th to 20thNight
72%5%6%12%5%
3316
21st to endNight
78%46%9%3
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
24%29%23%14%8%1
180
11th to 20thDay
21%21%34%16%8%
193
21st to endDay
26%16%33%19%5%1
297
February1st to 10thDay
29%26%34%9%2
270
11th to 20thDay
23%30%36%10%1
267
21st to endDay
35%25%33%7%1
198
March1st to 10thDay
25%21%37%15%2
413
11th to 20thDay
19%24%36%15%5%1
420
21st to endDay
29%21%27%17%5%1
462
April1st to 10thDay
28%19%29%17%5%1
420
11th to 20thDay
32%18%23%15%9%3
412
21st to endDay
30%19%29%16%5%2
420
May1st to 10thDay
28%15%28%18%8%2
423
11th to 20thDay
26%16%27%19%10%2
447
21st to endDay
22%15%32%19%11%2
485
June1st to 10thDay
22%13%34%23%7%1
538
11th to 20thDay
19%15%33%23%8%3
630
21st to endDay
22%13%34%19%10%2
630
July1st to 10thDay
13%11%32%33%10%2
621
11th to 20thDay
17%13%26%28%13%2
564
21st to endDay
15%11%30%29%12%3
488
August1st to 10thDay
21%7%27%28%12%5%
446
11th to 20thDay
20%424%28%16%8%
439
21st to endDay
18%13%29%24%11%5%
495
September1st to 10thDay
19%14%28%22%11%5%
450
11th to 20thDay
21%8%29%25%12%5%
450
21st to endDay
26%13%24%22%13%2
450
October1st to 10thDay
25%14%27%21%11%2
450
11th to 20thDay
29%19%34%12%41
450
21st to endDay
39%17%28%14%21
478
November1st to 10thDay
28%22%35%11%31
183
11th to 20thDay
26%24%38%7%31
180
21st to endDay
32%22%37%8%11
180
December1st to 10thDay
28%21%33%16%2
180
11th to 20thDay
30%22%31%14%31
180
21st to endDay
31%22%27%17%31
198
January1st to 10thNight
26%17%32%19%5%1
950
11th to 20thNight
27%17%30%21%5%
832
21st to endNight
21%12%33%24%9%1
836
February1st to 10thNight
21%21%36%18%4
760
11th to 20thNight
20%18%36%20%5%
742
21st to endNight
23%19%35%20%3
592
March1st to 10thNight
21%21%33%21%4
720
11th to 20thNight
24%19%32%18%5%1
720
21st to endNight
20%15%32%25%7%1
792
April1st to 10thNight
30%13%32%20%5%
720
11th to 20thNight
27%17%24%22%8%1
614
21st to endNight
25%14%26%25%9%1
540
May1st to 10thNight
22%8%30%30%10%1
468
11th to 20thNight
21%10%31%27%9%1
354
21st to endNight
17%9%36%30%8%
389
June1st to 10thNight
16%9%33%31%11%
360
11th to 20thNight
18%9%24%36%13%
360
21st to endNight
17%5%30%32%14%1
360
July1st to 10thNight
15%428%40%13%1
350
11th to 20thNight
13%5%27%34%20%1
348
21st to endNight
13%5%28%37%16%
440
August1st to 10thNight
17%324%35%19%1
537
11th to 20thNight
15%5%19%37%21%3
534
21st to endNight
20%8%25%27%17%3
639
September1st to 10thNight
18%6%27%30%17%2
720
11th to 20thNight
21%7%28%24%17%3
720
21st to endNight
21%10%23%28%16%2
720
October1st to 10thNight
25%12%29%24%9%2
720
11th to 20thNight
32%15%27%18%7%1
720
21st to endNight
36%15%28%17%3
792
November1st to 10thNight
29%14%30%19%7%1
740
11th to 20thNight
26%19%31%16%6%
760
21st to endNight
32%16%29%19%3
760
December1st to 10thNight
30%19%30%15%5%
760
11th to 20thNight
26%19%34%16%32
775
21st to endNight
30%17%29%19%4
1045
Page generated at 2024-02-17 06:28:38. Version ac07

Copyright 2024 Attilla Danko


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