Pulpit Rock Astronomical Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pulpit Rock Astronomical Park clear sky chart from 2005-11-06 to 2024-11-05.

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
35%
24077
17%
96847
11%
23826
45%
23826
18%
61217

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%
751
21%
4342
8%
737
37%
737
12%
2511
January11th to 20thNight
25%
759
19%
4251
7%
740
39%
740
10%
2608
January21st to endNight
21%
831
13%
4483
7%
814
39%
814
11%
2960
February1st to 10thNight
25%
760
19%
2470
10%
760
38%
760
18%
1609
February11th to 20thNight
15%
743
18%
2311
3%
740
34%
740
16%
1528
February21st to endNight
19%
628
22%
1884
7%
628
36%
628
18%
1243
March1st to 10thNight
23%
758
19%
3609
9%
744
39%
744
13%
2401
March11th to 20thNight
23%
755
22%
3458
8%
740
36%
740
16%
1818
March21st to endNight
23%
830
14%
3511
7%
814
34%
814
16%
2099
April1st to 10thNight
22%
760
18%
1900
4%
760
31%
760
21%
1323
April11th to 20thNight
28%
751
18%
1875
5%
751
33%
751
26%
1286
April21st to endNight
31%
760
18%
1900
5%
760
37%
760
27%
1286
May1st to 10thNight
33%
571
15%
2766
8%
567
38%
567
12%
1947
May11th to 20thNight
35%
368
11%
2490
12%
364
46%
364
9%
1727
May21st to endNight
46%
405
12%
2722
14%
399
53%
399
12%
1496
June1st to 10thNight
47%
380
19%
1520
19%
380
57%
380
22%
919
June11th to 20thNight
47%
380
15%
1520
14%
380
56%
380
23%
904
June21st to endNight
56%
380
16%
1520
18%
380
61%
380
24%
877
July1st to 10thNight
55%
364
14%
2365
18%
360
60%
360
13%
1409
July11th to 20thNight
58%
363
12%
2239
21%
358
62%
358
15%
1327
July21st to endNight
59%
478
11%
2526
16%
447
63%
447
14%
1622
August1st to 10thNight
62%
558
11%
2720
12%
545
65%
545
16%
1857
August11th to 20thNight
54%
661
15%
2698
11%
654
55%
654
18%
1783
August21st to endNight
56%
819
14%
3108
8%
814
58%
814
23%
1813
September1st to 10thNight
49%
760
24%
1900
11%
760
54%
760
33%
1256
September11th to 20thNight
57%
760
28%
1900
19%
760
60%
760
37%
1197
September21st to endNight
47%
760
23%
2138
16%
760
54%
760
26%
1434
October1st to 10thNight
42%
760
12%
3033
14%
740
49%
740
16%
2158
October11th to 20thNight
43%
760
18%
2532
15%
740
53%
740
23%
1649
October21st to endNight
36%
836
20%
2894
15%
814
48%
814
23%
1755
November1st to 10thNight
38%
760
24%
2470
13%
760
53%
760
28%
1414
November11th to 20thNight
33%
760
24%
2470
15%
760
45%
760
22%
1531
November21st to endNight
32%
760
20%
2660
11%
760
46%
760
21%
1599
December1st to 10thNight
24%
760
17%
2660
8%
760
36%
760
15%
1772
December11th to 20thNight
27%
760
17%
3206
7%
759
41%
759
15%
2047
December21st to endNight
26%
828
11%
4796
8%
817
39%
817
11%
3052

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
17%7%26%5%4446%7%38%
101388
Night
18%7%26%44435%7%40%
97668
TransparencyDay
43%6%12%23%14%2
104950
Night
42%6%12%23%15%2
102182
SeeingDay
21%14%28%23%11%4
14904
Night
20%11%27%30%11%1
24189

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%36%5%4445%5%41%
2517
11th to 20thDay
14%12%5%11%6%6%5%35%7%27%
2623
21st to endDay
21%12%47%5%44345%31%
3124
February1st to 10thDay
16%8%36%6%5%5%5%5%6%35%
1710
11th to 20thDay
14%8%37%5%5%346%7%37%
1755
21st to endDay
20%10%37%5%5%4345%34%
1570
March1st to 10thDay
26%7%26%34335%6%34%
3198
11th to 20thDay
10%6%27%6%5%5%46%7%43%
3480
21st to endDay
21%9%25%333345%43%
3994
April1st to 10thDay
17%8%37%5%4445%6%37%
2280
11th to 20thDay
17%7%27%44445%6%40%
2254
21st to endDay
17%6%25%5%45%46%7%39%
2280
May1st to 10thDay
29%7%26%44445%7%30%
4132
11th to 20thDay
24%10%48%5%5%5%35%6%26%
4398
21st to endDay
14%5%25%44446%9%43%
4837
June1st to 10thDay
13%7%26%5%5%5%47%9%37%
2660
11th to 20thDay
15%6%26%5%46%5%7%9%36%
2660
21st to endDay
12%5%16%45%6%47%10%40%
2660
July1st to 10thDay
7%5%28%6%6%6%5%8%11%36%
4440
11th to 20thDay
10%6%26%5%5%5%47%10%40%
4440
21st to endDay
13%8%38%5%5%5%46%7%34%
4690
August1st to 10thDay
21%5%26%5%45%5%7%8%31%
4104
11th to 20thDay
15%6%26%446%46%8%39%
3821
21st to endDay
15%5%25%33336%8%45%
4180
September1st to 10thDay
18%5%25%34436%5%44%
2280
11th to 20thDay
12%5%2433435%8%50%
2280
21st to endDay
22%7%26%444345%39%
2038
October1st to 10thDay
20%5%25%43345%7%41%
1900
11th to 20thDay
17%5%25%44435%6%44%
1900
21st to endDay
20%7%25%344447%41%
2051
November1st to 10thDay
14%7%24332237%51%
1708
11th to 20thDay
18%6%25%44445%6%43%
1706
21st to endDay
18%6%25%445%348%41%
1520
December1st to 10thDay
21%9%28%44435%6%34%
1520
11th to 20thDay
21%8%26%44445%6%37%
1906
21st to endDay
20%9%49%5%45%45%7%29%
2772
January1st to 10thNight
16%7%27%44445%8%40%
4429
11th to 20thNight
17%8%37%5%5%445%6%35%
4335
21st to endNight
24%9%36%434345%35%
4532
February1st to 10thNight
17%8%36%444447%39%
2470
11th to 20thNight
17%7%37%5%5%445%6%39%
2309
21st to endNight
19%8%25%5%4336%7%39%
1884
March1st to 10thNight
22%11%26%433345%36%
3638
11th to 20thNight
12%7%26%5%4435%6%47%
3479
21st to endNight
17%9%26%433245%45%
3636
April1st to 10thNight
18%7%27%5%4445%6%37%
1900
11th to 20thNight
15%7%36%5%45%45%7%41%
1875
21st to endNight
20%425%34435%6%43%
1900
May1st to 10thNight
28%7%36%44435%6%31%
2838
11th to 20thNight
25%9%37%5%4435%6%29%
2495
21st to endNight
14%6%36%44435%9%40%
2738
June1st to 10thNight
17%6%35%43445%8%42%
1520
11th to 20thNight
13%6%16%445%46%8%42%
1520
21st to endNight
12%5%25%35%5%47%10%43%
1520
July1st to 10thNight
9%6%37%5%6%6%46%9%40%
2520
11th to 20thNight
12%436%5%445%7%10%40%
2520
21st to endNight
15%7%25%5%45%5%6%7%39%
2859
August1st to 10thNight
22%6%26%445%46%7%34%
2825
11th to 20thNight
16%7%27%44435%6%41%
2974
21st to endNight
14%425%33445%8%47%
3476
September1st to 10thNight
16%6%26%433347%48%
1900
11th to 20thNight
12%6%25%343346%51%
1900
21st to endNight
22%5%26%444345%42%
2138
October1st to 10thNight
23%5%14433347%43%
2280
11th to 20thNight
17%6%15%33435%7%47%
2280
21st to endNight
20%5%2433335%6%45%
2546
November1st to 10thNight
13%5%25%43435%6%51%
2470
11th to 20thNight
16%7%36%43335%6%45%
2470
21st to endNight
15%6%26%44446%7%42%
2660
December1st to 10thNight
21%7%26%445%46%6%35%
2660
11th to 20thNight
19%8%36%44445%7%37%
3288
21st to endNight
19%9%37%5%4435%7%34%
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
42%5%15%26%10%2
2518
11th to 20thDay
53%6%13%16%11%2
2623
21st to endDay
54%6%13%19%8%1
3124
February1st to 10thDay
46%6%14%20%12%1
1710
11th to 20thDay
45%5%11%24%13%2
1764
21st to endDay
51%5%11%20%11%3
1570
March1st to 10thDay
49%5%10%26%8%2
3201
11th to 20thDay
36%7%13%28%13%3
3480
21st to endDay
45%410%19%19%3
3994
April1st to 10thDay
45%5%10%21%14%5%
2280
11th to 20thDay
43%6%10%23%15%4
2254
21st to endDay
42%6%11%21%15%5%
2280
May1st to 10thDay
53%6%10%19%10%2
4144
11th to 20thDay
56%6%11%17%8%1
4402
21st to endDay
35%7%14%27%16%2
4837
June1st to 10thDay
40%8%14%23%13%2
2660
11th to 20thDay
42%8%14%23%10%2
2660
21st to endDay
38%7%15%25%14%1
2660
July1st to 10thDay
39%9%14%22%13%2
4370
11th to 20thDay
37%8%16%25%13%1
4365
21st to endDay
47%7%10%18%16%1
4540
August1st to 10thDay
49%7%12%21%10%
4091
11th to 20thDay
40%7%12%29%12%1
3860
21st to endDay
35%5%12%30%17%2
4180
September1st to 10thDay
41%6%10%21%19%3
2280
11th to 20thDay
33%5%11%24%24%3
2280
21st to endDay
47%5%8%18%20%2
2038
October1st to 10thDay
39%49%21%22%5%
3160
11th to 20thDay
29%412%28%23%5%
3140
21st to endDay
27%415%25%26%3
3353
November1st to 10thDay
35%414%25%19%3
1708
11th to 20thDay
39%6%11%24%18%2
1706
21st to endDay
41%5%13%30%9%2
1520
December1st to 10thDay
51%5%15%18%10%1
1520
11th to 20thDay
47%5%15%25%8%1
1906
21st to endDay
52%7%14%20%7%
2772
January1st to 10thNight
41%6%13%26%11%2
4429
11th to 20thNight
46%6%13%23%10%2
4335
21st to endNight
51%410%23%9%1
4532
February1st to 10thNight
44%5%13%26%10%2
2470
11th to 20thNight
45%5%11%20%17%3
2311
21st to endNight
45%5%9%22%16%4
1884
March1st to 10thNight
50%49%24%11%2
3648
11th to 20thNight
35%6%13%29%16%2
3480
21st to endNight
43%48%18%22%5%
3636
April1st to 10thNight
45%5%10%22%14%3
1900
11th to 20thNight
41%6%11%20%20%2
1875
21st to endNight
39%6%12%21%17%5%
1900
May1st to 10thNight
53%6%9%20%10%2
2845
11th to 20thNight
54%8%13%14%10%2
2496
21st to endNight
40%8%13%23%13%3
2739
June1st to 10thNight
39%7%11%23%19%2
1520
11th to 20thNight
37%9%14%26%14%1
1520
21st to endNight
35%8%14%28%13%1
1520
July1st to 10thNight
40%9%15%17%16%3
2480
11th to 20thNight
38%7%16%25%13%1
2472
21st to endNight
42%8%13%18%18%1
2768
August1st to 10thNight
48%8%17%18%10%1
2814
11th to 20thNight
43%5%11%24%15%1
3001
21st to endNight
34%6%11%29%18%1
3476
September1st to 10thNight
38%6%10%23%20%3
1900
11th to 20thNight
34%5%9%24%25%3
1900
21st to endNight
44%5%8%20%21%2
2138
October1st to 10thNight
42%5%9%22%21%2
3800
11th to 20thNight
28%48%30%25%4
3779
21st to endNight
27%412%31%23%2
4182
November1st to 10thNight
34%5%14%25%19%4
2470
11th to 20thNight
41%49%25%17%4
2470
21st to endNight
39%5%13%29%13%2
2660
December1st to 10thNight
48%6%13%20%12%1
2660
11th to 20thNight
45%6%12%22%13%2
3288
21st to endNight
48%6%14%22%9%
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
24%27%27%17%41
180
11th to 20thDay
31%26%30%10%2
211
21st to endDay
24%25%32%14%41
297
February1st to 10thDay
24%26%31%14%4
270
11th to 20thDay
26%22%37%14%1
362
21st to endDay
30%16%29%23%2
382
March1st to 10thDay
25%21%30%20%3
460
11th to 20thDay
22%27%30%15%41
460
21st to endDay
28%21%29%16%5%2
506
April1st to 10thDay
25%20%31%17%5%2
460
11th to 20thDay
22%23%28%16%9%2
452
21st to endDay
27%15%31%18%5%3
460
May1st to 10thDay
30%16%24%19%8%3
463
11th to 20thDay
22%13%32%21%9%2
487
21st to endDay
20%6%27%26%17%5%
529
June1st to 10thDay
14%14%31%23%14%4
490
11th to 20thDay
20%10%30%23%14%3
490
21st to endDay
16%10%31%26%12%5%
490
July1st to 10thDay
14%425%29%20%8%
485
11th to 20thDay
10%5%26%32%22%5%
484
21st to endDay
14%6%29%32%15%4
532
August1st to 10thDay
13%5%23%29%21%9%
486
11th to 20thDay
15%5%20%34%19%7%
479
21st to endDay
15%426%29%16%10%
539
September1st to 10thDay
19%10%19%22%22%8%
490
11th to 20thDay
13%421%31%20%11%
490
21st to endDay
29%10%22%20%16%4
490
October1st to 10thDay
25%7%23%23%15%7%
490
11th to 20thDay
20%12%29%22%14%3
490
21st to endDay
23%13%29%22%12%1
518
November1st to 10thDay
19%13%24%28%12%3
378
11th to 20thDay
21%17%30%25%7%
366
21st to endDay
22%22%33%18%41
180
December1st to 10thDay
29%22%27%13%7%1
180
11th to 20thDay
28%25%27%16%4
180
21st to endDay
28%21%28%18%32
198
January1st to 10thNight
19%16%39%22%3
760
11th to 20thNight
26%15%28%26%4
760
21st to endNight
18%17%36%26%3
836
February1st to 10thNight
23%16%31%29%2
760
11th to 20thNight
22%20%37%19%2
743
21st to endNight
26%16%34%21%3
628
March1st to 10thNight
23%18%31%24%4
760
11th to 20thNight
25%16%31%22%5%1
760
21st to endNight
23%16%34%23%41
836
April1st to 10thNight
23%17%33%22%5%
760
11th to 20thNight
18%14%36%25%8%
751
21st to endNight
24%12%29%27%8%
760
May1st to 10thNight
25%10%26%30%10%
575
11th to 20thNight
20%7%29%32%10%1
374
21st to endNight
18%7%19%39%15%2
411
June1st to 10thNight
17%7%21%36%19%
380
11th to 20thNight
17%325%40%14%1
380
21st to endNight
12%422%45%16%1
380
July1st to 10thNight
12%319%40%23%3
370
11th to 20thNight
11%219%40%26%2
368
21st to endNight
11%416%43%24%1
487
August1st to 10thNight
14%213%40%28%2
567
11th to 20thNight
16%315%35%29%2
675
21st to endNight
17%216%35%27%3
836
September1st to 10thNight
18%420%35%20%3
760
11th to 20thNight
15%5%15%36%25%5%
760
21st to endNight
23%419%33%19%2
760
October1st to 10thNight
24%6%22%27%17%3
760
11th to 20thNight
20%9%23%34%13%1
760
21st to endNight
24%9%27%29%10%
836
November1st to 10thNight
16%10%31%30%13%1
760
11th to 20thNight
20%15%27%29%8%1
760
21st to endNight
18%15%29%32%7%
760
December1st to 10thNight
26%13%32%23%5%1
760
11th to 20thNight
22%12%32%28%5%
760
21st to endNight
25%10%32%30%3
836
Page generated at 2024-11-03 02:11:15. Version ac07

Copyright © 2024 Attilla Danko.


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