Hall Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hall Beach clear sky chart from 2005-11-06 to 2024-02-05.

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
52%
22331
6%
86319
5%
22283
53%
22283
12%
63805

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
67%
1182
7%
7529
8%
1176
68%
1176
9%
4992
January11th to 20thNight
59%
1129
7%
6857
8%
1114
60%
1114
7%
4891
January21st to endNight
67%
1121
8%
6445
11%
1118
69%
1118
14%
3581
February1st to 10thNight
66%
1003
8%
3145
7%
1003
68%
1003
17%
2297
February11th to 20thNight
75%
877
13%
2692
12%
874
77%
874
22%
1827
February21st to endNight
70%
721
12%
2108
11%
721
71%
721
24%
1437
March1st to 10thNight
61%
720
10%
2339
9%
720
63%
720
17%
1686
March11th to 20thNight
63%
720
11%
2029
8%
720
65%
720
23%
1425
March21st to endNight
63%
716
8%
2022
7%
716
65%
716
20%
1468
April1st to 10thNight
60%
523
1%
1603
0%
523
60%
523
22%
1107
April11th to 20thNight
62%
356
0%
1267
0%
356
62%
356
17%
890
April21st to endNight
47%
360
0%
1048
0%
360
47%
360
13%
827
May1st to 10thNight
43%
334
0%
784
0%
334
43%
334
17%
639
May11th to 20thNight
37%
103
0%
432
0%
103
37%
103
8%
340
May21st to endNight0
0%
5600
0%
43
June1st to 10thNight00000
June11th to 20thNight00000
June21st to endNight00000
July1st to 10thNight00000
July11th to 20thNight0
0%
2200
0%
15
July21st to endNight
46%
108
0%
381
0%
102
46%
102
11%
278
August1st to 10thNight
52%
266
0%
716
0%
265
52%
265
20%
534
August11th to 20thNight
54%
356
0%
972
0%
356
54%
356
22%
702
August21st to endNight
45%
396
0%
1390
0%
396
45%
396
13%
1052
September1st to 10thNight
49%
504
0%
1584
0%
504
49%
504
18%
1136
September11th to 20thNight
42%
657
2%
1771
2%
657
42%
657
12%
1459
September21st to endNight
27%
720
4%
2047
3%
720
28%
720
9%
1737
October1st to 10thNight
26%
720
5%
2261
3%
720
27%
720
7%
1933
October11th to 20thNight
22%
728
3%
2528
3%
728
24%
728
5%
2235
October21st to endNight
35%
1057
5%
3104
4%
1057
38%
1057
8%
2648
November1st to 10thNight
57%
1015
6%
3193
5%
1015
59%
1015
12%
2497
November11th to 20thNight
41%
1040
5%
3592
5%
1040
42%
1040
9%
2943
November21st to endNight
46%
1143
6%
4099
5%
1143
47%
1143
10%
3271
December1st to 10thNight
45%
1220
5%
4560
5%
1220
46%
1220
8%
3734
December11th to 20thNight
53%
1219
9%
5568
8%
1219
55%
1219
11%
3976
December21st to endNight
49%
1317
2%
8175
4%
1303
50%
1303
6%
6205

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
11%10%5%10%8%5%6%6%7%8%25%
76479
Night
5%8%5%11%11%7%9%9%9%10%17%
86809
TransparencyDay
55%7%16%18%4
76001
Night
56%8%14%17%5%
86847
SeeingDay
15%29%23%31%20%
17561
Night
9%211%26%33%19%
22453

By Month

Percentage Cloud Cover NW (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
January11th to 20thDay
6%5%11%9%8%8%14%7%13%20%
233
21st to endDay
217%9%7%9%10%14%23%18%
1097
February1st to 10thDay
2328%13%7%15%14%10%12%15%
910
11th to 20thDay
336%12%6%11%12%13%14%20%
1159
21st to endDay
1328%8%6%9%10%13%17%23%
1146
March1st to 10thDay
16%6%11%9%6%10%9%8%12%22%
1620
11th to 20thDay
2436%9%6%11%9%12%14%23%
1929
21st to endDay
16%49%10%8%10%11%10%10%21%
2353
April1st to 10thDay
310%5%9%8%5%8%9%8%10%25%
2357
11th to 20thDay
36%410%12%8%10%9%7%7%24%
2642
21st to endDay
5%12%6%13%11%6%9%7%5%6%21%
2911
May1st to 10thDay
8%10%6%12%11%6%5%45%6%25%
3177
11th to 20thDay
6%12%8%15%10%5%6%5%6%6%19%
3462
21st to endDay
10%12%8%14%10%5%5%45%6%21%
4459
June1st to 10thDay
12%12%7%10%7%45%6%6%7%25%
4320
11th to 20thDay
14%13%48%5%35%5%5%7%29%
4320
21st to endDay
14%11%48%7%45%5%6%7%30%
4320
July1st to 10thDay
9%7%35%6%35%6%7%9%40%
4320
11th to 20thDay
18%9%48%7%46%5%6%8%25%
4247
21st to endDay
16%9%48%6%445%6%8%30%
3914
August1st to 10thDay
16%8%36%7%45%5%7%7%32%
3219
11th to 20thDay
18%9%46%6%45%5%6%7%31%
2927
21st to endDay
21%12%5%8%6%3446%7%24%
2966
September1st to 10thDay
14%10%48%7%35%45%7%32%
2374
11th to 20thDay
14%17%7%12%7%45%6%5%6%19%
2169
21st to endDay
19%15%7%14%7%3445%5%17%
1913
October1st to 10thDay
14%16%6%15%8%45%5%5%5%16%
1697
11th to 20thDay
15%16%7%15%10%6%5%5%35%11%
1432
21st to endDay
9%16%5%15%11%8%7%5%5%5%14%
1252
November1st to 10thDay
28%5%10%13%9%13%9%8%7%16%
883
11th to 20thDay
9%13%414%16%410%8%6%5%11%
586
21st to endDay
7%16%8%12%5%9%8%5%12%5%13%
165
January1st to 10thNight
1437%10%8%12%15%12%11%17%
7585
11th to 20thNight
16%411%13%8%9%9%9%13%16%
6855
21st to endNight
225%9%9%11%11%17%18%17%
6568
February1st to 10thNight
2328%12%10%12%13%13%13%13%
3145
11th to 20thNight
1228%9%8%11%12%13%13%20%
2688
21st to endNight
1338%9%6%12%10%11%16%21%
2108
March1st to 10thNight
27%410%10%8%11%9%8%9%22%
2339
11th to 20thNight
25%49%9%5%11%9%10%12%25%
2029
21st to endNight
15%49%9%7%9%13%10%10%21%
2022
April1st to 10thNight
311%5%9%7%47%9%8%11%27%
1603
11th to 20thNight
6%7%46%10%7%10%10%7%7%27%
1267
21st to endNight
6%8%6%14%12%8%8%6%46%21%
1048
May1st to 10thNight
9%12%6%14%9%6%6%5%47%23%
784
11th to 20thNight
6%13%9%18%11%6%4346%19%
432
21st to endNight
7%7%13%27%13%24227%18%
56
July11th to 20thNight
9%9%14%18%5%5%5%5%32%
22
21st to endNight
14%10%6%7%7%5%7%6%6%6%25%
403
August1st to 10thNight
16%8%49%7%35%6%46%33%
719
11th to 20thNight
17%8%36%7%45%46%7%34%
972
21st to endNight
22%12%47%5%445%7%7%22%
1390
September1st to 10thNight
13%13%39%6%4345%6%33%
1584
11th to 20thNight
12%17%9%9%6%45%6%6%421%
1771
21st to endNight
20%17%8%14%8%34335%16%
2047
October1st to 10thNight
14%18%7%18%8%45%44315%
2261
11th to 20thNight
14%18%8%17%13%5%5%44310%
2528
21st to endNight
11%14%8%15%11%7%7%5%5%6%11%
3104
November1st to 10thNight
17%5%10%13%9%15%11%7%7%16%
3193
11th to 20thNight
6%14%8%12%13%6%8%9%6%6%11%
3592
21st to endNight
6%12%7%13%12%7%9%5%8%8%13%
4099
December1st to 10thNight
19%7%16%15%9%8%8%9%7%11%
4560
11th to 20thNight
37%5%8%9%7%11%11%13%11%15%
5675
21st to endNight
17%7%16%15%8%9%7%7%10%12%
8360

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
January11th to 20thDay
53%8%25%10%4
236
21st to endDay
38%5%12%30%14%
1097
February1st to 10thDay
50%12%16%19%2
910
11th to 20thDay
42%11%22%17%7%1
1165
21st to endDay
39%7%23%19%13%
1146
March1st to 10thDay
50%7%15%18%10%
1620
11th to 20thDay
44%8%16%21%11%1
1931
21st to endDay
50%8%11%21%9%
2353
April1st to 10thDay
49%7%11%21%11%2
2357
11th to 20thDay
55%6%10%21%8%
2642
21st to endDay
63%48%17%7%
2911
May1st to 10thDay
59%5%9%20%7%
3177
11th to 20thDay
63%6%12%16%4
3466
21st to endDay
64%5%13%15%3
4460
June1st to 10thDay
57%7%15%19%2
4320
11th to 20thDay
53%5%15%24%2
4320
21st to endDay
52%7%20%20%2
4320
July1st to 10thDay
37%9%22%28%4
4201
11th to 20thDay
56%8%18%17%1
4112
21st to endDay
49%8%18%22%2
3696
August1st to 10thDay
48%8%22%19%4
3197
11th to 20thDay
51%8%20%18%3
2927
21st to endDay
59%6%21%13%1
2966
September1st to 10thDay
52%8%25%14%1
2374
11th to 20thDay
65%8%15%11%
2169
21st to endDay
68%7%12%12%1
1913
October1st to 10thDay
68%9%12%10%1
1697
11th to 20thDay
70%11%10%6%3
1432
21st to endDay
67%10%11%10%3
1252
November1st to 10thDay
55%14%16%12%3
883
11th to 20thDay
67%9%9%12%2
586
21st to endDay
64%5%12%17%2
165
January1st to 10thNight
48%11%19%19%3
7585
11th to 20thNight
55%10%19%14%2
6914
21st to endNight
39%7%12%28%14%
6568
February1st to 10thNight
50%11%19%19%2
3145
11th to 20thNight
44%9%20%22%5%
2692
21st to endNight
44%8%16%20%11%1
2108
March1st to 10thNight
53%7%14%18%8%
2339
11th to 20thNight
46%8%16%19%11%1
2029
21st to endNight
47%10%12%19%10%
2022
April1st to 10thNight
47%7%14%23%9%1
1603
11th to 20thNight
52%6%9%24%9%1
1267
21st to endNight
63%5%5%19%6%1
1048
May1st to 10thNight
61%6%7%19%6%
784
11th to 20thNight
66%7%8%18%2
432
21st to endNight
73%49%13%2
56
July11th to 20thNight
64%5%23%9%
22
21st to endNight
52%13%14%20%1
381
August1st to 10thNight
50%10%14%24%3
716
11th to 20thNight
48%8%20%21%3
972
21st to endNight
58%7%22%12%1
1390
September1st to 10thNight
51%7%27%14%1
1584
11th to 20thNight
62%10%14%13%
1771
21st to endNight
72%5%11%11%2
2047
October1st to 10thNight
72%7%9%12%1
2261
11th to 20thNight
77%7%9%6%2
2528
21st to endNight
69%8%10%10%2
3104
November1st to 10thNight
55%13%14%14%3
3193
11th to 20thNight
66%9%11%13%2
3592
21st to endNight
65%6%13%15%1
4099
December1st to 10thNight
65%10%10%12%3
4560
11th to 20thNight
52%10%17%19%2
5675
21st to endNight
64%6%9%15%6%1
8360

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
January11th to 20thDay
10%40%50%
10
21st to endDay
128%31%33%24%
99
February1st to 10thDay
1424%40%32%
159
11th to 20thDay
419%33%44%
160
21st to endDay
1321%42%34%
173
March1st to 10thDay
2310%23%36%26%
240
11th to 20thDay
210%25%33%30%
371
21st to endDay
2211%25%31%30%
462
April1st to 10thDay
9%112%19%32%27%
420
11th to 20thDay
415%19%38%33%
564
21st to endDay
10%413%24%26%23%
736
May1st to 10thDay
11%210%24%28%25%
783
11th to 20thDay
12%312%29%26%18%
827
21st to endDay
14%38%20%32%22%
1208
June1st to 10thDay
16%210%22%32%18%
1170
11th to 20thDay
18%37%26%27%18%
1170
21st to endDay
19%26%26%32%15%
1170
July1st to 10thDay
12%26%21%37%22%
1146
11th to 20thDay
23%36%21%30%17%
1114
21st to endDay
20%27%20%31%20%
980
August1st to 10thDay
20%27%21%34%16%
805
11th to 20thDay
23%39%21%28%16%
753
21st to endDay
27%28%22%25%15%
689
September1st to 10thDay
18%310%20%33%15%
450
11th to 20thDay
23%38%22%25%19%
450
21st to endDay
23%410%28%27%8%
450
October1st to 10thDay
24%5%13%25%25%8%
347
11th to 20thDay
17%412%25%27%14%
180
21st to endDay
13%39%33%27%16%
198
November1st to 10thDay
3111%29%37%19%
180
11th to 20thDay
10%112%25%35%16%
97
January1st to 10thNight
319%24%35%29%
1220
11th to 20thNight
318%31%37%21%
1155
21st to endNight
2110%27%39%21%
1151
February1st to 10thNight
219%24%36%27%
1003
11th to 20thNight
2422%39%33%
879
21st to endNight
119%24%41%24%
721
March1st to 10thNight
438%26%34%25%
720
11th to 20thNight
412%29%41%14%
720
21st to endNight
2312%26%34%23%
716
April1st to 10thNight
8%18%30%36%17%
523
11th to 20thNight
8%18%27%37%20%
356
21st to endNight
10%38%28%31%21%
360
May1st to 10thNight
13%111%26%34%15%
334
11th to 20thNight
14%113%29%25%18%
103
July21st to endNight
18%6%8%26%31%12%
108
August1st to 10thNight
21%28%23%30%17%
266
11th to 20thNight
22%7%26%32%12%
356
21st to endNight
30%26%23%30%8%
396
September1st to 10thNight
19%410%25%32%10%
504
11th to 20thNight
23%39%24%26%15%
657
21st to endNight
26%5%10%25%25%9%
720
October1st to 10thNight
23%416%25%24%9%
720
11th to 20thNight
21%5%15%25%26%8%
728
21st to endNight
15%311%25%32%13%
1057
November1st to 10thNight
4110%30%36%19%
1015
11th to 20thNight
11%216%30%26%14%
1040
21st to endNight
10%311%22%35%20%
1143
December1st to 10thNight
4214%30%30%20%
1220
11th to 20thNight
6%314%26%31%21%
1220
21st to endNight
4112%22%36%25%
1342
Page generated at 2024-02-02 05:20:29. Version ac07

Copyright 2024 Attilla Danko


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