Parry Sound
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Parry Sound 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
29%
23259
12%
80676
8%
23163
35%
23163
14%
59713

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
12%
943
4%
4734
2%
926
17%
926
4%
4069
January11th to 20thNight
14%
831
6%
4398
4%
815
19%
815
4%
3694
January21st to endNight
20%
830
7%
4518
7%
814
26%
814
6%
3696
February1st to 10thNight
17%
760
9%
2470
4%
760
24%
760
9%
1965
February11th to 20thNight
19%
740
12%
2398
5%
738
29%
738
11%
1826
February21st to endNight
19%
592
10%
1880
4%
592
27%
592
11%
1470
March1st to 10thNight
22%
720
16%
2003
7%
720
30%
720
19%
1434
March11th to 20thNight
24%
720
17%
1980
8%
720
33%
720
19%
1420
March21st to endNight
30%
792
18%
2178
9%
792
37%
792
23%
1509
April1st to 10thNight
24%
720
14%
1846
5%
720
29%
720
19%
1380
April11th to 20thNight
30%
592
18%
1656
9%
592
36%
592
21%
1165
April21st to endNight
31%
540
15%
1620
8%
540
37%
540
17%
1168
May1st to 10thNight
40%
527
17%
1607
13%
527
46%
527
24%
1046
May11th to 20thNight
40%
354
21%
1416
21%
354
51%
354
22%
829
May21st to endNight
44%
389
14%
1551
13%
388
55%
388
24%
882
June1st to 10thNight
40%
360
12%
1352
12%
360
47%
360
20%
848
June11th to 20thNight
49%
360
16%
1260
17%
360
57%
360
27%
737
June21st to endNight
48%
360
14%
1260
15%
360
54%
360
25%
771
July1st to 10thNight
61%
350
18%
1225
21%
350
67%
350
35%
646
July11th to 20thNight
52%
348
17%
1269
20%
348
58%
348
28%
716
July21st to endNight
52%
516
15%
1602
14%
488
54%
488
27%
964
August1st to 10thNight
55%
537
16%
1600
13%
534
58%
534
31%
963
August11th to 20thNight
57%
534
17%
1598
11%
534
62%
534
31%
991
August21st to endNight
49%
625
19%
1813
11%
625
54%
625
28%
1179
September1st to 10thNight
49%
720
17%
1800
8%
720
52%
720
34%
1148
September11th to 20thNight
49%
720
21%
1926
13%
720
52%
720
33%
1226
September21st to endNight
44%
720
21%
1999
14%
720
49%
720
26%
1353
October1st to 10thNight
33%
720
15%
2160
11%
720
39%
720
19%
1537
October11th to 20thNight
23%
720
11%
2160
6%
720
30%
720
12%
1688
October21st to endNight
19%
792
11%
2402
6%
792
25%
792
11%
1891
November1st to 10thNight
25%
740
13%
2533
11%
740
30%
740
14%
1835
November11th to 20thNight
20%
760
11%
2660
7%
760
26%
760
11%
2009
November21st to endNight
15%
760
6%
2660
3%
760
19%
760
6%
2169
December1st to 10thNight
12%
760
6%
2660
2%
760
16%
760
6%
2270
December11th to 20thNight
12%
769
8%
3286
3%
768
19%
768
6%
2728
December21st to endNight
12%
1038
4%
5196
1%
1026
16%
1026
4%
4491

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%11%47%6%3445%7%32%
78260
Night
18%13%5%8%6%34446%29%
80928
TransparencyDay
52%6%11%20%10%1
77963
Night
57%5%10%17%9%1
80761
SeeingDay
23%13%31%21%9%2
14012
Night
24%10%28%26%10%1
23285

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
16%23%13%10%5%2332418%
2208
11th to 20thDay
11%17%8%19%10%45%34414%
2555
21st to endDay
17%21%8%11%6%45%33418%
3124
February1st to 10thDay
14%18%8%12%8%34445%21%
1710
11th to 20thDay
12%16%7%10%8%44346%26%
1654
21st to endDay
16%17%6%11%8%3444423%
1372
March1st to 10thDay
14%12%5%8%7%35%5%46%31%
1953
11th to 20thDay
13%12%5%8%7%45%446%32%
1980
21st to endDay
17%9%5%6%5%2445%6%35%
2178
April1st to 10thDay
21%11%5%6%5%35%45%6%29%
2114
11th to 20thDay
20%9%35%5%34436%37%
2267
21st to endDay
21%10%45%5%24445%35%
2340
May1st to 10thDay
20%7%26%435%5%5%8%35%
2353
11th to 20thDay
16%8%36%5%3445%7%40%
2478
21st to endDay
14%5%35%425%45%8%44%
2725
June1st to 10thDay
17%7%35%5%345%5%8%39%
2603
11th to 20thDay
14%5%25%6%35%46%10%41%
2700
21st to endDay
17%7%36%6%346%5%8%36%
2700
July1st to 10thDay
12%424425%5%6%9%47%
2700
11th to 20thDay
11%6%35%5%45%5%5%9%43%
2646
21st to endDay
12%5%26%5%35%5%6%8%42%
2618
August1st to 10thDay
12%6%25%5%4446%8%44%
2327
11th to 20thDay
13%5%25%445%6%6%9%41%
2303
21st to endDay
13%7%26%7%35%5%5%8%38%
2525
September1st to 10thDay
14%6%35%435%5%6%8%42%
2160
11th to 20thDay
15%6%3443445%7%44%
2030
21st to endDay
20%7%36%6%34446%36%
1960
October1st to 10thDay
22%8%26%6%25%5%5%6%33%
1800
11th to 20thDay
28%11%36%5%445%5%5%24%
1800
21st to endDay
31%12%47%5%3444422%
1951
November1st to 10thDay
21%13%48%5%35%5%48%25%
1543
11th to 20thDay
21%14%5%7%6%45%5%5%6%22%
1520
21st to endDay
23%20%47%6%35%445%17%
1520
December1st to 10thDay
18%25%8%8%5%24345%17%
1520
11th to 20thDay
21%22%6%9%5%3432421%
1892
21st to endDay
26%19%7%10%7%3433413%
2431
January1st to 10thNight
17%20%12%12%8%3333414%
4748
11th to 20thNight
15%15%7%17%9%46%5%45%14%
4403
21st to endNight
16%19%9%12%8%3434418%
4532
February1st to 10thNight
14%18%6%10%8%45%5%5%6%20%
2470
11th to 20thNight
13%14%8%11%7%35%45%426%
2397
21st to endNight
16%16%6%10%7%26%44424%
1880
March1st to 10thNight
15%11%5%8%6%34446%35%
1993
11th to 20thNight
14%11%5%8%6%35%45%5%35%
1979
21st to endNight
16%9%46%5%33346%38%
2178
April1st to 10thNight
22%11%46%43445%6%31%
1846
11th to 20thNight
19%9%37%5%3345%6%36%
1656
21st to endNight
21%10%27%5%45%446%31%
1620
May1st to 10thNight
17%7%35%5%345%5%9%37%
1607
11th to 20thNight
15%6%35%6%335%6%8%40%
1415
21st to endNight
10%5%26%435%6%6%8%45%
1550
June1st to 10thNight
15%6%36%5%445%5%8%39%
1352
11th to 20thNight
13%7%23435%46%9%44%
1260
21st to endNight
14%6%35%435%5%6%8%41%
1260
July1st to 10thNight
10%413335%6%6%8%52%
1260
11th to 20thNight
12%6%15%435%5%5%9%45%
1311
21st to endNight
11%5%345%35%5%5%8%46%
1696
August1st to 10thNight
11%6%25%4345%6%8%47%
1611
11th to 20thNight
11%5%25%5%345%5%9%46%
1598
21st to endNight
16%6%25%4245%6%7%42%
1813
September1st to 10thNight
11%425%5%3446%9%47%
1800
11th to 20thNight
13%5%25%4235%5%7%48%
1926
21st to endNight
18%6%36%5%3445%6%40%
1999
October1st to 10thNight
23%8%36%5%3445%5%35%
2160
11th to 20thNight
27%10%47%6%44445%24%
2160
21st to endNight
28%11%48%6%24445%24%
2402
November1st to 10thNight
23%12%37%5%24347%29%
2533
11th to 20thNight
19%15%5%8%6%345%5%6%24%
2660
21st to endNight
24%19%5%7%7%3445%5%17%
2660
December1st to 10thNight
21%23%8%9%6%34345%14%
2660
11th to 20thNight
22%20%7%10%6%3333417%
3297
21st to endNight
24%22%6%11%6%3343413%
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
73%5%9%8%5%
2209
11th to 20thDay
75%48%8%41
2555
21st to endDay
70%7%7%9%6%1
3124
February1st to 10thDay
68%47%16%41
1710
11th to 20thDay
60%5%9%14%9%1
1663
21st to endDay
66%5%7%16%6%
1372
March1st to 10thDay
54%7%13%14%11%1
1956
11th to 20thDay
53%5%9%21%10%2
1980
21st to endDay
49%6%9%18%15%4
2178
April1st to 10thDay
55%6%10%17%10%2
2114
11th to 20thDay
50%5%7%22%15%1
2267
21st to endDay
51%6%9%18%13%3
2340
May1st to 10thDay
47%7%8%22%14%3
2353
11th to 20thDay
44%7%9%24%14%2
2482
21st to endDay
39%6%14%24%14%3
2725
June1st to 10thDay
44%7%9%25%14%1
2603
11th to 20thDay
41%6%10%25%17%1
2700
21st to endDay
45%8%12%22%11%1
2700
July1st to 10thDay
34%8%13%29%15%2
2626
11th to 20thDay
37%8%13%30%12%1
2565
21st to endDay
39%8%12%27%14%1
2472
August1st to 10thDay
38%8%14%26%13%1
2314
11th to 20thDay
38%9%15%28%9%1
2303
21st to endDay
43%8%14%23%11%1
2525
September1st to 10thDay
40%7%12%28%12%1
2160
11th to 20thDay
38%6%14%31%10%
2030
21st to endDay
50%6%11%25%7%
1960
October1st to 10thDay
52%7%11%18%11%1
1800
11th to 20thDay
62%6%12%13%6%1
1800
21st to endDay
67%5%10%12%6%
1951
November1st to 10thDay
57%6%12%19%5%
1543
11th to 20thDay
64%5%13%12%6%1
1520
21st to endDay
70%6%13%9%31
1520
December1st to 10thDay
70%5%11%10%31
1520
11th to 20thDay
70%38%11%6%
1892
21st to endDay
76%5%7%9%2
2431
January1st to 10thNight
76%5%6%8%4
4748
11th to 20thNight
73%6%8%8%4
4403
21st to endNight
71%5%7%11%6%1
4532
February1st to 10thNight
66%5%9%15%5%1
2470
11th to 20thNight
60%6%10%16%7%1
2399
21st to endNight
64%49%15%7%1
1880
March1st to 10thNight
52%413%17%13%1
2003
11th to 20thNight
52%410%20%12%2
1980
21st to endNight
48%49%21%15%3
2178
April1st to 10thNight
54%5%7%21%12%2
1846
11th to 20thNight
50%46%22%16%2
1656
21st to endNight
55%48%15%15%2
1620
May1st to 10thNight
44%5%10%21%16%3
1607
11th to 20thNight
41%5%9%25%19%2
1416
21st to endNight
36%7%15%23%17%3
1551
June1st to 10thNight
44%6%10%24%15%2
1352
11th to 20thNight
36%5%12%28%19%
1260
21st to endNight
39%6%15%26%13%1
1260
July1st to 10thNight
28%6%13%30%21%3
1225
11th to 20thNight
36%414%31%13%2
1269
21st to endNight
37%6%13%29%14%1
1602
August1st to 10thNight
35%6%18%26%14%1
1600
11th to 20thNight
35%7%17%26%13%1
1598
21st to endNight
40%6%13%28%11%1
1813
September1st to 10thNight
35%6%16%27%15%2
1800
11th to 20thNight
35%7%15%32%10%
1926
21st to endNight
44%5%14%28%9%
1999
October1st to 10thNight
51%6%12%20%12%
2160
11th to 20thNight
62%5%11%17%5%
2160
21st to endNight
64%410%14%7%1
2402
November1st to 10thNight
56%5%13%19%6%
2533
11th to 20thNight
61%5%14%13%6%1
2660
21st to endNight
70%5%12%10%3
2660
December1st to 10thNight
74%6%9%9%3
2660
11th to 20thNight
71%6%7%11%5%
3297
21st to endNight
77%5%7%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
25%24%32%11%6%2
180
11th to 20thDay
24%19%36%18%31
227
21st to endDay
32%11%36%14%6%
297
February1st to 10thDay
32%20%36%8%31
270
11th to 20thDay
22%24%42%11%1
267
21st to endDay
37%25%31%7%
198
March1st to 10thDay
27%18%35%17%31
396
11th to 20thDay
24%17%38%15%5%1
420
21st to endDay
28%16%32%18%5%1
462
April1st to 10thDay
26%18%29%19%7%
420
11th to 20thDay
30%17%26%16%8%4
412
21st to endDay
28%16%32%16%6%1
420
May1st to 10thDay
27%10%32%21%8%3
423
11th to 20thDay
23%15%29%21%9%4
447
21st to endDay
18%14%31%22%14%2
485
June1st to 10thDay
21%12%30%27%8%2
533
11th to 20thDay
17%10%34%26%11%2
630
21st to endDay
20%8%36%25%10%1
630
July1st to 10thDay
13%6%34%31%15%2
621
11th to 20thDay
13%8%29%31%14%4
564
21st to endDay
13%6%34%31%11%4
488
August1st to 10thDay
15%9%23%32%14%6%
446
11th to 20thDay
16%424%30%17%9%
439
21st to endDay
18%10%27%24%15%5%
495
September1st to 10thDay
14%10%31%26%14%5%
450
11th to 20thDay
17%6%27%27%18%5%
450
21st to endDay
21%9%24%27%16%2
450
October1st to 10thDay
27%12%25%20%13%2
450
11th to 20thDay
31%14%34%16%32
450
21st to endDay
38%15%30%14%21
466
November1st to 10thDay
35%16%31%14%3
208
11th to 20thDay
24%23%36%15%2
180
21st to endDay
35%18%33%11%21
180
December1st to 10thDay
30%20%32%14%4
180
11th to 20thDay
35%21%29%12%21
180
21st to endDay
36%21%30%9%4
198
January1st to 10thNight
28%15%31%21%31
950
11th to 20thNight
31%14%30%19%5%
835
21st to endNight
22%9%36%23%8%1
836
February1st to 10thNight
24%18%33%22%3
760
11th to 20thNight
21%13%37%22%7%
742
21st to endNight
26%16%31%22%5%
592
March1st to 10thNight
21%15%34%25%5%
720
11th to 20thNight
22%12%36%25%5%1
720
21st to endNight
20%10%33%27%9%1
792
April1st to 10thNight
27%11%30%27%5%
720
11th to 20thNight
23%12%29%24%10%1
592
21st to endNight
26%10%26%26%11%
540
May1st to 10thNight
21%5%25%34%13%2
527
11th to 20thNight
18%6%27%36%12%1
354
21st to endNight
13%5%32%34%15%1
389
June1st to 10thNight
16%430%36%13%1
360
11th to 20thNight
18%7%23%36%15%
360
21st to endNight
15%6%24%35%18%2
360
July1st to 10thNight
11%319%45%21%2
350
11th to 20thNight
13%325%36%22%1
348
21st to endNight
14%422%36%22%1
516
August1st to 10thNight
14%319%34%27%3
537
11th to 20thNight
13%219%35%27%4
534
21st to endNight
19%6%20%31%21%3
625
September1st to 10thNight
14%5%27%31%20%4
720
11th to 20thNight
16%7%23%31%19%5%
720
21st to endNight
21%7%21%30%17%4
720
October1st to 10thNight
26%9%26%26%13%1
720
11th to 20thNight
33%10%26%23%7%1
720
21st to endNight
34%12%29%22%31
792
November1st to 10thNight
33%7%29%21%9%1
740
11th to 20thNight
29%15%29%22%5%
760
21st to endNight
38%11%27%20%4
760
December1st to 10thNight
35%15%30%16%5%
760
11th to 20thNight
32%17%32%15%31
769
21st to endNight
33%14%30%18%3
1045
Page generated at 2024-02-17 06:28:35. Version ac07

Copyright 2024 Attilla Danko


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