Long Point Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Long Point Provincial Park clear sky chart from 2005-11-06 to 2024-01-31.

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
37%
23108
8%
75129
7%
23056
39%
23056
9%
61751

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%
757
3%
2564
1%
757
14%
757
3%
2347
January11th to 20thNight
16%
760
2%
2470
1%
760
17%
760
3%
2258
January21st to endNight
19%
835
4%
2711
1%
835
21%
835
4%
2425
February1st to 10thNight
19%
720
4%
2340
1%
720
21%
720
5%
2051
February11th to 20thNight
23%
702
5%
2275
2%
700
27%
700
6%
1964
February21st to endNight
22%
592
6%
1815
2%
592
26%
592
7%
1553
March1st to 10thNight
31%
720
10%
1991
6%
720
35%
720
11%
1623
March11th to 20thNight
32%
720
12%
1980
7%
720
35%
720
12%
1609
March21st to endNight
36%
792
11%
2178
7%
792
39%
792
11%
1798
April1st to 10thNight
34%
720
9%
1882
5%
720
36%
720
14%
1529
April11th to 20thNight
39%
625
13%
1689
7%
625
42%
625
14%
1336
April21st to endNight
46%
540
11%
1620
6%
540
48%
540
12%
1294
May1st to 10thNight
45%
540
10%
1620
7%
540
47%
540
13%
1269
May11th to 20thNight
49%
488
14%
1550
11%
488
53%
488
14%
1173
May21st to endNight
62%
388
14%
1551
18%
388
64%
388
15%
1077
June1st to 10thNight
55%
360
10%
1440
14%
360
59%
360
12%
1054
June11th to 20thNight
56%
360
11%
1440
15%
360
60%
360
12%
1033
June21st to endNight
60%
360
12%
1440
15%
360
65%
360
12%
1049
July1st to 10thNight
70%
350
11%
1400
18%
350
71%
350
14%
987
July11th to 20thNight
64%
468
12%
1512
14%
468
66%
468
16%
1108
July21st to endNight
65%
591
11%
1672
10%
558
66%
558
17%
1234
August1st to 10thNight
70%
537
10%
1600
10%
534
70%
534
16%
1214
August11th to 20thNight
64%
534
15%
1598
11%
534
66%
534
19%
1148
August21st to endNight
63%
648
13%
1836
9%
648
64%
648
19%
1361
September1st to 10thNight
56%
720
12%
1800
6%
720
58%
720
17%
1416
September11th to 20thNight
62%
720
17%
1975
12%
720
65%
720
19%
1458
September21st to endNight
50%
720
10%
1980
8%
720
52%
720
12%
1611
October1st to 10thNight
46%
720
11%
2154
11%
720
48%
720
12%
1684
October11th to 20thNight
32%
720
6%
2160
5%
720
35%
720
9%
1796
October21st to endNight
24%
792
8%
2376
6%
792
27%
792
8%
1996
November1st to 10thNight
36%
740
11%
2380
9%
740
39%
740
11%
1854
November11th to 20thNight
22%
760
9%
2660
7%
760
27%
760
6%
2257
November21st to endNight
20%
760
6%
2660
5%
760
21%
760
5%
2329
December1st to 10thNight
15%
760
1%
2660
1%
760
16%
760
2%
2446
December11th to 20thNight
13%
760
2%
3270
1%
758
15%
758
3%
2920
December21st to endNight
13%
829
1%
4880
0%
817
15%
817
1%
4490

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
15%9%47%6%45%5%6%7%33%
74784
Night
17%10%47%6%35%5%5%7%31%
75336
TransparencyDay
32%39%10%13%6%1
74504
Night
36%38%8%11%6%1
75151
SeeingDay
18%7%22%29%19%5%
13422
Night
21%9%25%27%15%3
23120

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
18%15%6%11%9%5%6%45%417%
1597
11th to 20thDay
18%16%6%13%8%46%5%5%6%14%
1710
21st to endDay
17%14%8%13%9%47%5%4416%
1872
February1st to 10thDay
18%14%6%12%7%5%6%5%5%6%17%
1620
11th to 20thDay
16%11%7%10%8%5%7%5%5%5%23%
1573
21st to endDay
20%11%48%7%35%5%5%6%24%
1440
March1st to 10thDay
16%10%48%8%45%5%5%7%29%
1965
11th to 20thDay
14%11%5%7%7%445%5%7%31%
1980
21st to endDay
20%9%47%7%45%5%45%30%
2178
April1st to 10thDay
16%9%47%6%36%5%5%6%33%
2077
11th to 20thDay
17%9%37%44445%7%35%
2235
21st to endDay
18%8%35%5%345%6%7%36%
2340
May1st to 10thDay
17%7%25%5%45%46%7%37%
2340
11th to 20thDay
15%7%26%5%35%5%6%8%38%
2340
21st to endDay
10%425%5%45%46%10%45%
2725
June1st to 10thDay
11%5%35%5%45%5%6%8%42%
2520
11th to 20thDay
10%6%36%5%35%6%6%9%42%
2520
21st to endDay
9%5%245%345%6%11%46%
2520
July1st to 10thDay
7%3245%35%5%8%9%49%
2520
11th to 20thDay
10%434435%5%7%11%43%
2394
21st to endDay
8%4245%45%5%8%10%45%
2547
August1st to 10thDay
8%414435%6%7%10%47%
2327
11th to 20thDay
9%425%6%45%7%8%11%42%
2303
21st to endDay
10%6%25%5%345%5%9%45%
2502
September1st to 10thDay
12%5%25%5%35%6%6%7%44%
2160
11th to 20thDay
9%5%245%45%6%6%8%48%
1981
21st to endDay
15%5%36%6%346%5%7%39%
1980
October1st to 10thDay
15%7%36%7%36%5%5%7%36%
1805
11th to 20thDay
21%8%37%8%5%5%6%6%6%26%
1800
21st to endDay
24%10%48%6%4446%7%22%
1980
November1st to 10thDay
14%9%37%6%35%5%6%6%35%
1695
11th to 20thDay
18%10%6%8%8%445%5%6%27%
1520
21st to endDay
22%15%49%7%5%6%36%6%18%
1520
December1st to 10thDay
19%18%5%10%8%6%6%5%46%13%
1520
11th to 20thDay
19%17%7%11%8%6%6%445%13%
1906
21st to endDay
29%19%6%10%6%4443411%
2772
January1st to 10thNight
20%15%8%11%9%45%5%4416%
2564
11th to 20thNight
21%17%6%10%8%45%445%17%
2470
21st to endNight
15%17%7%12%8%46%446%18%
2711
February1st to 10thNight
18%15%5%11%7%36%6%35%20%
2340
11th to 20thNight
18%12%49%8%45%6%5%6%23%
2273
21st to endNight
20%12%5%8%7%45%5%5%6%24%
1815
March1st to 10thNight
15%9%47%6%46%5%6%7%31%
1981
11th to 20thNight
17%8%46%5%36%5%47%34%
1979
21st to endNight
17%11%47%6%4445%6%33%
2178
April1st to 10thNight
18%9%46%6%35%447%33%
1882
11th to 20thNight
18%8%35%6%3446%7%36%
1689
21st to endNight
15%5%36%5%36%5%6%8%36%
1620
May1st to 10thNight
17%8%36%5%35%5%6%8%34%
1620
11th to 20thNight
14%6%36%6%35%45%7%40%
1549
21st to endNight
10%6%26%5%235%6%8%47%
1550
June1st to 10thNight
11%6%445%35%5%6%9%42%
1440
11th to 20thNight
10%5%25%7%35%5%7%9%43%
1440
21st to endNight
10%5%25%435%5%6%9%45%
1440
July1st to 10thNight
6%5%245%345%5%8%53%
1440
11th to 20thNight
10%4246%35%5%6%9%47%
1562
21st to endNight
8%5%25%5%445%7%9%46%
1771
August1st to 10thNight
7%4245%36%5%7%11%46%
1611
11th to 20thNight
9%4345%3447%9%47%
1598
21st to endNight
9%5%245%35%5%6%9%47%
1836
September1st to 10thNight
12%7%36%5%2446%8%44%
1800
11th to 20thNight
12%425%42445%7%51%
1975
21st to endNight
15%6%36%6%345%5%6%40%
1980
October1st to 10thNight
16%7%26%5%35%5%5%7%40%
2154
11th to 20thNight
20%8%37%8%3445%7%30%
2160
21st to endNight
24%8%47%6%3445%7%28%
2376
November1st to 10thNight
17%6%46%6%45%45%7%37%
2380
11th to 20thNight
18%12%47%7%46%5%48%25%
2660
21st to endNight
21%15%48%7%46%45%7%20%
2660
December1st to 10thNight
23%17%6%9%7%45%5%46%14%
2660
11th to 20thNight
18%19%7%10%7%45%5%46%15%
3288
21st to endNight
27%19%7%10%7%3444411%
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
44%42%8%5%1
1598
11th to 20thDay
47%42%6%4
1710
21st to endDay
49%37%7%42
1872
February1st to 10thDay
44%38%10%7%2
1620
11th to 20thDay
41%40%8%8%3
1582
21st to endDay
44%37%8%10%2
1440
March1st to 10thDay
34%40%11%13%3
1968
11th to 20thDay
35%39%8%11%6%2
1980
21st to endDay
36%38%6%14%5%1
2178
April1st to 10thDay
28%37%12%12%10%
2077
11th to 20thDay
31%37%9%14%9%1
2235
21st to endDay
31%38%8%14%9%1
2340
May1st to 10thDay
27%39%8%15%9%1
2340
11th to 20thDay
27%38%7%14%11%2
2344
21st to endDay
22%39%11%16%10%2
2725
June1st to 10thDay
25%39%10%17%8%1
2520
11th to 20thDay
23%40%10%17%10%1
2520
21st to endDay
22%39%12%18%9%1
2520
July1st to 10thDay
19%41%9%18%12%1
2450
11th to 20thDay
22%40%12%17%8%1
2322
21st to endDay
20%42%13%16%8%1
2405
August1st to 10thDay
21%38%14%18%8%
2314
11th to 20thDay
21%40%12%17%9%1
2303
21st to endDay
23%38%11%16%10%2
2502
September1st to 10thDay
25%39%11%16%8%1
2160
11th to 20thDay
22%38%13%19%7%
1981
21st to endDay
32%39%10%13%6%1
1980
October1st to 10thDay
30%40%10%12%7%
1805
11th to 20thDay
40%40%9%8%31
1800
21st to endDay
40%39%9%8%31
1980
November1st to 10thDay
27%44%8%14%6%1
1695
11th to 20thDay
34%42%10%8%5%
1520
21st to endDay
42%41%8%8%1
1520
December1st to 10thDay
44%45%6%5%1
1520
11th to 20thDay
50%37%7%42
1906
21st to endDay
61%28%7%4
2772
January1st to 10thNight
46%42%5%5%2
2564
11th to 20thNight
46%42%7%41
2470
21st to endNight
48%37%7%7%1
2711
February1st to 10thNight
44%38%8%7%2
2340
11th to 20thNight
41%39%9%8%3
2275
21st to endNight
41%38%9%9%4
1815
March1st to 10thNight
33%39%10%14%4
1991
11th to 20thNight
33%38%8%13%7%1
1980
21st to endNight
35%38%7%13%7%1
2178
April1st to 10thNight
32%37%7%12%10%1
1882
11th to 20thNight
31%36%7%13%11%1
1689
21st to endNight
31%39%6%12%10%2
1620
May1st to 10thNight
30%38%6%14%9%3
1620
11th to 20thNight
27%37%8%13%11%4
1550
21st to endNight
21%38%9%19%12%2
1551
June1st to 10thNight
24%40%9%16%10%2
1440
11th to 20thNight
24%38%10%14%13%1
1440
21st to endNight
25%39%8%17%11%1
1440
July1st to 10thNight
21%40%6%17%14%3
1400
11th to 20thNight
23%38%8%18%10%2
1512
21st to endNight
20%41%11%15%11%1
1672
August1st to 10thNight
24%40%9%18%9%1
1600
11th to 20thNight
21%37%11%19%10%1
1598
21st to endNight
22%38%10%18%11%2
1836
September1st to 10thNight
26%38%8%15%11%2
1800
11th to 20thNight
22%37%10%21%10%
1975
21st to endNight
32%39%8%14%7%1
1980
October1st to 10thNight
30%38%8%15%8%1
2154
11th to 20thNight
37%38%9%11%5%
2160
21st to endNight
38%38%9%11%41
2376
November1st to 10thNight
26%42%9%15%7%1
2380
11th to 20thNight
36%43%8%8%41
2660
21st to endNight
40%43%8%8%2
2660
December1st to 10thNight
44%44%7%4
2660
11th to 20thNight
49%37%9%5%1
3288
21st to endNight
62%28%7%21
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
26%13%31%19%10%1
218
11th to 20thDay
27%13%33%20%6%1
270
21st to endDay
22%11%34%25%7%
294
February1st to 10thDay
24%14%30%31%1
240
11th to 20thDay
22%12%37%25%4
240
21st to endDay
21%19%34%22%4
198
March1st to 10thDay
19%9%29%34%9%
408
11th to 20thDay
20%8%29%34%7%2
420
21st to endDay
26%8%27%26%12%1
462
April1st to 10thDay
16%7%32%33%10%2
420
11th to 20thDay
19%9%25%28%14%5%
412
21st to endDay
21%6%23%37%12%1
420
May1st to 10thDay
24%420%32%16%4
423
11th to 20thDay
18%221%30%23%6%
447
21st to endDay
13%213%30%32%10%
485
June1st to 10thDay
12%220%38%23%4
450
11th to 20thDay
13%319%32%27%6%
450
21st to endDay
11%414%39%26%5%
450
July1st to 10thDay
7%113%31%35%14%
445
11th to 20thDay
12%411%32%31%9%
444
21st to endDay
8%213%39%34%6%
488
August1st to 10thDay
11%18%33%36%11%
446
11th to 20thDay
11%212%30%37%9%
439
21st to endDay
12%314%30%32%8%
495
September1st to 10thDay
13%217%29%26%13%
450
11th to 20thDay
9%412%27%32%17%
450
21st to endDay
14%7%22%26%23%8%
450
October1st to 10thDay
16%8%19%26%20%10%
450
11th to 20thDay
21%13%27%26%11%2
450
21st to endDay
30%11%25%24%10%
495
November1st to 10thDay
22%12%26%23%14%3
295
11th to 20thDay
27%17%26%20%8%2
180
21st to endDay
30%13%29%24%4
180
December1st to 10thDay
31%18%29%16%6%1
180
11th to 20thDay
29%19%31%18%3
180
21st to endDay
27%18%30%19%6%
198
January1st to 10thNight
29%15%35%15%6%
760
11th to 20thNight
29%14%30%22%4
760
21st to endNight
22%11%35%25%6%
835
February1st to 10thNight
28%10%33%25%4
720
11th to 20thNight
23%10%35%27%5%
703
21st to endNight
25%9%36%26%4
592
March1st to 10thNight
20%7%33%31%9%
720
11th to 20thNight
21%6%33%29%9%1
720
21st to endNight
21%7%28%32%11%2
792
April1st to 10thNight
20%8%29%33%10%1
720
11th to 20thNight
20%7%27%32%12%2
625
21st to endNight
18%423%40%13%1
540
May1st to 10thNight
20%423%29%20%3
540
11th to 20thNight
18%318%35%22%3
488
21st to endNight
14%213%32%30%8%
389
June1st to 10thNight
14%320%36%24%3
360
11th to 20thNight
12%316%38%29%3
360
21st to endNight
12%319%36%28%3
360
July1st to 10thNight
7%310%38%31%11%
350
11th to 20thNight
9%315%34%32%7%
468
21st to endNight
11%213%38%31%5%
591
August1st to 10thNight
8%212%33%37%7%
537
11th to 20thNight
9%214%30%37%8%
534
21st to endNight
11%216%33%29%9%
648
September1st to 10thNight
16%5%14%26%29%9%
720
11th to 20thNight
14%315%29%31%9%
720
21st to endNight
17%6%19%29%22%7%
720
October1st to 10thNight
19%8%21%26%20%6%
720
11th to 20thNight
24%13%25%26%11%2
720
21st to endNight
31%11%29%22%6%1
792
November1st to 10thNight
23%12%25%26%12%2
740
11th to 20thNight
25%16%31%21%6%2
760
21st to endNight
31%16%29%18%6%
760
December1st to 10thNight
34%18%29%14%5%1
760
11th to 20thNight
28%19%33%18%4
760
21st to endNight
31%13%34%19%2
836
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