Restoule Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Restoule Provincial Park clear sky chart from 2005-11-05 to 2017-09-17.

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
28%
14997
12%
46714
7%
14966
33%
14966
15%
34621

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 15thNight
13%
897
5%
2685
2%
895
16%
895
8%
2263
January16th to endNight
22%
783
10%
2539
6%
783
28%
783
10%
2001
February1st to 15thNight
19%
702
7%
2287
4%
701
23%
701
9%
1828
February16th to endNight
20%
631
9%
2039
5%
631
26%
631
9%
1605
March1st to 15thNight
20%
720
11%
1994
5%
720
25%
720
13%
1543
March16th to endNight
30%
768
18%
2112
10%
768
37%
768
23%
1460
April1st to 15thNight
24%
697
14%
1793
5%
697
29%
697
18%
1348
April16th to endNight
31%
540
17%
1620
9%
540
37%
540
20%
1132
May1st to 15thNight
36%
443
16%
1523
13%
443
44%
443
19%
1006
May16th to endNight
34%
374
13%
1497
8%
374
46%
374
19%
912
June1st to 15thNight
38%
360
10%
1296
9%
360
44%
360
19%
854
June16th to endNight
41%
360
9%
1260
7%
360
47%
360
19%
832
July1st to 15thNight
47%
340
15%
1190
15%
340
52%
340
29%
683
July16th to endNight
47%
421
13%
1416
13%
396
51%
396
23%
887
August1st to 15thNight
47%
539
14%
1609
11%
536
50%
536
25%
1067
August16th to endNight
48%
594
18%
1740
9%
594
54%
594
27%
1131
September1st to 15thNight
41%
720
15%
1810
7%
720
44%
720
30%
1212
September16th to endNight
41%
665
18%
1856
11%
665
45%
665
27%
1236
October1st to 15thNight
29%
660
15%
1980
10%
660
35%
660
16%
1456
October16th to endNight
18%
704
9%
2131
6%
704
24%
704
10%
1735
November1st to 15thNight
23%
700
13%
2438
10%
700
30%
700
13%
1780
November16th to endNight
19%
720
8%
2520
5%
720
23%
720
8%
2060
December1st to 15thNight
13%
720
6%
2520
2%
720
19%
720
6%
2141
December16th to endNight
14%
939
6%
2859
3%
939
17%
939
7%
2449

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%10%46%5%34446%30%
48067
Night
18%12%47%5%34445%29%
46877
Cloud CoverDay
18%10%46%5%34446%30%
48077
Night
18%12%47%6%34445%29%
46882
TransparencyDay
55%410%18%9%
47749
Night
57%410%17%8%
46714
SeeingDay
23%11%29%21%10%3
5791
Night
24%10%29%24%9%1
15003

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 15thDay
18%18%8%9%7%2324420%
1253
16th to endDay
13%16%7%11%7%45%345%20%
1681
February1st to 15thDay
11%17%8%10%9%35%435%21%
1575
16th to endDay
15%16%7%11%7%3433323%
1434
March1st to 15thDay
17%12%48%6%35%5%3428%
1954
16th to endDay
14%8%46%6%2445%5%37%
2112
April1st to 15thDay
22%11%45%423445%31%
2163
16th to endDay
21%9%35%41334439%
2340
May1st to 15thDay
21%8%35%5%33347%31%
2427
16th to endDay
16%6%25%42445%7%38%
2618
June1st to 15thDay
18%6%45%435%5%6%7%31%
2661
16th to endDay
18%5%35%5%36%5%5%7%32%
2700
July1st to 15thDay
14%5%25%5%25%45%7%40%
2700
16th to endDay
14%5%35%5%35%5%6%8%37%
2651
August1st to 15thDay
16%6%26%5%345%5%7%35%
2340
16th to endDay
15%6%25%6%345%5%7%37%
2450
September1st to 15thDay
18%8%35%5%23346%36%
2148
16th to endDay
21%6%34424346%36%
1810
October1st to 15thDay
21%11%36%5%23346%30%
1650
16th to endDay
31%13%37%5%2333420%
1738
November1st to 15thDay
20%15%46%5%23447%24%
1420
16th to endDay
26%17%6%10%6%3323416%
1440
December1st to 15thDay
19%21%8%9%6%45%5%2411%
1440
16th to endDay
20%22%9%11%5%2433313%
1362
January1st to 15thNight
19%16%7%11%7%3433416%
2685
16th to endNight
14%17%7%10%6%35%345%21%
2539
February1st to 15thNight
12%16%7%9%8%45%5%4421%
2285
16th to endNight
14%17%6%10%7%35%44422%
2039
March1st to 15thNight
17%15%5%8%6%34335%27%
1982
16th to endNight
14%9%36%5%23345%39%
2112
April1st to 15thNight
22%13%45%42334431%
1793
16th to endNight
21%8%35%424345%36%
1620
May1st to 15thNight
18%8%145%2445%8%35%
1523
16th to endNight
15%5%35%424449%39%
1495
June1st to 15thNight
15%7%26%5%345%5%7%35%
1296
16th to endNight
15%5%26%5%25%46%8%36%
1260
July1st to 15thNight
12%42442346%8%45%
1260
16th to endNight
12%434425%5%6%8%42%
1514
August1st to 15thNight
13%7%26%4245%5%6%42%
1620
16th to endNight
13%5%25%4245%46%43%
1740
September1st to 15thNight
17%5%23423345%45%
1810
16th to endNight
17%6%25%423446%42%
1856
October1st to 15thNight
22%10%36%5%23445%31%
1980
16th to endNight
28%14%36%5%2443422%
2131
November1st to 15thNight
19%11%47%5%24446%28%
2438
16th to endNight
24%15%6%8%7%2343419%
2520
December1st to 15thNight
21%20%7%9%6%2433315%
2520
16th to endNight
21%19%7%11%7%2432315%
2859

Percentage Cloud Cover SE (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 15thDay
18%17%8%10%7%2334419%
1253
16th to endDay
13%18%6%11%7%35%445%19%
1681
February1st to 15thDay
11%17%8%11%8%35%435%20%
1575
16th to endDay
15%16%6%11%8%4423323%
1434
March1st to 15thDay
16%13%5%7%6%3444428%
1965
16th to endDay
14%8%46%5%2435%5%37%
2111
April1st to 15thDay
23%11%4442345%6%30%
2163
16th to endDay
21%9%35%313335%38%
2340
May1st to 15thDay
21%9%25%5%24346%31%
2427
16th to endDay
17%7%25%434447%38%
2618
June1st to 15thDay
18%7%35%4445%5%7%31%
2661
16th to endDay
18%6%25%5%36%5%6%7%32%
2700
July1st to 15thDay
15%425%5%35%46%6%40%
2700
16th to endDay
14%5%25%5%35%5%6%8%37%
2651
August1st to 15thDay
16%6%25%5%35%45%7%35%
2340
16th to endDay
15%6%26%5%35%45%8%35%
2450
September1st to 15thDay
19%8%25%433347%35%
2148
16th to endDay
22%6%25%5%23435%36%
1810
October1st to 15thDay
22%11%35%5%23346%30%
1650
16th to endDay
32%14%36%5%23335%19%
1738
November1st to 15thDay
20%15%46%42345%6%24%
1420
16th to endDay
26%16%7%9%5%3333416%
1440
December1st to 15thDay
19%21%8%10%7%35%5%2411%
1440
16th to endDay
20%22%9%11%5%2432313%
1362
January1st to 15thNight
19%17%6%12%8%4333416%
2685
16th to endNight
14%16%7%9%7%44445%21%
2539
February1st to 15thNight
13%16%7%10%8%4445%420%
2278
16th to endNight
15%16%6%10%7%45%33422%
2039
March1st to 15thNight
17%14%5%8%5%44335%27%
1994
16th to endNight
14%9%46%5%24335%39%
2112
April1st to 15thNight
21%14%44423335%31%
1793
16th to endNight
21%9%25%5%24245%36%
1620
May1st to 15thNight
18%7%245%3435%8%35%
1523
16th to endNight
15%5%26%42345%8%40%
1495
June1st to 15thNight
15%7%25%6%345%6%7%35%
1296
16th to endNight
14%6%25%6%25%5%7%7%36%
1260
July1st to 15thNight
12%5%1432346%8%46%
1260
16th to endNight
12%435%4345%6%7%42%
1514
August1st to 15thNight
13%6%25%42445%6%41%
1620
16th to endNight
13%5%245%335%5%6%43%
1740
September1st to 15thNight
18%5%24323346%45%
1810
16th to endNight
17%6%25%5%23335%43%
1856
October1st to 15thNight
22%9%36%5%3345%5%31%
1980
16th to endNight
28%14%46%43333421%
2131
November1st to 15thNight
19%12%46%5%33445%28%
2438
16th to endNight
25%14%6%8%6%2343419%
2520
December1st to 15thNight
21%20%8%9%6%3433315%
2520
16th to endNight
21%19%8%11%6%2433315%
2859

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 15thDay
69%39%12%5%
1254
16th to endDay
67%38%14%6%
1681
February1st to 15thDay
67%48%13%4
1577
16th to endDay
67%27%14%8%
1434
March1st to 15thDay
59%411%15%8%
1965
16th to endDay
48%39%19%15%3
2112
April1st to 15thDay
55%39%17%12%1
2163
16th to endDay
49%47%22%14%2
2340
May1st to 15thDay
53%39%18%13%1
2427
16th to endDay
45%5%12%22%12%1
2622
June1st to 15thDay
50%7%10%21%9%
2661
16th to endDay
49%6%12%19%10%1
2700
July1st to 15thDay
41%5%12%26%12%1
2541
16th to endDay
46%6%11%23%11%
2487
August1st to 15thDay
47%6%13%21%9%
2327
16th to endDay
45%6%13%25%7%
2450
September1st to 15thDay
49%413%22%9%
2148
16th to endDay
49%5%12%25%6%
1810
October1st to 15thDay
56%412%17%8%
1650
16th to endDay
68%411%9%5%
1738
November1st to 15thDay
60%5%11%15%6%
1420
16th to endDay
73%38%10%3
1440
December1st to 15thDay
77%48%8%1
1440
16th to endDay
77%36%9%2
1362
January1st to 15thNight
72%39%9%4
2685
16th to endNight
66%38%15%6%
2539
February1st to 15thNight
66%5%10%12%5%
2287
16th to endNight
66%38%15%6%
2039
March1st to 15thNight
61%310%15%7%
1994
16th to endNight
48%310%20%15%2
2112
April1st to 15thNight
56%37%18%12%1
1793
16th to endNight
51%37%18%16%2
1620
May1st to 15thNight
47%49%21%14%1
1523
16th to endNight
42%5%12%23%14%2
1497
June1st to 15thNight
47%5%10%23%11%1
1296
16th to endNight
45%7%11%23%11%1
1260
July1st to 15thNight
34%6%13%29%12%3
1190
16th to endNight
40%7%14%25%11%
1416
August1st to 15thNight
42%6%16%23%10%
1609
16th to endNight
39%7%15%26%10%
1740
September1st to 15thNight
40%5%16%26%9%1
1810
16th to endNight
43%413%30%7%
1856
October1st to 15thNight
54%6%9%19%10%
1980
16th to endNight
67%410%12%4
2131
November1st to 15thNight
56%5%12%18%5%
2438
16th to endNight
68%5%11%10%3
2520
December1st to 15thNight
74%48%10%2
2520
16th to endNight
75%37%8%5%
2859

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 15thDay
26%28%28%11%5%
60
16th to endDay
32%9%30%15%9%1
91
February1st to 15thDay
32%15%42%10%
90
16th to endDay
32%25%28%12%1
81
March1st to 15thDay
24%16%34%16%7%
255
16th to endDay
21%15%32%17%8%3
288
April1st to 15thDay
27%12%29%19%8%1
270
16th to endDay
25%15%27%17%8%5%
270
May1st to 15thDay
31%7%23%19%12%5%
288
16th to endDay
19%13%31%20%12%1
331
June1st to 15thDay
21%14%29%25%7%1
456
16th to endDay
19%9%35%22%10%2
495
July1st to 15thDay
15%8%29%31%11%2
475
16th to endDay
16%7%30%26%12%5%
370
August1st to 15thDay
20%5%22%29%14%7%
313
16th to endDay
19%6%26%23%17%6%
332
September1st to 15thDay
20%6%25%22%16%8%
315
16th to endDay
24%8%24%26%11%5%
259
October1st to 15thDay
26%9%32%21%8%1
255
16th to endDay
36%16%24%17%31
250
November1st to 15thDay
23%19%30%20%6%
63
16th to endDay
33%18%35%11%1
60
December1st to 15thDay
31%18%31%15%3
60
16th to endDay
39%26%31%11
64
January1st to 15thNight
29%14%32%17%4
900
16th to endNight
23%12%30%23%8%1
783
February1st to 15thNight
20%14%34%22%7%
704
16th to endNight
24%13%34%22%5%
631
March1st to 15thNight
26%19%28%20%5%
720
16th to endNight
18%13%30%26%9%1
768
April1st to 15thNight
30%12%29%21%5%
697
16th to endNight
26%10%27%24%11%
540
May1st to 15thNight
23%6%28%29%12%
443
16th to endNight
19%7%33%29%10%
375
June1st to 15thNight
17%6%29%33%13%
360
16th to endNight
16%5%27%37%12%
360
July1st to 15thNight
15%229%38%14%
340
16th to endNight
14%426%34%17%1
421
August1st to 15thNight
17%224%33%18%3
539
16th to endNight
15%426%31%18%2
594
September1st to 15thNight
21%5%27%24%17%3
720
16th to endNight
20%5%26%26%17%2
665
October1st to 15thNight
28%9%27%24%9%
660
16th to endNight
37%12%26%19%4
704
November1st to 15thNight
25%12%31%21%8%
700
16th to endNight
33%12%28%18%6%
720
December1st to 15thNight
31%16%29%17%4
720
16th to endNight
33%13%28%20%3
939
Page generated at 2017-09-18 08:38:24. Version ac04

Copyright 2017 A. Danko


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