Smiley's Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Smiley's Provincial Park clear sky chart from 2005-11-05 to 2018-01-12.

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
21%
15628
10%
48124
5%
15583
26%
15583
13%
36574

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
11%
806
6%
2662
2%
802
16%
802
6%
2191
January16th to endNight
12%
773
7%
2523
2%
773
18%
773
6%
2101
February1st to 15thNight
11%
704
5%
2286
2%
701
15%
701
7%
1924
February16th to endNight
16%
631
6%
2036
1%
631
21%
631
7%
1628
March1st to 15thNight
15%
720
12%
1986
4%
720
23%
720
12%
1546
March16th to endNight
16%
768
12%
2112
3%
768
24%
768
14%
1608
April1st to 15thNight
16%
542
12%
1799
5%
542
24%
542
11%
1346
April16th to endNight
18%
540
13%
1632
5%
540
24%
540
15%
1194
May1st to 15thNight
20%
540
9%
1518
4%
540
25%
540
13%
1188
May16th to endNight
20%
561
9%
1496
2%
560
25%
560
17%
1130
June1st to 15thNight
21%
534
6%
1434
2%
534
25%
534
15%
1124
June16th to endNight
30%
360
8%
1260
4%
360
35%
360
15%
908
July1st to 15thNight
35%
412
8%
1262
5%
412
39%
412
24%
827
July16th to endNight
33%
565
9%
1461
6%
532
34%
532
19%
1078
August1st to 15thNight
38%
539
11%
1608
8%
535
40%
535
20%
1145
August16th to endNight
38%
573
16%
1784
10%
573
44%
573
23%
1164
September1st to 15thNight
32%
540
16%
1800
9%
540
42%
540
22%
1128
September16th to endNight
35%
699
21%
2001
13%
699
41%
699
24%
1313
October1st to 15thNight
27%
720
16%
2160
8%
720
34%
720
21%
1469
October16th to endNight
17%
768
14%
2304
5%
768
26%
768
14%
1676
November1st to 15thNight
21%
803
11%
2628
7%
803
26%
803
12%
1985
November16th to endNight
19%
825
9%
2730
4%
825
25%
825
10%
2123
December1st to 15thNight
11%
825
6%
2730
1%
825
18%
825
6%
2269
December16th to endNight
8%
880
5%
2912
1%
880
13%
880
4%
2509

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
20%11%47%6%34446%27%
49209
Night
19%11%48%6%34446%26%
48296
TransparencyDay
57%6%11%16%7%
48899
Night
57%6%11%16%6%
48124
SeeingDay
29%16%29%16%6%1
7889
Night
26%16%31%20%5%
15628

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
16%16%6%11%10%5%5%44413%
1520
16th to endDay
16%12%6%10%10%6%7%43416%
1698
February1st to 15thDay
17%13%6%12%11%5%5%5%3414%
1575
16th to endDay
12%17%7%10%6%43446%21%
1437
March1st to 15thDay
16%15%5%9%8%4323424%
1962
16th to endDay
18%15%7%8%5%2333329%
2112
April1st to 15thDay
21%14%47%7%24435%24%
2149
16th to endDay
23%11%46%423345%29%
2325
May1st to 15thDay
26%11%37%5%23446%25%
2431
16th to endDay
23%11%35%43445%7%26%
2618
June1st to 15thDay
28%10%36%5%2435%5%23%
2535
16th to endDay
22%9%46%5%3435%8%26%
2700
July1st to 15thDay
17%6%24435%46%9%34%
2607
16th to endDay
18%9%36%5%36%5%5%8%26%
2606
August1st to 15thDay
20%8%35%5%25%5%5%6%31%
2340
16th to endDay
15%6%3432445%7%42%
2417
September1st to 15thDay
20%6%345%23346%38%
2160
16th to endDay
18%6%24323346%42%
1956
October1st to 15thDay
20%8%14433347%37%
1800
16th to endDay
20%12%47%6%24445%27%
1920
November1st to 15thDay
22%15%46%5%2444425%
1557
16th to endDay
19%16%5%8%6%34445%20%
1560
December1st to 15thDay
24%15%8%10%8%3433414%
1560
16th to endDay
23%15%8%11%10%3442213%
1664
January1st to 15thNight
15%15%6%13%9%44445%16%
2662
16th to endNight
17%13%6%11%9%5%7%5%45%15%
2523
February1st to 15thNight
18%13%6%11%11%5%6%44413%
2285
16th to endNight
14%16%6%11%9%3444421%
2036
March1st to 15thNight
18%12%47%7%44445%26%
1974
16th to endNight
18%13%6%7%5%23435%28%
2112
April1st to 15thNight
22%12%46%5%24445%27%
1799
16th to endNight
23%9%45%434445%31%
1632
May1st to 15thNight
25%10%35%5%345%5%6%24%
1518
16th to endNight
18%8%36%4345%6%8%29%
1494
June1st to 15thNight
26%8%45%43345%7%25%
1434
16th to endNight
19%7%46%6%35%5%5%7%28%
1260
July1st to 15thNight
13%5%235%246%7%10%37%
1338
16th to endNight
16%6%36%5%36%46%9%29%
1560
August1st to 15thNight
18%7%26%4345%5%7%34%
1620
16th to endNight
14%6%25%5%26%447%41%
1784
September1st to 15thNight
15%5%345%24447%41%
1800
16th to endNight
15%7%25%423446%42%
2001
October1st to 15thNight
19%6%246%34446%37%
2160
16th to endNight
23%9%36%434446%30%
2304
November1st to 15thNight
22%12%46%5%23345%26%
2628
16th to endNight
18%14%5%8%7%34435%23%
2730
December1st to 15thNight
22%13%6%11%8%3433416%
2730
16th to endNight
22%16%8%10%9%3433313%
2912

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
72%7%9%9%1
1521
16th to endDay
69%6%9%10%4
1698
February1st to 15thDay
71%6%8%8%3
1578
16th to endDay
64%5%10%13%5%
1437
March1st to 15thDay
64%49%13%7%1
1973
16th to endDay
60%48%17%9%1
2112
April1st to 15thDay
62%5%6%13%10%1
2149
16th to endDay
56%5%9%17%11%1
2325
May1st to 15thDay
60%5%9%16%7%
2431
16th to endDay
58%6%10%16%6%
2622
June1st to 15thDay
62%5%10%14%5%
2535
16th to endDay
56%7%11%15%8%
2700
July1st to 15thDay
44%8%16%20%9%
2455
16th to endDay
54%7%12%19%4
2442
August1st to 15thDay
52%7%13%18%8%
2327
16th to endDay
39%7%16%27%9%
2417
September1st to 15thDay
46%5%13%22%11%1
2160
16th to endDay
41%6%10%26%15%
1956
October1st to 15thDay
46%5%11%25%10%
1800
16th to endDay
57%5%10%20%5%
1920
November1st to 15thDay
61%7%10%13%6%
1557
16th to endDay
65%7%12%10%4
1560
December1st to 15thDay
72%49%11%1
1560
16th to endDay
76%48%6%4
1664
January1st to 15thNight
68%6%11%10%2
2662
16th to endNight
68%7%9%12%2
2523
February1st to 15thNight
71%5%10%8%3
2286
16th to endNight
65%5%12%10%5%
2036
March1st to 15thNight
59%5%11%15%7%
1986
16th to endNight
57%49%17%8%
2112
April1st to 15thNight
59%5%8%15%10%2
1799
16th to endNight
55%49%15%12%1
1632
May1st to 15thNight
59%6%10%17%5%
1518
16th to endNight
52%8%14%17%6%1
1496
June1st to 15thNight
58%6%12%15%5%
1434
16th to endNight
52%8%13%18%6%
1260
July1st to 15thNight
38%10%20%20%9%
1262
16th to endNight
49%9%16%17%6%
1461
August1st to 15thNight
47%8%13%22%7%
1608
16th to endNight
41%7%16%23%10%
1784
September1st to 15thNight
41%6%12%28%11%1
1800
16th to endNight
41%5%11%28%12%
2001
October1st to 15thNight
47%412%25%10%
2160
16th to endNight
53%5%11%19%8%
2304
November1st to 15thNight
57%6%12%15%6%
2628
16th to endNight
61%5%14%13%4
2730
December1st to 15thNight
69%6%10%10%2
2730
16th to endNight
74%5%7%9%3
2912

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
28%20%31%18%
273
16th to endDay
28%23%33%11%3
256
February1st to 15thDay
27%22%32%13%2
236
16th to endDay
24%25%30%13%5%
212
March1st to 15thDay
27%30%25%12%4
270
16th to endDay
32%26%24%8%6%1
288
April1st to 15thDay
33%25%28%10%1
270
16th to endDay
28%21%30%13%5%
270
May1st to 15thDay
37%16%24%14%41
387
16th to endDay
33%13%33%14%3
519
June1st to 15thDay
37%15%26%15%4
495
16th to endDay
31%11%32%17%42
495
July1st to 15thDay
22%7%36%22%9%1
475
16th to endDay
25%9%30%23%9%1
467
August1st to 15thDay
24%7%32%23%9%1
313
16th to endDay
19%9%33%22%13%2
332
September1st to 15thDay
23%12%33%21%8%
315
16th to endDay
21%11%30%23%8%3
304
October1st to 15thDay
25%9%34%16%10%4
270
16th to endDay
32%23%21%14%6%1
288
November1st to 15thDay
29%17%26%16%8%2
280
16th to endDay
32%20%28%11%6%1
285
December1st to 15thDay
41%19%24%11%1
285
16th to endDay
35%25%26%8%2
304
January1st to 15thNight
27%22%32%16%1
806
16th to endNight
27%23%30%15%2
773
February1st to 15thNight
29%20%32%16%
704
16th to endNight
27%22%28%16%4
631
March1st to 15thNight
26%22%30%16%3
720
16th to endNight
30%16%30%17%4
768
April1st to 15thNight
30%18%30%17%3
542
16th to endNight
28%17%33%17%3
540
May1st to 15thNight
31%14%30%17%5%
540
16th to endNight
22%15%38%21%2
561
June1st to 15thNight
30%12%32%22%2
534
16th to endNight
23%7%32%30%5%
360
July1st to 15thNight
16%341%31%8%
412
16th to endNight
20%6%34%29%9%
565
August1st to 15thNight
20%7%28%32%10%
539
16th to endNight
17%7%30%32%11%
573
September1st to 15thNight
18%9%35%27%8%
540
16th to endNight
20%9%30%26%11%1
699
October1st to 15thNight
23%12%32%21%8%1
720
16th to endNight
29%18%30%16%5%
768
November1st to 15thNight
31%13%27%19%6%1
803
16th to endNight
28%20%26%19%4
825
December1st to 15thNight
35%20%27%13%2
825
16th to endNight
33%23%28%11%2
880
Page generated at 2018-01-12 23:01:30. Version ac04

Copyright 2018 A. Danko


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