Manning Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Manning Provincial Park clear sky chart from 2005-11-05 to 2018-04-23.

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
30%
15306
9%
49370
7%
15276
33%
15276
13%
36596

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
24%
803
7%
2818
5%
799
27%
799
9%
2255
January16th to endNight
22%
832
7%
2912
5%
832
25%
832
10%
2266
February1st to 15thNight
20%
761
5%
2532
4%
760
22%
760
7%
2100
February16th to endNight
26%
684
9%
2151
7%
684
30%
684
11%
1680
March1st to 15thNight
18%
780
6%
2304
4%
780
20%
780
11%
1817
March16th to endNight
19%
832
5%
2194
2%
832
21%
832
9%
1838
April1st to 15thNight
23%
779
5%
1949
3%
779
23%
779
12%
1601
April16th to endNight
27%
539
8%
1655
5%
539
31%
539
12%
1270
May1st to 15thNight
38%
359
10%
1440
13%
359
43%
359
14%
976
May16th to endNight
36%
375
5%
1496
8%
374
38%
374
10%
1082
June1st to 15thNight
36%
360
3%
1347
2%
360
37%
360
15%
929
June16th to endNight
41%
360
6%
1260
2%
360
43%
360
16%
832
July1st to 15thNight
59%
340
9%
1207
7%
340
62%
340
32%
618
July16th to endNight
56%
376
15%
1416
18%
354
68%
354
38%
619
August1st to 15thNight
66%
360
17%
1432
23%
358
69%
358
33%
688
August16th to endNight
56%
664
20%
1810
13%
664
59%
664
37%
1031
September1st to 15thNight
51%
720
21%
1800
10%
720
54%
720
36%
1093
September16th to endNight
38%
716
18%
1953
11%
716
43%
716
23%
1342
October1st to 15thNight
32%
720
10%
2160
9%
720
35%
720
16%
1544
October16th to endNight
28%
768
8%
2435
7%
768
32%
768
12%
1860
November1st to 15thNight
14%
760
5%
2613
4%
760
16%
760
6%
2217
November16th to endNight
18%
780
5%
2730
3%
780
22%
780
7%
2200
December1st to 15thNight
24%
780
6%
2730
6%
780
25%
780
8%
2202
December16th to endNight
15%
858
6%
3026
3%
858
18%
858
7%
2536

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%15%6%9%6%35%445%27%
50163
Night
8%14%6%10%7%35%45%6%27%
49528
Cloud CoverDay
9%13%6%10%7%45%45%6%28%
50163
Night
5%11%5%10%8%46%5%5%7%28%
49531
TransparencyDay
55%8%12%14%7%1
49825
Night
52%10%14%15%6%1
49370
SeeingDay
17%26%29%17%6%2
6454
Night
10%23%27%23%12%1
15310

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
January1st to 15thDay
9%21%6%11%7%45%45%5%18%
1447
16th to endDay
7%18%7%11%7%45%45%5%22%
1664
February1st to 15thDay
7%22%8%12%7%3435%6%16%
1659
16th to endDay
420%10%12%8%45%5%4418%
1609
March1st to 15thDay
5%22%9%12%9%5%6%445%14%
1985
16th to endDay
7%23%11%13%9%35%44410%
2382
April1st to 15thDay
10%27%9%12%7%35%33411%
2329
16th to endDay
12%19%8%10%7%35%445%16%
2417
May1st to 15thDay
11%18%5%8%5%35%45%6%25%
2511
16th to endDay
23%16%5%7%6%35%446%18%
2615
June1st to 15thDay
23%14%47%6%34445%21%
2610
16th to endDay
20%11%47%5%345%46%26%
2700
July1st to 15thDay
11%5%24424346%49%
2679
16th to endDay
7%6%24323346%56%
2657
August1st to 15thDay
8%5%2442435%5%53%
2520
16th to endDay
9%6%25%5%3445%6%45%
2390
September1st to 15thDay
10%8%35%323325%51%
2160
16th to endDay
15%12%46%6%33445%33%
2004
October1st to 15thDay
11%16%48%6%25%45%6%27%
1800
16th to endDay
12%17%6%10%6%35%44424%
1788
November1st to 15thDay
12%25%8%11%7%345%4314%
1573
16th to endDay
8%17%7%12%9%45%5%46%18%
1560
December1st to 15thDay
5%18%8%15%9%45%335%20%
1560
16th to endDay
5%19%9%15%9%36%445%15%
1544
January1st to 15thNight
9%18%9%11%7%35%5%45%19%
2818
16th to endNight
7%19%9%12%8%35%45%6%18%
2912
February1st to 15thNight
7%22%8%13%8%35%445%17%
2520
16th to endNight
5%17%10%11%8%46%5%5%6%21%
2151
March1st to 15thNight
5%16%8%13%7%46%5%5%7%18%
2304
16th to endNight
5%18%8%13%9%5%6%5%6%416%
2190
April1st to 15thNight
7%19%7%10%8%46%445%19%
1949
16th to endNight
6%17%6%9%7%36%45%8%23%
1655
May1st to 15thNight
9%14%45%5%345%5%6%34%
1439
16th to endNight
14%12%47%6%35%46%8%27%
1496
June1st to 15thNight
14%12%47%5%35%45%7%30%
1347
16th to endNight
13%7%26%5%26%45%7%37%
1260
July1st to 15thNight
5%41331335%8%57%
1278
16th to endNight
4223323337%63%
1512
August1st to 15thNight
45%13323346%61%
1440
16th to endNight
45%15%32445%7%54%
1810
September1st to 15thNight
7%6%2442435%5%53%
1800
16th to endNight
11%7%46%6%35%45%8%34%
1953
October1st to 15thNight
11%12%410%6%3445%5%33%
2160
16th to endNight
12%15%5%10%7%45%45%6%22%
2435
November1st to 15thNight
12%20%7%12%8%45%445%12%
2613
16th to endNight
7%18%9%12%9%46%445%17%
2730
December1st to 15thNight
6%16%8%14%8%46%5%5%5%18%
2730
16th to endNight
7%18%9%14%10%45%445%14%
3026

Percentage Cloud Cover SW (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
6%13%7%13%10%46%5%5%7%19%
1447
16th to endDay
5%13%7%12%7%45%5%7%8%23%
1664
February1st to 15thDay
5%17%9%12%9%5%45%5%7%18%
1659
16th to endDay
315%10%13%11%45%5%5%5%19%
1609
March1st to 15thDay
316%8%15%8%5%7%5%5%416%
1985
16th to endDay
5%20%9%16%10%45%5%45%11%
2382
April1st to 15thDay
8%22%10%13%9%45%43412%
2329
16th to endDay
10%18%6%12%8%45%5%45%17%
2417
May1st to 15thDay
9%17%5%8%7%35%45%6%25%
2511
16th to endDay
20%14%6%9%7%35%445%17%
2615
June1st to 15thDay
20%13%5%8%7%34445%21%
2610
16th to endDay
17%10%48%7%35%5%46%26%
2700
July1st to 15thDay
8%6%35%43335%7%48%
2679
16th to endDay
5%433425%345%56%
2657
August1st to 15thDay
6%5%2443445%6%51%
2520
16th to endDay
7%6%26%5%35%5%5%6%46%
2390
September1st to 15thDay
8%7%25%423335%51%
2160
16th to endDay
12%11%47%6%34446%34%
2004
October1st to 15thDay
9%16%49%6%3445%6%29%
1800
16th to endDay
8%14%410%9%45%6%5%5%25%
1788
November1st to 15thDay
8%19%9%11%9%46%5%46%14%
1573
16th to endDay
413%7%13%9%5%6%6%6%6%19%
1560
December1st to 15thDay
413%7%15%12%46%45%6%19%
1560
16th to endDay
314%8%15%10%5%8%7%5%5%15%
1544
January1st to 15thNight
5%11%7%13%10%6%8%6%5%5%19%
2817
16th to endNight
413%7%13%9%47%6%6%7%20%
2912
February1st to 15thNight
5%14%8%12%11%46%5%5%6%17%
2520
16th to endNight
312%7%13%8%47%5%6%6%22%
2151
March1st to 15thNight
312%6%12%8%5%8%6%7%8%20%
2304
16th to endNight
312%7%13%10%5%7%7%7%6%17%
2194
April1st to 15thNight
5%13%7%11%9%5%7%6%46%21%
1949
16th to endNight
5%13%6%11%8%47%6%5%7%25%
1655
May1st to 15thNight
6%14%38%6%245%5%7%35%
1439
16th to endNight
11%10%46%6%45%6%7%8%27%
1496
June1st to 15thNight
11%8%5%7%7%35%5%6%7%30%
1347
16th to endNight
10%6%26%6%35%5%6%8%37%
1260
July1st to 15thNight
3313324348%58%
1278
16th to endNight
3222423346%63%
1512
August1st to 15thNight
4323322447%61%
1440
16th to endNight
342442445%7%54%
1810
September1st to 15thNight
6%325%424446%53%
1800
16th to endNight
8%6%36%7%46%37%8%36%
1953
October1st to 15thNight
7%11%48%7%45%5%5%6%33%
2160
16th to endNight
7%12%5%10%10%36%5%6%7%23%
2435
November1st to 15thNight
7%16%7%12%10%46%5%6%6%14%
2613
16th to endNight
412%7%12%11%5%6%6%5%7%19%
2730
December1st to 15thNight
411%8%14%10%5%7%6%5%5%18%
2730
16th to endNight
414%8%15%10%5%7%5%5%6%15%
3026

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
62%10%10%11%31
1447
16th to endDay
55%9%14%11%7%1
1664
February1st to 15thDay
62%10%12%7%5%1
1659
16th to endDay
64%6%12%11%3
1609
March1st to 15thDay
66%10%11%9%1
1985
16th to endDay
72%9%10%6%
2382
April1st to 15thDay
74%7%8%7%1
2329
16th to endDay
65%8%13%8%3
2417
May1st to 15thDay
57%7%13%12%7%
2511
16th to endDay
68%6%12%11%1
2619
June1st to 15thDay
64%5%11%13%41
2610
16th to endDay
58%7%11%16%6%
2700
July1st to 15thDay
36%6%12%23%16%4
2521
16th to endDay
28%7%12%24%20%5%
2490
August1st to 15thDay
32%6%15%26%15%4
2503
16th to endDay
35%7%15%26%12%2
2390
September1st to 15thDay
35%412%24%19%3
2160
16th to endDay
49%5%12%16%12%2
2004
October1st to 15thDay
53%7%13%17%8%
1800
16th to endDay
56%10%10%17%4
1788
November1st to 15thDay
68%10%10%7%21
1573
16th to endDay
60%11%9%11%42
1560
December1st to 15thDay
62%10%9%11%41
1560
16th to endDay
65%12%9%7%4
1544
January1st to 15thNight
62%9%10%10%5%1
2818
16th to endNight
58%10%11%11%6%2
2912
February1st to 15thNight
64%11%9%9%31
2532
16th to endNight
57%9%11%16%2
2151
March1st to 15thNight
55%12%17%11%3
2304
16th to endNight
61%13%14%9%1
2194
April1st to 15thNight
60%10%15%11%2
1949
16th to endNight
55%10%17%12%3
1655
May1st to 15thNight
45%11%16%19%7%
1440
16th to endNight
50%12%19%14%2
1496
June1st to 15thNight
49%7%19%16%6%
1347
16th to endNight
42%10%20%21%5%
1260
July1st to 15thNight
23%7%18%30%17%2
1207
16th to endNight
19%419%31%21%2
1416
August1st to 15thNight
23%7%20%29%15%3
1432
16th to endNight
25%7%21%30%14%
1810
September1st to 15thNight
27%7%14%27%20%2
1800
16th to endNight
42%8%14%21%9%3
1953
October1st to 15thNight
48%8%14%17%9%
2160
16th to endNight
56%9%11%16%6%
2435
November1st to 15thNight
65%12%10%7%21
2613
16th to endNight
59%12%10%9%5%2
2730
December1st to 15thNight
61%10%10%12%3
2730
16th to endNight
66%10%9%9%3
3026

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
4430%33%20%7%
90
16th to endDay
7%23%44%20%3
96
February1st to 15thDay
17%27%40%10%3
229
16th to endDay
13%30%34%16%41
267
March1st to 15thDay
19%39%27%10%3
330
16th to endDay
22%36%24%12%4
352
April1st to 15thDay
23%36%23%11%3
329
16th to endDay
25%33%22%11%5%1
288
May1st to 15thDay
21%30%26%15%22
288
16th to endDay
30%20%22%16%7%2
330
June1st to 15thDay
22%29%24%16%5%
405
16th to endDay
18%32%27%14%5%1
495
July1st to 15thDay
12%23%32%23%7%
455
16th to endDay
8%26%31%24%35%
327
August1st to 15thDay
9%12%32%27%12%5%
315
16th to endDay
9%21%32%23%10%3
332
September1st to 15thDay
14%24%26%21%10%2
315
16th to endDay
20%22%26%18%8%2
315
October1st to 15thDay
17%30%29%14%6%1
315
16th to endDay
17%17%33%24%6%
204
November1st to 15thDay
16%24%40%13%2
101
16th to endDay
10%20%41%11%10%7%
90
December1st to 15thDay
5%13%34%24%15%6%
90
16th to endDay
417%54%16%6%1
96
January1st to 15thNight
11%26%30%19%11%
803
16th to endNight
10%24%34%21%6%2
832
February1st to 15thNight
12%25%29%23%7%
764
16th to endNight
8%26%27%24%11%1
684
March1st to 15thNight
9%31%33%17%7%
780
16th to endNight
9%31%30%21%6%
832
April1st to 15thNight
11%26%28%23%9%1
779
16th to endNight
12%25%25%25%8%2
539
May1st to 15thNight
13%23%18%27%15%2
360
16th to endNight
18%20%14%25%19%1
375
June1st to 15thNight
13%22%21%23%17%1
360
16th to endNight
10%22%18%33%13%1
360
July1st to 15thNight
5%17%13%37%25%1
340
16th to endNight
419%16%31%25%2
376
August1st to 15thNight
8%11%8%30%37%3
360
16th to endNight
6%13%19%33%24%2
664
September1st to 15thNight
7%13%20%26%23%8%
720
16th to endNight
12%14%27%24%18%4
716
October1st to 15thNight
14%20%24%26%12%1
720
16th to endNight
12%20%31%24%9%1
768
November1st to 15thNight
14%26%35%18%3
760
16th to endNight
10%30%32%16%7%2
780
December1st to 15thNight
9%24%31%23%9%1
780
16th to endNight
9%27%38%20%3
858
Page generated at 2018-04-24 07:03:03. Version ac04

Copyright 2018 A. Danko


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