Lakeland Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lakeland Provincial Park clear sky chart from 2005-11-05 to 2017-04-30.

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
39%
14929
10%
45574
6%
14904
42%
14904
18%
32860

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
30%
895
7%
2685
3%
895
33%
895
12%
2119
January16th to endNight
29%
960
14%
2880
6%
960
36%
960
15%
2101
February1st to 15thNight
39%
715
10%
2423
9%
714
42%
714
16%
1745
February16th to endNight
44%
632
13%
2052
11%
632
49%
632
17%
1467
March1st to 15thNight
35%
720
12%
2105
7%
720
40%
720
19%
1548
March16th to endNight
35%
768
11%
2112
7%
768
37%
768
16%
1620
April1st to 15thNight
39%
554
14%
1658
10%
554
43%
554
23%
1126
April16th to endNight
37%
537
12%
1570
10%
537
40%
537
19%
1124
May1st to 15thNight
49%
370
7%
1195
5%
370
51%
370
27%
743
May16th to endNight
42%
342
0%
1197
0%
342
42%
342
16%
844
June1st to 15thNight
49%
330
0%
1023
0%
330
49%
330
17%
749
June16th to endNight
47%
330
0%
864
0%
330
47%
330
21%
638
July1st to 15thNight
57%
310
0%
1076
0%
310
57%
310
26%
648
July16th to endNight
57%
348
0%
1141
0%
326
58%
326
25%
691
August1st to 15thNight
63%
360
6%
1223
6%
358
64%
358
24%
750
August16th to endNight
53%
525
11%
1575
9%
525
57%
525
26%
1035
September1st to 15thNight
55%
518
13%
1599
11%
518
57%
518
27%
1012
September16th to endNight
47%
656
19%
1815
10%
656
55%
656
34%
1119
October1st to 15thNight
38%
660
14%
1976
9%
660
43%
660
19%
1398
October16th to endNight
34%
764
14%
2348
8%
764
40%
764
18%
1670
November1st to 15thNight
32%
875
13%
2465
8%
875
36%
875
17%
1851
November16th to endNight
29%
900
8%
2700
3%
900
34%
900
13%
2113
December1st to 15thNight
28%
900
6%
2880
3%
900
30%
900
10%
2334
December16th to endNight
32%
960
8%
3012
3%
960
36%
960
10%
2415

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%9%47%7%36%5%6%7%30%
46176
Night
9%10%48%7%46%5%5%7%30%
45732
TransparencyDay
50%8%18%17%4
45826
Night
50%7%15%19%5%
45586
SeeingDay
16%8%25%28%16%4
5627
Night
13%6%27%34%16%2
14943

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%13%7%8%9%46%47%6%22%
1253
16th to endDay
8%9%6%10%10%45%447%27%
1344
February1st to 15thDay
7%10%5%9%9%5%7%5%6%6%25%
1441
16th to endDay
7%13%6%10%10%48%46%7%20%
1422
March1st to 15thDay
9%11%5%8%8%47%5%6%8%23%
1854
16th to endDay
10%12%5%10%8%35%5%5%7%25%
2111
April1st to 15thDay
11%12%5%7%7%3446%7%29%
2290
16th to endDay
15%12%47%5%35%46%6%27%
2370
May1st to 15thDay
10%5%26%5%36%6%7%8%35%
2425
16th to endDay
16%7%36%6%25%5%6%7%33%
2562
June1st to 15thDay
16%8%37%7%37%6%5%7%27%
2606
16th to endDay
17%6%37%6%46%5%5%8%28%
2758
July1st to 15thDay
12%5%36%5%36%5%6%7%37%
2481
16th to endDay
11%6%25%5%36%6%7%9%34%
2636
August1st to 15thDay
10%6%25%5%36%6%7%9%36%
2398
16th to endDay
10%6%25%6%45%6%7%8%35%
2275
September1st to 15thDay
13%6%26%5%3445%7%39%
2029
16th to endDay
13%6%25%5%345%6%9%39%
1815
October1st to 15thDay
12%13%5%7%434447%31%
1653
16th to endDay
10%13%47%6%35%45%6%31%
1513
November1st to 15thDay
10%10%5%8%8%35%6%6%6%27%
1393
16th to endDay
6%11%6%10%9%5%6%6%6%6%24%
1257
December1st to 15thDay
7%13%7%13%8%5%6%7%5%7%17%
1080
16th to endDay
6%12%5%12%10%5%7%7%7%6%17%
1210
January1st to 15thNight
7%12%6%10%9%6%7%6%5%5%21%
2685
16th to endNight
7%9%5%9%8%46%5%5%7%29%
2880
February1st to 15thNight
7%10%410%9%46%5%5%7%29%
2423
16th to endNight
5%10%5%9%7%5%7%7%6%9%26%
2052
March1st to 15thNight
7%11%49%7%46%5%6%8%27%
2105
16th to endNight
10%13%6%8%6%35%5%5%7%24%
2109
April1st to 15thNight
11%8%46%5%35%5%7%8%34%
1658
16th to endNight
14%13%46%5%3426%5%32%
1570
May1st to 15thNight
9%6%37%5%3435%9%41%
1195
16th to endNight
15%7%49%5%36%45%7%30%
1197
June1st to 15thNight
14%7%35%6%46%6%5%6%31%
1023
16th to endNight
14%6%36%8%245%6%7%32%
864
July1st to 15thNight
10%4245%35%5%6%9%41%
1146
16th to endNight
9%3146%25%6%6%10%42%
1225
August1st to 15thNight
8%326%6%25%6%6%10%39%
1230
16th to endNight
10%5%15%6%35%5%6%8%39%
1575
September1st to 15thNight
13%6%1442445%7%44%
1599
16th to endNight
11%4144245%6%9%45%
1815
October1st to 15thNight
13%11%47%5%34447%33%
1976
16th to endNight
9%12%47%7%345%6%7%31%
2348
November1st to 15thNight
12%11%5%9%7%45%45%6%28%
2465
16th to endNight
6%12%6%10%9%5%5%5%47%25%
2700
December1st to 15thNight
9%13%6%11%9%46%6%5%5%20%
2880
16th to endNight
413%6%11%10%5%8%6%6%7%18%
3012

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
58%7%16%13%4
1253
16th to endDay
56%5%14%14%7%1
1344
February1st to 15thDay
55%7%18%12%5%
1441
16th to endDay
61%6%14%14%3
1422
March1st to 15thDay
57%7%17%13%3
1854
16th to endDay
57%6%15%14%4
2112
April1st to 15thDay
53%7%15%15%7%
2290
16th to endDay
55%6%13%15%7%
2370
May1st to 15thDay
43%6%12%24%12%
2425
16th to endDay
48%7%14%18%10%
2567
June1st to 15thDay
53%8%14%18%5%
2606
16th to endDay
53%8%15%17%3
2758
July1st to 15thDay
43%9%21%21%3
2322
16th to endDay
42%10%28%17%1
2457
August1st to 15thDay
40%11%29%17%1
2380
16th to endDay
42%10%28%17%2
2275
September1st to 15thDay
42%8%22%21%5%
2029
16th to endDay
39%7%21%23%6%
1815
October1st to 15thDay
51%6%18%21%2
1653
16th to endDay
51%7%17%21%2
1513
November1st to 15thDay
54%7%16%17%3
1393
16th to endDay
58%8%15%14%2
1257
December1st to 15thDay
63%8%10%14%1
1080
16th to endDay
61%7%15%10%3
1210
January1st to 15thNight
60%7%14%13%3
2685
16th to endNight
52%7%13%18%5%1
2880
February1st to 15thNight
53%6%14%18%7%
2434
16th to endNight
50%7%15%19%6%
2052
March1st to 15thNight
52%7%16%18%5%
2105
16th to endNight
56%7%12%17%6%
2112
April1st to 15thNight
46%5%16%22%8%1
1658
16th to endNight
51%411%17%11%2
1570
May1st to 15thNight
39%412%25%15%1
1196
16th to endNight
53%5%13%16%9%1
1197
June1st to 15thNight
51%8%14%17%7%
1023
16th to endNight
46%11%16%19%41
864
July1st to 15thNight
34%9%21%27%5%
1076
16th to endNight
34%11%25%26%2
1141
August1st to 15thNight
36%9%27%24%1
1223
16th to endNight
39%8%22%25%4
1575
September1st to 15thNight
39%6%21%25%6%
1599
16th to endNight
32%7%20%29%9%1
1815
October1st to 15thNight
49%6%14%23%5%
1976
16th to endNight
50%7%16%22%3
2348
November1st to 15thNight
55%5%12%20%4
2465
16th to endNight
57%9%16%13%3
2700
December1st to 15thNight
63%8%12%13%1
2880
16th to endNight
62%8%13%11%3
3012

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
6%5%25%31%23%8%
60
16th to endDay
12%325%39%17%3
64
February1st to 15thDay
15%13%24%28%17%
69
16th to endDay
16%6%18%43%12%3
81
March1st to 15thDay
15%14%39%24%5%
243
16th to endDay
15%13%38%24%7%
288
April1st to 15thDay
20%13%35%20%8%
269
16th to endDay
24%10%26%25%11%2
308
May1st to 15thDay
11%11%21%30%19%5%
393
16th to endDay
20%5%21%26%20%5%
437
June1st to 15thDay
19%11%25%23%15%4
420
16th to endDay
17%5%20%29%21%5%
538
July1st to 15thDay
14%5%23%33%19%4
400
16th to endDay
12%6%23%30%19%7%
445
August1st to 15thDay
13%318%31%25%7%
371
16th to endDay
13%10%26%31%16%1
268
September1st to 15thDay
22%9%25%27%12%2
255
16th to endDay
17%10%29%28%12%1
255
October1st to 15thDay
28%10%23%25%10%2
96
16th to endDay
23%15%21%19%17%1
96
November1st to 15thDay
21%236%28%9%1
87
16th to endDay
5%16%28%16%15%18%
60
December1st to 15thDay
1333%41%11%8%
60
16th to endDay
9%6%34%31%12%6%
64
January1st to 15thNight
11%7%31%34%12%2
900
16th to endNight
12%10%33%33%8%1
960
February1st to 15thNight
13%5%24%37%17%1
722
16th to endNight
9%427%37%18%2
632
March1st to 15thNight
11%6%33%33%12%1
720
16th to endNight
13%7%29%31%15%2
768
April1st to 15thNight
14%5%31%30%15%1
554
16th to endNight
20%6%26%29%16%1
537
May1st to 15thNight
10%7%22%40%14%4
371
16th to endNight
18%5%20%31%20%2
343
June1st to 15thNight
17%418%35%21%2
330
16th to endNight
17%318%31%25%2
330
July1st to 15thNight
11%218%41%24%
310
16th to endNight
10%416%38%26%4
348
August1st to 15thNight
10%213%37%30%6%
360
16th to endNight
11%321%38%24%
525
September1st to 15thNight
17%216%35%26%1
518
16th to endNight
12%5%26%38%15%1
656
October1st to 15thNight
17%5%26%33%13%3
660
16th to endNight
17%5%31%32%12%
764
November1st to 15thNight
17%5%32%32%9%3
875
16th to endNight
11%8%33%32%12%1
900
December1st to 15thNight
16%7%27%32%12%3
900
16th to endNight
8%6%29%35%16%3
960
Page generated at 2017-04-30 18:40:04. Version ac04

Copyright 2017 A. Danko


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