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 2005-11-06 to 2024-01-17.

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
38%
23578
11%
74603
7%
23548
43%
23548
18%
51745

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
30%
946
10%
2836
4%
946
35%
946
14%
2178
January11th to 20thNight
30%
935
14%
2803
8%
935
36%
935
15%
2085
January21st to endNight
24%
990
10%
2970
4%
990
30%
990
11%
2327
February1st to 10thNight
37%
746
11%
2546
10%
746
42%
746
15%
1832
February11th to 20thNight
34%
701
14%
2283
11%
700
40%
700
17%
1627
February21st to endNight
48%
592
16%
1924
13%
592
54%
592
20%
1312
March1st to 10thNight
40%
720
11%
2167
10%
720
43%
720
20%
1569
March11th to 20thNight
34%
720
17%
1980
8%
720
40%
720
22%
1405
March21st to endNight
38%
792
11%
2178
6%
792
41%
792
19%
1626
April1st to 10thNight
42%
562
16%
1678
11%
562
46%
562
24%
1111
April11th to 20thNight
35%
533
14%
1601
10%
533
40%
533
18%
1149
April21st to endNight
39%
540
11%
1558
9%
540
41%
540
22%
1095
May1st to 10thNight
46%
428
9%
1328
7%
428
48%
428
26%
860
May11th to 20thNight
48%
354
4%
1239
3%
354
49%
354
27%
735
May21st to endNight
45%
388
0%
1358
0%
388
45%
388
18%
929
June1st to 10thNight
47%
360
0%
1134
0%
360
47%
360
18%
809
June11th to 20thNight
42%
360
0%
1054
0%
360
42%
360
15%
803
June21st to endNight
53%
360
0%
900
0%
360
53%
360
26%
643
July1st to 10thNight
58%
350
0%
1210
0%
350
58%
350
26%
728
July11th to 20thNight
55%
348
0%
1218
0%
348
55%
348
22%
777
July21st to endNight
60%
394
1%
1302
0%
372
61%
372
29%
720
August1st to 10thNight
62%
358
7%
1246
6%
356
65%
356
25%
743
August11th to 20thNight
54%
495
9%
1547
8%
495
58%
495
29%
956
August21st to endNight
53%
594
16%
1782
13%
594
58%
594
28%
1136
September1st to 10thNight
49%
540
14%
1678
11%
540
51%
540
26%
1057
September11th to 20thNight
50%
667
16%
1927
11%
667
55%
667
30%
1227
September21st to endNight
46%
720
20%
1980
11%
720
54%
720
33%
1223
October1st to 10thNight
40%
720
16%
2150
11%
720
45%
720
23%
1450
October11th to 20thNight
38%
720
16%
2251
8%
720
46%
720
23%
1464
October21st to endNight
28%
890
14%
2672
6%
890
36%
890
16%
1938
November1st to 10thNight
29%
925
13%
2590
8%
925
33%
925
15%
1997
November11th to 20thNight
27%
950
9%
2778
5%
950
32%
950
13%
2203
November21st to endNight
26%
950
9%
2851
2%
950
33%
950
15%
2153
December1st to 10thNight
32%
950
11%
3040
5%
950
38%
950
16%
2202
December11th to 20thNight
25%
950
8%
3717
3%
949
30%
949
8%
2892
December21st to endNight
34%
1030
7%
5127
5%
1026
39%
1026
11%
2784

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
10%9%48%7%46%6%6%8%32%
74736
Night
8%9%49%8%46%6%6%8%33%
75078
TransparencyDay
48%8%17%20%6%
74416
Night
48%8%16%21%8%1
74916
SeeingDay
14%10%28%29%15%4
14600
Night
13%7%29%34%15%2
23601

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 10thDay
7%13%8%10%10%46%5%6%6%25%
1329
11th to 20thDay
9%12%5%11%10%45%6%7%8%25%
1302
21st to endDay
8%9%7%11%12%5%6%6%5%7%23%
1386
February1st to 10thDay
6%11%5%11%10%5%8%6%6%7%24%
1431
11th to 20thDay
6%11%5%7%11%6%8%6%8%8%23%
1564
21st to endDay
5%10%6%11%10%6%8%6%8%9%22%
1332
March1st to 10thDay
7%12%6%10%9%5%8%6%7%9%22%
1790
11th to 20thDay
9%10%6%9%8%45%45%7%32%
1979
21st to endDay
9%13%5%11%7%45%6%5%8%28%
2178
April1st to 10thDay
8%11%5%8%9%5%5%5%6%8%30%
2279
11th to 20thDay
12%13%48%7%35%5%6%6%29%
2310
21st to endDay
13%10%48%6%46%5%7%8%30%
2402
May1st to 10thDay
10%7%38%7%47%6%7%8%32%
2632
11th to 20thDay
10%6%26%7%46%6%7%7%39%
2654
21st to endDay
15%7%36%6%35%5%6%8%37%
2917
June1st to 10thDay
16%7%36%7%36%6%7%8%31%
2823
11th to 20thDay
20%8%47%7%46%6%5%8%26%
2898
21st to endDay
12%6%37%6%47%7%6%10%33%
3056
July1st to 10thDay
11%6%36%6%46%6%7%7%38%
2709
11th to 20thDay
12%6%36%6%46%6%6%10%36%
2700
21st to endDay
9%5%36%5%36%6%8%9%40%
2938
August1st to 10thDay
11%6%25%5%36%6%6%9%39%
2686
11th to 20thDay
8%6%25%5%35%7%7%8%43%
2351
21st to endDay
10%6%25%6%45%6%7%9%39%
2574
September1st to 10thDay
13%7%37%6%35%5%6%7%39%
2282
11th to 20thDay
15%8%36%5%35%5%6%7%38%
2030
21st to endDay
10%7%26%6%345%6%10%41%
1980
October1st to 10thDay
10%12%5%8%7%35%46%7%33%
1810
11th to 20thDay
10%10%5%7%6%445%5%7%36%
1706
21st to endDay
11%13%5%11%7%36%46%7%28%
1666
November1st to 10thDay
10%15%6%9%9%5%6%6%5%6%23%
1488
11th to 20thDay
8%12%6%11%10%5%6%5%6%7%24%
1401
21st to endDay
5%11%7%13%9%45%6%6%7%27%
1326
December1st to 10thDay
5%10%7%11%8%6%8%6%7%8%23%
1140
11th to 20thDay
7%13%5%11%11%5%5%6%5%7%26%
1439
21st to endDay
37%38%6%5%6%6%7%8%39%
2248
January1st to 10thNight
7%11%6%10%10%6%7%6%6%7%24%
2836
11th to 20thNight
5%11%6%12%9%5%7%6%6%7%26%
2803
21st to endNight
8%12%7%12%9%5%7%6%5%7%22%
2970
February1st to 10thNight
6%9%411%9%5%8%7%6%9%26%
2546
11th to 20thNight
6%11%5%10%8%5%5%6%6%7%29%
2283
21st to endNight
47%48%7%5%8%8%8%9%29%
1924
March1st to 10thNight
5%11%5%11%8%5%6%5%7%8%28%
2167
11th to 20thNight
9%11%47%6%46%5%6%9%32%
1980
21st to endNight
8%13%7%9%7%36%6%7%8%28%
2178
April1st to 10thNight
8%9%5%6%6%36%5%7%9%36%
1678
11th to 20thNight
9%9%49%8%5%7%5%7%7%31%
1601
21st to endNight
13%11%47%6%3447%7%33%
1558
May1st to 10thNight
9%6%37%7%445%6%10%39%
1328
11th to 20thNight
9%6%46%6%35%5%7%7%44%
1239
21st to endNight
15%8%49%6%36%46%7%33%
1358
June1st to 10thNight
17%7%35%6%47%7%6%7%31%
1134
11th to 20thNight
15%12%37%7%5%6%6%5%7%29%
1054
21st to endNight
10%5%36%9%46%5%7%7%39%
900
July1st to 10thNight
10%5%25%436%5%7%10%43%
1245
11th to 20thNight
10%5%26%7%36%7%6%8%40%
1260
21st to endNight
8%4245%35%5%7%11%46%
1379
August1st to 10thNight
9%326%8%36%6%6%9%43%
1253
11th to 20thNight
9%5%25%6%35%6%7%10%43%
1547
21st to endNight
10%6%25%6%35%46%7%44%
1782
September1st to 10thNight
13%7%25%435%5%5%8%43%
1678
11th to 20thNight
12%6%26%5%345%6%7%44%
1927
21st to endNight
10%425%5%35%5%7%8%46%
1980
October1st to 10thNight
11%9%47%6%35%5%5%8%38%
2150
11th to 20thNight
9%9%47%7%35%5%5%8%39%
2251
21st to endNight
10%12%6%10%7%45%46%7%30%
2672
November1st to 10thNight
12%14%5%10%8%45%5%5%6%25%
2590
11th to 20thNight
8%12%6%11%10%6%7%5%6%7%22%
2778
21st to endNight
6%12%6%11%9%45%5%5%7%28%
2851
December1st to 10thNight
8%10%5%10%8%5%6%6%6%7%28%
3040
11th to 20thNight
7%13%6%12%12%6%7%6%5%6%21%
3753
21st to endNight
37%37%7%46%6%6%8%41%
5405

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
58%5%14%15%7%
1329
11th to 20thDay
57%7%14%15%7%1
1302
21st to endDay
59%7%12%13%9%
1386
February1st to 10thDay
56%7%14%15%8%
1431
11th to 20thDay
54%8%17%16%5%
1573
21st to endDay
55%8%15%16%6%
1332
March1st to 10thDay
57%8%19%13%4
1790
11th to 20thDay
50%7%17%19%8%
1980
21st to endDay
55%8%16%17%4
2178
April1st to 10thDay
50%8%15%18%9%
2279
11th to 20thDay
53%7%13%18%9%1
2310
21st to endDay
50%8%14%20%8%1
2402
May1st to 10thDay
47%7%13%21%12%1
2632
11th to 20thDay
40%8%13%25%13%1
2658
21st to endDay
44%7%14%24%11%1
2918
June1st to 10thDay
48%9%15%20%7%
2823
11th to 20thDay
55%9%13%18%4
2898
21st to endDay
44%10%19%21%5%
3056
July1st to 10thDay
41%10%18%25%5%1
2635
11th to 20thDay
42%9%26%20%2
2619
21st to endDay
37%10%26%25%3
2775
August1st to 10thDay
39%10%25%23%2
2668
11th to 20thDay
36%10%28%23%4
2351
21st to endDay
38%9%25%24%3
2574
September1st to 10thDay
41%9%20%24%6%1
2282
11th to 20thDay
45%6%20%24%5%
2030
21st to endDay
37%9%20%25%9%1
1980
October1st to 10thDay
49%7%19%20%5%
1810
11th to 20thDay
46%8%13%27%6%
1706
21st to endDay
54%8%16%18%4
1666
November1st to 10thDay
60%7%12%16%4
1488
11th to 20thDay
58%8%17%14%3
1401
21st to endDay
54%9%16%16%4
1326
December1st to 10thDay
54%11%11%17%7%1
1140
11th to 20thDay
56%6%17%17%4
1440
21st to endDay
40%7%15%29%9%1
2248
January1st to 10thNight
57%8%13%16%5%1
2836
11th to 20thNight
55%7%14%18%5%1
2803
21st to endNight
60%8%11%14%7%1
2970
February1st to 10thNight
53%8%12%19%8%
2546
11th to 20thNight
52%7%14%20%8%
2284
21st to endNight
45%9%16%20%9%1
1924
March1st to 10thNight
51%7%17%19%6%
2167
11th to 20thNight
47%7%14%23%8%1
1980
21st to endNight
52%8%14%19%7%
2178
April1st to 10thNight
42%7%16%24%11%1
1678
11th to 20thNight
49%8%11%17%10%3
1601
21st to endNight
48%6%12%22%10%2
1558
May1st to 10thNight
40%7%13%25%15%1
1328
11th to 20thNight
38%5%13%27%17%1
1239
21st to endNight
50%5%12%21%10%2
1358
June1st to 10thNight
49%9%13%18%10%1
1134
11th to 20thNight
53%10%12%18%5%1
1054
21st to endNight
39%13%17%23%6%1
900
July1st to 10thNight
33%11%22%27%6%1
1210
11th to 20thNight
36%13%23%25%3
1218
21st to endNight
29%10%30%29%3
1302
August1st to 10thNight
35%9%25%28%2
1246
11th to 20thNight
35%9%26%24%6%
1547
21st to endNight
38%8%18%32%5%
1782
September1st to 10thNight
38%8%21%24%6%3
1678
11th to 20thNight
38%6%20%27%9%
1927
21st to endNight
33%7%17%30%11%1
1980
October1st to 10thNight
45%7%15%24%10%1
2150
11th to 20thNight
42%6%18%26%7%
2251
21st to endNight
52%7%13%20%7%
2672
November1st to 10thNight
59%6%11%19%5%
2590
11th to 20thNight
60%8%16%12%4
2778
21st to endNight
55%8%17%17%4
2851
December1st to 10thNight
52%7%14%19%7%1
3040
11th to 20thNight
62%8%13%12%5%
3751
21st to endNight
38%7%16%23%14%2
5405

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
5%11%27%37%17%3
180
11th to 20thDay
16%10%24%34%12%3
172
21st to endDay
11%10%36%31%9%4
176
February1st to 10thDay
10%16%34%30%9%1
160
11th to 20thDay
12%12%32%26%16%2
236
21st to endDay
6%13%30%30%14%8%
198
March1st to 10thDay
11%12%37%30%9%1
379
11th to 20thDay
10%12%41%25%8%3
420
21st to endDay
15%12%34%28%10%1
462
April1st to 10thDay
12%14%36%27%8%3
420
11th to 20thDay
17%11%30%25%13%4
412
21st to endDay
16%14%32%26%10%2
482
May1st to 10thDay
13%13%24%29%16%5%
603
11th to 20thDay
12%9%24%30%19%7%
625
21st to endDay
19%425%27%20%4
679
June1st to 10thDay
18%10%28%30%11%3
630
11th to 20thDay
21%8%25%23%17%6%
648
21st to endDay
12%6%20%32%22%7%
806
July1st to 10thDay
13%6%23%33%20%5%
621
11th to 20thDay
13%7%22%32%21%5%
618
21st to endDay
10%6%25%29%22%8%
684
August1st to 10thDay
14%6%18%30%24%8%
626
11th to 20thDay
11%9%26%33%16%4
450
21st to endDay
12%7%25%30%20%5%
495
September1st to 10thDay
17%13%29%25%13%3
450
11th to 20thDay
21%9%26%28%14%2
450
21st to endDay
14%13%31%26%14%2
450
October1st to 10thDay
14%10%31%27%15%3
280
11th to 20thDay
18%12%37%24%9%1
270
21st to endDay
21%14%29%22%11%2
297
November1st to 10thDay
22%10%30%25%11%2
270
11th to 20thDay
12%13%47%18%8%2
213
21st to endDay
10%12%39%24%9%6%
180
December1st to 10thDay
8%8%36%31%13%4
180
11th to 20thDay
8%12%38%31%11%
180
21st to endDay
9%7%28%34%17%5%
198
January1st to 10thNight
11%8%33%35%12%2
950
11th to 20thNight
10%9%33%36%9%2
935
21st to endNight
15%11%35%30%8%2
990
February1st to 10thNight
12%7%28%37%15%2
746
11th to 20thNight
12%5%34%33%15%1
704
21st to endNight
7%5%27%39%20%3
592
March1st to 10thNight
8%7%32%38%14%2
720
11th to 20thNight
13%6%36%31%12%2
720
21st to endNight
12%9%28%35%14%2
792
April1st to 10thNight
11%6%31%34%15%2
562
11th to 20thNight
14%7%31%30%16%2
533
21st to endNight
17%8%28%32%14%1
540
May1st to 10thNight
12%7%24%35%18%3
428
11th to 20thNight
10%6%25%39%16%4
354
21st to endNight
19%320%35%21%2
389
June1st to 10thNight
18%6%20%37%17%1
360
11th to 20thNight
20%6%21%29%21%3
360
21st to endNight
12%320%35%26%4
360
July1st to 10thNight
13%319%38%27%1
350
11th to 20thNight
10%5%18%41%24%2
348
21st to endNight
9%417%41%23%5%
394
August1st to 10thNight
12%215%36%29%6%
358
11th to 20thNight
10%5%21%38%24%2
495
21st to endNight
12%322%38%23%2
594
September1st to 10thNight
17%5%22%31%22%2
540
11th to 20thNight
15%5%21%40%18%1
667
21st to endNight
12%7%27%38%15%1
720
October1st to 10thNight
15%6%30%36%11%2
720
11th to 20thNight
14%5%32%34%12%3
720
21st to endNight
17%10%32%29%10%1
890
November1st to 10thNight
19%6%31%33%8%2
925
11th to 20thNight
14%9%34%29%11%3
950
21st to endNight
11%10%38%30%10%1
950
December1st to 10thNight
13%8%31%32%14%3
950
11th to 20thNight
13%9%32%33%10%2
950
21st to endNight
8%5%31%36%16%3
1045
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