Lake St. Peter Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake St. Peter Provincial Park clear sky chart from 2005-11-06 to 2024-01-13.

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
25%
22595
13%
74678
7%
22553
33%
22553
14%
54315

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
11%
760
8%
2649
2%
757
19%
757
6%
2167
January11th to 20thNight
13%
729
9%
2549
4%
729
20%
729
6%
2075
January21st to endNight
19%
792
12%
2588
6%
792
26%
792
10%
2002
February1st to 10thNight
10%
720
8%
2340
2%
720
17%
720
8%
1883
February11th to 20thNight
13%
702
14%
2275
4%
700
27%
700
11%
1695
February21st to endNight
16%
592
14%
1866
5%
592
28%
592
11%
1416
March1st to 10thNight
15%
720
16%
2042
6%
720
24%
720
14%
1519
March11th to 20thNight
19%
720
16%
1980
6%
720
29%
720
16%
1451
March21st to endNight
23%
792
19%
2146
7%
792
33%
792
20%
1485
April1st to 10thNight
16%
720
14%
1800
4%
720
22%
720
17%
1373
April11th to 20thNight
24%
705
18%
1769
6%
705
30%
705
21%
1278
April21st to endNight
29%
540
16%
1620
8%
540
35%
540
17%
1182
May1st to 10thNight
34%
419
18%
1499
13%
419
42%
419
18%
960
May11th to 20thNight
31%
354
21%
1416
14%
354
48%
354
20%
856
May21st to endNight
35%
389
15%
1551
11%
388
48%
388
24%
883
June1st to 10thNight
30%
360
11%
1440
9%
360
42%
360
18%
927
June11th to 20thNight
41%
360
13%
1440
15%
360
50%
360
22%
858
June21st to endNight
39%
360
11%
1322
10%
360
47%
360
19%
856
July1st to 10thNight
45%
350
14%
1400
17%
350
54%
350
25%
796
July11th to 20thNight
44%
348
16%
1392
19%
348
52%
348
22%
813
July21st to endNight
43%
394
16%
1486
14%
372
52%
372
25%
835
August1st to 10thNight
49%
529
15%
1593
10%
527
53%
527
30%
975
August11th to 20thNight
54%
534
19%
1598
11%
534
60%
534
32%
996
August21st to endNight
43%
706
17%
1894
8%
706
48%
706
30%
1242
September1st to 10thNight
44%
720
17%
1800
7%
720
48%
720
32%
1167
September11th to 20thNight
43%
720
22%
1807
12%
720
47%
720
32%
1185
September21st to endNight
41%
720
20%
2074
15%
720
46%
720
23%
1411
October1st to 10thNight
29%
720
16%
2160
11%
720
37%
720
19%
1504
October11th to 20thNight
20%
720
11%
2160
5%
720
28%
720
14%
1638
October21st to endNight
19%
792
13%
2416
5%
792
28%
792
11%
1901
November1st to 10thNight
25%
740
15%
2515
11%
740
33%
740
14%
1798
November11th to 20thNight
17%
760
13%
2660
8%
760
26%
760
11%
2013
November21st to endNight
17%
760
9%
2660
5%
760
22%
760
8%
2160
December1st to 10thNight
10%
760
7%
2660
2%
760
17%
760
6%
2257
December11th to 20thNight
12%
760
10%
3260
4%
759
21%
759
6%
2589
December21st to endNight
9%
828
5%
4851
1%
817
15%
817
3%
4169

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
17%12%5%8%6%35%45%6%30%
74763
Night
16%12%5%8%6%35%45%6%30%
74910
TransparencyDay
55%6%9%19%10%1
74468
Night
55%5%10%19%10%1
74739
SeeingDay
24%18%31%18%7%2
13312
Night
22%16%31%22%8%1
22604

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 10thDay
13%19%8%13%9%34345%19%
1517
11th to 20thDay
17%16%8%11%7%4444421%
1456
21st to endDay
12%14%7%14%8%5%6%445%21%
1768
February1st to 10thDay
11%17%7%13%11%45%445%18%
1620
11th to 20thDay
12%15%7%12%8%45%445%26%
1573
21st to endDay
16%16%6%9%8%46%445%22%
1390
March1st to 10thDay
13%15%5%9%9%45%5%45%26%
1913
11th to 20thDay
12%14%6%11%9%45%45%427%
1980
21st to endDay
17%12%5%7%5%24345%35%
2209
April1st to 10thDay
20%13%47%7%3445%6%27%
2160
11th to 20thDay
21%12%45%434345%35%
2156
21st to endDay
22%11%48%5%34345%33%
2340
May1st to 10thDay
17%9%47%6%35%5%46%34%
2459
11th to 20thDay
18%9%46%6%3345%6%36%
2478
21st to endDay
14%6%46%6%36%5%5%8%38%
2725
June1st to 10thDay
21%9%46%6%35%5%5%7%31%
2520
11th to 20thDay
16%6%35%5%35%6%6%9%35%
2520
21st to endDay
16%8%36%6%45%6%6%8%33%
2583
July1st to 10thDay
13%6%35%6%35%5%7%9%38%
2520
11th to 20thDay
13%6%36%6%46%5%6%8%37%
2520
21st to endDay
12%6%46%6%46%6%7%9%34%
2744
August1st to 10thDay
13%7%37%7%5%7%6%6%7%32%
2332
11th to 20thDay
14%6%37%6%46%5%6%8%35%
2303
21st to endDay
14%8%35%5%46%6%6%8%34%
2444
September1st to 10thDay
16%7%35%5%35%5%6%8%38%
2160
11th to 20thDay
15%8%25%5%345%5%7%41%
2152
21st to endDay
18%8%46%5%445%6%6%34%
1885
October1st to 10thDay
20%11%37%5%34446%32%
1800
11th to 20thDay
24%14%5%8%6%35%445%22%
1800
21st to endDay
27%15%6%8%6%34345%19%
1938
November1st to 10thDay
16%13%47%6%345%5%7%30%
1560
11th to 20thDay
16%17%7%10%7%345%5%6%22%
1520
21st to endDay
20%20%7%10%7%34436%15%
1520
December1st to 10thDay
18%22%8%11%7%3434414%
1520
11th to 20thDay
16%19%9%12%6%3444419%
1906
21st to endDay
22%23%8%12%7%2122416%
2772
January1st to 10thNight
17%14%7%13%9%45%45%5%16%
2649
11th to 20thNight
14%18%7%12%9%46%445%18%
2549
21st to endNight
12%14%6%11%9%46%5%5%6%23%
2588
February1st to 10thNight
12%16%7%12%9%46%5%46%18%
2340
11th to 20thNight
12%13%7%11%6%46%5%46%27%
2273
21st to endNight
12%17%6%9%7%45%45%6%25%
1866
March1st to 10thNight
13%11%5%9%8%5%5%33433%
2032
11th to 20thNight
12%14%6%8%6%445%5%6%32%
1979
21st to endNight
12%12%47%5%345%5%6%38%
2146
April1st to 10thNight
19%12%5%8%6%3445%5%31%
1800
11th to 20thNight
18%10%46%6%2345%5%38%
1769
21st to endNight
18%11%47%5%45%445%31%
1620
May1st to 10thNight
19%7%26%5%2445%6%39%
1499
11th to 20thNight
16%7%35%42446%8%40%
1415
21st to endNight
12%5%35%5%345%5%10%45%
1550
June1st to 10thNight
17%7%36%6%345%5%9%35%
1440
11th to 20thNight
12%6%35%5%345%5%8%44%
1440
21st to endNight
15%6%47%6%35%5%5%7%37%
1322
July1st to 10thNight
9%5%25%6%35%5%5%7%47%
1440
11th to 20thNight
12%6%35%5%345%6%8%43%
1440
21st to endNight
10%5%25%5%35%5%6%9%45%
1574
August1st to 10thNight
10%5%35%6%25%5%6%8%47%
1603
11th to 20thNight
9%7%25%435%5%6%8%46%
1598
21st to endNight
12%6%26%5%345%6%8%44%
1894
September1st to 10thNight
12%5%25%4346%6%8%46%
1800
11th to 20thNight
14%6%25%5%2445%7%47%
1807
21st to endNight
17%8%35%4345%46%41%
2074
October1st to 10thNight
20%10%35%5%3345%6%37%
2160
11th to 20thNight
21%13%37%7%3445%6%27%
2160
21st to endNight
23%15%5%7%6%4435%5%23%
2416
November1st to 10thNight
16%12%5%7%6%45%45%6%30%
2515
11th to 20thNight
17%13%5%8%7%46%5%5%5%25%
2660
21st to endNight
19%16%6%10%8%46%446%19%
2660
December1st to 10thNight
18%20%9%11%7%44445%13%
2660
11th to 20thNight
15%19%8%12%7%33345%20%
3288
21st to endNight
24%21%8%11%9%3433412%
4884

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
69%48%13%6%
1518
11th to 20thDay
68%47%10%10%2
1456
21st to endDay
66%46%10%11%3
1768
February1st to 10thDay
69%5%5%14%5%1
1620
11th to 20thDay
62%410%13%10%2
1582
21st to endDay
65%28%13%11%1
1390
March1st to 10thDay
60%411%14%9%2
1916
11th to 20thDay
60%49%15%9%2
1980
21st to endDay
53%37%18%14%5%
2209
April1st to 10thDay
59%47%17%11%3
2160
11th to 20thDay
53%46%23%14%1
2156
21st to endDay
55%47%18%13%3
2340
May1st to 10thDay
51%5%8%19%14%3
2459
11th to 20thDay
50%5%6%23%14%2
2482
21st to endDay
45%7%12%20%14%3
2725
June1st to 10thDay
53%6%9%21%11%1
2520
11th to 20thDay
44%7%10%23%13%2
2520
21st to endDay
48%8%11%20%11%1
2583
July1st to 10thDay
41%6%11%28%12%2
2450
11th to 20thDay
43%7%12%26%11%
2445
21st to endDay
45%9%12%25%9%
2591
August1st to 10thDay
48%7%14%21%9%1
2318
11th to 20thDay
46%8%14%24%8%1
2303
21st to endDay
45%9%13%23%10%1
2444
September1st to 10thDay
42%7%12%26%12%1
2160
11th to 20thDay
42%6%10%29%12%1
2152
21st to endDay
49%7%11%24%9%
1885
October1st to 10thDay
53%6%10%19%12%1
1800
11th to 20thDay
65%5%10%13%6%1
1800
21st to endDay
67%5%8%13%6%1
1938
November1st to 10thDay
54%6%14%19%7%1
1560
11th to 20thDay
63%5%11%12%7%1
1520
21st to endDay
71%6%7%10%5%1
1520
December1st to 10thDay
75%46%9%5%1
1520
11th to 20thDay
67%7%6%10%8%1
1906
21st to endDay
76%25%13%5%
2772
January1st to 10thNight
71%5%8%11%6%
2649
11th to 20thNight
69%5%5%11%8%2
2549
21st to endNight
62%5%7%13%12%1
2588
February1st to 10thNight
67%5%8%11%8%1
2340
11th to 20thNight
59%5%8%18%9%1
2275
21st to endNight
60%47%18%9%1
1866
March1st to 10thNight
57%39%16%12%2
2042
11th to 20thNight
54%410%19%11%2
1980
21st to endNight
48%48%21%16%3
2146
April1st to 10thNight
57%47%18%13%2
1800
11th to 20thNight
50%47%23%15%1
1769
21st to endNight
54%5%7%17%14%2
1620
May1st to 10thNight
45%5%10%20%17%3
1499
11th to 20thNight
42%5%10%25%16%2
1416
21st to endNight
36%6%15%22%18%3
1551
June1st to 10thNight
46%6%11%23%13%1
1440
11th to 20thNight
38%8%11%27%16%1
1440
21st to endNight
45%6%15%20%12%1
1322
July1st to 10thNight
34%8%13%24%20%1
1400
11th to 20thNight
38%7%12%29%14%
1392
21st to endNight
34%7%16%31%12%1
1486
August1st to 10thNight
35%6%19%26%13%1
1593
11th to 20thNight
34%7%17%29%11%1
1598
21st to endNight
38%7%16%28%10%1
1894
September1st to 10thNight
34%9%15%28%13%1
1800
11th to 20thNight
38%6%13%32%11%1
1807
21st to endNight
45%6%11%29%10%
2074
October1st to 10thNight
49%5%11%21%14%
2160
11th to 20thNight
58%5%12%17%7%
2160
21st to endNight
63%6%9%13%9%1
2416
November1st to 10thNight
53%6%12%20%8%1
2515
11th to 20thNight
59%7%10%16%7%1
2660
21st to endNight
67%6%9%12%5%
2660
December1st to 10thNight
73%6%7%10%4
2660
11th to 20thNight
67%5%6%14%7%1
3288
21st to endNight
78%349%4
4884

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
26%23%34%13%21
180
11th to 20thDay
32%16%33%13%41
164
21st to endDay
26%22%33%16%5%
258
February1st to 10thDay
31%31%30%7%1
240
11th to 20thDay
26%33%34%6%
240
21st to endDay
34%25%33%8%1
256
March1st to 10thDay
25%22%37%13%2
420
11th to 20thDay
28%20%33%14%41
420
21st to endDay
33%21%27%14%5%1
462
April1st to 10thDay
28%24%31%12%5%
420
11th to 20thDay
36%20%22%12%8%2
412
21st to endDay
31%17%33%13%5%1
420
May1st to 10thDay
27%18%30%17%5%3
423
11th to 20thDay
22%19%32%17%8%2
447
21st to endDay
19%20%32%19%8%3
485
June1st to 10thDay
25%15%36%19%6%
450
11th to 20thDay
18%16%31%21%10%3
450
21st to endDay
19%16%33%22%9%2
513
July1st to 10thDay
13%10%33%33%9%2
445
11th to 20thDay
17%13%31%23%13%3
444
21st to endDay
14%13%37%26%9%2
488
August1st to 10thDay
16%10%35%24%11%4
446
11th to 20thDay
16%8%28%29%15%4
439
21st to endDay
18%11%31%23%12%5%
495
September1st to 10thDay
16%13%33%20%12%6%
450
11th to 20thDay
18%12%27%21%15%7%
450
21st to endDay
21%15%26%22%10%5%
450
October1st to 10thDay
25%20%24%16%12%4
450
11th to 20thDay
30%25%27%14%41
450
21st to endDay
37%19%28%13%3
473
November1st to 10thDay
28%21%30%15%5%1
254
11th to 20thDay
32%21%31%12%4
180
21st to endDay
33%24%31%9%21
180
December1st to 10thDay
34%19%31%13%2
180
11th to 20thDay
36%25%27%11%11
180
21st to endDay
34%26%26%10%31
198
January1st to 10thNight
26%21%33%15%31
760
11th to 20thNight
27%19%31%17%5%1
729
21st to endNight
18%18%33%22%7%1
792
February1st to 10thNight
23%23%38%15%2
720
11th to 20thNight
20%21%41%15%3
703
21st to endNight
24%24%30%18%3
592
March1st to 10thNight
22%24%33%17%3
720
11th to 20thNight
21%21%35%17%5%1
720
21st to endNight
19%18%34%22%7%
792
April1st to 10thNight
27%17%32%18%5%
720
11th to 20thNight
25%20%26%20%8%
705
21st to endNight
24%14%28%23%10%1
540
May1st to 10thNight
23%11%26%29%10%1
419
11th to 20thNight
20%11%34%29%6%
354
21st to endNight
15%12%34%28%11%
389
June1st to 10thNight
18%9%36%29%7%1
360
11th to 20thNight
18%9%28%33%12%
360
21st to endNight
18%11%27%31%13%
360
July1st to 10thNight
9%8%32%33%17%1
350
11th to 20thNight
14%7%29%33%16%1
348
21st to endNight
10%6%36%36%11%1
394
August1st to 10thNight
12%6%24%35%22%2
529
11th to 20thNight
9%6%22%37%23%2
534
21st to endNight
14%8%29%30%17%2
706
September1st to 10thNight
14%8%29%29%18%2
720
11th to 20thNight
19%8%25%28%17%4
720
21st to endNight
21%12%22%27%16%3
720
October1st to 10thNight
26%14%27%21%10%2
720
11th to 20thNight
27%17%30%18%7%1
720
21st to endNight
33%16%26%20%4
792
November1st to 10thNight
26%16%29%22%6%
740
11th to 20thNight
25%21%32%14%8%1
760
21st to endNight
31%18%28%18%41
760
December1st to 10thNight
30%20%33%13%4
760
11th to 20thNight
26%22%33%15%31
760
21st to endNight
33%19%31%14%3
836
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