St. Malo Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the St. Malo Provincial Park clear sky chart from 2005-11-05 to 2017-09-18.

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%
16276
12%
46797
8%
16232
42%
16232
21%
32899

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%
900
8%
2685
6%
895
33%
895
13%
2090
January16th to endNight
26%
960
10%
2739
5%
960
31%
960
13%
2175
February1st to 15thNight
40%
876
10%
2321
6%
875
42%
875
20%
1716
February16th to endNight
34%
753
12%
2015
6%
753
38%
753
18%
1539
March1st to 15thNight
32%
624
14%
2064
9%
624
38%
624
18%
1455
March16th to endNight
37%
576
14%
2112
11%
576
44%
576
17%
1417
April1st to 15thNight
41%
539
16%
1723
14%
539
49%
539
24%
1089
April16th to endNight
39%
540
16%
1620
11%
540
44%
540
22%
1105
May1st to 15thNight
34%
540
13%
1515
4%
540
38%
540
25%
1026
May16th to endNight
40%
563
13%
1311
5%
561
43%
561
32%
899
June1st to 15thNight
45%
540
5%
1260
3%
540
48%
540
34%
849
June16th to endNight
54%
540
5%
1260
3%
540
56%
540
34%
846
July1st to 15thNight
62%
510
8%
1190
6%
510
63%
510
47%
723
July16th to endNight
65%
564
16%
1264
9%
531
66%
531
49%
739
August1st to 15thNight
60%
539
18%
1567
10%
536
63%
536
41%
863
August16th to endNight
58%
573
23%
1719
19%
573
64%
573
43%
909
September1st to 15thNight
53%
540
18%
1813
17%
540
60%
540
35%
983
September16th to endNight
45%
501
20%
1848
18%
501
53%
501
27%
1078
October1st to 15thNight
31%
630
16%
1950
10%
630
35%
630
19%
1365
October16th to endNight
33%
833
12%
2241
6%
833
37%
833
22%
1623
November1st to 15thNight
26%
875
12%
2432
5%
875
32%
875
19%
1800
November16th to endNight
25%
900
11%
2568
6%
900
29%
900
14%
2008
December1st to 15thNight
29%
900
6%
2700
5%
900
31%
900
11%
2170
December16th to endNight
20%
960
7%
2880
4%
960
24%
960
9%
2432

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
13%8%36%6%35%5%5%7%33%
48027
Night
11%9%47%6%35%5%5%6%33%
46945
Cloud CoverDay
14%8%36%6%35%5%5%7%33%
48037
Night
12%9%47%6%35%5%5%6%33%
46948
Cloud CoverDay
13%8%36%6%35%5%5%7%33%
48038
Night
11%9%47%6%35%5%5%6%33%
46949
Cloud CoverDay
13%9%36%6%35%5%5%7%33%
48036
Night
11%9%47%6%35%5%5%6%33%
46949
TransparencyDay
49%5%15%22%6%
47692
Night
49%414%22%7%
46797
SeeingDay
16%7%27%28%15%4
6261
Night
16%5%29%33%13%1
16280

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
8%13%5%9%8%5%6%7%7%5%20%
1253
16th to endDay
13%12%7%10%10%6%8%7%6%5%11%
1483
February1st to 15thDay
7%9%5%10%9%5%7%7%6%8%23%
1542
16th to endDay
10%10%410%10%8%7%6%5%7%18%
1468
March1st to 15thDay
12%11%5%10%9%25%45%6%24%
1885
16th to endDay
14%11%47%7%46%45%7%25%
2112
April1st to 15thDay
12%9%46%6%2445%5%37%
2222
16th to endDay
17%8%36%5%2345%6%33%
2340
May1st to 15thDay
20%9%35%424445%32%
2434
16th to endDay
19%7%3442445%8%35%
2802
June1st to 15thDay
18%6%36%6%35%5%5%8%32%
2700
16th to endDay
15%6%25%5%35%5%6%8%35%
2700
July1st to 15thDay
11%3245%346%6%9%43%
2700
16th to endDay
8%4245%2445%9%49%
2817
August1st to 15thDay
11%5%135%25%5%6%8%42%
2385
16th to endDay
11%31442345%6%51%
2483
September1st to 15thDay
12%5%2443445%7%46%
2143
16th to endDay
16%4243235%5%8%42%
1837
October1st to 15thDay
16%11%37%6%33345%33%
1668
16th to endDay
18%10%36%6%3445%6%29%
1631
November1st to 15thDay
13%13%48%5%23445%31%
1426
16th to endDay
14%13%7%8%9%35%445%21%
1392
December1st to 15thDay
9%16%6%12%9%5%7%7%5%6%15%
1260
16th to endDay
13%15%8%13%9%45%46%414%
1344
January1st to 15thNight
7%14%7%9%9%47%6%6%6%20%
2685
16th to endNight
10%13%6%11%8%47%7%6%5%18%
2739
February1st to 15thNight
8%9%5%8%8%47%7%7%7%26%
2318
16th to endNight
9%10%5%10%8%46%5%5%6%26%
2015
March1st to 15thNight
11%11%5%8%6%3435%6%31%
2052
16th to endNight
13%9%37%5%35%5%5%7%32%
2112
April1st to 15thNight
10%7%35%5%35%6%5%7%39%
1723
16th to endNight
15%8%35%6%35%445%37%
1620
May1st to 15thNight
18%7%35%5%23337%37%
1515
16th to endNight
14%7%25%32345%8%41%
1310
June1st to 15thNight
14%324425%45%8%44%
1260
16th to endNight
9%4246%35%5%6%10%41%
1260
July1st to 15thNight
7%31323345%8%55%
1260
16th to endNight
6%31222447%8%55%
1350
August1st to 15thNight
8%32431445%7%53%
1575
16th to endNight
7%313323447%57%
1719
September1st to 15thNight
8%3143235%5%7%52%
1813
16th to endNight
15%4233335%5%6%45%
1848
October1st to 15thNight
17%9%26%6%35%5%5%6%32%
1950
16th to endNight
17%10%46%5%2445%6%33%
2241
November1st to 15thNight
15%13%5%7%42445%5%30%
2432
16th to endNight
13%12%6%9%8%45%446%25%
2568
December1st to 15thNight
8%16%7%11%10%46%5%5%6%17%
2700
16th to endNight
15%15%7%13%10%45%44413%
2880

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
8%13%5%9%8%5%6%7%7%5%21%
1254
16th to endDay
13%12%7%10%10%5%9%7%6%5%11%
1483
February1st to 15thDay
7%9%5%10%9%48%7%5%7%23%
1542
16th to endDay
11%9%410%10%7%7%6%5%7%18%
1468
March1st to 15thDay
13%11%6%10%8%35%5%5%6%24%
1896
16th to endDay
13%12%47%7%46%46%6%25%
2110
April1st to 15thDay
12%10%46%6%2445%5%37%
2222
16th to endDay
17%8%36%5%2445%7%33%
2340
May1st to 15thDay
20%10%35%424445%32%
2434
16th to endDay
19%7%3442445%8%35%
2802
June1st to 15thDay
18%6%26%6%35%5%5%7%32%
2700
16th to endDay
15%5%25%5%35%5%6%8%35%
2700
July1st to 15thDay
11%3245%347%6%8%43%
2700
16th to endDay
8%42442445%8%49%
2817
August1st to 15thDay
11%5%14435%5%6%8%43%
2385
16th to endDay
11%324423446%52%
2483
September1st to 15thDay
12%5%2442445%7%46%
2143
16th to endDay
16%41432345%8%43%
1837
October1st to 15thDay
16%11%37%6%3335%6%33%
1668
16th to endDay
18%10%36%6%34446%30%
1631
November1st to 15thDay
13%13%5%8%5%2345%5%32%
1426
16th to endDay
15%13%7%8%8%36%5%45%22%
1392
December1st to 15thDay
9%16%6%11%9%5%7%7%5%5%15%
1260
16th to endDay
13%15%8%13%9%45%46%414%
1344
January1st to 15thNight
7%14%7%9%8%5%7%6%6%6%20%
2685
16th to endNight
10%13%6%11%8%47%6%6%5%18%
2739
February1st to 15thNight
8%9%5%8%8%47%7%6%6%26%
2311
16th to endNight
9%10%5%10%9%46%6%5%6%26%
2015
March1st to 15thNight
10%12%5%8%6%3435%6%32%
2064
16th to endNight
14%9%37%5%345%5%7%32%
2110
April1st to 15thNight
10%7%345%35%5%5%7%39%
1723
16th to endNight
14%8%35%6%36%44437%
1620
May1st to 15thNight
19%7%35%5%23337%37%
1514
16th to endNight
14%7%25%32345%7%42%
1311
June1st to 15thNight
14%324425%45%8%44%
1260
16th to endNight
9%4246%45%5%6%10%40%
1260
July1st to 15thNight
7%21333346%7%55%
1260
16th to endNight
6%21222446%9%55%
1350
August1st to 15thNight
8%31431445%8%53%
1575
16th to endNight
7%313323448%57%
1719
September1st to 15thNight
9%3143335%5%7%52%
1813
16th to endNight
15%42333345%6%45%
1848
October1st to 15thNight
17%8%26%6%345%46%32%
1950
16th to endNight
17%10%36%5%2445%6%33%
2241
November1st to 15thNight
15%13%6%6%43445%5%30%
2432
16th to endNight
13%12%6%10%8%4445%5%25%
2568
December1st to 15thNight
9%16%6%11%10%46%5%5%6%17%
2700
16th to endNight
15%16%7%13%10%4444414%
2880

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
7%13%6%9%8%6%6%7%8%5%20%
1253
16th to endDay
12%13%6%10%10%6%8%7%6%5%11%
1483
February1st to 15thDay
7%9%5%10%8%5%8%7%6%7%22%
1542
16th to endDay
10%10%5%10%10%6%8%6%5%8%17%
1468
March1st to 15thDay
12%11%5%10%9%25%5%47%23%
1896
16th to endDay
13%12%48%8%45%5%5%7%24%
2112
April1st to 15thDay
11%10%36%6%3445%6%36%
2222
16th to endDay
17%8%46%42445%6%33%
2340
May1st to 15thDay
19%10%45%5%24445%32%
2434
16th to endDay
18%8%2442446%7%35%
2802
June1st to 15thDay
16%7%36%6%36%45%7%31%
2700
16th to endDay
14%6%26%5%35%5%6%8%34%
2700
July1st to 15thDay
10%414435%6%7%8%42%
2700
16th to endDay
7%3235%345%6%8%48%
2817
August1st to 15thDay
10%5%235%346%6%8%42%
2385
16th to endDay
10%41442445%6%51%
2483
September1st to 15thDay
11%6%2443435%7%46%
2143
16th to endDay
16%42442445%9%42%
1837
October1st to 15thDay
16%11%37%6%43346%32%
1668
16th to endDay
18%10%46%6%345%5%6%29%
1631
November1st to 15thDay
13%13%6%8%5%3345%5%30%
1426
16th to endDay
14%14%7%9%8%5%45%45%21%
1392
December1st to 15thDay
9%15%7%12%9%5%8%6%5%6%14%
1260
16th to endDay
12%15%8%13%10%35%45%414%
1344
January1st to 15thNight
7%14%7%9%8%5%7%6%6%6%19%
2685
16th to endNight
9%13%6%11%7%46%7%6%5%18%
2739
February1st to 15thNight
8%9%48%7%5%7%8%6%7%25%
2311
16th to endNight
9%10%6%10%8%46%6%5%6%26%
2015
March1st to 15thNight
11%11%5%9%5%4435%6%31%
2064
16th to endNight
13%9%47%5%346%5%7%32%
2112
April1st to 15thNight
9%7%45%5%35%6%47%39%
1723
16th to endNight
13%9%36%5%35%45%5%37%
1620
May1st to 15thNight
18%8%46%423338%36%
1514
16th to endNight
14%7%3442345%8%40%
1310
June1st to 15thNight
13%42343445%8%43%
1260
16th to endNight
9%5%25%5%36%46%10%40%
1260
July1st to 15thNight
7%31332346%8%54%
1260
16th to endNight
5%3133245%6%8%54%
1350
August1st to 15thNight
8%415%41345%8%53%
1575
16th to endNight
7%314323348%57%
1719
September1st to 15thNight
8%4143245%5%7%52%
1813
16th to endNight
14%5%243336%5%7%44%
1848
October1st to 15thNight
16%9%36%5%345%5%6%31%
1950
16th to endNight
16%10%46%5%2445%6%32%
2241
November1st to 15thNight
15%13%6%7%5%2445%5%30%
2432
16th to endNight
12%12%7%9%8%45%446%24%
2568
December1st to 15thNight
8%16%6%10%11%5%6%5%5%6%17%
2700
16th to endNight
14%16%7%13%10%5%5%44413%
2880

Percentage Cloud Cover SE (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
8%12%6%10%8%6%6%7%7%5%21%
1253
16th to endDay
13%12%6%11%10%6%8%8%6%411%
1483
February1st to 15thDay
6%10%5%10%7%6%8%6%7%7%22%
1542
16th to endDay
10%10%411%9%6%8%6%5%7%17%
1468
March1st to 15thDay
12%12%5%9%9%35%5%5%6%23%
1896
16th to endDay
13%11%47%8%45%45%7%25%
2110
April1st to 15thDay
12%9%46%5%25%446%36%
2222
16th to endDay
16%9%36%42445%6%33%
2340
May1st to 15thDay
20%10%36%5%24445%32%
2434
16th to endDay
19%7%2442445%7%35%
2802
June1st to 15thDay
17%7%36%6%35%448%31%
2700
16th to endDay
14%7%26%5%35%5%5%8%34%
2700
July1st to 15thDay
11%3145%35%5%7%8%43%
2700
16th to endDay
7%4135%345%6%8%48%
2817
August1st to 15thDay
10%5%234345%6%8%43%
2385
16th to endDay
11%42442345%7%51%
2483
September1st to 15thDay
11%6%25%424447%46%
2143
16th to endDay
16%5%1442445%8%42%
1837
October1st to 15thDay
16%11%47%6%34346%32%
1668
16th to endDay
18%10%45%6%35%45%7%28%
1631
November1st to 15thDay
12%14%5%8%5%33446%30%
1426
16th to endDay
13%14%7%9%8%45%45%420%
1392
December1st to 15thDay
8%16%6%13%8%5%7%7%5%6%14%
1260
16th to endDay
13%15%8%13%10%3446%5%14%
1344
January1st to 15thNight
7%13%7%10%9%47%7%6%6%19%
2685
16th to endNight
10%13%7%11%7%46%7%7%5%18%
2739
February1st to 15thNight
8%9%48%7%48%8%7%6%25%
2311
16th to endNight
9%9%6%11%7%46%6%5%6%26%
2015
March1st to 15thNight
10%12%5%8%6%34347%31%
2064
16th to endNight
13%10%37%5%346%5%6%33%
2112
April1st to 15thNight
10%8%35%5%26%45%6%39%
1723
16th to endNight
14%8%37%5%345%45%37%
1620
May1st to 15thNight
18%8%36%433347%36%
1514
16th to endNight
15%5%35%423448%41%
1310
June1st to 15thNight
14%5%235%25%448%44%
1260
16th to endNight
10%5%345%35%46%10%40%
1260
July1st to 15thNight
7%3133145%5%8%54%
1260
16th to endNight
5%3123245%6%9%54%
1350
August1st to 15thNight
8%3243135%5%8%53%
1575
16th to endNight
8%313323438%57%
1719
September1st to 15thNight
8%41432446%6%52%
1813
16th to endNight
14%4234345%5%7%44%
1848
October1st to 15thNight
17%9%36%5%35%5%5%6%31%
1950
16th to endNight
16%10%36%5%335%5%6%32%
2241
November1st to 15thNight
14%13%6%7%424445%29%
2432
16th to endNight
12%12%7%9%8%35%446%24%
2568
December1st to 15thNight
9%15%7%10%11%46%5%5%6%17%
2700
16th to endNight
15%15%7%13%9%46%445%12%
2880

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
59%5%14%16%4
1254
16th to endDay
70%48%12%2
1483
February1st to 15thDay
56%5%16%15%6%
1543
16th to endDay
62%411%16%4
1468
March1st to 15thDay
59%5%14%15%4
1896
16th to endDay
57%415%16%5%
2112
April1st to 15thDay
48%313%25%8%
2222
16th to endDay
49%314%20%9%2
2340
May1st to 15thDay
53%39%24%7%
2434
16th to endDay
46%412%23%10%1
2806
June1st to 15thDay
50%414%22%7%
2700
16th to endDay
45%6%19%23%4
2700
July1st to 15thDay
34%6%18%32%8%
2541
16th to endDay
32%5%20%29%10%
2640
August1st to 15thDay
36%6%18%29%6%
2369
16th to endDay
32%417%34%10%
2483
September1st to 15thDay
37%419%29%8%
2143
16th to endDay
39%5%18%31%5%
1837
October1st to 15thDay
52%314%22%5%
1668
16th to endDay
54%5%18%17%4
1631
November1st to 15thDay
54%417%18%41
1426
16th to endDay
64%5%13%13%3
1392
December1st to 15thDay
67%6%13%10%1
1260
16th to endDay
71%39%10%4
1344
January1st to 15thNight
61%5%10%17%4
2685
16th to endNight
62%5%11%16%3
2739
February1st to 15thNight
53%418%16%7%
2321
16th to endNight
56%414%18%5%
2015
March1st to 15thNight
52%413%21%7%
2064
16th to endNight
49%5%15%21%7%
2112
April1st to 15thNight
42%312%22%15%2
1723
16th to endNight
48%310%24%11%1
1620
May1st to 15thNight
47%212%25%12%
1515
16th to endNight
40%413%23%15%1
1311
June1st to 15thNight
37%5%17%27%10%1
1260
16th to endNight
37%6%22%25%7%1
1260
July1st to 15thNight
26%5%18%36%12%1
1190
16th to endNight
24%417%35%15%1
1264
August1st to 15thNight
27%419%36%10%1
1567
16th to endNight
26%218%35%15%1
1719
September1st to 15thNight
30%415%35%12%1
1813
16th to endNight
37%417%28%11%
1848
October1st to 15thNight
51%416%20%7%
1950
16th to endNight
51%416%24%2
2241
November1st to 15thNight
55%315%18%5%1
2432
16th to endNight
60%5%13%15%4
2568
December1st to 15thNight
66%414%12%2
2700
16th to endNight
72%39%11%2
2880

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
12%7%23%34%21%1
90
16th to endDay
18%127%38%14%
96
February1st to 15thDay
12%12%44%23%7%
90
16th to endDay
19%243%29%4
81
March1st to 15thDay
15%7%30%36%8%1
90
16th to endDay
23%9%25%20%15%5%
96
April1st to 15thDay
15%12%36%26%9%
341
16th to endDay
21%9%28%26%12%2
450
May1st to 15thDay
22%11%28%24%10%2
468
16th to endDay
21%7%27%25%14%3
517
June1st to 15thDay
17%8%28%26%13%5%
495
16th to endDay
14%8%26%29%14%5%
495
July1st to 15thDay
14%324%28%22%6%
475
16th to endDay
7%6%25%31%20%8%
515
August1st to 15thDay
10%323%30%21%10%
493
16th to endDay
10%6%25%31%20%4
523
September1st to 15thDay
10%5%31%32%17%2
298
16th to endDay
18%7%38%19%11%4
96
October1st to 15thDay
25%6%22%32%12%1
90
16th to endDay
31%130%22%12%2
96
November1st to 15thDay
20%6%25%32%13%2
90
16th to endDay
35%10%26%20%7%
90
December1st to 15thDay
15%6%26%35%14%1
90
16th to endDay
18%7%32%27%9%5%
96
January1st to 15thNight
13%6%33%31%14%1
900
16th to endNight
16%7%35%32%7%
960
February1st to 15thNight
12%6%24%37%17%2
880
16th to endNight
13%5%31%32%13%3
753
March1st to 15thNight
15%6%32%29%14%1
624
16th to endNight
18%7%26%29%14%4
576
April1st to 15thNight
12%7%33%34%11%
539
16th to endNight
18%5%29%34%11%
540
May1st to 15thNight
22%7%29%29%10%
540
16th to endNight
17%6%29%32%12%
563
June1st to 15thNight
17%425%35%16%
540
16th to endNight
10%422%41%18%1
540
July1st to 15thNight
9%319%43%22%
510
16th to endNight
6%220%46%21%2
564
August1st to 15thNight
10%320%41%21%3
539
16th to endNight
9%424%36%23%1
573
September1st to 15thNight
10%227%37%19%2
540
16th to endNight
16%329%37%11%
501
October1st to 15thNight
23%5%32%30%8%
630
16th to endNight
21%6%29%30%10%1
833
November1st to 15thNight
22%7%34%24%9%1
875
16th to endNight
18%9%36%26%7%1
900
December1st to 15thNight
15%5%29%35%12%1
900
16th to endNight
21%6%31%27%10%2
960
Page generated at 2017-09-19 06:32:24. Version ac04

Copyright 2017 A. Danko


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