Mactaquac Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mactaquac Provincial Park clear sky chart from 2005-11-06 to 2024-01-27.

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
23%
23216
15%
75006
6%
23161
34%
23161
15%
52320

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
14%
850
12%
2838
2%
847
25%
847
9%
2075
January11th to 20thNight
16%
765
12%
2670
3%
765
27%
765
8%
1982
January21st to endNight
16%
820
17%
2773
4%
820
31%
820
14%
1838
February1st to 10thNight
16%
720
15%
2340
4%
720
29%
720
13%
1630
February11th to 20thNight
13%
703
12%
2276
1%
700
26%
700
10%
1657
February21st to endNight
18%
592
16%
1798
4%
592
33%
592
14%
1292
March1st to 10thNight
15%
720
19%
2084
6%
720
29%
720
15%
1520
March11th to 20thNight
19%
720
16%
1980
5%
720
28%
720
16%
1422
March21st to endNight
19%
792
17%
2178
4%
792
30%
792
17%
1577
April1st to 10thNight
15%
652
13%
1840
3%
652
23%
652
13%
1384
April11th to 20thNight
18%
534
18%
1598
6%
534
29%
534
17%
1100
April21st to endNight
20%
540
14%
1620
5%
540
28%
540
15%
1177
May1st to 10thNight
24%
540
14%
1620
6%
540
33%
540
17%
1148
May11th to 20thNight
18%
532
16%
1486
5%
532
29%
532
17%
1084
May21st to endNight
25%
482
12%
1450
5%
481
34%
481
17%
1034
June1st to 10thNight
28%
360
9%
1260
5%
360
35%
360
14%
915
June11th to 20thNight
33%
360
13%
1260
10%
360
40%
360
18%
844
June21st to endNight
33%
360
9%
1260
8%
360
36%
360
15%
880
July1st to 10thNight
32%
350
12%
1225
7%
350
43%
350
21%
806
July11th to 20thNight
43%
348
12%
1235
12%
348
49%
348
22%
799
July21st to endNight
38%
468
11%
1556
11%
442
43%
442
17%
1067
August1st to 10thNight
44%
538
11%
1600
8%
534
46%
534
24%
1058
August11th to 20thNight
39%
532
14%
1596
8%
532
44%
532
20%
1102
August21st to endNight
42%
594
20%
1782
10%
594
48%
594
28%
1100
September1st to 10thNight
34%
589
18%
1817
8%
589
44%
589
26%
1130
September11th to 20thNight
39%
720
20%
1980
12%
720
47%
720
28%
1266
September21st to endNight
34%
720
23%
1980
11%
720
44%
720
26%
1293
October1st to 10thNight
34%
720
21%
2111
11%
720
42%
720
25%
1359
October11th to 20thNight
29%
720
20%
2160
7%
720
41%
720
19%
1477
October21st to endNight
20%
792
15%
2510
4%
792
32%
792
13%
1816
November1st to 10thNight
25%
760
16%
2449
7%
760
35%
760
16%
1674
November11th to 20thNight
22%
850
19%
2660
7%
850
36%
850
15%
1835
November21st to endNight
20%
850
13%
2660
4%
850
30%
850
12%
1930
December1st to 10thNight
14%
850
14%
2712
3%
850
26%
850
11%
2027
December11th to 20thNight
14%
850
13%
3479
4%
849
27%
849
9%
2543
December21st to endNight
12%
923
10%
5163
2%
906
25%
906
5%
3479

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
20%9%36%5%35%45%6%34%
74744
Night
20%9%36%5%3445%6%34%
75297
TransparencyDay
51%5%11%20%11%1
74444
Night
51%5%11%20%11%1
75132
SeeingDay
29%16%30%18%7%1
15124
Night
26%14%30%23%6%
23228

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
16%13%6%10%6%4445%6%27%
1327
11th to 20thDay
21%13%5%9%7%24345%29%
1505
21st to endDay
13%10%47%6%445%46%38%
1726
February1st to 10thDay
16%10%47%7%5%5%5%47%30%
1620
11th to 20thDay
17%12%48%6%46%5%45%28%
1573
21st to endDay
11%13%48%6%35%45%6%34%
1456
March1st to 10thDay
18%13%47%6%34445%30%
1872
11th to 20thDay
16%11%47%6%45%446%32%
1980
21st to endDay
19%11%48%6%34445%31%
2178
April1st to 10thDay
23%14%37%5%34446%27%
2116
11th to 20thDay
20%10%35%5%3345%6%35%
2312
21st to endDay
27%10%35%434446%31%
2340
May1st to 10thDay
24%10%36%5%3445%5%31%
2340
11th to 20thDay
26%7%25%5%3445%5%35%
2406
21st to endDay
20%7%36%6%3446%8%34%
2839
June1st to 10thDay
26%8%47%5%35%45%7%27%
2700
11th to 20thDay
22%7%36%5%2445%7%36%
2700
21st to endDay
27%8%35%5%35%45%6%28%
2700
July1st to 10thDay
16%7%35%5%46%47%8%35%
2700
11th to 20thDay
15%6%35%5%46%5%7%9%34%
2680
21st to endDay
16%7%36%6%46%6%7%8%32%
2650
August1st to 10thDay
18%7%25%7%35%6%5%8%34%
2327
11th to 20thDay
17%6%36%6%45%6%6%7%34%
2304
21st to endDay
15%5%25%6%345%5%8%42%
2574
September1st to 10thDay
13%5%25%435%5%5%8%44%
2140
11th to 20thDay
18%6%25%434445%46%
1980
21st to endDay
19%5%25%5%23446%44%
1980
October1st to 10thDay
18%8%25%5%3445%6%41%
1848
11th to 20thDay
21%7%25%5%3445%7%36%
1800
21st to endDay
23%9%47%7%34445%30%
1841
November1st to 10thDay
21%7%36%5%33447%36%
1628
11th to 20thDay
20%7%36%5%35%45%8%34%
1520
21st to endDay
21%11%47%5%35%445%31%
1520
December1st to 10thDay
24%10%46%5%3445%7%28%
1463
11th to 20thDay
23%11%49%6%35%445%27%
1668
21st to endDay
22%11%47%5%33335%33%
2431
January1st to 10thNight
16%13%48%8%35%5%5%6%28%
2838
11th to 20thNight
18%12%48%7%35%5%5%6%27%
2670
21st to endNight
13%9%46%5%35%5%6%7%34%
2773
February1st to 10thNight
16%12%47%5%35%5%5%6%32%
2340
11th to 20thNight
17%12%5%7%6%45%5%6%6%28%
2273
21st to endNight
15%12%36%6%45%5%5%6%32%
1798
March1st to 10thNight
16%14%47%6%3444433%
2075
11th to 20thNight
18%9%46%6%35%5%5%6%32%
1979
21st to endNight
18%10%47%7%34345%35%
2178
April1st to 10thNight
25%11%35%6%34445%31%
1840
11th to 20thNight
23%7%25%5%345%45%37%
1598
21st to endNight
27%9%35%424447%31%
1620
May1st to 10thNight
23%8%26%5%3445%7%32%
1620
11th to 20thNight
26%8%45%6%24445%33%
1485
21st to endNight
18%7%47%6%445%5%6%35%
1449
June1st to 10thNight
25%8%35%5%37%447%28%
1260
11th to 20thNight
20%7%35%6%345%6%7%35%
1260
21st to endNight
26%6%25%5%24447%34%
1260
July1st to 10thNight
16%7%25%445%6%6%8%38%
1260
11th to 20thNight
16%7%25%5%345%7%10%36%
1277
21st to endNight
19%6%27%6%35%5%6%9%32%
1648
August1st to 10thNight
16%5%25%6%345%5%7%41%
1612
11th to 20thNight
16%8%35%5%345%5%9%37%
1596
21st to endNight
13%6%35%43346%7%47%
1782
September1st to 10thNight
15%5%25%4345%5%7%46%
1817
11th to 20thNight
17%6%34423435%48%
1980
21st to endNight
19%5%245%23446%46%
1980
October1st to 10thNight
19%6%25%43436%6%42%
2111
11th to 20thNight
18%8%25%6%445%47%37%
2160
21st to endNight
24%9%26%5%2445%6%33%
2510
November1st to 10thNight
22%6%36%5%34446%37%
2449
11th to 20thNight
20%6%26%6%3445%6%36%
2660
21st to endNight
21%9%36%5%35%5%5%6%31%
2660
December1st to 10thNight
26%10%36%5%34446%28%
2712
11th to 20thNight
25%10%36%5%35%5%5%5%27%
3531
21st to endNight
22%12%47%5%3434433%
5236

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
57%5%13%15%9%1
1328
11th to 20thDay
61%48%17%9%1
1505
21st to endDay
48%411%21%15%2
1726
February1st to 10thDay
55%5%12%19%9%1
1620
11th to 20thDay
57%5%10%17%10%1
1581
21st to endDay
50%411%21%11%3
1456
March1st to 10thDay
57%49%16%11%2
1876
11th to 20thDay
53%411%16%13%3
1980
21st to endDay
56%38%18%11%4
2178
April1st to 10thDay
59%49%14%13%2
2116
11th to 20thDay
50%311%21%13%2
2312
21st to endDay
56%5%8%15%12%5%
2340
May1st to 10thDay
56%47%18%12%3
2340
11th to 20thDay
51%5%10%20%12%2
2410
21st to endDay
49%6%12%23%9%1
2839
June1st to 10thDay
58%5%10%16%11%1
2700
11th to 20thDay
49%5%11%19%15%1
2700
21st to endDay
57%7%9%16%10%1
2700
July1st to 10thDay
45%7%15%22%10%1
2625
11th to 20thDay
44%7%15%23%10%1
2599
21st to endDay
49%6%13%22%9%1
2502
August1st to 10thDay
49%6%15%24%6%
2314
11th to 20thDay
48%7%13%24%9%
2304
21st to endDay
41%6%13%27%13%1
2574
September1st to 10thDay
38%6%14%27%14%
2140
11th to 20thDay
41%49%27%16%2
1980
21st to endDay
42%49%27%17%1
1980
October1st to 10thDay
45%412%27%12%
1848
11th to 20thDay
47%5%14%25%8%1
1800
21st to endDay
57%410%18%11%
1841
November1st to 10thDay
50%412%20%13%1
1628
11th to 20thDay
47%5%14%18%13%1
1520
21st to endDay
55%5%14%19%7%
1520
December1st to 10thDay
57%5%11%18%8%1
1463
11th to 20thDay
62%38%17%9%1
1668
21st to endDay
55%411%17%10%3
2431
January1st to 10thNight
57%5%11%17%9%1
2838
11th to 20thNight
57%6%10%17%8%1
2670
21st to endNight
48%5%11%22%12%2
2773
February1st to 10thNight
52%412%18%12%1
2340
11th to 20thNight
55%5%10%17%10%2
2276
21st to endNight
53%5%10%18%13%2
1798
March1st to 10thNight
54%47%20%12%2
2084
11th to 20thNight
51%5%11%17%14%2
1980
21st to endNight
53%39%19%13%2
2178
April1st to 10thNight
57%48%14%12%4
1840
11th to 20thNight
50%410%19%16%2
1598
21st to endNight
55%5%9%16%13%3
1620
May1st to 10thNight
51%5%10%20%12%2
1620
11th to 20thNight
55%39%19%12%2
1486
21st to endNight
51%6%11%19%11%1
1450
June1st to 10thNight
56%5%9%19%9%1
1260
11th to 20thNight
48%5%11%23%11%1
1260
21st to endNight
52%6%11%20%9%1
1260
July1st to 10thNight
44%7%16%23%10%
1225
11th to 20thNight
43%7%16%23%10%
1235
21st to endNight
50%7%12%20%11%1
1556
August1st to 10thNight
42%8%15%27%9%
1600
11th to 20thNight
45%10%14%24%7%
1596
21st to endNight
37%6%15%28%14%1
1782
September1st to 10thNight
38%6%13%28%13%1
1817
11th to 20thNight
40%412%28%16%1
1980
21st to endNight
41%5%9%29%15%2
1980
October1st to 10thNight
42%412%25%16%1
2111
11th to 20thNight
47%6%11%25%10%1
2160
21st to endNight
54%5%9%20%11%
2510
November1st to 10thNight
49%5%13%22%11%1
2449
11th to 20thNight
49%5%12%20%12%1
2660
21st to endNight
53%7%14%16%11%1
2660
December1st to 10thNight
58%5%10%19%8%
2712
11th to 20thNight
58%410%19%9%1
3532
21st to endNight
56%411%19%7%4
5236

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
32%15%35%16%2
180
11th to 20thDay
36%22%30%9%31
180
21st to endDay
24%20%33%18%41
282
February1st to 10thDay
32%16%32%16%4
340
11th to 20thDay
32%23%28%14%31
336
21st to endDay
26%24%28%18%3
336
March1st to 10thDay
31%21%32%12%3
420
11th to 20thDay
30%19%32%14%42
420
21st to endDay
33%19%28%11%7%2
462
April1st to 10thDay
42%20%24%11%3
420
11th to 20thDay
35%18%29%13%41
412
21st to endDay
36%17%28%13%5%1
420
May1st to 10thDay
36%16%28%15%41
423
11th to 20thDay
33%16%28%15%6%1
552
21st to endDay
28%15%35%15%7%
680
June1st to 10thDay
35%15%27%17%5%1
630
11th to 20thDay
29%13%27%21%8%1
630
21st to endDay
29%10%31%21%8%1
630
July1st to 10thDay
24%11%34%19%10%1
620
11th to 20thDay
21%9%33%24%12%2
598
21st to endDay
17%9%39%26%8%2
488
August1st to 10thDay
19%10%35%24%11%2
446
11th to 20thDay
20%12%24%29%12%3
439
21st to endDay
22%12%25%27%11%3
495
September1st to 10thDay
13%14%35%25%10%3
450
11th to 20thDay
26%10%30%21%10%3
450
21st to endDay
23%16%29%17%10%5%
450
October1st to 10thDay
24%16%23%22%11%4
383
11th to 20thDay
24%18%28%17%10%3
360
21st to endDay
31%19%29%15%6%
396
November1st to 10thDay
31%14%28%19%6%1
365
11th to 20thDay
34%18%25%15%7%
370
21st to endDay
34%20%26%17%21
370
December1st to 10thDay
35%15%29%17%4
313
11th to 20thDay
42%21%26%10%1
180
21st to endDay
33%26%26%12%31
198
January1st to 10thNight
28%18%30%21%3
850
11th to 20thNight
30%16%30%20%3
765
21st to endNight
21%21%34%19%4
820
February1st to 10thNight
25%21%31%19%3
720
11th to 20thNight
30%19%32%15%3
703
21st to endNight
26%18%31%22%4
592
March1st to 10thNight
26%18%34%20%2
720
11th to 20thNight
25%16%34%19%6%
720
21st to endNight
27%15%33%20%5%
792
April1st to 10thNight
36%15%30%17%3
652
11th to 20thNight
30%16%31%17%5%
534
21st to endNight
34%13%29%18%6%
540
May1st to 10thNight
27%14%30%24%4
540
11th to 20thNight
33%11%32%19%5%
532
21st to endNight
22%13%36%25%4
482
June1st to 10thNight
29%8%30%27%6%
360
11th to 20thNight
23%9%29%33%6%1
360
21st to endNight
30%6%26%31%6%
360
July1st to 10thNight
19%7%36%29%9%
350
11th to 20thNight
18%5%27%36%13%
348
21st to endNight
21%6%29%35%9%
468
August1st to 10thNight
19%427%37%12%
538
11th to 20thNight
19%6%27%34%13%
532
21st to endNight
16%8%29%31%15%1
594
September1st to 10thNight
18%10%34%27%11%1
589
11th to 20thNight
21%9%25%31%13%2
720
21st to endNight
22%12%27%28%10%1
720
October1st to 10thNight
22%10%29%27%10%1
720
11th to 20thNight
22%13%29%25%9%1
720
21st to endNight
30%16%29%20%5%
792
November1st to 10thNight
28%15%28%24%6%1
760
11th to 20thNight
30%15%28%19%7%1
850
21st to endNight
30%17%27%21%4
850
December1st to 10thNight
34%14%29%18%4
850
11th to 20thNight
33%19%28%17%3
850
21st to endNight
32%19%27%18%31
935
Page generated at 2024-01-24 10:37:27. Version ac07

Copyright 2024 Attilla Danko


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