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 2005-11-05 to 2017-09-22.

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
24%
14814
14%
46825
6%
14776
33%
14776
16%
32769

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
14%
741
14%
2631
2%
737
28%
737
10%
1844
January16th to endNight
16%
768
15%
2625
3%
768
31%
768
13%
1796
February1st to 15thNight
17%
704
13%
2286
3%
701
28%
701
14%
1597
February16th to endNight
17%
631
12%
1967
2%
631
29%
631
11%
1465
March1st to 15thNight
17%
720
17%
2049
6%
720
28%
720
15%
1494
March16th to endNight
19%
768
17%
2112
5%
768
29%
768
18%
1506
April1st to 15thNight
17%
614
15%
1764
4%
614
26%
614
14%
1302
April16th to endNight
21%
540
16%
1620
6%
540
30%
540
18%
1120
May1st to 15thNight
24%
540
12%
1605
6%
540
31%
540
16%
1159
May16th to endNight
21%
492
10%
1427
4%
491
29%
491
14%
1081
June1st to 15thNight
28%
360
7%
1260
5%
360
32%
360
13%
928
June16th to endNight
33%
360
8%
1260
7%
360
36%
360
16%
871
July1st to 15thNight
37%
340
11%
1190
8%
340
45%
340
22%
779
July16th to endNight
39%
427
10%
1418
8%
401
45%
401
17%
977
August1st to 15thNight
43%
539
10%
1608
8%
535
45%
535
21%
1108
August16th to endNight
39%
573
20%
1719
10%
573
46%
573
28%
1070
September1st to 15thNight
32%
633
15%
1872
7%
633
39%
633
23%
1244
September16th to endNight
38%
685
25%
1891
13%
685
48%
685
32%
1147
October1st to 15thNight
30%
660
20%
1950
8%
660
41%
660
23%
1276
October16th to endNight
21%
704
16%
2194
4%
704
33%
704
14%
1569
November1st to 15thNight
24%
715
16%
2364
8%
715
34%
715
16%
1641
November16th to endNight
24%
750
15%
2520
6%
750
36%
750
13%
1780
December1st to 15thNight
14%
750
13%
2613
3%
750
26%
750
10%
1901
December16th to endNight
11%
800
12%
2880
3%
800
24%
800
8%
2114

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%8%35%5%3445%6%32%
48060
Night
19%8%35%5%2445%6%34%
46991
TransparencyDay
52%410%20%10%1
47744
Night
50%5%11%21%10%1
46825
SeeingDay
28%13%29%19%8%1
6793
Night
26%13%30%22%6%
14814

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
16%10%47%5%3445%6%31%
1304
16th to endDay
15%10%47%7%33345%32%
1598
February1st to 15thDay
13%10%47%6%46%447%29%
1575
16th to endDay
16%13%47%7%3445%5%27%
1504
March1st to 15thDay
21%13%35%5%24335%30%
1900
16th to endDay
16%10%5%7%6%34436%31%
2112
April1st to 15thDay
22%11%36%423345%31%
2183
16th to endDay
26%6%34423345%34%
2340
May1st to 15thDay
25%8%36%424345%29%
2345
16th to endDay
26%7%25%5%2435%6%29%
2696
June1st to 15thDay
27%8%46%5%34346%25%
2700
16th to endDay
24%7%46%5%3445%6%27%
2700
July1st to 15thDay
15%6%245%35%47%8%34%
2700
16th to endDay
17%7%35%5%36%6%6%8%29%
2637
August1st to 15thDay
20%6%25%6%345%5%6%32%
2340
16th to endDay
14%425%6%35%5%5%7%39%
2483
September1st to 15thDay
17%6%15%434446%41%
2086
16th to endDay
16%5%23423335%48%
1881
October1st to 15thDay
20%7%24423345%40%
1679
16th to endDay
24%7%35%5%34345%31%
1675
November1st to 15thDay
23%7%26%42335%8%33%
1494
16th to endDay
20%10%45%425%446%32%
1440
December1st to 15thDay
25%8%45%424346%28%
1344
16th to endDay
24%11%46%5%24345%26%
1344
January1st to 15thNight
15%9%47%6%35%5%5%5%32%
2631
16th to endNight
14%10%35%5%35%5%5%7%31%
2625
February1st to 15thNight
13%11%47%5%35%5%5%6%32%
2285
16th to endNight
17%14%46%5%345%5%5%28%
1967
March1st to 15thNight
19%9%36%5%2444433%
2037
16th to endNight
18%8%46%5%23445%35%
2112
April1st to 15thNight
23%9%346%3444432%
1764
16th to endNight
26%6%24313436%36%
1620
May1st to 15thNight
23%7%25%6%3445%7%29%
1605
16th to endNight
23%7%36%6%34445%29%
1425
June1st to 15thNight
25%6%35%5%25%45%6%27%
1260
16th to endNight
21%7%15%5%25%5%5%8%31%
1260
July1st to 15thNight
14%5%145%45%6%5%10%35%
1260
16th to endNight
19%5%26%5%35%46%9%31%
1517
August1st to 15thNight
17%6%25%6%34447%37%
1620
16th to endNight
13%5%2443346%7%45%
1719
September1st to 15thNight
17%5%25%423446%41%
1872
16th to endNight
14%413423337%51%
1891
October1st to 15thNight
18%7%25%32335%6%40%
1950
16th to endNight
23%8%15%5%23345%34%
2194
November1st to 15thNight
23%5%25%5%33445%35%
2364
16th to endNight
21%8%35%433445%34%
2520
December1st to 15thNight
25%9%35%5%34435%30%
2613
16th to endNight
26%10%45%42445%5%27%
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
52%6%13%17%8%1
1305
16th to endDay
54%38%21%11%
1598
February1st to 15thDay
54%412%19%7%1
1578
16th to endDay
58%410%16%7%1
1504
March1st to 15thDay
57%39%16%11%2
1911
16th to endDay
53%39%18%12%2
2112
April1st to 15thDay
55%38%16%13%2
2183
16th to endDay
52%39%17%13%3
2340
May1st to 15thDay
56%47%18%10%2
2345
16th to endDay
55%5%10%20%6%
2700
June1st to 15thDay
60%5%9%14%9%1
2700
16th to endDay
57%6%10%16%9%
2700
July1st to 15thDay
44%7%14%21%12%
2541
16th to endDay
51%6%15%19%7%
2474
August1st to 15thDay
51%5%12%23%6%
2327
16th to endDay
42%6%13%26%10%
2483
September1st to 15thDay
43%410%26%13%
2086
16th to endDay
38%38%29%18%1
1881
October1st to 15thDay
45%412%25%11%
1679
16th to endDay
55%310%21%8%
1675
November1st to 15thDay
50%5%13%16%13%
1494
16th to endDay
53%5%13%17%9%
1440
December1st to 15thDay
56%5%11%20%6%
1344
16th to endDay
60%38%17%9%
1344
January1st to 15thNight
52%6%11%19%10%
2631
16th to endNight
50%411%21%10%
2625
February1st to 15thNight
51%412%20%9%
2286
16th to endNight
56%5%9%14%11%1
1967
March1st to 15thNight
53%48%19%11%2
2049
16th to endNight
51%38%21%13%1
2112
April1st to 15thNight
55%48%15%12%3
1764
16th to endNight
50%38%17%16%3
1620
May1st to 15thNight
53%410%19%9%2
1605
16th to endNight
58%5%10%16%8%
1427
June1st to 15thNight
58%5%10%18%5%1
1260
16th to endNight
50%6%11%21%9%
1260
July1st to 15thNight
43%7%16%23%9%
1190
16th to endNight
49%6%13%20%9%
1418
August1st to 15thNight
46%7%13%24%8%
1608
16th to endNight
37%6%15%30%10%
1719
September1st to 15thNight
43%5%10%26%13%1
1872
16th to endNight
34%311%32%16%
1891
October1st to 15thNight
43%311%26%14%
1950
16th to endNight
53%48%22%10%
2194
November1st to 15thNight
50%5%13%19%9%1
2364
16th to endNight
52%5%12%18%10%
2520
December1st to 15thNight
57%410%22%5%
2613
16th to endNight
58%5%10%17%8%
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
25%20%38%15%1
60
16th to endDay
25%17%35%15%6%
126
February1st to 15thDay
22%13%35%22%5%
236
16th to endDay
26%19%26%20%6%
226
March1st to 15thDay
32%18%31%11%5%
270
16th to endDay
28%15%30%13%7%3
288
April1st to 15thDay
36%17%26%12%5%
270
16th to endDay
31%17%30%14%5%2
270
May1st to 15thDay
35%15%27%12%5%2
301
16th to endDay
33%12%30%15%7%
519
June1st to 15thDay
36%12%24%19%5%
495
16th to endDay
30%9%31%19%8%1
495
July1st to 15thDay
23%9%29%23%12%1
475
16th to endDay
21%6%32%26%11%1
371
August1st to 15thDay
23%6%30%24%12%3
313
16th to endDay
19%10%25%25%13%4
332
September1st to 15thDay
19%11%33%25%8%2
315
16th to endDay
21%11%29%20%11%5%
278
October1st to 15thDay
27%14%22%18%13%4
230
16th to endDay
32%17%28%12%7%
240
November1st to 15thDay
31%11%28%19%8%1
235
16th to endDay
32%15%25%20%5%
240
December1st to 15thDay
36%17%23%17%4
144
16th to endDay
43%17%28%10%
64
January1st to 15thNight
26%16%33%20%2
741
16th to endNight
24%17%34%19%4
768
February1st to 15thNight
22%17%35%19%4
704
16th to endNight
29%16%30%18%3
631
March1st to 15thNight
26%17%32%20%2
720
16th to endNight
26%14%33%19%6%
768
April1st to 15thNight
31%15%30%17%4
614
16th to endNight
32%11%31%18%5%
540
May1st to 15thNight
28%12%29%23%5%
540
16th to endNight
29%9%34%20%5%
492
June1st to 15thNight
30%7%29%27%5%
360
16th to endNight
25%6%30%30%6%
360
July1st to 15thNight
16%5%35%30%12%
340
16th to endNight
21%5%28%34%10%
427
August1st to 15thNight
22%423%35%14%
539
16th to endNight
16%6%32%29%14%
573
September1st to 15thNight
22%9%30%27%9%
633
16th to endNight
17%10%30%29%11%1
685
October1st to 15thNight
23%11%30%23%9%1
660
16th to endNight
29%14%29%19%5%
704
November1st to 15thNight
26%13%30%20%7%
715
16th to endNight
29%15%24%21%7%
750
December1st to 15thNight
33%15%28%17%4
750
16th to endNight
36%17%27%14%2
800
Page generated at 2017-09-23 07:43:44. Version ac04

Copyright 2017 A. Danko


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