Matane
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Matane clear sky chart from 2005-11-05 to 2017-12-20.

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%
15003
9%
48030
5%
14971
29%
14971
11%
37602

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
10%
750
4%
2685
1%
746
14%
746
3%
2371
January16th to endNight
17%
771
8%
2706
3%
771
23%
771
6%
2273
February1st to 15thNight
20%
704
5%
2328
2%
701
25%
701
8%
1871
February16th to endNight
19%
631
6%
1982
3%
631
23%
631
8%
1631
March1st to 15thNight
23%
720
14%
2077
8%
720
29%
720
13%
1613
March16th to endNight
25%
768
16%
2112
6%
768
33%
768
16%
1572
April1st to 15thNight
22%
610
12%
1713
5%
610
27%
610
13%
1340
April16th to endNight
28%
540
16%
1620
9%
540
35%
540
18%
1137
May1st to 15thNight
34%
534
8%
1542
6%
534
36%
534
17%
1176
May16th to endNight
27%
375
9%
1310
5%
374
33%
374
12%
990
June1st to 15thNight
39%
360
4%
1260
3%
360
40%
360
16%
894
June16th to endNight
36%
360
5%
1260
4%
360
37%
360
14%
920
July1st to 15thNight
36%
340
5%
1190
4%
340
38%
340
17%
836
July16th to endNight
46%
376
9%
1298
9%
354
50%
354
18%
886
August1st to 15thNight
46%
486
7%
1557
7%
484
47%
484
17%
1121
August16th to endNight
45%
573
12%
1719
7%
573
48%
573
20%
1202
September1st to 15thNight
34%
633
11%
1838
7%
633
37%
633
20%
1308
September16th to endNight
29%
717
17%
1980
10%
717
35%
717
24%
1342
October1st to 15thNight
29%
720
14%
2124
7%
720
36%
720
18%
1503
October16th to endNight
21%
768
9%
2455
5%
768
26%
768
11%
1916
November1st to 15thNight
18%
793
11%
2613
5%
793
24%
793
9%
2043
November16th to endNight
16%
825
6%
2785
3%
825
20%
825
6%
2349
December1st to 15thNight
8%
825
2%
2925
0%
825
11%
825
2%
2675
December16th to endNight
12%
824
3%
2951
1%
824
14%
824
2%
2633

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
19%9%36%5%35%446%29%
48832
Night
20%12%48%7%35%445%24%
48184
TransparencyDay
55%7%12%16%7%
48504
Night
61%6%10%14%6%
48030
SeeingDay
25%12%28%21%9%1
6946
Night
25%14%27%22%8%1
15003

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
18%17%6%13%11%5%4345%7%
1253
16th to endDay
11%14%5%11%9%5%10%8%4315%
1515
February1st to 15thDay
8%14%410%10%7%9%6%5%5%17%
1533
16th to endDay
14%15%6%10%8%5%5%436%20%
1491
March1st to 15thDay
17%12%5%5%5%47%5%46%25%
1871
16th to endDay
14%14%5%6%5%2435%6%31%
2112
April1st to 15thDay
21%12%45%5%34345%29%
2233
16th to endDay
19%8%35%434347%36%
2340
May1st to 15thDay
23%7%35%422447%33%
2419
16th to endDay
26%7%245%33447%30%
2805
June1st to 15thDay
21%6%26%5%245%47%32%
2700
16th to endDay
23%6%245%25%45%8%29%
2700
July1st to 15thDay
15%6%35%5%345%6%8%35%
2700
16th to endDay
15%435%5%35%45%7%37%
2778
August1st to 15thDay
16%5%25%4345%6%9%35%
2380
16th to endDay
17%424435%5%6%9%38%
2483
September1st to 15thDay
23%5%24423346%40%
2121
16th to endDay
21%6%24324336%41%
1980
October1st to 15thDay
21%7%35%5%34446%33%
1836
16th to endDay
29%11%35%5%23346%26%
1767
November1st to 15thDay
23%12%5%7%6%24345%23%
1573
16th to endDay
23%16%6%11%6%3443316%
1505
December1st to 15thDay
20%14%6%12%13%6%6%3239%
1365
16th to endDay
19%17%7%12%10%6%6%3437%
1372
January1st to 15thNight
17%16%7%11%12%5%5%44310%
2685
16th to endNight
10%16%6%11%8%6%10%6%4414%
2706
February1st to 15thNight
8%13%6%11%9%6%7%5%5%6%19%
2327
16th to endNight
16%18%6%8%8%45%43419%
1982
March1st to 15thNight
18%13%5%7%7%35%43326%
2065
16th to endNight
16%14%46%5%33335%33%
2112
April1st to 15thNight
25%12%36%5%33335%26%
1713
16th to endNight
25%7%2432335%5%35%
1620
May1st to 15thNight
25%7%47%424446%27%
1542
16th to endNight
24%7%37%5%35%6%6%5%25%
1308
June1st to 15thNight
22%7%35%6%2446%7%28%
1260
16th to endNight
21%9%36%6%25%45%6%29%
1260
July1st to 15thNight
19%6%36%6%35%5%6%6%30%
1260
16th to endNight
15%5%345%36%5%7%10%32%
1387
August1st to 15thNight
17%5%26%5%35%5%7%8%31%
1567
16th to endNight
17%5%25%5%35%5%7%8%33%
1719
September1st to 15thNight
20%6%36%5%34445%35%
1838
16th to endNight
24%412422345%43%
1980
October1st to 15thNight
22%7%24424445%36%
2124
16th to endNight
29%10%35%424445%24%
2455
November1st to 15thNight
26%13%5%6%423435%24%
2613
16th to endNight
21%17%6%12%6%2333416%
2785
December1st to 15thNight
21%18%8%13%11%443328%
2925
16th to endNight
18%19%7%12%10%5%5%2349%
2951

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
78%5%8%5%1
1254
16th to endDay
69%8%7%11%3
1515
February1st to 15thDay
66%8%12%9%3
1536
16th to endDay
66%5%9%13%5%
1491
March1st to 15thDay
58%6%11%15%7%
1882
16th to endDay
53%5%11%17%10%1
2112
April1st to 15thDay
56%5%10%16%9%1
2233
16th to endDay
49%412%19%13%1
2340
May1st to 15thDay
50%6%10%20%10%1
2419
16th to endDay
53%7%11%18%9%
2809
June1st to 15thDay
51%8%10%16%11%1
2700
16th to endDay
53%9%11%17%8%
2700
July1st to 15thDay
44%9%17%21%6%
2541
16th to endDay
46%8%15%21%8%
2604
August1st to 15thDay
43%10%19%21%4
2366
16th to endDay
41%8%22%20%5%
2483
September1st to 15thDay
45%6%17%23%7%
2121
16th to endDay
44%7%15%23%8%
1980
October1st to 15thDay
50%7%14%16%9%
1836
16th to endDay
60%7%10%15%5%
1767
November1st to 15thDay
63%5%12%12%4
1573
16th to endDay
72%5%11%7%2
1505
December1st to 15thDay
80%6%6%5%
1365
16th to endDay
80%6%5%5%1
1372
January1st to 15thNight
78%6%6%6%1
2685
16th to endNight
70%6%6%11%3
2706
February1st to 15thNight
65%6%11%11%4
2328
16th to endNight
68%6%8%11%5%
1982
March1st to 15thNight
62%38%16%8%
2077
16th to endNight
55%49%18%11%1
2112
April1st to 15thNight
61%48%10%13%1
1713
16th to endNight
51%38%19%15%1
1620
May1st to 15thNight
57%5%9%15%10%1
1542
16th to endNight
58%7%8%16%8%1
1310
June1st to 15thNight
53%5%12%17%9%1
1260
16th to endNight
54%7%9%16%11%
1260
July1st to 15thNight
51%6%15%20%6%
1190
16th to endNight
45%9%16%19%9%
1298
August1st to 15thNight
47%11%16%20%4
1557
16th to endNight
44%10%18%21%5%
1719
September1st to 15thNight
49%6%13%21%9%
1838
16th to endNight
43%6%15%23%10%
1980
October1st to 15thNight
49%5%13%21%9%
2124
16th to endNight
61%6%12%14%5%
2455
November1st to 15thNight
62%6%11%13%4
2613
16th to endNight
71%6%10%7%3
2785
December1st to 15thNight
82%5%6%31
2925
16th to endNight
80%47%5%1
2951

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
23%28%38%6%3
60
16th to endDay
23%14%39%18%31
64
February1st to 15thDay
16%13%38%21%7%1
194
16th to endDay
28%16%30%15%8%
224
March1st to 15thDay
26%15%30%16%9%1
270
16th to endDay
22%16%30%19%9%1
288
April1st to 15thDay
28%14%34%15%42
270
16th to endDay
25%15%33%15%6%3
270
May1st to 15thDay
28%10%28%21%8%2
360
16th to endDay
31%11%29%18%8%
519
June1st to 15thDay
26%9%25%27%10%
495
16th to endDay
27%8%26%24%10%1
495
July1st to 15thDay
18%8%29%27%12%3
475
16th to endDay
21%5%26%30%13%2
449
August1st to 15thDay
19%426%29%16%3
313
16th to endDay
21%9%25%26%13%4
332
September1st to 15thDay
26%6%28%25%10%2
315
16th to endDay
22%12%33%18%10%2
314
October1st to 15thDay
22%21%26%19%9%1
279
16th to endDay
38%16%19%13%9%2
288
November1st to 15thDay
33%21%23%15%41
280
16th to endDay
31%18%27%16%4
230
December1st to 15thDay
24%20%35%13%5%1
90
16th to endDay
27%20%34%16%
72
January1st to 15thNight
25%22%32%14%4
750
16th to endNight
19%23%30%20%5%
771
February1st to 15thNight
14%17%34%23%8%
704
16th to endNight
27%12%30%20%7%1
631
March1st to 15thNight
25%16%29%20%8%
720
16th to endNight
22%16%28%22%8%1
768
April1st to 15thNight
30%16%24%19%7%1
610
16th to endNight
29%12%24%23%9%1
540
May1st to 15thNight
26%8%23%29%11%
534
16th to endNight
27%7%30%23%11%
375
June1st to 15thNight
27%419%36%11%
360
16th to endNight
22%5%27%29%13%1
360
July1st to 15thNight
21%6%27%30%10%3
340
16th to endNight
14%6%23%38%14%1
376
August1st to 15thNight
18%5%20%32%21%2
486
16th to endNight
17%5%25%34%13%2
573
September1st to 15thNight
23%8%27%26%12%1
633
16th to endNight
25%8%32%24%7%1
717
October1st to 15thNight
26%12%27%21%9%1
720
16th to endNight
35%14%22%18%7%
768
November1st to 15thNight
32%17%26%16%5%1
793
16th to endNight
29%20%25%17%6%
825
December1st to 15thNight
30%24%27%14%3
825
16th to endNight
27%21%25%18%5%1
824
Page generated at 2017-12-21 07:04:53. Version ac04

Copyright 2017 A. Danko


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