Gaspé
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gaspé clear sky chart from 2005-11-05 to 2018-02-14.

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
27%
15340
11%
48778
5%
15302
34%
15302
13%
36013

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%
825
7%
2910
1%
821
21%
821
6%
2326
January16th to endNight
17%
860
12%
2960
4%
860
27%
860
11%
2182
February1st to 15thNight
21%
760
13%
2465
3%
757
34%
757
13%
1780
February16th to endNight
22%
631
10%
2051
3%
631
30%
631
10%
1574
March1st to 15thNight
21%
720
15%
2026
4%
720
31%
720
13%
1516
March16th to endNight
24%
768
14%
2112
5%
768
33%
768
16%
1546
April1st to 15thNight
24%
539
13%
1741
7%
539
30%
539
13%
1287
April16th to endNight
27%
540
16%
1620
8%
540
33%
540
18%
1146
May1st to 15thNight
39%
540
9%
1455
6%
540
42%
540
20%
1079
May16th to endNight
33%
480
10%
1414
4%
479
38%
479
17%
1032
June1st to 15thNight
33%
360
4%
1260
3%
360
35%
360
13%
920
June16th to endNight
41%
360
4%
1260
4%
360
42%
360
15%
914
July1st to 15thNight
50%
340
6%
1190
6%
340
51%
340
21%
768
July16th to endNight
47%
427
10%
1288
8%
401
49%
401
18%
893
August1st to 15thNight
52%
539
10%
1561
9%
535
54%
535
23%
1058
August16th to endNight
46%
573
15%
1734
10%
573
50%
573
22%
1176
September1st to 15thNight
37%
540
14%
1800
9%
540
44%
540
20%
1183
September16th to endNight
35%
705
18%
2001
11%
705
42%
705
26%
1294
October1st to 15thNight
29%
720
16%
2160
6%
720
40%
720
19%
1485
October16th to endNight
24%
778
12%
2401
4%
778
31%
778
12%
1777
November1st to 15thNight
22%
805
13%
2663
6%
805
31%
805
12%
1960
November16th to endNight
20%
825
8%
2730
2%
825
26%
825
8%
2165
December1st to 15thNight
12%
825
8%
2856
1%
825
19%
825
6%
2313
December16th to endNight
13%
880
7%
3120
2%
880
20%
880
5%
2639

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%3445%6%29%
49319
Night
18%10%36%5%3445%6%31%
48934
TransparencyDay
53%7%12%17%7%
48991
Night
53%7%11%17%8%
48780
SeeingDay
24%13%28%21%9%2
7486
Night
24%13%26%23%10%1
15340

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
11%15%6%9%6%5%5%5%5%6%22%
1358
16th to endDay
11%12%5%9%7%45%45%6%28%
1616
February1st to 15thDay
7%13%48%8%45%5%5%7%29%
1696
16th to endDay
13%14%5%9%6%35%445%26%
1422
March1st to 15thDay
16%10%46%5%35%35%7%29%
1920
16th to endDay
13%12%46%6%34446%32%
2112
April1st to 15thDay
16%11%47%6%3445%5%28%
2206
16th to endDay
24%8%44423346%33%
2340
May1st to 15thDay
22%10%45%424445%31%
2497
16th to endDay
22%9%25%6%3445%6%28%
2708
June1st to 15thDay
24%9%35%42345%6%31%
2700
16th to endDay
26%7%25%5%35%45%7%25%
2700
July1st to 15thDay
18%6%35%446%5%6%8%31%
2700
16th to endDay
18%6%36%5%36%46%7%31%
2780
August1st to 15thDay
19%5%25%5%36%46%8%32%
2387
16th to endDay
16%6%36%5%345%5%8%33%
2467
September1st to 15thDay
20%5%25%5%2345%6%38%
2160
16th to endDay
17%6%245%33446%40%
1956
October1st to 15thDay
17%7%25%6%245%6%6%35%
1800
16th to endDay
28%11%35%5%24445%25%
1820
November1st to 15thDay
20%11%5%7%5%45%346%26%
1525
16th to endDay
18%13%5%8%6%45%445%23%
1560
December1st to 15thDay
21%12%49%6%36%35%6%19%
1433
16th to endDay
18%14%6%9%7%5%6%5%5%5%16%
1456
January1st to 15thNight
14%12%5%8%7%5%5%45%7%22%
2910
16th to endNight
11%11%48%7%35%45%6%29%
2960
February1st to 15thNight
9%13%48%5%36%5%5%6%31%
2465
16th to endNight
15%15%5%7%6%3445%6%26%
2051
March1st to 15thNight
16%10%47%6%445%5%430%
2014
16th to endNight
16%11%5%5%5%24446%33%
2112
April1st to 15thNight
22%10%36%5%2445%6%27%
1741
16th to endNight
24%9%35%32234436%
1620
May1st to 15thNight
21%7%46%5%35%43434%
1455
16th to endNight
21%7%35%5%245%6%6%31%
1413
June1st to 15thNight
24%7%26%5%3335%6%29%
1260
16th to endNight
23%5%36%5%25%45%6%30%
1260
July1st to 15thNight
18%5%24425%447%40%
1260
16th to endNight
15%6%25%5%345%6%8%36%
1376
August1st to 15thNight
18%5%1442345%7%42%
1572
16th to endNight
14%6%25%5%335%6%8%37%
1734
September1st to 15thNight
18%5%24424445%42%
1800
16th to endNight
18%5%14423245%46%
2001
October1st to 15thNight
18%7%34424445%40%
2160
16th to endNight
25%8%25%424346%30%
2401
November1st to 15thNight
23%10%36%423445%32%
2663
16th to endNight
19%12%5%9%5%35%45%5%23%
2730
December1st to 15thNight
19%13%5%7%6%35%45%7%21%
2856
16th to endNight
20%13%5%9%7%45%445%18%
3120

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
61%9%10%13%5%
1359
16th to endDay
55%6%8%17%10%
1616
February1st to 15thDay
52%8%12%19%5%1
1699
16th to endDay
60%8%7%16%6%
1422
March1st to 15thDay
53%6%9%17%11%1
1931
16th to endDay
52%6%10%19%9%2
2112
April1st to 15thDay
54%6%9%15%11%1
2206
16th to endDay
51%5%10%15%14%1
2340
May1st to 15thDay
54%5%11%16%9%1
2497
16th to endDay
55%7%13%15%8%1
2712
June1st to 15thDay
53%7%11%18%9%
2700
16th to endDay
57%8%12%14%6%
2700
July1st to 15thDay
47%9%16%20%6%
2541
16th to endDay
49%8%16%18%7%
2606
August1st to 15thDay
44%11%19%19%4
2373
16th to endDay
45%11%18%18%5%
2467
September1st to 15thDay
44%7%17%21%8%
2160
16th to endDay
42%7%14%26%8%
1956
October1st to 15thDay
47%6%17%20%7%1
1800
16th to endDay
61%5%11%13%5%1
1820
November1st to 15thDay
59%6%13%12%8%
1525
16th to endDay
62%7%13%12%4
1560
December1st to 15thDay
65%9%9%11%3
1433
16th to endDay
69%11%8%8%3
1456
January1st to 15thNight
62%9%10%11%5%
2910
16th to endNight
53%9%10%17%8%
2960
February1st to 15thNight
52%6%10%20%8%1
2466
16th to endNight
59%7%7%17%7%
2051
March1st to 15thNight
55%5%8%17%11%1
2026
16th to endNight
52%5%11%19%10%1
2112
April1st to 15thNight
55%6%9%16%11%
1741
16th to endNight
51%48%16%16%2
1620
May1st to 15thNight
52%6%9%19%10%1
1455
16th to endNight
50%7%11%18%10%
1415
June1st to 15thNight
55%6%10%13%11%
1260
16th to endNight
53%7%12%17%8%
1260
July1st to 15thNight
43%6%16%26%6%
1190
16th to endNight
45%10%14%20%9%
1288
August1st to 15thNight
41%9%18%24%5%
1561
16th to endNight
42%10%17%23%6%
1734
September1st to 15thNight
43%8%12%26%9%
1800
16th to endNight
40%5%14%26%12%
2001
October1st to 15thNight
45%6%13%22%10%1
2160
16th to endNight
54%7%12%18%6%
2401
November1st to 15thNight
53%8%12%16%7%
2663
16th to endNight
61%8%13%11%4
2730
December1st to 15thNight
63%9%9%13%3
2856
16th to endNight
69%8%7%11%3
3120

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
27%21%32%17%1
90
16th to endDay
19%22%34%17%4
171
February1st to 15thDay
17%19%33%19%7%1
277
16th to endDay
24%16%24%22%10%2
212
March1st to 15thDay
21%22%30%15%7%1
267
16th to endDay
20%22%27%17%8%3
288
April1st to 15thDay
25%20%27%18%6%2
270
16th to endDay
27%18%25%18%7%2
270
May1st to 15thDay
29%10%21%19%12%5%
453
16th to endDay
28%15%26%20%7%1
519
June1st to 15thDay
31%8%27%20%10%2
495
16th to endDay
29%9%24%21%11%3
495
July1st to 15thDay
19%5%34%24%13%2
475
16th to endDay
17%7%23%33%15%3
514
August1st to 15thDay
16%5%25%30%20%3
360
16th to endDay
18%5%31%27%13%4
332
September1st to 15thDay
23%11%35%19%7%2
315
16th to endDay
20%17%32%20%6%2
306
October1st to 15thDay
18%18%30%18%10%3
270
16th to endDay
33%20%24%13%7%
288
November1st to 15thDay
30%13%26%17%7%3
280
16th to endDay
30%18%29%17%41
285
December1st to 15thDay
34%12%28%22%2
158
16th to endDay
18%28%30%16%6%
96
January1st to 15thNight
24%17%32%18%5%
825
16th to endNight
20%17%33%21%6%
860
February1st to 15thNight
20%14%33%24%7%
760
16th to endNight
26%17%23%18%10%3
631
March1st to 15thNight
22%18%28%21%8%
720
16th to endNight
24%16%26%20%10%
768
April1st to 15thNight
29%10%27%21%9%1
539
16th to endNight
28%10%29%20%10%1
540
May1st to 15thNight
25%5%19%29%17%3
540
16th to endNight
23%10%27%26%9%2
480
June1st to 15thNight
28%6%21%26%14%1
360
16th to endNight
26%419%32%15%1
360
July1st to 15thNight
20%317%36%19%2
340
16th to endNight
16%6%21%34%20%1
427
August1st to 15thNight
20%217%35%22%2
539
16th to endNight
17%5%23%31%19%2
573
September1st to 15thNight
20%10%26%28%12%1
540
16th to endNight
20%10%29%28%10%
705
October1st to 15thNight
22%15%26%22%11%1
720
16th to endNight
30%15%24%21%7%
778
November1st to 15thNight
28%15%28%18%7%1
805
16th to endNight
26%19%28%18%6%1
825
December1st to 15thNight
28%20%31%14%3
825
16th to endNight
31%19%26%16%41
880
Page generated at 2018-02-15 10:58:43. Version ac04

Copyright 2018 A. Danko


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