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 2017-08-12.

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%
14541
11%
46391
5%
14503
34%
14503
13%
34353

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%
750
8%
2685
2%
746
21%
746
7%
2128
January16th to endNight
17%
787
11%
2733
4%
787
27%
787
11%
2025
February1st to 15thNight
21%
704
12%
2285
2%
701
33%
701
13%
1660
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
53%
528
10%
1528
9%
524
54%
524
23%
1038
August16th to endNight
46%
525
13%
1589
9%
525
50%
525
21%
1089
September1st to 15thNight
36%
495
14%
1650
9%
495
44%
495
20%
1088
September16th to endNight
34%
646
18%
1834
11%
646
41%
646
26%
1178
October1st to 15thNight
29%
660
17%
1980
6%
660
40%
660
18%
1388
October16th to endNight
23%
711
11%
2201
4%
711
30%
711
12%
1651
November1st to 15thNight
21%
730
13%
2453
5%
730
30%
730
11%
1834
November16th to endNight
20%
750
8%
2520
2%
750
26%
750
8%
1998
December1st to 15thNight
11%
750
7%
2636
1%
750
18%
750
6%
2149
December16th to endNight
13%
800
6%
2880
1%
800
19%
800
5%
2452

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%
47604
Night
18%10%36%5%3445%6%30%
46547
TransparencyDay
53%7%12%16%7%
47276
Night
54%7%11%17%8%
46393
SeeingDay
24%13%27%21%10%2
6930
Night
24%13%26%23%10%1
14541

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%45%5%5%6%22%
1253
16th to endDay
11%12%5%9%7%5%5%446%28%
1491
February1st to 15thDay
7%12%49%8%45%5%5%7%29%
1575
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%35%46%8%32%
2335
16th to endDay
17%6%36%5%345%5%8%32%
2261
September1st to 15thDay
21%5%25%5%2345%6%37%
1980
16th to endDay
17%6%235%33446%42%
1793
October1st to 15thDay
17%7%25%6%245%5%6%34%
1650
16th to endDay
30%11%35%5%23445%23%
1669
November1st to 15thDay
21%12%5%7%5%35%346%24%
1405
16th to endDay
17%14%5%8%6%45%435%23%
1440
December1st to 15thDay
21%12%5%9%6%36%35%6%19%
1323
16th to endDay
19%15%6%9%7%46%45%416%
1344
January1st to 15thNight
14%12%5%8%7%5%5%45%7%22%
2685
16th to endNight
12%11%48%7%35%45%6%29%
2733
February1st to 15thNight
9%13%48%6%36%5%5%6%30%
2285
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%
1539
16th to endNight
14%6%25%5%345%6%9%36%
1589
September1st to 15thNight
18%6%24424446%42%
1650
16th to endNight
18%414423245%47%
1834
October1st to 15thNight
19%7%34424446%38%
1980
16th to endNight
26%9%35%423346%30%
2201
November1st to 15thNight
24%11%36%423445%30%
2453
16th to endNight
19%12%5%9%6%35%45%5%24%
2520
December1st to 15thNight
19%13%5%7%6%35%45%7%20%
2636
16th to endNight
21%13%5%9%7%45%445%17%
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
61%9%10%12%5%
1254
16th to endDay
56%6%8%17%9%
1491
February1st to 15thDay
52%8%12%19%5%1
1578
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%10%19%19%4
2321
16th to endDay
46%11%18%17%5%
2261
September1st to 15thDay
44%7%17%21%8%
1980
16th to endDay
41%7%14%27%9%
1793
October1st to 15thDay
48%6%16%19%7%1
1650
16th to endDay
63%5%11%12%5%1
1669
November1st to 15thDay
61%6%12%11%7%
1405
16th to endDay
62%6%12%12%4
1440
December1st to 15thDay
65%10%10%11%2
1323
16th to endDay
70%11%8%7%2
1344
January1st to 15thNight
61%9%10%12%5%
2685
16th to endNight
54%9%11%16%8%
2733
February1st to 15thNight
53%7%10%19%7%1
2286
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%23%5%
1528
16th to endNight
42%10%18%22%5%
1589
September1st to 15thNight
43%8%12%26%9%
1650
16th to endNight
39%5%14%26%13%
1834
October1st to 15thNight
47%7%12%21%9%1
1980
16th to endNight
55%7%12%18%6%
2201
November1st to 15thNight
55%8%12%16%6%
2453
16th to endNight
61%8%13%11%3
2520
December1st to 15thNight
63%9%10%13%2
2636
16th to endNight
70%8%7%10%3
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%23%31%18%1
60
16th to endDay
21%16%35%20%6%
133
February1st to 15thDay
17%18%30%22%8%1
236
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%422%31%20%3
344
16th to endDay
17%5%30%30%12%3
268
September1st to 15thDay
25%10%32%19%8%2
255
16th to endDay
18%18%32%20%7%2
249
October1st to 15thDay
19%16%29%19%10%4
225
16th to endDay
36%17%23%13%7%
240
November1st to 15thDay
30%14%26%17%7%2
235
16th to endDay
29%17%29%17%41
240
December1st to 15thDay
34%13%27%21%3
123
16th to endDay
23%31%31%12%1
64
January1st to 15thNight
24%18%32%18%5%
750
16th to endNight
20%17%33%21%6%
787
February1st to 15thNight
20%13%33%24%7%
704
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
21%216%35%22%2
528
16th to endNight
17%5%23%32%19%1
525
September1st to 15thNight
20%10%26%28%12%1
495
16th to endNight
20%11%29%26%10%
646
October1st to 15thNight
22%16%25%23%11%1
660
16th to endNight
31%15%24%20%7%
711
November1st to 15thNight
29%14%28%18%6%1
730
16th to endNight
25%19%28%18%6%1
750
December1st to 15thNight
28%21%31%14%4
750
16th to endNight
32%18%26%17%41
800
Page generated at 2017-08-13 14:16:37. Version ac04

Copyright 2017 A. Danko


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