Gananoque
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gananoque clear sky chart from 2005-11-06 to 2024-01-22.

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
28%
22726
8%
74881
5%
22685
32%
22685
8%
61269

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%
760
4%
2649
2%
757
17%
757
3%
2364
January11th to 20thNight
16%
760
4%
2660
2%
760
18%
760
3%
2392
January21st to endNight
22%
800
7%
2672
3%
800
27%
800
6%
2262
February1st to 10thNight
12%
720
4%
2340
1%
720
15%
720
5%
2048
February11th to 20thNight
16%
703
9%
2268
3%
700
24%
700
6%
1904
February21st to endNight
18%
592
9%
1776
3%
592
24%
592
7%
1499
March1st to 10thNight
21%
720
9%
2134
5%
720
26%
720
9%
1762
March11th to 20thNight
24%
720
9%
1980
4%
720
29%
720
9%
1644
March21st to endNight
25%
792
12%
2079
5%
792
30%
792
12%
1694
April1st to 10thNight
21%
720
11%
1800
3%
720
25%
720
12%
1476
April11th to 20thNight
25%
711
10%
1775
3%
711
29%
711
11%
1477
April21st to endNight
27%
664
10%
1744
4%
664
29%
664
11%
1426
May1st to 10thNight
34%
360
12%
1440
9%
360
40%
360
9%
1093
May11th to 20thNight
36%
354
15%
1416
12%
354
45%
354
12%
1026
May21st to endNight
39%
388
11%
1551
12%
388
46%
388
11%
1135
June1st to 10thNight
36%
360
7%
1440
6%
360
43%
360
9%
1125
June11th to 20thNight
41%
360
11%
1440
14%
360
48%
360
12%
1027
June21st to endNight
41%
360
7%
1440
9%
360
46%
360
9%
1111
July1st to 10thNight
47%
350
9%
1400
10%
350
52%
350
12%
1019
July11th to 20thNight
53%
348
10%
1392
11%
348
58%
348
12%
1009
July21st to endNight
49%
394
11%
1486
10%
372
54%
372
12%
1103
August1st to 10thNight
52%
452
9%
1516
7%
450
55%
450
13%
1150
August11th to 20thNight
49%
547
13%
1611
7%
547
53%
547
17%
1205
August21st to endNight
45%
792
9%
1980
4%
792
48%
792
16%
1569
September1st to 10thNight
46%
720
10%
1800
3%
720
49%
720
16%
1414
September11th to 20thNight
51%
720
15%
1800
7%
720
54%
720
18%
1382
September21st to endNight
42%
720
12%
2041
9%
720
44%
720
13%
1612
October1st to 10thNight
31%
720
9%
2160
6%
720
36%
720
9%
1761
October11th to 20thNight
27%
720
7%
2160
4%
720
32%
720
9%
1808
October21st to endNight
20%
792
6%
2484
3%
792
24%
792
6%
2132
November1st to 10thNight
25%
740
10%
2407
7%
740
30%
740
9%
1930
November11th to 20thNight
21%
760
12%
2631
8%
760
28%
760
8%
2119
November21st to endNight
18%
760
6%
2660
3%
760
21%
760
4%
2326
December1st to 10thNight
15%
760
3%
2660
1%
760
17%
760
3%
2375
December11th to 20thNight
14%
759
7%
3253
3%
759
19%
759
4%
2735
December21st to endNight
12%
828
2%
4836
1%
817
14%
817
2%
4155

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
17%9%47%6%35%5%5%7%33%
74799
Night
18%10%47%6%3445%6%32%
75135
TransparencyDay
33%38%8%13%6%1
74504
Night
36%38%8%12%6%1
74964
SeeingDay
23%14%30%21%10%3
13439
Night
24%13%29%24%9%1
22736

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
19%16%5%9%8%35%5%45%22%
1517
11th to 20thDay
19%17%6%9%6%4443423%
1520
21st to endDay
14%14%7%10%9%46%5%45%21%
1716
February1st to 10thDay
17%16%5%11%7%46%5%45%20%
1620
11th to 20thDay
16%14%6%9%6%46%45%426%
1578
21st to endDay
21%14%5%8%8%5%5%445%23%
1480
March1st to 10thDay
15%12%5%11%8%45%43429%
1821
11th to 20thDay
17%12%5%8%6%35%445%30%
1980
21st to endDay
22%10%36%5%2333437%
2276
April1st to 10thDay
20%11%46%5%34436%33%
2160
11th to 20thDay
21%6%45%5%34446%39%
2134
21st to endDay
21%10%47%4345%45%32%
2231
May1st to 10thDay
18%8%46%6%35%45%7%34%
2520
11th to 20thDay
16%6%35%5%35%46%8%39%
2478
21st to endDay
14%5%36%5%35%5%6%9%39%
2725
June1st to 10thDay
19%8%36%5%35%5%5%8%34%
2520
11th to 20thDay
16%6%245%35%6%5%8%40%
2520
21st to endDay
16%7%36%5%35%5%5%8%36%
2520
July1st to 10thDay
12%6%24435%5%6%9%44%
2520
11th to 20thDay
12%6%34435%5%8%9%41%
2520
21st to endDay
12%425%5%46%6%8%10%40%
2744
August1st to 10thDay
11%6%26%5%35%5%6%8%42%
2409
11th to 20thDay
11%5%25%5%36%6%8%10%39%
2272
21st to endDay
13%5%26%5%35%5%6%8%42%
2376
September1st to 10thDay
13%5%26%5%345%6%8%43%
2160
11th to 20thDay
11%6%25%5%25%45%7%47%
2160
21st to endDay
17%7%35%4345%6%6%39%
1917
October1st to 10thDay
22%7%36%5%24447%36%
1800
11th to 20thDay
20%10%38%6%45%45%7%30%
1800
21st to endDay
26%10%36%7%34445%27%
1872
November1st to 10thDay
16%8%47%6%345%6%8%32%
1671
11th to 20thDay
16%11%5%8%6%45%45%6%31%
1544
21st to endDay
22%13%48%6%445%6%6%22%
1520
December1st to 10thDay
25%14%6%10%6%3445%6%18%
1520
11th to 20thDay
22%15%6%9%7%33445%22%
1906
21st to endDay
28%16%6%9%6%3433419%
2772
January1st to 10thNight
21%17%5%10%7%35%5%4420%
2649
11th to 20thNight
18%16%6%10%8%45%445%21%
2660
21st to endNight
14%14%5%10%6%35%45%5%27%
2672
February1st to 10thNight
18%14%6%11%8%46%445%20%
2340
11th to 20thNight
16%13%5%9%7%44445%29%
2266
21st to endNight
20%12%49%6%445%5%427%
1776
March1st to 10thNight
16%14%5%8%6%44445%29%
2124
11th to 20thNight
19%13%5%7%5%33445%33%
1979
21st to endNight
20%10%47%5%33335%38%
2079
April1st to 10thNight
21%9%47%4345%45%35%
1800
11th to 20thNight
21%7%35%5%4445%6%37%
1775
21st to endNight
22%9%46%5%3445%7%31%
1744
May1st to 10thNight
23%7%35%5%445%5%7%35%
1440
11th to 20thNight
13%6%36%5%45%45%7%42%
1415
21st to endNight
11%6%35%5%345%6%9%43%
1550
June1st to 10thNight
16%6%36%7%35%5%6%9%33%
1440
11th to 20thNight
14%5%35%5%345%6%9%42%
1440
21st to endNight
18%6%35%5%35%5%5%9%36%
1440
July1st to 10thNight
9%5%345%35%5%5%7%47%
1440
11th to 20thNight
11%6%15%5%35%5%9%9%43%
1440
21st to endNight
10%5%35%5%3446%8%46%
1574
August1st to 10thNight
9%5%25%5%46%6%6%9%44%
1526
11th to 20thNight
11%7%35%6%2446%9%42%
1611
21st to endNight
11%5%26%5%345%6%8%44%
1980
September1st to 10thNight
12%6%26%5%2446%7%46%
1800
11th to 20thNight
14%6%25%42346%7%48%
1800
21st to endNight
16%6%25%5%3446%7%42%
2041
October1st to 10thNight
19%7%36%5%345%5%7%36%
2160
11th to 20thNight
20%7%46%7%45%45%6%32%
2160
21st to endNight
25%9%37%6%4345%5%28%
2484
November1st to 10thNight
19%9%36%5%2445%6%37%
2407
11th to 20thNight
18%10%36%5%35%5%5%8%32%
2631
21st to endNight
22%13%38%6%35%5%46%24%
2660
December1st to 10thNight
22%14%5%9%7%3445%5%20%
2660
11th to 20thNight
23%13%48%6%3445%5%27%
3288
21st to endNight
31%14%410%5%34445%16%
4884

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
41%42%6%9%1
1518
11th to 20thDay
44%40%5%7%41
1520
21st to endDay
41%39%6%8%41
1716
February1st to 10thDay
44%37%5%11%31
1620
11th to 20thDay
41%37%7%9%41
1587
21st to endDay
43%37%7%8%5%
1480
March1st to 10thDay
38%37%9%11%5%
1824
11th to 20thDay
37%37%10%10%5%
1980
21st to endDay
32%36%6%14%9%3
2276
April1st to 10thDay
33%36%7%14%8%2
2160
11th to 20thDay
30%37%6%15%10%1
2134
21st to endDay
36%37%6%10%8%3
2231
May1st to 10thDay
31%37%7%11%12%2
2520
11th to 20thDay
28%39%7%15%10%2
2482
21st to endDay
26%39%11%14%8%3
2725
June1st to 10thDay
33%38%9%12%7%
2520
11th to 20thDay
27%38%8%18%8%1
2520
21st to endDay
30%40%11%13%6%
2520
July1st to 10thDay
24%39%9%19%8%
2450
11th to 20thDay
25%39%12%18%6%
2445
21st to endDay
25%40%12%15%7%
2591
August1st to 10thDay
27%38%10%17%7%
2395
11th to 20thDay
23%38%13%18%8%
2272
21st to endDay
25%39%8%20%7%1
2376
September1st to 10thDay
27%38%9%18%8%
2160
11th to 20thDay
27%37%8%20%8%
2160
21st to endDay
32%38%8%17%6%
1917
October1st to 10thDay
33%37%8%14%8%
1800
11th to 20thDay
39%38%9%11%4
1800
21st to endDay
40%39%7%8%6%
1872
November1st to 10thDay
27%42%10%15%5%
1671
11th to 20thDay
35%41%8%8%6%2
1544
21st to endDay
42%42%7%6%3
1520
December1st to 10thDay
43%41%7%7%1
1520
11th to 20thDay
46%32%12%9%1
1906
21st to endDay
55%27%5%12%1
2772
January1st to 10thNight
45%40%6%6%2
2649
11th to 20thNight
45%41%46%3
2660
21st to endNight
40%38%5%10%5%1
2672
February1st to 10thNight
45%37%7%8%3
2340
11th to 20thNight
40%37%7%12%4
2268
21st to endNight
40%37%8%11%41
1776
March1st to 10thNight
38%36%9%13%5%
2134
11th to 20thNight
37%37%8%12%6%
1980
21st to endNight
34%36%5%12%11%2
2079
April1st to 10thNight
33%37%6%13%9%2
1800
11th to 20thNight
35%37%7%13%8%1
1775
21st to endNight
35%37%6%11%10%2
1744
May1st to 10thNight
31%37%5%11%12%4
1440
11th to 20thNight
27%36%8%14%12%3
1416
21st to endNight
25%39%9%14%11%2
1551
June1st to 10thNight
31%39%9%14%6%
1440
11th to 20thNight
25%38%11%15%11%1
1440
21st to endNight
30%40%10%14%7%
1440
July1st to 10thNight
23%40%9%16%10%1
1400
11th to 20thNight
25%39%9%19%8%
1392
21st to endNight
25%40%9%18%8%1
1486
August1st to 10thNight
27%39%10%17%8%
1516
11th to 20thNight
24%37%10%18%11%
1611
21st to endNight
26%39%10%17%8%
1980
September1st to 10thNight
26%39%8%19%8%1
1800
11th to 20thNight
24%37%11%20%8%
1800
21st to endNight
30%37%8%17%7%1
2041
October1st to 10thNight
34%38%7%13%7%1
2160
11th to 20thNight
38%37%9%12%4
2160
21st to endNight
40%39%8%7%6%1
2484
November1st to 10thNight
30%41%8%13%7%1
2407
11th to 20thNight
31%42%8%12%6%2
2631
21st to endNight
40%42%6%9%3
2660
December1st to 10thNight
44%41%7%7%1
2660
11th to 20thNight
44%35%7%11%4
3288
21st to endNight
56%27%7%9%1
4884

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
28%17%32%15%7%1
180
11th to 20thDay
31%20%31%14%41
180
21st to endDay
24%20%31%20%5%
234
February1st to 10thDay
33%26%32%8%1
240
11th to 20thDay
30%27%34%9%
245
21st to endDay
34%18%29%16%2
346
March1st to 10thDay
26%16%33%19%6%
420
11th to 20thDay
29%17%29%19%5%
420
21st to endDay
34%15%29%14%6%2
462
April1st to 10thDay
29%19%30%15%7%
420
11th to 20thDay
26%21%24%18%7%4
412
21st to endDay
30%13%32%15%8%2
420
May1st to 10thDay
23%14%33%18%9%2
423
11th to 20thDay
17%14%34%23%10%2
447
21st to endDay
19%11%32%22%13%2
485
June1st to 10thDay
22%10%35%21%9%2
450
11th to 20thDay
20%12%30%23%12%3
450
21st to endDay
18%13%32%25%10%2
450
July1st to 10thDay
13%9%26%31%17%3
445
11th to 20thDay
15%7%27%31%15%4
444
21st to endDay
12%11%33%32%11%1
488
August1st to 10thDay
12%8%30%28%18%4
446
11th to 20thDay
14%8%23%30%18%7%
439
21st to endDay
15%9%33%23%15%6%
495
September1st to 10thDay
16%8%30%28%12%6%
450
11th to 20thDay
12%8%28%25%18%10%
450
21st to endDay
20%10%25%26%16%3
450
October1st to 10thDay
28%14%22%18%13%5%
450
11th to 20thDay
24%21%29%16%7%2
450
21st to endDay
35%14%27%19%5%
441
November1st to 10thDay
25%20%29%18%7%1
365
11th to 20thDay
27%20%34%11%7%1
204
21st to endDay
27%23%35%11%41
180
December1st to 10thDay
38%14%27%17%3
180
11th to 20thDay
32%23%32%10%3
180
21st to endDay
32%21%27%17%3
198
January1st to 10thNight
32%18%27%18%5%
760
11th to 20thNight
30%18%29%19%41
760
21st to endNight
24%14%31%24%7%
800
February1st to 10thNight
26%23%33%17%2
720
11th to 20thNight
24%16%37%19%3
703
21st to endNight
28%14%34%21%2
592
March1st to 10thNight
26%14%32%24%4
720
11th to 20thNight
26%17%28%23%5%1
720
21st to endNight
24%12%33%23%7%
792
April1st to 10thNight
26%13%33%24%4
720
11th to 20thNight
25%15%32%21%7%
711
21st to endNight
28%11%28%23%9%1
664
May1st to 10thNight
26%9%27%26%10%2
360
11th to 20thNight
16%9%32%36%7%1
354
21st to endNight
14%10%31%30%14%1
389
June1st to 10thNight
21%6%26%35%10%1
360
11th to 20thNight
15%9%28%32%15%1
360
21st to endNight
17%7%28%35%13%
360
July1st to 10thNight
11%331%36%18%1
350
11th to 20thNight
12%5%23%36%22%2
348
21st to endNight
13%5%26%41%13%1
394
August1st to 10thNight
14%324%35%23%1
452
11th to 20thNight
16%5%20%32%23%4
547
21st to endNight
13%6%28%33%18%2
792
September1st to 10thNight
17%6%25%31%18%3
720
11th to 20thNight
16%7%21%29%23%5%
720
21st to endNight
17%10%26%25%19%2
720
October1st to 10thNight
26%13%26%17%16%2
720
11th to 20thNight
26%14%27%24%9%1
720
21st to endNight
34%11%29%21%5%
792
November1st to 10thNight
27%14%29%21%9%
740
11th to 20thNight
27%18%30%17%8%1
760
21st to endNight
33%18%27%16%6%
760
December1st to 10thNight
34%19%26%18%4
760
11th to 20thNight
30%19%31%17%21
760
21st to endNight
35%16%30%16%2
836
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