Niagara Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Niagara Falls 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
32%
22938
12%
74976
9%
22889
37%
22889
15%
55270

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
11%
757
6%
2649
2%
757
16%
757
5%
2229
January11th to 20thNight
13%
760
3%
2506
2%
760
14%
760
4%
2207
January21st to endNight
17%
800
6%
2599
3%
800
20%
800
6%
2217
February1st to 10thNight
12%
720
5%
2340
1%
720
17%
720
5%
1972
February11th to 20thNight
16%
703
7%
2275
2%
700
21%
700
8%
1858
February21st to endNight
17%
592
7%
1856
2%
592
23%
592
9%
1510
March1st to 10thNight
23%
720
12%
1980
6%
720
28%
720
15%
1532
March11th to 20thNight
25%
720
15%
1980
8%
720
32%
720
16%
1500
March21st to endNight
31%
792
17%
2178
9%
792
37%
792
19%
1599
April1st to 10thNight
26%
720
13%
1823
5%
720
31%
720
18%
1392
April11th to 20thNight
31%
696
16%
1760
7%
696
36%
696
23%
1272
April21st to endNight
36%
540
16%
1620
9%
540
42%
540
20%
1143
May1st to 10thNight
42%
540
14%
1620
10%
540
45%
540
21%
1132
May11th to 20thNight
44%
372
19%
1434
17%
372
52%
372
21%
883
May21st to endNight
53%
388
16%
1551
18%
388
59%
388
23%
910
June1st to 10thNight
45%
360
14%
1440
15%
360
54%
360
20%
915
June11th to 20thNight
49%
360
15%
1440
18%
360
56%
360
22%
856
June21st to endNight
51%
360
13%
1440
17%
360
56%
360
21%
847
July1st to 10thNight
60%
350
17%
1400
24%
350
65%
350
30%
733
July11th to 20thNight
56%
348
17%
1392
23%
348
60%
348
26%
778
July21st to endNight
60%
572
15%
1655
13%
541
63%
541
30%
1022
August1st to 10thNight
66%
537
17%
1600
16%
534
67%
534
31%
971
August11th to 20thNight
60%
534
18%
1598
14%
534
62%
534
30%
1003
August21st to endNight
57%
697
20%
1885
12%
697
60%
697
33%
1206
September1st to 10thNight
54%
720
16%
1800
8%
720
56%
720
31%
1212
September11th to 20thNight
58%
720
25%
1881
17%
720
61%
720
35%
1175
September21st to endNight
48%
720
18%
2029
14%
720
50%
720
24%
1393
October1st to 10thNight
41%
720
15%
2160
14%
720
45%
720
21%
1491
October11th to 20thNight
28%
720
10%
2160
8%
720
33%
720
15%
1605
October21st to endNight
24%
792
12%
2376
8%
792
30%
792
12%
1845
November1st to 10thNight
33%
740
17%
2428
13%
740
39%
740
18%
1658
November11th to 20thNight
22%
760
12%
2660
8%
760
29%
760
12%
1932
November21st to endNight
20%
760
7%
2660
5%
760
25%
760
9%
2079
December1st to 10thNight
15%
760
4%
2660
2%
760
16%
760
5%
2263
December11th to 20thNight
14%
760
4%
3263
2%
759
18%
759
4%
2702
December21st to endNight
11%
828
2%
4878
1%
817
15%
817
3%
4228

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
15%10%47%6%35%5%5%7%32%
74739
Night
16%10%47%6%45%5%5%6%31%
75188
TransparencyDay
50%8%13%18%9%1
74455
Night
53%8%12%16%9%1
75007
SeeingDay
20%11%26%24%14%5%
13398
Night
22%11%27%27%12%2
22950

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
16%16%6%12%9%5%6%5%5%6%14%
1517
11th to 20thDay
17%18%7%13%9%45%445%14%
1672
21st to endDay
14%16%7%12%13%7%6%445%12%
1791
February1st to 10thDay
19%16%5%12%9%5%5%445%15%
1620
11th to 20thDay
13%17%7%14%9%46%44418%
1573
21st to endDay
20%14%5%11%10%3445%5%19%
1394
March1st to 10thDay
16%10%6%12%8%45%45%425%
1977
11th to 20thDay
14%16%47%6%35%347%31%
1980
21st to endDay
20%11%47%7%345%46%31%
2178
April1st to 10thDay
17%13%47%5%44346%32%
2136
11th to 20thDay
20%8%36%5%3445%7%35%
2164
21st to endDay
20%8%37%6%35%446%34%
2340
May1st to 10thDay
16%9%37%6%45%5%5%7%35%
2340
11th to 20thDay
15%7%36%6%35%46%7%38%
2457
21st to endDay
11%5%25%5%35%5%7%8%45%
2725
June1st to 10thDay
14%6%35%5%35%46%8%40%
2520
11th to 20thDay
11%6%25%6%35%5%7%9%40%
2520
21st to endDay
14%5%25%435%5%6%9%43%
2520
July1st to 10thDay
6%4245%35%6%6%10%49%
2520
11th to 20thDay
12%5%25%5%46%6%7%10%37%
2520
21st to endDay
10%5%26%6%46%6%8%10%38%
2563
August1st to 10thDay
9%5%25%5%45%6%8%11%42%
2327
11th to 20thDay
9%5%35%6%46%6%8%11%38%
2303
21st to endDay
11%6%26%4345%6%9%44%
2452
September1st to 10thDay
14%7%25%5%345%7%8%41%
2160
11th to 20thDay
11%6%25%5%35%5%6%8%45%
2075
21st to endDay
13%7%36%6%45%6%7%8%34%
1931
October1st to 10thDay
20%8%26%6%35%447%35%
1800
11th to 20thDay
20%10%38%6%35%5%5%6%29%
1800
21st to endDay
25%13%48%7%35%436%22%
1980
November1st to 10thDay
15%9%47%7%45%45%7%33%
1646
11th to 20thDay
16%10%5%6%7%45%5%5%7%30%
1520
21st to endDay
21%14%48%7%35%45%7%23%
1520
December1st to 10thDay
18%17%6%10%8%45%5%5%5%17%
1520
11th to 20thDay
19%17%7%11%7%35%5%5%6%16%
1906
21st to endDay
27%20%7%10%6%4433412%
2772
January1st to 10thNight
17%17%7%11%8%46%5%4419%
2649
11th to 20thNight
19%17%7%12%9%45%445%14%
2506
21st to endNight
14%15%7%12%9%6%6%5%45%17%
2599
February1st to 10thNight
19%15%7%11%7%45%45%5%19%
2340
11th to 20thNight
16%14%5%11%7%46%5%5%5%22%
2273
21st to endNight
19%12%6%11%8%45%445%20%
1856
March1st to 10thNight
14%11%5%8%8%46%5%5%5%29%
1970
11th to 20thNight
18%12%38%6%3445%6%32%
1979
21st to endNight
17%10%49%5%34445%35%
2178
April1st to 10thNight
19%9%48%7%34446%32%
1823
11th to 20thNight
18%7%36%6%45%45%5%37%
1760
21st to endNight
16%9%5%5%5%35%6%5%6%35%
1620
May1st to 10thNight
16%9%37%5%35%5%6%7%35%
1620
11th to 20thNight
13%6%36%5%36%5%6%7%40%
1433
21st to endNight
11%5%245%35%5%6%7%45%
1550
June1st to 10thNight
11%5%37%6%5%5%7%7%7%37%
1440
11th to 20thNight
10%5%25%6%45%5%6%7%43%
1440
21st to endNight
12%5%246%45%5%5%8%43%
1440
July1st to 10thNight
6%5%25%6%3445%8%54%
1440
11th to 20thNight
10%5%25%5%345%6%9%45%
1440
21st to endNight
10%425%5%35%5%7%8%46%
1752
August1st to 10thNight
8%5%15%445%5%6%9%46%
1611
11th to 20thNight
8%6%36%5%35%5%7%8%45%
1598
21st to endNight
8%426%5%35%6%5%8%47%
1885
September1st to 10thNight
14%7%25%5%35%35%7%44%
1800
11th to 20thNight
13%42442445%6%52%
1881
21st to endNight
16%6%36%6%35%5%6%7%38%
2029
October1st to 10thNight
17%7%35%6%345%5%7%38%
2160
11th to 20thNight
21%10%36%6%35%45%5%30%
2160
21st to endNight
26%9%36%6%35%5%5%5%27%
2376
November1st to 10thNight
16%9%35%5%35%446%39%
2428
11th to 20thNight
15%10%47%7%45%5%5%7%31%
2660
21st to endNight
19%13%6%8%6%45%5%5%6%24%
2660
December1st to 10thNight
21%17%6%9%6%4445%6%18%
2660
11th to 20thNight
16%18%6%10%7%35%45%5%20%
3288
21st to endNight
29%16%6%8%7%35%45%5%12%
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
70%9%9%9%2
1518
11th to 20thDay
73%9%9%7%1
1672
21st to endDay
76%6%10%6%2
1791
February1st to 10thDay
72%8%9%9%1
1620
11th to 20thDay
71%8%8%10%3
1582
21st to endDay
68%7%11%9%5%
1394
March1st to 10thDay
61%8%12%14%5%1
1980
11th to 20thDay
52%7%14%16%10%1
1980
21st to endDay
54%7%8%20%9%2
2178
April1st to 10thDay
54%6%12%18%9%1
2136
11th to 20thDay
48%7%11%19%13%2
2164
21st to endDay
50%6%12%18%12%2
2340
May1st to 10thDay
47%7%11%22%11%2
2340
11th to 20thDay
43%10%11%22%12%2
2461
21st to endDay
36%8%17%23%14%2
2725
June1st to 10thDay
40%9%14%21%15%2
2520
11th to 20thDay
39%7%15%25%14%1
2520
21st to endDay
36%9%15%24%15%1
2520
July1st to 10thDay
28%10%15%25%19%3
2450
11th to 20thDay
37%10%17%25%11%
2445
21st to endDay
38%10%17%21%12%1
2420
August1st to 10thDay
34%9%19%25%12%1
2314
11th to 20thDay
38%10%17%24%10%1
2303
21st to endDay
36%7%15%28%12%2
2452
September1st to 10thDay
39%8%16%25%11%1
2160
11th to 20thDay
35%8%15%27%14%1
2075
21st to endDay
44%8%17%21%9%1
1931
October1st to 10thDay
49%7%14%17%11%1
1800
11th to 20thDay
55%9%15%16%6%1
1800
21st to endDay
65%6%11%12%5%1
1980
November1st to 10thDay
52%9%12%18%8%1
1646
11th to 20thDay
54%8%17%14%6%1
1520
21st to endDay
63%8%14%11%3
1520
December1st to 10thDay
70%10%13%7%1
1520
11th to 20thDay
68%12%12%7%2
1906
21st to endDay
77%8%9%5%1
2772
January1st to 10thNight
69%9%10%9%3
2649
11th to 20thNight
74%9%10%6%1
2506
21st to endNight
70%9%11%8%3
2599
February1st to 10thNight
69%8%10%10%2
2340
11th to 20thNight
65%8%12%11%4
2275
21st to endNight
65%7%11%11%5%
1856
March1st to 10thNight
56%8%13%16%6%1
1980
11th to 20thNight
54%7%10%18%10%1
1980
21st to endNight
53%6%8%20%12%2
2178
April1st to 10thNight
54%6%9%19%10%1
1823
11th to 20thNight
47%7%10%20%14%2
1760
21st to endNight
48%7%11%18%13%2
1620
May1st to 10thNight
46%8%9%19%15%3
1620
11th to 20thNight
41%7%12%23%14%2
1434
21st to endNight
35%9%13%22%17%3
1551
June1st to 10thNight
43%8%11%20%17%1
1440
11th to 20thNight
36%9%13%21%18%2
1440
21st to endNight
38%8%16%21%17%2
1440
July1st to 10thNight
29%7%13%26%21%4
1400
11th to 20thNight
34%7%15%26%16%2
1392
21st to endNight
34%8%16%22%16%3
1655
August1st to 10thNight
31%11%18%27%13%1
1600
11th to 20thNight
34%10%16%28%12%
1598
21st to endNight
34%9%14%29%13%2
1885
September1st to 10thNight
38%7%17%22%14%2
1800
11th to 20thNight
33%7%13%29%17%1
1881
21st to endNight
43%9%13%22%13%
2029
October1st to 10thNight
45%9%12%19%14%1
2160
11th to 20thNight
54%8%14%17%8%1
2160
21st to endNight
60%7%12%12%8%1
2376
November1st to 10thNight
47%8%12%21%11%2
2428
11th to 20thNight
53%8%15%16%7%1
2660
21st to endNight
60%10%15%13%2
2660
December1st to 10thNight
69%10%12%7%2
2660
11th to 20thNight
67%9%12%9%2
3288
21st to endNight
74%10%11%5%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
24%17%34%16%6%2
180
11th to 20thDay
27%25%30%14%32
252
21st to endDay
21%21%34%18%5%1
267
February1st to 10thDay
33%18%37%11%1
240
11th to 20thDay
26%23%38%13%1
240
21st to endDay
37%16%33%13%2
238
March1st to 10thDay
24%15%35%19%6%
420
11th to 20thDay
24%13%33%23%6%1
420
21st to endDay
28%13%29%21%7%2
462
April1st to 10thDay
20%15%34%23%8%1
420
11th to 20thDay
28%11%27%19%10%4
412
21st to endDay
27%8%30%23%9%3
420
May1st to 10thDay
24%9%27%23%13%5%
423
11th to 20thDay
18%6%24%28%18%6%
447
21st to endDay
13%6%24%30%19%9%
485
June1st to 10thDay
14%8%26%34%15%3
450
11th to 20thDay
14%7%23%28%23%4
450
21st to endDay
14%6%27%31%17%4
450
July1st to 10thDay
9%317%33%28%10%
445
11th to 20thDay
14%6%18%29%22%11%
444
21st to endDay
13%423%33%21%6%
488
August1st to 10thDay
11%219%32%23%13%
446
11th to 20thDay
10%6%16%31%25%11%
439
21st to endDay
12%7%19%30%21%11%
495
September1st to 10thDay
14%7%22%26%21%11%
450
11th to 20thDay
11%6%19%24%23%16%
450
21st to endDay
15%10%26%22%19%8%
450
October1st to 10thDay
23%12%21%18%16%9%
450
11th to 20thDay
26%16%30%20%7%2
450
21st to endDay
35%12%27%17%8%
495
November1st to 10thDay
21%20%27%21%9%2
302
11th to 20thDay
22%26%26%19%5%2
180
21st to endDay
30%16%34%14%6%
180
December1st to 10thDay
28%19%35%11%6%1
180
11th to 20thDay
28%26%30%13%3
180
21st to endDay
26%27%33%12%3
198
January1st to 10thNight
29%20%32%14%6%
760
11th to 20thNight
31%16%30%19%4
760
21st to endNight
22%15%34%24%5%
800
February1st to 10thNight
26%20%32%19%3
720
11th to 20thNight
24%18%34%19%5%
703
21st to endNight
28%15%33%22%3
592
March1st to 10thNight
22%12%35%24%7%
720
11th to 20thNight
24%16%28%24%6%1
720
21st to endNight
21%9%31%28%11%1
792
April1st to 10thNight
24%13%30%27%5%
720
11th to 20thNight
21%10%32%26%10%1
696
21st to endNight
22%7%27%32%11%1
540
May1st to 10thNight
20%6%24%33%15%3
540
11th to 20thNight
16%5%26%41%11%1
372
21st to endNight
12%6%23%37%20%3
389
June1st to 10thNight
15%332%34%16%1
360
11th to 20thNight
13%5%25%38%18%1
360
21st to endNight
12%6%23%43%15%1
360
July1st to 10thNight
9%319%41%26%2
350
11th to 20thNight
11%322%41%21%3
348
21st to endNight
12%318%43%22%2
572
August1st to 10thNight
11%412%38%30%5%
537
11th to 20thNight
10%317%34%31%5%
534
21st to endNight
12%319%37%25%4
697
September1st to 10thNight
15%418%34%25%4
720
11th to 20thNight
15%417%30%26%8%
720
21st to endNight
18%6%20%30%20%5%
720
October1st to 10thNight
20%8%23%27%19%3
720
11th to 20thNight
28%13%26%24%8%1
720
21st to endNight
33%12%24%25%5%
792
November1st to 10thNight
23%11%28%25%11%1
740
11th to 20thNight
24%16%32%18%9%1
760
21st to endNight
28%15%31%20%6%
760
December1st to 10thNight
34%18%27%17%4
760
11th to 20thNight
26%20%32%18%5%1
760
21st to endNight
32%17%31%18%3
836
Page generated at 2024-01-19 09:28:32. Version ac07

Copyright 2024 Attilla Danko


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