Ear Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ear Falls clear sky chart from 2005-11-06 to 2024-02-05.

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
30%
25225
10%
80817
6%
25137
35%
25137
15%
60831

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
22%
939
7%
4711
5%
926
27%
926
5%
3797
January11th to 20thNight
22%
941
4%
4748
3%
930
26%
930
6%
3890
January21st to endNight
23%
1036
5%
5084
4%
1023
27%
1023
5%
4227
February1st to 10thNight
29%
923
11%
2399
5%
923
33%
923
15%
1878
February11th to 20thNight
34%
878
17%
2274
8%
874
38%
874
21%
1684
February21st to endNight
31%
740
16%
1924
5%
740
38%
740
18%
1453
March1st to 10thNight
34%
673
15%
2115
10%
673
38%
673
17%
1530
March11th to 20thNight
25%
540
17%
1980
8%
540
39%
540
16%
1315
March21st to endNight
33%
594
18%
2129
16%
594
42%
594
17%
1428
April1st to 10thNight
36%
540
17%
1800
15%
540
45%
540
22%
1163
April11th to 20thNight
37%
533
17%
1639
10%
533
46%
533
21%
1110
April21st to endNight
32%
540
16%
1544
6%
540
40%
540
23%
1060
May1st to 10thNight
31%
540
15%
1440
5%
540
35%
540
21%
1036
May11th to 20thNight
38%
531
12%
1416
6%
531
41%
531
25%
967
May21st to endNight
34%
584
8%
1385
4%
582
37%
582
24%
1011
June1st to 10thNight
38%
540
3%
1260
2%
540
40%
540
25%
923
June11th to 20thNight
38%
540
2%
1260
1%
540
40%
540
30%
887
June21st to endNight
50%
540
1%
1260
2%
540
51%
540
34%
847
July1st to 10thNight
47%
525
6%
1225
5%
525
49%
525
41%
770
July11th to 20thNight
46%
522
7%
1218
4%
522
48%
522
38%
794
July21st to endNight
53%
591
13%
1344
7%
558
55%
558
38%
860
August1st to 10thNight
49%
537
15%
1423
6%
534
52%
534
34%
893
August11th to 20thNight
50%
534
15%
1580
8%
534
54%
534
29%
991
August21st to endNight
44%
594
16%
1802
13%
594
50%
594
25%
1175
September1st to 10thNight
41%
540
15%
1800
12%
540
48%
540
25%
1115
September11th to 20thNight
37%
540
13%
1811
11%
540
42%
540
19%
1233
September21st to endNight
33%
614
14%
2054
9%
614
41%
614
20%
1385
October1st to 10thNight
27%
720
13%
2160
7%
720
32%
720
16%
1607
October11th to 20thNight
25%
720
12%
2160
5%
720
30%
720
14%
1638
October21st to endNight
20%
877
7%
2606
3%
877
24%
877
10%
2121
November1st to 10thNight
20%
925
9%
2591
4%
925
25%
925
12%
2096
November11th to 20thNight
16%
950
7%
2660
2%
950
20%
950
8%
2285
November21st to endNight
13%
950
4%
2660
2%
950
15%
950
6%
2333
December1st to 10thNight
19%
950
6%
2812
3%
950
22%
950
7%
2413
December11th to 20thNight
18%
950
8%
3439
3%
949
23%
949
7%
2766
December21st to endNight
20%
1034
5%
5104
4%
1026
24%
1026
4%
4150

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
14%11%5%9%7%45%5%5%7%28%
77688
Night
12%12%5%10%8%46%5%5%6%26%
81206
TransparencyDay
55%5%12%20%7%1
77374
Night
58%5%11%18%7%1
81054
SeeingDay
20%12%32%24%10%2
15160
Night
20%9%30%28%12%1
25268

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
6%12%10%16%11%7%10%6%4414%
2218
11th to 20thDay
5%10%5%11%15%8%8%8%8%7%15%
2220
21st to endDay
8%18%8%19%10%5%5%7%5%411%
2568
February1st to 10thDay
6%12%5%10%10%5%10%9%6%7%21%
1656
11th to 20thDay
9%11%5%8%8%6%8%7%5%8%25%
1574
21st to endDay
5%11%8%13%10%5%6%6%6%6%24%
1332
March1st to 10thDay
9%15%48%7%46%5%36%31%
1856
11th to 20thDay
10%11%6%11%8%345%46%32%
1980
21st to endDay
14%11%48%8%45%5%5%6%31%
2227
April1st to 10thDay
11%13%48%6%45%45%6%34%
2160
11th to 20thDay
14%10%48%7%3446%6%34%
2267
21st to endDay
11%9%47%6%45%5%6%7%35%
2415
May1st to 10thDay
16%9%36%6%45%5%5%7%34%
2520
11th to 20thDay
18%10%47%5%35%45%7%33%
2479
21st to endDay
20%9%46%5%35%446%34%
2890
June1st to 10thDay
18%7%36%6%46%6%6%7%31%
2700
11th to 20thDay
18%8%36%6%445%6%7%32%
2700
21st to endDay
16%6%36%6%46%7%6%8%32%
2700
July1st to 10thDay
11%6%25%435%6%6%8%41%
2700
11th to 20thDay
15%6%35%5%46%6%6%9%36%
2700
21st to endDay
13%5%26%6%46%6%6%9%37%
2895
August1st to 10thDay
14%5%36%5%46%5%6%8%38%
2507
11th to 20thDay
12%5%36%6%35%6%6%8%41%
2318
21st to endDay
17%8%37%5%36%5%5%8%35%
2554
September1st to 10thDay
17%7%26%6%35%5%6%7%36%
2160
11th to 20thDay
22%9%36%6%445%5%6%29%
2147
21st to endDay
21%11%46%5%24446%33%
1887
October1st to 10thDay
22%17%47%5%44445%25%
1800
11th to 20thDay
19%18%6%8%6%35%446%21%
1800
21st to endDay
21%21%7%10%7%43435%16%
1746
November1st to 10thDay
16%19%8%12%8%44435%18%
1487
11th to 20thDay
14%19%10%13%10%5%6%33413%
1520
21st to endDay
16%17%6%18%11%44445%12%
1520
December1st to 10thDay
8%16%8%13%13%7%8%5%4413%
1364
11th to 20thDay
8%15%9%14%8%46%7%5%419%
1679
21st to endDay
14%13%9%11%8%45%6%6%9%16%
2442
January1st to 10thNight
5%15%8%14%12%8%8%6%5%5%14%
4737
11th to 20thNight
7%10%6%13%15%9%10%8%6%5%12%
4750
21st to endNight
8%20%9%16%8%46%6%5%5%12%
5094
February1st to 10thNight
6%12%6%10%8%5%11%9%6%7%21%
2399
11th to 20thNight
9%12%47%6%5%7%9%6%6%29%
2273
21st to endNight
5%11%8%11%8%5%7%6%6%6%27%
1924
March1st to 10thNight
9%12%5%8%7%5%6%5%5%6%32%
2104
11th to 20thNight
12%11%5%9%6%24446%37%
1979
21st to endNight
14%11%47%6%4445%6%35%
2129
April1st to 10thNight
14%10%37%6%3445%6%40%
1800
11th to 20thNight
13%9%46%6%46%446%38%
1639
21st to endNight
12%11%46%7%44445%40%
1544
May1st to 10thNight
18%8%36%6%45%5%5%7%34%
1440
11th to 20thNight
21%6%35%425%5%47%39%
1416
21st to endNight
21%8%35%6%25%45%6%35%
1384
June1st to 10thNight
19%7%35%5%35%5%7%9%33%
1260
11th to 20thNight
15%7%36%4345%5%8%39%
1260
21st to endNight
12%5%245%35%5%6%9%44%
1260
July1st to 10thNight
9%424425%5%7%9%48%
1260
11th to 20thNight
13%5%25%5%245%5%9%46%
1260
21st to endNight
9%425%5%346%5%7%49%
1423
August1st to 10thNight
11%5%25%5%345%6%9%45%
1432
11th to 20thNight
11%6%25%435%6%6%8%43%
1580
21st to endNight
15%7%26%5%34448%41%
1802
September1st to 10thNight
15%8%26%433447%44%
1800
11th to 20thNight
22%8%25%5%24446%37%
1811
21st to endNight
20%9%25%43445%7%36%
2054
October1st to 10thNight
18%13%46%6%35%5%5%6%30%
2160
11th to 20thNight
22%15%47%435%446%27%
2160
21st to endNight
21%18%5%10%7%35%445%19%
2606
November1st to 10thNight
17%17%7%11%7%34445%21%
2591
11th to 20thNight
16%15%7%14%10%5%6%44416%
2660
21st to endNight
15%18%8%15%11%5%6%5%3412%
2660
December1st to 10thNight
8%14%8%16%13%7%7%5%45%13%
2812
11th to 20thNight
9%14%8%14%10%5%6%6%5%6%17%
3518
21st to endNight
10%15%8%13%11%6%7%5%5%5%14%
5225

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
73%47%12%4
2219
11th to 20thDay
66%313%15%3
2220
21st to endDay
74%47%10%5%
2568
February1st to 10thDay
60%5%11%14%10%
1656
11th to 20thDay
57%49%22%8%
1583
21st to endDay
57%48%21%8%1
1332
March1st to 10thDay
55%413%16%11%1
1858
11th to 20thDay
54%410%22%9%1
1980
21st to endDay
54%5%10%21%8%2
2227
April1st to 10thDay
51%49%19%14%2
2160
11th to 20thDay
50%39%25%13%1
2267
21st to endDay
48%410%25%11%2
2415
May1st to 10thDay
49%5%9%24%11%1
2520
11th to 20thDay
51%49%22%11%2
2483
21st to endDay
52%410%20%12%2
2890
June1st to 10thDay
50%7%12%21%10%
2700
11th to 20thDay
50%5%12%19%13%1
2700
21st to endDay
48%7%15%22%7%
2700
July1st to 10thDay
37%6%15%30%11%
2626
11th to 20thDay
42%6%14%29%8%1
2619
21st to endDay
43%7%18%26%6%
2734
August1st to 10thDay
42%6%19%26%6%
2492
11th to 20thDay
39%8%21%27%5%
2318
21st to endDay
46%7%18%23%6%
2554
September1st to 10thDay
46%6%16%25%6%
2160
11th to 20thDay
55%5%15%22%3
2147
21st to endDay
53%416%22%5%
1887
October1st to 10thDay
63%5%12%17%3
1800
11th to 20thDay
65%411%17%3
1800
21st to endDay
72%412%11%1
1746
November1st to 10thDay
70%411%10%5%1
1487
11th to 20thDay
77%38%9%3
1520
21st to endDay
76%310%7%2
1520
December1st to 10thDay
74%39%11%3
1364
11th to 20thDay
65%6%8%17%4
1680
21st to endDay
65%49%17%6%
2442
January1st to 10thNight
71%49%13%3
4737
11th to 20thNight
72%411%10%3
4750
21st to endNight
73%5%9%9%4
5094
February1st to 10thNight
59%6%10%17%8%
2399
11th to 20thNight
52%5%10%23%9%
2274
21st to endNight
56%49%21%10%1
1924
March1st to 10thNight
54%410%17%13%1
2115
11th to 20thNight
50%311%23%10%3
1980
21st to endNight
50%410%21%11%3
2129
April1st to 10thNight
46%38%22%18%2
1800
11th to 20thNight
49%37%20%18%2
1639
21st to endNight
48%47%24%15%2
1544
May1st to 10thNight
50%48%23%13%1
1440
11th to 20thNight
46%310%23%16%2
1417
21st to endNight
49%5%9%20%14%3
1385
June1st to 10thNight
47%7%13%20%12%1
1260
11th to 20thNight
43%5%12%24%15%1
1260
21st to endNight
36%7%18%28%10%1
1260
July1st to 10thNight
29%6%15%34%14%1
1225
11th to 20thNight
34%5%19%31%9%2
1218
21st to endNight
33%6%17%34%10%
1344
August1st to 10thNight
34%6%17%32%9%1
1423
11th to 20thNight
36%7%18%31%7%
1580
21st to endNight
42%5%17%27%7%1
1802
September1st to 10thNight
41%5%16%29%9%
1800
11th to 20thNight
48%6%16%25%5%
1811
21st to endNight
48%5%18%24%5%
2054
October1st to 10thNight
56%6%12%22%5%
2160
11th to 20thNight
59%5%14%19%3
2160
21st to endNight
67%5%12%14%3
2606
November1st to 10thNight
67%312%15%3
2591
11th to 20thNight
73%48%11%3
2660
21st to endNight
78%310%8%2
2660
December1st to 10thNight
75%39%9%3
2812
11th to 20thNight
67%5%9%13%5%
3516
21st to endNight
71%46%14%4
5225

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
16%9%41%23%9%1
270
11th to 20thDay
12%8%37%31%11%1
270
21st to endDay
14%8%38%28%11%1
297
February1st to 10thDay
16%10%46%18%8%2
252
11th to 20thDay
15%17%33%20%13%2
240
21st to endDay
12%18%44%17%8%2
198
March1st to 10thDay
15%7%41%26%9%2
240
11th to 20thDay
15%16%40%24%5%
240
21st to endDay
20%12%38%20%9%1
313
April1st to 10thDay
19%14%33%24%9%1
420
11th to 20thDay
22%11%31%25%9%1
545
21st to endDay
16%14%35%25%9%1
600
May1st to 10thDay
20%16%33%24%6%1
603
11th to 20thDay
23%14%30%22%9%3
625
21st to endDay
24%11%32%24%8%2
679
June1st to 10thDay
21%13%30%23%10%3
630
11th to 20thDay
21%14%33%20%9%3
630
21st to endDay
18%10%28%27%14%3
630
July1st to 10thDay
12%13%34%26%12%4
621
11th to 20thDay
18%11%27%24%16%4
618
21st to endDay
13%6%29%31%15%6%
684
August1st to 10thDay
16%10%27%30%13%4
626
11th to 20thDay
15%9%27%29%16%4
615
21st to endDay
22%8%28%27%13%2
673
September1st to 10thDay
22%10%29%26%11%1
450
11th to 20thDay
28%10%32%23%7%
437
21st to endDay
30%14%32%19%4
270
October1st to 10thDay
34%10%25%21%10%
270
11th to 20thDay
25%15%34%19%7%
270
21st to endDay
36%15%30%16%3
297
November1st to 10thDay
26%16%34%18%6%1
270
11th to 20thDay
25%16%37%16%6%1
270
21st to endDay
25%21%39%11%4
270
December1st to 10thDay
17%12%36%24%8%2
270
11th to 20thDay
21%11%39%24%4
270
21st to endDay
17%9%34%25%12%2
297
January1st to 10thNight
15%11%35%27%10%2
950
11th to 20thNight
18%7%34%31%9%1
950
21st to endNight
17%8%34%31%9%1
1045
February1st to 10thNight
12%9%34%32%11%1
923
11th to 20thNight
15%9%32%27%15%1
879
21st to endNight
11%10%33%30%14%3
740
March1st to 10thNight
15%11%32%30%11%1
675
11th to 20thNight
18%13%34%24%10%1
540
21st to endNight
20%8%29%27%12%4
594
April1st to 10thNight
19%11%26%34%10%1
540
11th to 20thNight
18%8%30%28%14%1
533
21st to endNight
19%9%32%29%9%1
540
May1st to 10thNight
22%10%32%27%9%1
540
11th to 20thNight
26%6%25%29%13%1
531
21st to endNight
26%8%27%28%11%1
584
June1st to 10thNight
25%5%23%31%14%1
540
11th to 20thNight
19%7%30%31%13%1
540
21st to endNight
16%5%22%37%19%1
540
July1st to 10thNight
10%7%30%37%15%1
525
11th to 20thNight
14%5%28%33%18%2
522
21st to endNight
10%5%25%34%23%4
591
August1st to 10thNight
15%426%35%19%1
537
11th to 20thNight
15%5%23%34%20%3
534
21st to endNight
20%5%24%32%18%1
594
September1st to 10thNight
21%6%27%29%15%2
540
11th to 20thNight
27%6%24%29%12%2
540
21st to endNight
25%8%28%27%11%1
614
October1st to 10thNight
28%8%29%27%9%
720
11th to 20thNight
32%8%26%23%10%1
720
21st to endNight
29%11%28%24%7%1
877
November1st to 10thNight
24%12%30%22%9%2
925
11th to 20thNight
26%9%33%23%8%1
950
21st to endNight
27%15%31%21%5%1
950
December1st to 10thNight
15%10%37%26%10%1
950
11th to 20thNight
18%12%34%26%8%1
950
21st to endNight
20%10%30%28%10%2
1045
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