Upper Gagetown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Upper Gagetown clear sky chart from 2005-11-05 to 2017-09-19.

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
23%
14833
14%
46777
6%
14793
32%
14793
16%
33165

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
15%
745
13%
2653
2%
741
29%
741
11%
1859
January16th to endNight
18%
768
15%
2589
4%
768
32%
768
14%
1775
February1st to 15thNight
20%
704
12%
2286
4%
701
31%
701
14%
1610
February16th to endNight
18%
631
12%
1988
3%
631
29%
631
12%
1473
March1st to 15thNight
18%
720
16%
2031
6%
720
29%
720
15%
1488
March16th to endNight
20%
768
17%
2112
5%
768
29%
768
16%
1550
April1st to 15thNight
19%
596
14%
1770
5%
596
27%
596
14%
1310
April16th to endNight
22%
540
15%
1620
7%
540
30%
540
17%
1151
May1st to 15thNight
22%
540
11%
1584
5%
540
29%
540
15%
1190
May16th to endNight
19%
528
10%
1463
2%
527
27%
527
14%
1129
June1st to 15thNight
24%
360
7%
1260
3%
360
29%
360
12%
936
June16th to endNight
30%
360
7%
1260
4%
360
34%
360
15%
912
July1st to 15thNight
37%
340
10%
1190
8%
340
43%
340
21%
780
July16th to endNight
33%
457
9%
1422
7%
429
37%
429
15%
1043
August1st to 15thNight
38%
539
9%
1608
8%
535
40%
535
20%
1124
August16th to endNight
40%
573
18%
1719
10%
573
45%
573
28%
1080
September1st to 15thNight
30%
609
15%
1866
7%
609
38%
609
22%
1245
September16th to endNight
37%
673
24%
1858
13%
673
47%
673
30%
1148
October1st to 15thNight
29%
660
20%
1966
8%
660
40%
660
22%
1309
October16th to endNight
20%
704
15%
2172
4%
704
31%
704
15%
1566
November1st to 15thNight
24%
718
15%
2385
7%
718
33%
718
16%
1658
November16th to endNight
22%
750
14%
2520
5%
750
32%
750
12%
1789
December1st to 15thNight
14%
750
14%
2575
4%
750
26%
750
11%
1881
December16th to endNight
12%
800
12%
2880
3%
800
24%
800
9%
2159

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%8%35%5%3445%6%33%
48043
Night
19%8%36%5%3445%6%33%
46943
TransparencyDay
50%5%11%19%10%1
47729
Night
51%5%11%20%9%
46777
SeeingDay
26%13%29%20%8%1
6899
Night
24%13%32%22%6%
14833

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
15%13%46%5%2435%5%32%
1283
16th to endDay
14%11%46%6%34445%34%
1634
February1st to 15thDay
13%11%45%436%6%47%32%
1575
16th to endDay
15%11%46%8%345%5%430%
1485
March1st to 15thDay
18%11%5%6%5%25%34431%
1918
16th to endDay
15%9%38%6%34446%33%
2112
April1st to 15thDay
20%10%46%5%2445%5%30%
2175
16th to endDay
24%6%3442325%5%36%
2340
May1st to 15thDay
23%8%37%5%34446%29%
2368
16th to endDay
23%7%36%6%24446%29%
2660
June1st to 15thDay
25%7%36%5%33446%26%
2700
16th to endDay
24%6%35%5%345%5%8%28%
2700
July1st to 15thDay
15%5%24435%6%6%9%36%
2700
16th to endDay
16%5%36%6%36%5%6%8%31%
2629
August1st to 15thDay
17%6%26%6%25%45%6%34%
2340
16th to endDay
12%5%25%6%35%5%5%8%40%
2483
September1st to 15thDay
15%5%245%3445%6%43%
2093
16th to endDay
16%5%23313345%50%
1848
October1st to 15thDay
19%7%24324346%41%
1664
16th to endDay
22%7%36%6%34346%32%
1697
November1st to 15thDay
22%8%35%424346%34%
1472
16th to endDay
20%9%36%5%35%345%31%
1440
December1st to 15thDay
24%10%35%335%336%29%
1383
16th to endDay
22%12%45%6%23246%27%
1344
January1st to 15thNight
16%9%37%5%3446%6%32%
2653
16th to endNight
13%11%46%6%3445%7%32%
2589
February1st to 15thNight
14%11%36%6%345%5%6%32%
2285
16th to endNight
16%13%5%7%5%245%4429%
1988
March1st to 15thNight
19%10%36%5%2445%5%32%
2019
16th to endNight
18%9%47%5%3444433%
2112
April1st to 15thNight
23%10%26%5%24445%29%
1770
16th to endNight
24%7%25%424345%34%
1620
May1st to 15thNight
24%7%36%5%2445%6%28%
1584
16th to endNight
20%9%47%5%45%445%27%
1461
June1st to 15thNight
27%6%36%4345%48%25%
1260
16th to endNight
22%6%26%5%35%5%36%31%
1260
July1st to 15thNight
13%5%36%5%45%5%7%8%36%
1260
16th to endNight
17%7%36%6%36%5%6%8%28%
1521
August1st to 15thNight
16%5%36%5%345%5%7%34%
1620
16th to endNight
12%5%26%5%2346%7%42%
1719
September1st to 15thNight
18%6%25%424437%39%
1866
16th to endNight
14%42342335%6%49%
1858
October1st to 15thNight
18%7%25%423347%39%
1966
16th to endNight
22%8%35%5%23345%33%
2172
November1st to 15thNight
21%7%35%5%25%346%34%
2385
16th to endNight
20%10%45%5%33345%33%
2520
December1st to 15thNight
25%9%36%424345%29%
2575
16th to endNight
25%10%45%6%33345%26%
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
53%5%14%17%8%1
1284
16th to endDay
51%410%21%11%
1634
February1st to 15thDay
50%6%12%20%8%1
1578
16th to endDay
55%6%10%18%8%1
1485
March1st to 15thDay
57%39%16%10%2
1929
16th to endDay
51%410%18%12%2
2112
April1st to 15thDay
55%48%16%13%2
2175
16th to endDay
50%39%18%13%3
2340
May1st to 15thDay
55%5%8%18%9%1
2368
16th to endDay
54%6%11%19%6%
2664
June1st to 15thDay
59%5%10%15%8%1
2700
16th to endDay
54%7%12%17%8%
2700
July1st to 15thDay
41%9%14%20%12%
2541
16th to endDay
48%8%15%19%7%
2468
August1st to 15thDay
48%7%13%21%8%
2327
16th to endDay
39%8%15%26%9%
2483
September1st to 15thDay
40%6%13%25%12%1
2093
16th to endDay
36%49%30%17%1
1848
October1st to 15thDay
44%412%26%11%
1664
16th to endDay
53%411%20%8%
1697
November1st to 15thDay
51%5%12%16%13%
1472
16th to endDay
55%414%16%9%
1440
December1st to 15thDay
58%411%19%5%
1383
16th to endDay
58%49%16%9%
1344
January1st to 15thNight
50%7%13%18%8%1
2653
16th to endNight
49%5%12%22%10%
2589
February1st to 15thNight
51%5%13%18%10%
2286
16th to endNight
56%5%10%15%10%2
1988
March1st to 15thNight
53%48%19%11%2
2031
16th to endNight
54%37%19%13%1
2112
April1st to 15thNight
56%48%15%12%3
1770
16th to endNight
52%48%17%15%1
1620
May1st to 15thNight
56%5%10%17%8%1
1584
16th to endNight
57%7%11%15%7%
1463
June1st to 15thNight
57%6%11%17%5%1
1260
16th to endNight
53%7%13%17%8%
1260
July1st to 15thNight
42%8%16%23%8%
1190
16th to endNight
52%8%12%17%8%
1422
August1st to 15thNight
46%8%15%21%8%
1608
16th to endNight
37%6%17%28%9%
1719
September1st to 15thNight
43%6%10%25%12%
1866
16th to endNight
35%412%31%15%
1858
October1st to 15thNight
44%410%26%13%
1966
16th to endNight
52%5%9%21%10%
2172
November1st to 15thNight
51%414%19%9%1
2385
16th to endNight
52%6%13%18%8%
2520
December1st to 15thNight
57%49%22%6%
2575
16th to endNight
60%49%17%7%
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
26%20%35%16%1
60
16th to endDay
19%17%39%15%7%
162
February1st to 15thDay
22%11%37%22%5%
236
16th to endDay
23%22%29%19%4
223
March1st to 15thDay
26%20%31%16%5%
270
16th to endDay
26%18%26%18%6%3
288
April1st to 15thDay
31%23%23%16%31
270
16th to endDay
30%15%31%11%8%2
270
May1st to 15thDay
34%15%26%14%7%1
324
16th to endDay
30%13%29%18%7%
519
June1st to 15thDay
32%13%25%22%5%1
495
16th to endDay
28%8%33%19%9%1
495
July1st to 15thDay
22%8%30%22%13%1
475
16th to endDay
19%5%32%30%10%1
396
August1st to 15thDay
21%7%31%24%11%3
313
16th to endDay
16%10%25%27%17%3
332
September1st to 15thDay
19%10%29%28%9%3
315
16th to endDay
16%10%35%21%11%4
266
October1st to 15thDay
28%10%23%17%15%3
228
16th to endDay
27%18%33%11%7%
240
November1st to 15thDay
30%15%27%15%9%2
235
16th to endDay
27%19%28%17%6%
240
December1st to 15thDay
32%16%28%19%3
183
16th to endDay
39%20%29%10%
64
January1st to 15thNight
24%17%33%19%4
745
16th to endNight
21%18%32%22%4
768
February1st to 15thNight
21%17%32%23%4
704
16th to endNight
26%19%29%19%4
631
March1st to 15thNight
26%15%33%20%2
720
16th to endNight
23%16%32%20%5%
768
April1st to 15thNight
28%15%31%19%4
596
16th to endNight
29%12%32%19%6%
540
May1st to 15thNight
27%13%31%20%5%
540
16th to endNight
25%14%34%20%4
528
June1st to 15thNight
29%9%32%23%4
360
16th to endNight
25%6%32%26%6%
360
July1st to 15thNight
16%436%34%8%
340
16th to endNight
21%432%31%9%
457
August1st to 15thNight
19%5%29%30%14%
539
16th to endNight
13%7%33%32%12%
573
September1st to 15thNight
22%10%32%24%10%
609
16th to endNight
17%10%31%27%12%
673
October1st to 15thNight
22%10%32%23%9%1
660
16th to endNight
28%16%31%18%5%
704
November1st to 15thNight
27%12%31%21%7%
718
16th to endNight
25%18%29%19%6%
750
December1st to 15thNight
32%16%31%16%3
750
16th to endNight
33%17%30%15%3
800
Page generated at 2017-09-20 05:49:54. Version ac04

Copyright 2017 A. Danko


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