Jenny Jump State Forest
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jenny Jump State Forest clear sky chart from 2005-11-05 to 2017-05-01.

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
29%
14653
19%
45671
8%
14622
41%
14622
21%
29522

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
18%
720
18%
2506
7%
716
33%
716
15%
1625
January16th to endNight
14%
768
20%
2563
4%
768
33%
768
16%
1631
February1st to 15thNight
11%
704
16%
2259
2%
701
28%
701
13%
1514
February16th to endNight
16%
631
25%
1893
7%
631
38%
631
17%
1206
March1st to 15thNight
18%
720
18%
2116
6%
720
32%
720
17%
1407
March16th to endNight
19%
768
22%
2016
7%
768
32%
768
21%
1347
April1st to 15thNight
19%
718
16%
1796
4%
718
26%
718
19%
1270
April16th to endNight
26%
720
18%
1800
4%
720
33%
720
25%
1236
May1st to 15thNight
31%
439
19%
1435
9%
439
42%
439
18%
953
May16th to endNight
41%
342
14%
1369
12%
342
49%
342
19%
836
June1st to 15thNight
38%
330
14%
1320
12%
330
49%
330
16%
859
June16th to endNight
54%
330
15%
1320
16%
330
62%
330
26%
740
July1st to 15thNight
50%
310
14%
1240
15%
310
57%
310
20%
763
July16th to endNight
58%
348
15%
1306
16%
326
64%
326
27%
725
August1st to 15thNight
55%
516
19%
1497
13%
514
59%
514
33%
935
August16th to endNight
52%
700
17%
1750
9%
700
55%
700
31%
1182
September1st to 15thNight
44%
660
24%
1650
11%
660
50%
660
30%
1092
September16th to endNight
48%
657
26%
1785
17%
657
54%
657
34%
1113
October1st to 15thNight
37%
660
21%
1966
15%
660
46%
660
25%
1265
October16th to endNight
26%
704
21%
2172
8%
704
42%
704
24%
1364
November1st to 15thNight
30%
700
21%
2277
9%
700
46%
700
22%
1408
November16th to endNight
25%
720
20%
2427
10%
720
38%
720
18%
1551
December1st to 15thNight
19%
720
14%
2520
5%
720
31%
720
13%
1705
December16th to endNight
15%
768
17%
2688
3%
768
32%
768
13%
1795

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
16%6%25%5%3445%7%38%
46093
Night
16%6%2442445%7%41%
45841
Cloud CoverDay
16%6%25%5%3445%7%38%
46102
Night
16%6%2442445%7%41%
45847
TransparencyDay
44%5%11%21%14%2
45781
Night
42%5%12%22%15%2
45671
SeeingDay
22%13%27%21%11%3
5178
Night
21%14%30%24%8%
14654

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
14%6%35%5%46%35%439%
1432
16th to endDay
14%7%25%5%35%5%5%7%37%
1659
February1st to 15thDay
15%8%36%6%3445%6%35%
1600
16th to endDay
15%7%36%7%35%435%38%
1580
March1st to 15thDay
16%8%35%6%3445%7%35%
1832
16th to endDay
17%7%25%5%24347%39%
2206
April1st to 15thDay
19%7%25%323346%39%
2152
16th to endDay
15%5%35%5%235%5%6%41%
2160
May1st to 15thDay
21%6%25%5%34447%35%
2204
16th to endDay
16%5%25%436%5%5%8%35%
2394
June1st to 15thDay
18%5%35%5%36%5%6%8%31%
2310
16th to endDay
13%5%25%6%445%6%7%37%
2310
July1st to 15thDay
11%5%26%7%46%6%5%8%34%
2310
16th to endDay
10%5%26%5%36%6%7%9%37%
2458
August1st to 15thDay
13%5%246%36%6%6%7%36%
2110
16th to endDay
13%5%35%444447%42%
2100
September1st to 15thDay
15%4245%35%447%43%
1980
16th to endDay
15%5%25%423445%45%
1845
October1st to 15thDay
17%5%245%3335%7%41%
1661
16th to endDay
20%4145%33447%40%
1700
November1st to 15thDay
17%7%2442334445%
1581
16th to endDay
19%5%2332345%6%42%
1533
December1st to 15thDay
17%7%36%5%25%5%5%6%36%
1440
16th to endDay
20%8%35%424447%33%
1536
January1st to 15thNight
17%6%345%24446%39%
2506
16th to endNight
15%8%35%423446%40%
2563
February1st to 15thNight
14%8%36%6%34446%38%
2258
16th to endNight
15%5%35%42445%5%42%
1893
March1st to 15thNight
17%6%35%424446%40%
2103
16th to endNight
16%7%3442435%6%42%
2016
April1st to 15thNight
17%6%25%4245%6%6%37%
1796
16th to endNight
18%5%233245%46%42%
1800
May1st to 15thNight
18%6%24425%447%38%
1435
16th to endNight
13%5%244345%5%6%42%
1367
June1st to 15thNight
19%5%24425%35%8%37%
1320
16th to endNight
10%3145%3446%9%45%
1320
July1st to 15thNight
10%4145%45%5%6%9%40%
1320
16th to endNight
8%413426%6%7%11%44%
1402
August1st to 15thNight
10%42442447%8%45%
1507
16th to endNight
14%415%42446%10%41%
1750
September1st to 15thNight
15%5%24424345%47%
1650
16th to endNight
13%5%15%323347%49%
1785
October1st to 15thNight
18%5%24423346%44%
1966
16th to endNight
19%5%23322347%44%
2172
November1st to 15thNight
15%6%24423445%46%
2277
16th to endNight
16%6%35%43345%7%39%
2427
December1st to 15thNight
19%7%35%435%45%6%33%
2520
16th to endNight
18%7%25%5%35%437%36%
2688

Percentage Cloud Cover SE (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%6%35%6%46%35%339%
1432
16th to endDay
13%7%35%5%35%5%5%7%37%
1659
February1st to 15thDay
16%7%36%5%2445%7%35%
1600
16th to endDay
15%7%36%6%3443438%
1580
March1st to 15thDay
17%7%35%5%3445%6%35%
1842
16th to endDay
17%6%25%5%24337%39%
2205
April1st to 15thDay
19%7%25%323346%39%
2152
16th to endDay
15%5%25%4245%5%6%41%
2160
May1st to 15thDay
22%5%26%434447%35%
2204
16th to endDay
16%5%25%445%45%8%35%
2394
June1st to 15thDay
17%5%35%5%26%6%6%8%31%
2310
16th to endDay
13%5%25%7%35%46%8%37%
2310
July1st to 15thDay
11%5%26%6%46%6%5%8%35%
2310
16th to endDay
10%5%25%5%36%5%6%9%37%
2458
August1st to 15thDay
14%5%25%5%46%5%6%6%37%
2110
16th to endDay
14%5%25%5%34447%42%
2100
September1st to 15thDay
14%4245%34347%43%
1980
16th to endDay
16%424424445%46%
1845
October1st to 15thDay
17%6%245%33447%41%
1661
16th to endDay
20%42443335%7%40%
1700
November1st to 15thDay
17%7%2442234445%
1581
16th to endDay
18%5%2432345%6%43%
1533
December1st to 15thDay
17%6%35%5%25%45%6%36%
1440
16th to endDay
19%9%35%424447%33%
1536
January1st to 15thNight
17%5%245%345%46%39%
2506
16th to endNight
15%8%34423446%41%
2563
February1st to 15thNight
13%9%36%5%34446%38%
2251
16th to endNight
15%5%35%42445%5%42%
1893
March1st to 15thNight
18%6%34424346%40%
2116
16th to endNight
16%8%24424346%42%
2016
April1st to 15thNight
17%6%25%43446%6%37%
1796
16th to endNight
19%5%2332445%6%42%
1800
May1st to 15thNight
18%6%244345%46%39%
1435
16th to endNight
14%5%235%345%5%7%42%
1367
June1st to 15thNight
19%434425%448%37%
1320
16th to endNight
10%5%1443446%9%45%
1320
July1st to 15thNight
10%5%145%45%6%6%9%40%
1320
16th to endNight
8%313435%5%7%11%43%
1402
August1st to 15thNight
11%5%1443446%9%44%
1507
16th to endNight
14%415%5%2346%10%41%
1750
September1st to 15thNight
15%5%24323346%46%
1650
16th to endNight
13%5%24413347%49%
1785
October1st to 15thNight
18%5%25%423336%45%
1966
16th to endNight
19%5%24222347%44%
2172
November1st to 15thNight
15%6%24314445%46%
2277
16th to endNight
16%6%46%42335%7%39%
2427
December1st to 15thNight
19%7%35%435%45%6%34%
2520
16th to endNight
18%8%245%24446%36%
2688

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
46%5%11%23%10%2
1433
16th to endDay
44%412%23%12%2
1659
February1st to 15thDay
47%5%11%20%12%1
1603
16th to endDay
48%410%23%11%1
1580
March1st to 15thDay
48%5%13%20%10%1
1842
16th to endDay
45%49%19%17%3
2206
April1st to 15thDay
45%49%22%13%4
2152
16th to endDay
40%6%9%18%20%3
2160
May1st to 15thDay
49%5%8%20%14%2
2204
16th to endDay
44%7%12%19%14%1
2398
June1st to 15thDay
48%8%12%20%9%
2310
16th to endDay
44%7%12%22%11%1
2310
July1st to 15thDay
45%7%10%19%14%1
2161
16th to endDay
39%7%13%23%13%2
2291
August1st to 15thDay
42%8%12%18%16%
2096
16th to endDay
42%6%7%22%18%2
2100
September1st to 15thDay
40%5%10%19%22%1
1980
16th to endDay
40%48%20%23%3
1845
October1st to 15thDay
43%5%12%20%15%1
1661
16th to endDay
43%411%25%14%1
1700
November1st to 15thDay
42%411%20%18%3
1581
16th to endDay
41%311%26%15%1
1533
December1st to 15thDay
46%6%15%18%11%1
1440
16th to endDay
50%315%18%11%
1536
January1st to 15thNight
44%5%12%21%12%2
2506
16th to endNight
43%411%24%14%1
2563
February1st to 15thNight
46%5%12%20%12%2
2259
16th to endNight
41%49%25%16%2
1893
March1st to 15thNight
44%413%21%13%2
2116
16th to endNight
42%311%21%17%2
2016
April1st to 15thNight
45%6%10%19%15%2
1796
16th to endNight
42%5%8%20%21%2
1800
May1st to 15thNight
45%5%10%19%16%2
1435
16th to endNight
39%8%15%17%15%2
1369
June1st to 15thNight
46%6%12%20%13%
1320
16th to endNight
33%7%14%30%13%
1320
July1st to 15thNight
39%8%12%23%14%1
1240
16th to endNight
31%8%19%23%14%2
1306
August1st to 15thNight
34%7%15%24%16%2
1497
16th to endNight
37%8%11%21%19%1
1750
September1st to 15thNight
38%6%10%22%21%
1650
16th to endNight
35%47%22%26%2
1785
October1st to 15thNight
41%411%24%15%2
1966
16th to endNight
39%5%12%26%16%
2172
November1st to 15thNight
39%5%11%21%18%4
2277
16th to endNight
43%412%24%12%2
2427
December1st to 15thNight
49%5%14%19%10%
2520
16th to endNight
48%413%21%11%
2688

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
30%31%21%13%3
60
16th to endDay
27%22%42%7%1
85
February1st to 15thDay
31%35%23%9%
117
16th to endDay
23%22%38%12%3
239
March1st to 15thDay
27%18%31%17%4
270
16th to endDay
25%21%30%15%5%1
288
April1st to 15thDay
24%19%31%14%8%1
270
16th to endDay
24%10%37%17%8%2
270
May1st to 15thDay
39%11%21%17%7%2
229
16th to endDay
19%12%24%26%14%2
267
June1st to 15thDay
22%14%22%25%12%1
255
16th to endDay
18%5%32%28%12%2
255
July1st to 15thDay
19%6%23%29%16%4
245
16th to endDay
14%5%25%31%17%5%
270
August1st to 15thDay
17%421%32%18%5%
253
16th to endDay
12%322%28%22%11%
268
September1st to 15thDay
14%9%26%25%13%10%
255
16th to endDay
19%5%22%25%14%12%
254
October1st to 15thDay
19%8%29%22%15%3
255
16th to endDay
22%18%30%19%8%
261
November1st to 15thDay
24%14%25%21%11%2
235
16th to endDay
23%20%30%19%41
153
December1st to 15thDay
36%20%23%13%6%
60
16th to endDay
39%20%32%6%1
64
January1st to 15thNight
24%18%35%16%3
720
16th to endNight
22%20%38%16%1
768
February1st to 15thNight
22%22%38%15%1
704
16th to endNight
25%20%34%18%1
631
March1st to 15thNight
27%21%28%19%2
720
16th to endNight
23%21%32%15%5%1
768
April1st to 15thNight
22%19%36%18%3
718
16th to endNight
22%14%32%23%6%
720
May1st to 15thNight
22%13%29%27%7%
439
16th to endNight
16%8%27%36%11%
343
June1st to 15thNight
19%6%29%30%13%
330
16th to endNight
12%324%48%11%
330
July1st to 15thNight
13%426%37%17%
310
16th to endNight
10%322%43%18%2
348
August1st to 15thNight
13%121%39%21%1
516
16th to endNight
15%320%33%25%2
700
September1st to 15thNight
18%6%24%33%15%1
660
16th to endNight
15%425%27%21%3
657
October1st to 15thNight
20%11%25%27%14%1
660
16th to endNight
24%14%31%23%5%
704
November1st to 15thNight
20%16%29%22%10%
700
16th to endNight
21%16%31%22%7%
720
December1st to 15thNight
27%15%33%18%5%
720
16th to endNight
26%18%36%16%2
768
Page generated at 2017-05-02 08:43:30. Version ac04

Copyright 2017 A. Danko


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