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 2018-02-22.

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
29%
15650
19%
48906
9%
15619
41%
15619
21%
31559

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
17%
780
18%
2716
7%
776
33%
776
15%
1747
January16th to endNight
14%
832
20%
2776
4%
832
34%
832
16%
1761
February1st to 15thNight
11%
764
16%
2451
2%
761
28%
761
13%
1660
February16th to endNight
16%
659
25%
1976
7%
659
38%
659
17%
1269
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
25%
718
19%
1270
April16th to endNight
26%
720
18%
1800
4%
720
33%
720
25%
1236
May1st to 15thNight
30%
474
18%
1554
8%
474
40%
474
17%
1048
May16th to endNight
40%
374
15%
1497
12%
374
48%
374
19%
926
June1st to 15thNight
40%
360
14%
1440
12%
360
51%
360
18%
917
June16th to endNight
51%
360
16%
1440
16%
360
60%
360
25%
816
July1st to 15thNight
51%
340
13%
1360
15%
340
57%
340
20%
837
July16th to endNight
57%
376
15%
1418
16%
354
63%
354
25%
800
August1st to 15thNight
54%
564
18%
1635
12%
562
58%
562
32%
1032
August16th to endNight
54%
764
19%
1910
10%
764
57%
764
31%
1280
September1st to 15thNight
42%
720
23%
1800
11%
720
49%
720
31%
1187
September16th to endNight
50%
717
27%
1947
19%
717
56%
717
35%
1203
October1st to 15thNight
38%
720
20%
2145
14%
720
47%
720
25%
1379
October16th to endNight
27%
768
24%
2370
11%
768
44%
768
25%
1471
November1st to 15thNight
30%
760
20%
2472
9%
760
45%
760
21%
1537
November16th to endNight
26%
780
21%
2629
11%
780
40%
780
19%
1646
December1st to 15thNight
19%
780
14%
2730
5%
780
31%
780
13%
1860
December16th to endNight
14%
832
17%
2912
3%
832
32%
832
14%
1923

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%
49350
Night
15%6%2442445%7%41%
49076
Cloud CoverDay
16%6%25%5%3445%7%38%
49359
Night
16%6%2442445%7%41%
49082
TransparencyDay
44%5%11%21%15%2
49038
Night
41%5%12%22%15%2
48906
SeeingDay
22%13%28%21%10%3
6190
Night
21%13%30%24%9%
15651

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%35%35%440%
1552
16th to endDay
14%7%35%5%345%5%7%38%
1797
February1st to 15thDay
16%8%36%5%2445%6%35%
1738
16th to endDay
15%7%36%6%35%435%38%
1644
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%26%5%34447%34%
2404
16th to endDay
17%6%25%5%36%5%5%8%34%
2618
June1st to 15thDay
17%5%25%5%36%5%6%8%32%
2520
16th to endDay
14%5%25%6%345%6%7%37%
2520
July1st to 15thDay
11%5%26%7%45%6%5%8%35%
2520
16th to endDay
10%5%26%5%36%5%6%9%37%
2654
August1st to 15thDay
13%6%25%6%36%6%6%7%35%
2301
16th to endDay
13%425%43445%7%42%
2292
September1st to 15thDay
15%4245%35%447%42%
2160
16th to endDay
14%425%5%24445%45%
2013
October1st to 15thDay
18%5%2443335%7%40%
1812
16th to endDay
19%5%14433447%41%
1854
November1st to 15thDay
17%7%2442334444%
1716
16th to endDay
18%5%2332335%5%44%
1661
December1st to 15thDay
17%7%35%5%25%5%5%6%36%
1560
16th to endDay
19%8%35%42445%7%33%
1664
January1st to 15thNight
17%5%345%345%46%39%
2716
16th to endNight
15%8%35%423446%41%
2776
February1st to 15thNight
14%8%36%5%24445%37%
2450
16th to endNight
16%5%35%3245%5%5%41%
1976
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
19%7%25%425%447%37%
1554
16th to endNight
14%6%244345%5%6%41%
1495
June1st to 15thNight
18%5%24425%35%7%40%
1440
16th to endNight
10%414425%5%7%9%44%
1440
July1st to 15thNight
11%4245%35%5%5%10%40%
1440
16th to endNight
9%413426%6%7%10%43%
1514
August1st to 15thNight
11%42442447%8%44%
1645
16th to endNight
13%41442445%10%42%
1910
September1st to 15thNight
15%5%2432435%5%47%
1800
16th to endNight
12%5%15%423347%50%
1947
October1st to 15thNight
18%5%24423346%44%
2145
16th to endNight
19%5%23322346%46%
2370
November1st to 15thNight
15%6%24324445%45%
2472
16th to endNight
15%6%35%42345%7%41%
2629
December1st to 15thNight
19%8%35%435%45%6%32%
2730
16th to endNight
18%7%25%5%35%447%37%
2912

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%5%45%35%340%
1552
16th to endDay
14%7%35%5%35%45%7%38%
1797
February1st to 15thDay
17%8%36%5%2435%7%35%
1738
16th to endDay
16%7%36%6%3443438%
1644
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%6%26%434437%34%
2404
16th to endDay
17%5%25%5%35%45%8%35%
2618
June1st to 15thDay
17%5%35%5%26%6%6%8%32%
2520
16th to endDay
14%5%25%7%35%46%7%37%
2520
July1st to 15thDay
12%5%26%6%46%6%5%8%35%
2520
16th to endDay
11%5%25%5%36%5%6%8%37%
2654
August1st to 15thDay
14%5%25%5%46%5%6%6%36%
2301
16th to endDay
13%5%25%5%34447%42%
2292
September1st to 15thDay
14%4245%34447%42%
2160
16th to endDay
15%4245%24435%45%
2013
October1st to 15thDay
18%6%245%33447%40%
1812
16th to endDay
19%424433347%41%
1854
November1st to 15thDay
17%7%2442334444%
1716
16th to endDay
17%5%24323446%45%
1661
December1st to 15thDay
17%7%35%5%25%45%6%36%
1560
16th to endDay
18%9%35%424447%34%
1664
January1st to 15thNight
17%5%25%5%345%46%39%
2716
16th to endNight
15%8%35%423445%41%
2776
February1st to 15thNight
14%9%36%5%34446%37%
2443
16th to endNight
16%6%35%42445%5%41%
1976
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
19%7%244245%46%37%
1554
16th to endNight
15%5%245%345%5%7%41%
1495
June1st to 15thNight
18%434425%448%39%
1440
16th to endNight
10%5%1443447%9%44%
1440
July1st to 15thNight
10%4145%45%6%6%9%40%
1440
16th to endNight
10%413435%6%7%11%42%
1514
August1st to 15thNight
11%5%1443446%9%43%
1645
16th to endNight
13%415%42346%9%43%
1910
September1st to 15thNight
15%5%24323346%46%
1800
16th to endNight
12%5%24423347%50%
1947
October1st to 15thNight
18%5%25%423346%44%
2145
16th to endNight
19%5%24222347%46%
2370
November1st to 15thNight
15%6%24414445%46%
2472
16th to endNight
15%5%36%42345%7%41%
2629
December1st to 15thNight
19%8%35%435%45%6%33%
2730
16th to endNight
17%7%25%5%24446%37%
2912

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
45%5%11%23%11%3
1553
16th to endDay
44%412%22%12%2
1797
February1st to 15thDay
48%5%11%20%12%1
1741
16th to endDay
48%410%23%11%1
1644
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
50%5%8%19%14%2
2404
16th to endDay
46%7%12%19%13%1
2622
June1st to 15thDay
47%8%12%20%10%
2520
16th to endDay
44%7%12%22%11%1
2520
July1st to 15thDay
45%7%10%19%15%1
2371
16th to endDay
40%7%13%23%13%2
2487
August1st to 15thDay
43%8%12%18%15%
2287
16th to endDay
40%6%8%23%18%2
2292
September1st to 15thDay
40%5%10%19%21%1
2160
16th to endDay
39%5%7%20%23%3
2013
October1st to 15thDay
43%6%11%20%16%1
1812
16th to endDay
42%410%25%15%1
1854
November1st to 15thDay
42%411%20%16%2
1716
16th to endDay
40%310%27%16%2
1661
December1st to 15thDay
46%6%15%17%12%
1560
16th to endDay
49%415%17%12%
1664
January1st to 15thNight
43%5%12%21%13%3
2716
16th to endNight
43%411%24%14%1
2776
February1st to 15thNight
47%5%12%20%12%2
2451
16th to endNight
41%49%25%16%2
1976
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
47%5%9%18%16%1
1554
16th to endNight
40%8%15%18%14%2
1497
June1st to 15thNight
44%6%12%20%14%
1440
16th to endNight
34%7%14%29%13%
1440
July1st to 15thNight
39%8%12%22%14%1
1360
16th to endNight
32%9%18%23%14%2
1418
August1st to 15thNight
34%8%14%24%16%2
1635
16th to endNight
36%8%11%21%20%1
1910
September1st to 15thNight
37%6%10%23%21%1
1800
16th to endNight
34%47%22%27%2
1947
October1st to 15thNight
41%411%24%15%2
2145
16th to endNight
38%412%27%16%
2370
November1st to 15thNight
39%5%12%21%17%4
2472
16th to endNight
41%412%25%13%1
2629
December1st to 15thNight
49%5%14%18%10%
2730
16th to endNight
47%413%21%11%
2912

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
33%30%23%10%21
90
16th to endDay
26%23%41%6%1
127
February1st to 15thDay
35%34%23%7%
165
16th to endDay
24%23%36%12%3
265
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
38%14%22%15%6%2
288
16th to endDay
22%12%25%24%12%1
331
June1st to 15thDay
22%14%23%24%13%1
315
16th to endDay
20%7%34%25%9%2
315
July1st to 15thDay
19%6%27%29%14%3
305
16th to endDay
15%5%24%30%18%5%
326
August1st to 15thDay
18%5%22%31%15%6%
313
16th to endDay
11%326%28%19%9%
332
September1st to 15thDay
15%12%27%22%13%8%
315
16th to endDay
17%6%22%26%15%12%
314
October1st to 15thDay
21%6%30%21%15%4
315
16th to endDay
23%17%28%19%9%1
319
November1st to 15thDay
25%13%27%21%11%1
280
16th to endDay
25%20%29%19%41
191
December1st to 15thDay
38%18%24%10%7%
90
16th to endDay
38%21%31%7%1
96
January1st to 15thNight
24%19%36%16%3
780
16th to endNight
22%20%38%17%
832
February1st to 15thNight
23%21%38%14%1
764
16th to endNight
26%20%33%17%1
659
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
23%14%28%26%7%
474
16th to endNight
18%8%27%34%11%
375
June1st to 15thNight
18%6%28%31%13%
360
16th to endNight
12%326%46%10%
360
July1st to 15thNight
13%325%39%17%
340
16th to endNight
11%222%41%19%2
376
August1st to 15thNight
14%121%37%22%2
564
16th to endNight
15%319%33%25%2
764
September1st to 15thNight
19%6%25%31%15%1
720
16th to endNight
14%424%28%22%5%
717
October1st to 15thNight
20%10%24%27%15%1
720
16th to endNight
23%14%30%23%6%
768
November1st to 15thNight
20%16%28%23%10%
760
16th to endNight
20%16%32%22%7%
780
December1st to 15thNight
27%14%33%18%5%
780
16th to endNight
25%18%36%16%2
832
Page generated at 2018-02-23 11:21:38. Version ac04

Copyright 2018 A. Danko


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