Jigg's Landing Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jigg's Landing Park clear sky chart from 2005-11-06 to 2024-01-12.

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
63%
24438
20%
74520
17%
24387
67%
24387
30%
46113

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
50%
758
21%
2459
17%
757
59%
757
28%
1475
January11th to 20thNight
55%
728
25%
2365
21%
728
63%
728
32%
1345
January21st to endNight
44%
792
23%
2395
17%
792
52%
792
28%
1485
February1st to 10thNight
49%
720
23%
2160
18%
720
55%
720
32%
1308
February11th to 20thNight
55%
700
24%
2099
18%
700
62%
700
38%
1168
February21st to endNight
59%
592
27%
1722
21%
592
65%
592
38%
978
March1st to 10thNight
55%
720
32%
1980
20%
720
65%
720
50%
1036
March11th to 20thNight
58%
720
28%
1980
19%
720
65%
720
42%
1113
March21st to endNight
59%
792
30%
2178
22%
792
64%
792
43%
1209
April1st to 10thNight
61%
720
24%
1980
18%
720
66%
720
44%
1112
April11th to 20thNight
57%
711
20%
1953
15%
711
61%
711
38%
1160
April21st to endNight
63%
720
29%
1850
21%
720
66%
720
48%
1050
May1st to 10thNight
80%
540
32%
1620
28%
540
83%
540
54%
783
May11th to 20thNight
71%
531
18%
1592
15%
531
73%
531
33%
982
May21st to endNight
76%
582
24%
1745
21%
582
76%
582
37%
1024
June1st to 10thNight
72%
540
15%
1620
13%
540
73%
540
26%
1095
June11th to 20thNight
80%
540
12%
1620
10%
540
81%
540
30%
1034
June21st to endNight
77%
540
9%
1620
9%
540
77%
540
25%
1109
July1st to 10thNight
76%
525
6%
1575
5%
525
76%
525
21%
1133
July11th to 20thNight
80%
522
4%
1566
5%
522
80%
522
21%
1156
July21st to endNight
76%
591
8%
1672
9%
558
77%
558
23%
1182
August1st to 10thNight
81%
537
3%
1638
3%
534
81%
534
25%
1133
August11th to 20thNight
76%
534
6%
1776
6%
534
76%
534
20%
1235
August21st to endNight
64%
782
8%
2168
8%
782
64%
782
17%
1656
September1st to 10thNight
72%
720
8%
1980
8%
720
72%
720
21%
1435
September11th to 20thNight
64%
720
8%
1980
8%
720
64%
720
19%
1462
September21st to endNight
62%
720
15%
1980
14%
720
63%
720
22%
1419
October1st to 10thNight
66%
720
20%
1980
19%
720
68%
720
30%
1284
October11th to 20thNight
67%
720
26%
2109
26%
720
70%
720
36%
1249
October21st to endNight
61%
792
26%
2376
26%
792
66%
792
35%
1385
November1st to 10thNight
60%
740
26%
2221
22%
740
67%
740
36%
1287
November11th to 20thNight
56%
760
29%
2280
25%
760
62%
760
34%
1346
November21st to endNight
56%
760
26%
2408
24%
760
62%
760
32%
1402
December1st to 10thNight
59%
760
26%
2470
24%
760
65%
760
32%
1421
December11th to 20thNight
57%
759
24%
2940
23%
758
62%
758
25%
1675
December21st to endNight
54%
830
15%
4463
24%
817
59%
817
17%
2787

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
8%5%26%6%46%6%7%9%40%
74829
Night
7%5%25%5%35%6%7%10%44%
74898
TransparencyDay
37%10%16%19%14%5%
74552
Night
34%9%17%21%15%5%
74694
SeeingDay
8%415%26%27%21%
14348
Night
8%315%34%30%10%
24452

By Month

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 10thDay
10%5%35%5%345%5%10%45%
1706
11th to 20thDay
7%426%4345%6%10%50%
1635
21st to endDay
11%5%25%6%35%45%8%46%
1958
February1st to 10thDay
10%5%35%5%35%5%6%7%46%
1800
11th to 20thDay
6%42442436%7%57%
1748
21st to endDay
8%4235%245%6%7%54%
1531
March1st to 10thDay
4313434448%61%
1980
11th to 20thDay
7%3233235%7%9%56%
1980
21st to endDay
7%42433445%9%55%
2178
April1st to 10thDay
6%3244345%8%8%52%
1980
11th to 20thDay
8%426%445%5%7%8%46%
1956
21st to endDay
5%3134346%6%10%55%
2118
May1st to 10thDay
431232347%9%61%
2340
11th to 20thDay
9%4246%46%6%8%9%42%
2301
21st to endDay
7%5%36%6%5%7%6%8%10%39%
2531
June1st to 10thDay
11%8%36%7%5%7%7%8%11%28%
2340
11th to 20thDay
6%5%36%8%5%8%9%9%12%30%
2340
21st to endDay
8%6%36%7%5%8%9%9%10%28%
2340
July1st to 10thDay
9%437%8%5%9%10%10%11%24%
2340
11th to 20thDay
6%5%38%8%7%9%8%10%11%24%
2340
21st to endDay
7%5%38%8%6%10%9%9%11%23%
2547
August1st to 10thDay
6%5%38%9%5%10%9%10%12%23%
2284
11th to 20thDay
6%5%37%9%6%10%11%11%10%22%
2117
21st to endDay
10%7%37%8%6%8%9%9%11%22%
2178
September1st to 10thDay
8%5%37%8%6%9%9%9%12%24%
1980
11th to 20thDay
10%7%37%9%5%7%9%8%10%24%
1980
21st to endDay
8%5%28%8%5%7%8%9%11%31%
1980
October1st to 10thDay
8%6%37%7%46%6%7%9%37%
1980
11th to 20thDay
7%425%5%46%46%9%49%
1850
21st to endDay
7%5%25%6%345%6%9%48%
1980
November1st to 10thDay
6%5%245%45%5%6%8%50%
1857
11th to 20thDay
9%5%36%5%35%5%6%8%47%
1900
21st to endDay
8%5%245%45%5%6%9%48%
1767
December1st to 10thDay
7%4345%45%5%6%10%47%
1710
11th to 20thDay
10%6%36%5%445%6%8%45%
2153
21st to endDay
11%7%48%8%45%5%5%6%36%
3124
January1st to 10thNight
9%6%35%5%35%5%6%9%43%
2459
11th to 20thNight
9%6%25%5%345%6%9%47%
2365
21st to endNight
12%5%26%5%345%5%7%43%
2395
February1st to 10thNight
10%6%36%5%3445%8%47%
2160
11th to 20thNight
8%5%3443445%7%54%
2098
21st to endNight
6%5%25%5%35%6%7%7%50%
1722
March1st to 10thNight
42234345%5%9%61%
1980
11th to 20thNight
6%325%4245%6%9%53%
1980
21st to endNight
5%325%43445%7%57%
2178
April1st to 10thNight
5%3234345%6%10%55%
1980
11th to 20thNight
6%415%5%35%6%7%10%49%
1953
21st to endNight
432443446%9%57%
1850
May1st to 10thNight
221232445%9%65%
1620
11th to 20thNight
7%425%6%45%5%6%8%48%
1592
21st to endNight
45%25%5%26%5%6%8%53%
1744
June1st to 10thNight
11%5%35%5%46%6%6%11%39%
1620
11th to 20thNight
6%325%6%36%7%10%12%40%
1620
21st to endNight
6%5%35%6%46%8%9%14%36%
1620
July1st to 10thNight
7%5%36%6%47%6%10%13%34%
1620
11th to 20thNight
4426%5%6%9%8%9%15%31%
1620
21st to endNight
45%37%6%5%8%8%10%12%32%
1771
August1st to 10thNight
4425%6%46%7%9%15%36%
1649
11th to 20thNight
6%5%35%6%5%7%8%9%15%31%
1776
21st to endNight
9%6%28%8%5%8%8%8%11%28%
2168
September1st to 10thNight
5%436%8%5%9%7%10%13%31%
1980
11th to 20thNight
9%5%37%9%5%6%6%8%11%30%
1980
21st to endNight
8%7%37%7%5%7%7%7%10%31%
1980
October1st to 10thNight
6%6%35%6%36%6%7%10%42%
1980
11th to 20thNight
6%6%35%5%3445%9%50%
2109
21st to endNight
8%5%25%5%3446%9%48%
2376
November1st to 10thNight
7%435%435%5%5%9%51%
2221
11th to 20thNight
8%5%35%5%345%5%8%49%
2280
21st to endNight
8%435%6%35%5%5%9%47%
2408
December1st to 10thNight
7%425%5%35%6%5%8%49%
2470
11th to 20thNight
12%5%24435%5%6%7%47%
3042
21st to endNight
14%7%36%6%45%6%6%8%35%
4532

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
34%6%12%24%17%7%
1707
11th to 20thDay
30%410%27%21%8%
1635
21st to endDay
36%6%8%20%22%8%
1958
February1st to 10thDay
35%6%11%21%17%10%
1800
11th to 20thDay
25%5%11%22%26%10%
1758
21st to endDay
29%5%12%18%26%9%
1531
March1st to 10thDay
22%6%11%26%26%10%
1980
11th to 20thDay
24%6%12%29%20%8%
1980
21st to endDay
26%6%11%26%24%7%
2178
April1st to 10thDay
28%7%18%23%18%6%
1980
11th to 20thDay
33%8%13%18%23%5%
1956
21st to endDay
24%8%13%23%26%6%
2118
May1st to 10thDay
19%7%14%28%25%8%
2340
11th to 20thDay
35%10%16%20%17%2
2305
21st to endDay
37%11%13%21%16%2
2531
June1st to 10thDay
46%13%19%17%4
2340
11th to 20thDay
41%15%22%18%3
2340
21st to endDay
46%14%24%13%3
2340
July1st to 10thDay
46%18%26%7%2
2275
11th to 20thDay
49%16%26%9%1
2271
21st to endDay
46%16%25%12%1
2405
August1st to 10thDay
44%18%30%8%
2271
11th to 20thDay
46%21%24%9%
2117
21st to endDay
50%17%22%10%1
2178
September1st to 10thDay
46%17%23%12%1
1980
11th to 20thDay
49%14%20%13%3
1980
21st to endDay
42%14%16%17%9%2
1980
October1st to 10thDay
40%10%12%17%13%8%
1980
11th to 20thDay
32%7%10%23%23%4
1850
21st to endDay
32%6%11%20%20%11%
1980
November1st to 10thDay
31%5%12%21%19%11%
1857
11th to 20thDay
35%6%9%21%21%8%
1900
21st to endDay
32%6%13%22%19%8%
1767
December1st to 10thDay
32%6%13%27%17%5%
1710
11th to 20thDay
35%6%10%19%18%11%
2150
21st to endDay
46%7%10%18%15%4
3124
January1st to 10thNight
37%5%13%22%17%6%
2459
11th to 20thNight
33%5%10%26%20%6%
2365
21st to endNight
39%5%11%20%18%7%
2395
February1st to 10thNight
36%5%11%20%20%8%
2160
11th to 20thNight
29%411%22%23%10%
2099
21st to endNight
29%6%15%19%25%7%
1722
March1st to 10thNight
19%6%12%31%23%8%
1980
11th to 20thNight
27%5%15%28%19%7%
1980
21st to endNight
26%5%11%27%24%7%
2178
April1st to 10thNight
25%6%20%27%15%7%
1980
11th to 20thNight
28%8%16%22%21%4
1953
21st to endNight
23%6%14%27%26%4
1850
May1st to 10thNight
17%5%12%32%24%9%
1620
11th to 20thNight
32%9%19%23%16%1
1593
21st to endNight
28%8%17%27%19%1
1745
June1st to 10thNight
39%11%21%22%7%
1620
11th to 20thNight
31%13%30%21%4
1620
21st to endNight
35%16%29%15%6%
1620
July1st to 10thNight
39%17%33%10%1
1575
11th to 20thNight
39%19%32%10%
1566
21st to endNight
36%18%33%13%1
1672
August1st to 10thNight
33%18%37%11%1
1638
11th to 20thNight
37%18%35%10%
1776
21st to endNight
46%17%23%12%2
2168
September1st to 10thNight
39%18%27%14%2
1980
11th to 20thNight
45%14%24%14%2
1980
21st to endNight
43%12%18%16%9%1
1980
October1st to 10thNight
35%11%16%18%14%7%
1980
11th to 20thNight
31%7%13%23%22%5%
2109
21st to endNight
32%6%13%18%22%9%
2376
November1st to 10thNight
31%6%11%21%20%11%
2221
11th to 20thNight
33%6%11%23%19%8%
2280
21st to endNight
32%7%12%23%19%7%
2408
December1st to 10thNight
32%7%12%29%17%4
2470
11th to 20thNight
35%6%10%21%17%11%
3044
21st to endNight
44%7%14%17%15%4
4532

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
11%10%35%31%10%2
270
11th to 20thDay
9%9%31%31%15%4
245
21st to endDay
14%11%43%25%6%1
264
February1st to 10thDay
10%12%28%32%14%4
240
11th to 20thDay
6%5%29%38%18%5%
240
21st to endDay
6%6%28%38%20%3
249
March1st to 10thDay
5%437%35%16%2
420
11th to 20thDay
8%6%28%31%25%2
420
21st to endDay
5%5%28%33%23%5%
462
April1st to 10thDay
6%5%31%35%21%2
420
11th to 20thDay
8%5%23%39%20%5%
412
21st to endDay
5%221%33%31%7%
420
May1st to 10thDay
6%216%34%31%12%
423
11th to 20thDay
9%311%29%30%17%
447
21st to endDay
7%26%22%34%28%
485
June1st to 10thDay
13%37%22%30%24%
450
11th to 20thDay
9%25%19%30%36%
450
21st to endDay
5%1310%30%51%
450
July1st to 10thDay
6%116%29%56%
445
11th to 20thDay
6%216%33%52%
444
21st to endDay
10%2212%29%46%
488
August1st to 10thDay
7%1211%31%49%
446
11th to 20thDay
6%2210%28%53%
439
21st to endDay
9%2416%30%39%
495
September1st to 10thDay
8%2412%32%43%
450
11th to 20thDay
9%3320%36%30%
450
21st to endDay
6%2219%37%33%
450
October1st to 10thDay
9%210%34%33%12%
450
11th to 20thDay
7%113%33%33%14%
450
21st to endDay
9%312%36%33%7%
495
November1st to 10thDay
8%319%33%30%7%
455
11th to 20thDay
12%220%38%21%6%
460
21st to endDay
10%224%37%20%5%
327
December1st to 10thDay
5%9%29%33%17%8%
270
11th to 20thDay
9%5%31%30%20%4
270
21st to endDay
8%430%35%19%4
297
January1st to 10thNight
11%428%40%16%1
760
11th to 20thNight
11%5%22%46%15%1
728
21st to endNight
11%7%29%40%13%
792
February1st to 10thNight
12%5%27%41%14%1
720
11th to 20thNight
10%423%43%19%1
703
21st to endNight
8%421%47%19%
592
March1st to 10thNight
4333%45%13%1
720
11th to 20thNight
6%425%43%20%2
720
21st to endNight
5%324%47%19%2
792
April1st to 10thNight
5%324%45%22%1
720
11th to 20thNight
8%324%45%19%1
711
21st to endNight
6%223%47%22%1
720
May1st to 10thNight
4110%47%34%3
540
11th to 20thNight
8%29%40%36%5%
531
21st to endNight
6%15%34%46%7%
584
June1st to 10thNight
10%1425%46%14%
540
11th to 20thNight
5%2214%52%26%
540
21st to endNight
6%2210%47%33%
540
July1st to 10thNight
8%15%45%40%
525
11th to 20thNight
5%216%41%46%
522
21st to endNight
4116%49%37%
591
August1st to 10thNight
5%117%49%37%
537
11th to 20thNight
7%127%37%47%
534
21st to endNight
12%3314%42%27%
782
September1st to 10thNight
5%2316%49%25%
720
11th to 20thNight
11%3320%43%20%
720
21st to endNight
10%2425%43%15%
720
October1st to 10thNight
8%211%40%34%5%
720
11th to 20thNight
9%212%37%37%4
720
21st to endNight
10%215%41%29%3
792
November1st to 10thNight
8%221%44%22%3
740
11th to 20thNight
8%322%43%23%3
760
21st to endNight
8%323%47%18%1
760
December1st to 10thNight
8%421%40%26%1
760
11th to 20thNight
11%420%40%22%2
760
21st to endNight
10%323%42%21%1
836
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