Limerick Forest Pit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Limerick Forest Pit clear sky chart from 2005-11-05 to 2018-01-20.

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
28%
15192
14%
48497
8%
15161
35%
15161
17%
34285

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
14%
780
7%
2716
2%
776
20%
776
7%
2185
January16th to endNight
17%
788
10%
2702
5%
788
23%
788
10%
2073
February1st to 15thNight
14%
703
9%
2287
3%
701
22%
701
9%
1782
February16th to endNight
17%
631
13%
1937
5%
631
27%
631
12%
1481
March1st to 15thNight
19%
720
14%
2104
6%
720
27%
720
16%
1540
March16th to endNight
28%
768
20%
2031
8%
768
37%
768
22%
1412
April1st to 15thNight
22%
718
17%
1796
5%
718
28%
718
19%
1331
April16th to endNight
27%
666
18%
1746
6%
666
34%
666
23%
1220
May1st to 15thNight
34%
360
18%
1440
15%
360
45%
360
18%
924
May16th to endNight
32%
375
14%
1496
9%
374
44%
374
19%
930
June1st to 15thNight
33%
360
10%
1440
10%
360
43%
360
16%
958
June16th to endNight
39%
360
10%
1440
12%
360
45%
360
19%
881
July1st to 15thNight
50%
340
15%
1360
21%
340
57%
340
27%
742
July16th to endNight
52%
376
14%
1418
17%
354
57%
354
27%
798
August1st to 15thNight
47%
447
14%
1518
12%
445
52%
445
23%
947
August16th to endNight
48%
723
22%
1869
11%
723
54%
723
39%
1143
September1st to 15thNight
45%
720
17%
1800
8%
720
49%
720
33%
1202
September16th to endNight
48%
717
25%
1954
16%
717
53%
717
33%
1209
October1st to 15thNight
32%
720
18%
2160
12%
720
41%
720
21%
1460
October16th to endNight
23%
768
13%
2400
6%
768
32%
768
14%
1780
November1st to 15thNight
25%
760
17%
2511
11%
760
34%
760
17%
1732
November16th to endNight
20%
780
12%
2730
7%
780
27%
780
10%
2062
December1st to 15thNight
15%
780
7%
2730
2%
780
20%
780
8%
2165
December16th to endNight
13%
832
9%
2912
4%
832
20%
832
7%
2328

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
18%9%36%5%34446%32%
49040
Night
18%10%46%5%34445%32%
48667
Cloud CoverDay
18%9%36%5%34446%32%
49049
Night
18%10%46%5%34445%32%
48673
TransparencyDay
52%411%21%10%1
48727
Night
53%311%20%10%1
48498
SeeingDay
24%12%28%20%9%3
5853
Night
25%11%28%24%9%
15193

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
21%15%5%10%6%3444319%
1552
16th to endDay
15%13%6%10%9%45%44422%
1623
February1st to 15thDay
15%14%5%11%8%3444421%
1575
16th to endDay
19%14%6%8%6%3443424%
1536
March1st to 15thDay
18%13%5%9%7%2433326%
1844
16th to endDay
17%10%35%423335%39%
2193
April1st to 15thDay
23%10%35%42343433%
2152
16th to endDay
20%8%26%5%23435%36%
2223
May1st to 15thDay
20%7%36%5%24446%34%
2511
16th to endDay
17%6%26%43445%7%36%
2618
June1st to 15thDay
23%6%36%43445%7%30%
2520
16th to endDay
18%6%26%5%35%45%7%33%
2520
July1st to 15thDay
12%5%25%5%35%46%8%39%
2520
16th to endDay
12%425%5%36%6%7%9%35%
2654
August1st to 15thDay
12%6%26%7%45%5%5%7%35%
2430
16th to endDay
11%5%245%35%47%8%42%
2321
September1st to 15thDay
17%5%25%424437%40%
2160
16th to endDay
16%5%23323346%47%
2003
October1st to 15thDay
20%8%36%6%23446%34%
1800
16th to endDay
26%9%48%5%2435%5%25%
1824
November1st to 15thDay
15%7%37%6%46%446%32%
1677
16th to endDay
22%13%47%5%33346%24%
1560
December1st to 15thDay
23%16%5%8%6%3434419%
1560
16th to endDay
26%15%6%8%5%2432320%
1664
January1st to 15thNight
19%17%5%10%6%25%43419%
2716
16th to endNight
14%16%5%9%8%34435%23%
2702
February1st to 15thNight
15%14%6%12%7%2444422%
2285
16th to endNight
17%13%5%8%6%35%33426%
1937
March1st to 15thNight
20%11%47%5%24335%30%
2091
16th to endNight
18%9%36%42334439%
2031
April1st to 15thNight
23%8%35%5%2434434%
1796
16th to endNight
20%8%245%24446%38%
1746
May1st to 15thNight
20%6%25%4235%46%35%
1440
16th to endNight
16%6%35%4245%47%38%
1495
June1st to 15thNight
21%6%26%5%245%5%7%32%
1440
16th to endNight
16%6%25%425%5%5%8%36%
1440
July1st to 15thNight
10%42443445%9%45%
1440
16th to endNight
8%4245%35%5%7%9%44%
1514
August1st to 15thNight
11%6%25%6%345%5%8%40%
1528
16th to endNight
11%315%42436%7%49%
1869
September1st to 15thNight
15%5%25%5%23335%46%
1800
16th to endNight
15%42332335%6%48%
1954
October1st to 15thNight
19%7%35%334447%35%
2160
16th to endNight
25%10%35%5%33446%27%
2400
November1st to 15thNight
19%9%46%434435%34%
2511
16th to endNight
21%12%47%7%34345%25%
2730
December1st to 15thNight
22%17%48%6%3443420%
2730
16th to endNight
23%16%6%8%7%3423419%
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
21%15%5%9%6%4443419%
1552
16th to endDay
15%13%6%10%8%45%435%22%
1623
February1st to 15thDay
15%14%5%11%7%445%3422%
1575
16th to endDay
20%14%5%8%6%3433424%
1536
March1st to 15thDay
19%13%49%8%25%33326%
1854
16th to endDay
18%10%35%323335%39%
2192
April1st to 15thDay
23%11%35%42333433%
2152
16th to endDay
20%8%25%5%23445%36%
2223
May1st to 15thDay
20%7%26%5%24446%35%
2511
16th to endDay
17%6%35%5%24448%36%
2618
June1st to 15thDay
23%6%25%5%2445%7%31%
2520
16th to endDay
19%5%25%5%35%5%5%7%33%
2520
July1st to 15thDay
13%5%25%5%35%46%7%40%
2520
16th to endDay
12%5%25%5%36%5%7%9%35%
2654
August1st to 15thDay
12%6%26%6%35%5%5%7%36%
2430
16th to endDay
11%5%2443446%8%42%
2321
September1st to 15thDay
17%5%15%5%34447%40%
2160
16th to endDay
16%424323345%47%
2003
October1st to 15thDay
21%8%36%5%33446%35%
1800
16th to endDay
27%9%47%5%24445%25%
1824
November1st to 15thDay
16%6%37%7%36%446%32%
1677
16th to endDay
23%12%48%5%24336%25%
1560
December1st to 15thDay
24%16%5%7%6%2444418%
1560
16th to endDay
26%16%6%7%5%2342320%
1664
January1st to 15thNight
20%17%6%9%6%35%43419%
2716
16th to endNight
14%16%5%9%7%35%445%23%
2702
February1st to 15thNight
16%13%6%13%7%3434422%
2278
16th to endNight
17%14%6%8%6%35%33426%
1937
March1st to 15thNight
21%11%47%5%2424430%
2104
16th to endNight
19%8%35%423345%39%
2031
April1st to 15thNight
23%7%45%42434434%
1796
16th to endNight
21%7%24424346%38%
1746
May1st to 15thNight
20%5%35%4335%5%6%36%
1440
16th to endNight
17%6%25%5%25%448%38%
1495
June1st to 15thNight
21%6%35%435%46%6%32%
1440
16th to endNight
16%5%25%325%6%5%9%36%
1440
July1st to 15thNight
12%324434449%46%
1440
16th to endNight
8%4245%25%5%6%10%43%
1514
August1st to 15thNight
12%6%25%5%345%5%7%40%
1528
16th to endNight
11%415%42445%7%49%
1869
September1st to 15thNight
15%5%25%5%23335%46%
1800
16th to endNight
15%42332335%6%48%
1954
October1st to 15thNight
20%6%35%334447%36%
2160
16th to endNight
26%9%36%434346%27%
2400
November1st to 15thNight
19%9%36%5%34345%34%
2511
16th to endNight
21%12%46%7%34445%25%
2730
December1st to 15thNight
22%16%5%7%6%3334421%
2730
16th to endNight
24%16%6%7%6%3433420%
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
68%38%12%6%1
1553
16th to endDay
64%310%12%7%
1623
February1st to 15thDay
65%38%18%3
1577
16th to endDay
63%310%11%9%
1536
March1st to 15thDay
63%210%14%7%1
1854
16th to endDay
48%28%19%15%5%
2193
April1st to 15thDay
55%36%19%13%2
2152
16th to endDay
49%37%20%15%3
2223
May1st to 15thDay
50%39%21%14%1
2511
16th to endDay
46%5%12%21%11%2
2622
June1st to 15thDay
51%311%22%10%
2520
16th to endDay
48%412%21%11%
2520
July1st to 15thDay
38%5%12%30%12%
2371
16th to endDay
42%6%16%25%9%
2487
August1st to 15thDay
45%5%15%23%10%
2416
16th to endDay
37%316%30%11%
2321
September1st to 15thDay
42%410%28%13%
2160
16th to endDay
38%311%34%11%
2003
October1st to 15thDay
51%211%24%10%
1800
16th to endDay
60%412%15%6%
1824
November1st to 15thDay
50%5%13%21%8%
1677
16th to endDay
60%411%15%6%
1560
December1st to 15thDay
68%311%12%3
1560
16th to endDay
69%39%11%5%
1664
January1st to 15thNight
68%310%10%4
2716
16th to endNight
64%39%16%6%
2702
February1st to 15thNight
65%210%15%4
2287
16th to endNight
62%28%17%8%
1937
March1st to 15thNight
56%211%19%8%
2104
16th to endNight
48%29%19%15%3
2031
April1st to 15thNight
53%36%20%15%
1796
16th to endNight
47%38%20%17%3
1746
May1st to 15thNight
47%48%20%14%4
1440
16th to endNight
44%413%21%14%2
1497
June1st to 15thNight
50%414%20%10%
1440
16th to endNight
43%5%13%21%14%
1440
July1st to 15thNight
34%413%31%15%1
1360
16th to endNight
33%6%16%26%15%
1418
August1st to 15thNight
41%5%16%22%12%
1518
16th to endNight
33%315%32%14%
1869
September1st to 15thNight
40%312%30%12%
1800
16th to endNight
36%311%33%14%
1954
October1st to 15thNight
47%311%25%11%
2160
16th to endNight
58%313%18%5%
2400
November1st to 15thNight
52%213%18%10%1
2511
16th to endNight
61%311%17%5%
2730
December1st to 15thNight
67%311%13%3
2730
16th to endNight
69%39%12%4
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
24%24%28%13%8%
90
16th to endDay
32%18%32%10%4
82
February1st to 15thDay
31%27%34%6%
90
16th to endDay
33%17%25%20%2
195
March1st to 15thDay
27%18%27%19%6%
270
16th to endDay
27%16%30%14%7%3
288
April1st to 15thDay
32%18%27%12%6%1
270
16th to endDay
25%15%28%17%7%4
270
May1st to 15thDay
30%12%26%18%9%2
288
16th to endDay
24%16%30%16%10%2
331
June1st to 15thDay
27%11%28%21%9%1
315
16th to endDay
22%9%32%20%12%1
315
July1st to 15thDay
15%9%28%28%14%4
305
16th to endDay
13%7%31%30%12%4
326
August1st to 15thDay
18%427%30%15%4
313
16th to endDay
11%6%27%26%15%12%
332
September1st to 15thDay
20%423%24%12%13%
315
16th to endDay
15%9%26%21%18%8%
314
October1st to 15thDay
25%13%25%20%11%4
315
16th to endDay
35%12%28%18%4
312
November1st to 15thDay
21%13%29%24%8%2
241
16th to endDay
34%17%25%21%1
90
December1st to 15thDay
26%25%28%11%7%
90
16th to endDay
40%25%30%31
96
January1st to 15thNight
30%17%28%19%4
780
16th to endNight
24%17%31%21%4
788
February1st to 15thNight
25%16%36%19%2
704
16th to endNight
27%14%33%19%4
631
March1st to 15thNight
30%14%30%21%3
720
16th to endNight
23%15%26%24%8%
768
April1st to 15thNight
29%13%29%22%4
718
16th to endNight
27%12%29%22%7%
666
May1st to 15thNight
24%7%27%30%8%1
360
16th to endNight
19%7%36%25%10%
375
June1st to 15thNight
23%9%23%33%10%
360
16th to endNight
19%330%31%13%
360
July1st to 15thNight
12%5%23%42%14%
340
16th to endNight
9%427%42%15%1
376
August1st to 15thNight
14%424%36%18%1
447
16th to endNight
13%327%35%18%1
723
September1st to 15thNight
19%425%30%17%2
720
16th to endNight
16%8%23%24%23%2
717
October1st to 15thNight
23%10%27%21%14%1
720
16th to endNight
32%12%25%22%6%
768
November1st to 15thNight
27%12%27%21%10%
760
16th to endNight
31%15%25%17%9%
780
December1st to 15thNight
33%18%27%16%3
780
16th to endNight
35%14%27%19%2
832
Page generated at 2018-01-21 12:19:33. Version ac04

Copyright 2018 A. Danko


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