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 2005-11-06 to 2024-01-22.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	18% 10% 4 7% 6% 3 5% 4 5% 6% 33%	74808
	Night	18% 11% 4 7% 6% 3 4 4 5% 6% 32%	75122
Transparency	Day	52% 3 11% 21% 11% 1	74513
	Night	55% 3 11% 20% 10% 1	74951
Seeing	Day	25% 15% 30% 19% 8% 2	13429
	Night	25% 13% 29% 24% 8% 1	22671

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	17% 18% 6% 12% 7% 4 5% 4 5% 4 20%	1517
	11th to 20th	Day	19% 17% 6% 9% 8% 4 4 4 4 4 21%	1520
	21st to end	Day	14% 14% 6% 10% 8% 5% 6% 5% 5% 5% 23%	1668
February	1st to 10th	Day	18% 15% 5% 12% 7% 3 4 5% 5% 4 22%	1620
	11th to 20th	Day	15% 16% 6% 9% 8% 3 4 4 4 5% 26%	1595
	21st to end	Day	21% 15% 6% 9% 6% 5% 4 5% 4 4 22%	1480
March	1st to 10th	Day	15% 14% 6% 10% 7% 3 4 5% 4 4 28%	1797
	11th to 20th	Day	18% 13% 4 8% 7% 3 4 4 4 5% 31%	1970
	21st to end	Day	20% 12% 3 6% 4 3 3 3 3 5% 37%	2299
April	1st to 10th	Day	22% 11% 4 5% 5% 3 4 4 4 5% 33%	2160
	11th to 20th	Day	21% 8% 4 7% 5% 3 4 4 4 5% 37%	2134
	21st to end	Day	24% 9% 3 6% 6% 3 4 5% 4 5% 32%	2253
May	1st to 10th	Day	20% 7% 3 6% 6% 3 4 5% 4 6% 36%	2520
	11th to 20th	Day	17% 7% 3 7% 4 3 4 3 5% 7% 39%	2478
	21st to end	Day	15% 7% 3 5% 5% 3 5% 5% 6% 8% 39%	2725
June	1st to 10th	Day	22% 7% 3 7% 5% 4 4 5% 6% 7% 30%	2520
	11th to 20th	Day	16% 6% 3 5% 6% 3 4 4 5% 8% 38%	2520
	21st to end	Day	19% 7% 3 6% 6% 4 6% 5% 6% 7% 32%	2520
July	1st to 10th	Day	12% 6% 2 6% 5% 3 5% 4 6% 8% 43%	2520
	11th to 20th	Day	12% 6% 3 5% 5% 3 6% 5% 7% 10% 38%	2520
	21st to end	Day	11% 5% 2 5% 5% 4 6% 6% 8% 10% 37%	2744
August	1st to 10th	Day	11% 7% 2 6% 7% 4 5% 5% 6% 8% 38%	2463
	11th to 20th	Day	12% 6% 2 6% 5% 4 5% 5% 6% 9% 39%	2259
	21st to end	Day	14% 6% 3 5% 5% 3 5% 4 7% 8% 39%	2376
September	1st to 10th	Day	14% 6% 2 5% 6% 3 5% 6% 5% 8% 40%	2160
	11th to 20th	Day	15% 5% 2 4 4 3 4 4 5% 8% 46%	2154
	21st to end	Day	18% 6% 3 4 4 4 5% 5% 5% 7% 39%	1934
October	1st to 10th	Day	21% 8% 4 6% 6% 2 3 4 5% 6% 35%	1800
	11th to 20th	Day	21% 10% 4 8% 7% 3 4 5% 5% 6% 29%	1800
	21st to end	Day	27% 9% 4 7% 5% 3 5% 4 5% 5% 26%	1836
November	1st to 10th	Day	17% 7% 4 7% 6% 3 6% 5% 5% 7% 33%	1671
	11th to 20th	Day	17% 12% 4 8% 7% 4 5% 5% 4 5% 29%	1557
	21st to end	Day	22% 13% 5% 8% 6% 4 5% 4 5% 7% 21%	1520
December	1st to 10th	Day	25% 16% 5% 10% 7% 3 5% 3 5% 5% 17%	1520
	11th to 20th	Day	22% 17% 5% 8% 7% 3 3 4 3 5% 23%	1906
	21st to end	Day	27% 16% 6% 10% 5% 3 4 3 2 3 20%	2772
January	1st to 10th	Night	19% 17% 7% 11% 7% 3 5% 4 4 4 19%	2649
	11th to 20th	Night	18% 17% 5% 10% 7% 4 5% 5% 4 4 20%	2660
	21st to end	Night	13% 14% 5% 10% 8% 4 5% 4 3 5% 27%	2717
February	1st to 10th	Night	18% 14% 6% 12% 8% 4 5% 5% 5% 4 20%	2340
	11th to 20th	Night	15% 13% 6% 11% 6% 3 5% 4 4 5% 28%	2251
	21st to end	Night	18% 13% 6% 8% 6% 4 5% 4 3 5% 28%	1776
March	1st to 10th	Night	17% 14% 5% 8% 7% 3 4 4 4 5% 29%	2150
	11th to 20th	Night	18% 14% 4 8% 5% 3 4 3 4 5% 33%	1985
	21st to end	Night	20% 10% 3 7% 5% 3 3 3 4 4 38%	2056
April	1st to 10th	Night	21% 8% 5% 6% 6% 3 4 4 4 5% 33%	1800
	11th to 20th	Night	21% 9% 2 7% 5% 3 3 4 4 6% 36%	1775
	21st to end	Night	22% 10% 3 6% 6% 3 4 4 5% 6% 32%	1720
May	1st to 10th	Night	23% 6% 3 5% 5% 3 4 5% 5% 7% 35%	1440
	11th to 20th	Night	15% 8% 3 6% 4 3 5% 5% 3 7% 40%	1415
	21st to end	Night	14% 5% 3 5% 5% 3 4 5% 5% 7% 44%	1550
June	1st to 10th	Night	18% 6% 3 6% 6% 4 5% 5% 6% 7% 33%	1440
	11th to 20th	Night	16% 6% 2 6% 4 3 5% 5% 5% 9% 40%	1440
	21st to end	Night	18% 8% 2 5% 4 3 5% 6% 6% 8% 35%	1440
July	1st to 10th	Night	9% 5% 3 5% 5% 4 5% 4 5% 8% 46%	1440
	11th to 20th	Night	12% 5% 2 4 5% 4 5% 5% 6% 10% 43%	1440
	21st to end	Night	10% 5% 3 5% 5% 3 6% 5% 6% 9% 44%	1574
August	1st to 10th	Night	11% 7% 2 5% 6% 4 5% 5% 7% 8% 42%	1472
	11th to 20th	Night	12% 6% 2 7% 6% 3 4 4 6% 7% 43%	1624
	21st to end	Night	12% 6% 3 6% 5% 3 5% 4 5% 7% 44%	1980
September	1st to 10th	Night	13% 6% 3 6% 6% 4 4 3 4 6% 46%	1800
	11th to 20th	Night	15% 4 2 4 4 2 3 4 5% 7% 49%	1804
	21st to end	Night	16% 7% 3 5% 5% 3 4 4 6% 7% 42%	2024
October	1st to 10th	Night	19% 7% 3 6% 5% 3 4 5% 5% 7% 34%	2160
	11th to 20th	Night	20% 9% 3 7% 5% 3 4 5% 6% 7% 32%	2160
	21st to end	Night	25% 10% 3 6% 6% 3 3 4 5% 6% 28%	2519
November	1st to 10th	Night	19% 10% 4 6% 5% 3 4 4 4 6% 36%	2407
	11th to 20th	Night	17% 11% 4 7% 6% 3 5% 5% 4 6% 32%	2622
	21st to end	Night	22% 13% 4 8% 7% 3 5% 4 5% 5% 23%	2660
December	1st to 10th	Night	22% 18% 5% 9% 7% 3 4 5% 4 5% 17%	2660
	11th to 20th	Night	23% 16% 5% 7% 6% 3 4 3 3 4 27%	3288
	21st to end	Night	32% 14% 5% 10% 6% 3 3 3 4 4 17%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	69% 2 10% 13% 5% 1	1518
	11th to 20th	Day	67% 3 8% 11% 9% 1	1520
	21st to end	Day	64% 3 10% 15% 7% 1	1668
February	1st to 10th	Day	65% 3 7% 19% 5% 1	1620
	11th to 20th	Day	61% 3 9% 17% 9% 1	1604
	21st to end	Day	66% 3 9% 12% 9% 1	1480
March	1st to 10th	Day	61% 3 9% 17% 10% 1	1800
	11th to 20th	Day	58% 2 10% 15% 12% 3	1970
	21st to end	Day	53% 2 7% 18% 15% 5%	2299
April	1st to 10th	Day	55% 3 6% 20% 13% 3	2160
	11th to 20th	Day	52% 2 6% 21% 17% 2	2134
	21st to end	Day	55% 3 8% 16% 15% 4	2253
May	1st to 10th	Day	50% 3 8% 19% 16% 3	2520
	11th to 20th	Day	46% 3 9% 25% 15% 2	2482
	21st to end	Day	43% 5% 14% 22% 13% 2	2725
June	1st to 10th	Day	52% 3 11% 21% 12% 1	2520
	11th to 20th	Day	44% 3 11% 26% 14% 2	2520
	21st to end	Day	50% 4 13% 20% 11% 1	2520
July	1st to 10th	Day	38% 5% 11% 31% 15% 1	2450
	11th to 20th	Day	40% 4 16% 30% 10%	2445
	21st to end	Day	41% 5% 16% 26% 10% 1	2591
August	1st to 10th	Day	43% 4 15% 27% 10%	2449
	11th to 20th	Day	41% 4 16% 27% 11% 1	2259
	21st to end	Day	41% 3 14% 29% 12%	2376
September	1st to 10th	Day	41% 5% 13% 28% 13%	2160
	11th to 20th	Day	39% 3 11% 32% 14%	2154
	21st to end	Day	45% 4 13% 29% 9%	1934
October	1st to 10th	Day	51% 3 11% 24% 12%	1800
	11th to 20th	Day	57% 3 13% 19% 6% 1	1800
	21st to end	Day	61% 3 10% 17% 9%	1836
November	1st to 10th	Day	50% 3 13% 24% 7% 1	1671
	11th to 20th	Day	57% 5% 11% 16% 10% 2	1557
	21st to end	Day	64% 4 13% 14% 6%	1520
December	1st to 10th	Day	71% 3 11% 12% 2	1520
	11th to 20th	Day	67% 3 13% 14% 3	1906
	21st to end	Day	73% 2 7% 14% 4	2772
January	1st to 10th	Night	69% 3 11% 12% 5%	2649
	11th to 20th	Night	68% 4 9% 11% 7% 1	2660
	21st to end	Night	61% 3 8% 17% 9% 1	2717
February	1st to 10th	Night	68% 2 9% 14% 6% 1	2340
	11th to 20th	Night	60% 2 9% 21% 7%	2253
	21st to end	Night	62% 2 7% 17% 10% 1	1776
March	1st to 10th	Night	59% 2 10% 16% 11% 1	2160
	11th to 20th	Night	55% 2 10% 19% 12% 2	1986
	21st to end	Night	52% 2 6% 21% 16% 4	2056
April	1st to 10th	Night	54% 3 7% 20% 14% 2	1800
	11th to 20th	Night	51% 3 8% 20% 17% 1	1775
	21st to end	Night	54% 3 7% 17% 15% 4	1720
May	1st to 10th	Night	49% 3 7% 20% 16% 5%	1440
	11th to 20th	Night	44% 4 7% 24% 18% 3	1416
	21st to end	Night	39% 4 16% 21% 16% 3	1551
June	1st to 10th	Night	49% 5% 13% 21% 11% 1	1440
	11th to 20th	Night	43% 3 12% 23% 17% 2	1440
	21st to end	Night	46% 5% 13% 21% 14% 1	1440
July	1st to 10th	Night	35% 5% 12% 29% 17% 2	1400
	11th to 20th	Night	37% 4 14% 32% 13%	1392
	21st to end	Night	37% 6% 15% 28% 14% 1	1486
August	1st to 10th	Night	39% 5% 17% 25% 13%	1462
	11th to 20th	Night	41% 4 14% 27% 13% 1	1624
	21st to end	Night	39% 4 14% 29% 13% 1	1980
September	1st to 10th	Night	41% 4 12% 29% 14% 1	1800
	11th to 20th	Night	35% 3 15% 34% 12% 1	1804
	21st to end	Night	42% 3 11% 31% 12% 1	2024
October	1st to 10th	Night	49% 4 11% 23% 13% 1	2160
	11th to 20th	Night	52% 3 13% 22% 9%	2160
	21st to end	Night	58% 3 14% 15% 9% 1	2519
November	1st to 10th	Night	51% 2 13% 21% 11% 1	2407
	11th to 20th	Night	54% 3 11% 20% 10% 2	2622
	21st to end	Night	63% 4 12% 16% 5%	2660
December	1st to 10th	Night	70% 3 10% 14% 3	2660
	11th to 20th	Night	64% 2 10% 17% 7% 1	3288
	21st to end	Night	73% 2 8% 14% 2	4884

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	30% 21% 31% 14% 4	180
	11th to 20th	Day	34% 18% 31% 13% 3 1	180
	21st to end	Day	25% 25% 32% 12% 7%	212
February	1st to 10th	Day	36% 28% 30% 6%	240
	11th to 20th	Day	32% 27% 34% 6%	262
	21st to end	Day	37% 17% 31% 14% 1	346
March	1st to 10th	Day	28% 19% 33% 17% 3	420
	11th to 20th	Day	32% 18% 34% 11% 3 1	420
	21st to end	Day	34% 19% 25% 15% 6% 2	462
April	1st to 10th	Day	35% 17% 28% 14% 6%	420
	11th to 20th	Day	32% 19% 25% 14% 6% 4	412
	21st to end	Day	33% 16% 31% 13% 5% 2	420
May	1st to 10th	Day	28% 18% 28% 17% 7% 1	423
	11th to 20th	Day	21% 17% 34% 18% 7% 2	447
	21st to end	Day	21% 18% 28% 21% 11% 1	485
June	1st to 10th	Day	27% 13% 31% 20% 8% 1	450
	11th to 20th	Day	18% 14% 32% 24% 9% 3	450
	21st to end	Day	24% 12% 32% 19% 12% 2	450
July	1st to 10th	Day	15% 6% 30% 33% 14% 2	445
	11th to 20th	Day	16% 10% 28% 29% 15% 2	444
	21st to end	Day	14% 9% 33% 32% 9% 3	488
August	1st to 10th	Day	17% 8% 26% 32% 14% 3	446
	11th to 20th	Day	15% 4 28% 29% 16% 7%	439
	21st to end	Day	17% 10% 32% 21% 14% 7%	495
September	1st to 10th	Day	16% 10% 31% 24% 12% 8%	450
	11th to 20th	Day	16% 7% 26% 27% 14% 10%	450
	21st to end	Day	20% 11% 30% 22% 13% 4	450
October	1st to 10th	Day	27% 15% 23% 18% 12% 5%	450
	11th to 20th	Day	29% 16% 31% 18% 4 1	450
	21st to end	Day	35% 13% 27% 21% 4	423
November	1st to 10th	Day	27% 19% 28% 19% 6% 1	365
	11th to 20th	Day	28% 18% 32% 14% 7% 1	217
	21st to end	Day	30% 19% 34% 13% 4	180
December	1st to 10th	Day	35% 17% 29% 15% 4	180
	11th to 20th	Day	34% 28% 27% 8% 2	180
	21st to end	Day	37% 16% 32% 11% 3 1	198
January	1st to 10th	Night	30% 18% 29% 20% 3	760
	11th to 20th	Night	32% 17% 27% 20% 4	760
	21st to end	Night	22% 16% 35% 23% 5%	800
February	1st to 10th	Night	28% 17% 34% 18% 2	720
	11th to 20th	Night	25% 17% 39% 16% 3	703
	21st to end	Night	27% 18% 31% 20% 3	592
March	1st to 10th	Night	28% 15% 31% 24% 3	720
	11th to 20th	Night	29% 18% 30% 18% 5%	720
	21st to end	Night	26% 14% 30% 23% 6%	792
April	1st to 10th	Night	28% 13% 31% 23% 4	720
	11th to 20th	Night	29% 17% 27% 20% 7%	711
	21st to end	Night	29% 11% 30% 23% 7%	640
May	1st to 10th	Night	27% 8% 27% 28% 9% 1	360
	11th to 20th	Night	18% 10% 36% 29% 7%	354
	21st to end	Night	16% 9% 38% 24% 12% 1	389
June	1st to 10th	Night	21% 8% 27% 37% 7% 1	360
	11th to 20th	Night	18% 9% 29% 30% 13% 1	360
	21st to end	Night	22% 5% 29% 30% 14%	360
July	1st to 10th	Night	11% 6% 29% 41% 12% 1	350
	11th to 20th	Night	15% 4 26% 41% 14% 1	348
	21st to end	Night	11% 5% 31% 41% 11% 1	394
August	1st to 10th	Night	15% 5% 24% 37% 18% 1	398
	11th to 20th	Night	15% 3 23% 37% 21% 2	560
	21st to end	Night	14% 6% 30% 33% 15% 2	792
September	1st to 10th	Night	18% 6% 28% 32% 14% 2	720
	11th to 20th	Night	18% 6% 23% 30% 20% 4	720
	21st to end	Night	18% 9% 27% 25% 19% 2	720
October	1st to 10th	Night	23% 11% 29% 20% 15% 2	720
	11th to 20th	Night	26% 12% 31% 24% 8% 1	720
	21st to end	Night	31% 13% 28% 23% 5%	792
November	1st to 10th	Night	27% 15% 29% 22% 8% 1	740
	11th to 20th	Night	27% 16% 29% 18% 10%	760
	21st to end	Night	32% 17% 28% 17% 6%	760
December	1st to 10th	Night	34% 17% 29% 18% 3	760
	11th to 20th	Night	30% 19% 30% 17% 3 1	760
	21st to end	Night	37% 15% 26% 20% 2	836

Page generated at 2024-01-19 09:28:30. Version ac07

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