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 2024-08-15.

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	17% 10% 3 8% 5% 5% 4 4 5% 7% 32%	95693
	Night	18% 12% 4 8% 5% 4 4 3 5% 6% 31%	93025
Transparency	Day	53% 3 11% 22% 10% 1	95412
	Night	56% 3 11% 20% 10% 1	92860
Seeing	Day	25% 15% 30% 20% 8% 2	14219
	Night	25% 13% 29% 24% 8% 1	23284

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	16% 17% 5% 12% 6% 5% 5% 3 5% 4 22%	2517
	11th to 20th	Day	14% 16% 6% 13% 7% 6% 5% 3 5% 5% 20%	2520
	21st to end	Day	17% 20% 7% 12% 6% 7% 4 4 4 4 16%	2904
February	1st to 10th	Day	17% 16% 4 13% 6% 4 4 3 5% 4 23%	1710
	11th to 20th	Day	14% 16% 6% 10% 7% 4 4 3 4 5% 26%	1686
	21st to end	Day	20% 16% 5% 9% 5% 5% 5% 3 4 4 23%	1570
March	1st to 10th	Day	21% 14% 4 9% 5% 4 4 3 4 5% 27%	3116
	11th to 20th	Day	13% 18% 4 9% 6% 4 5% 3 4 5% 29%	3470
	21st to end	Day	14% 9% 3 8% 5% 4 4 3 4 6% 40%	4033
April	1st to 10th	Day	22% 13% 3 6% 5% 4 4 4 4 5% 32%	2280
	11th to 20th	Day	21% 10% 3 7% 4 4 3 3 4 5% 36%	2254
	21st to end	Day	23% 10% 3 7% 5% 4 4 4 4 5% 32%	2379
May	1st to 10th	Day	21% 9% 3 8% 6% 4 4 4 5% 6% 31%	4426
	11th to 20th	Day	18% 9% 4 9% 5% 5% 4 3 5% 7% 32%	4398
	21st to end	Day	14% 7% 2 6% 4 4 5% 5% 6% 8% 39%	4837
June	1st to 10th	Day	21% 8% 3 7% 5% 4 4 4 6% 7% 30%	2660
	11th to 20th	Day	15% 6% 3 7% 5% 4 4 4 6% 8% 38%	2660
	21st to end	Day	19% 7% 3 8% 5% 5% 5% 4 6% 7% 32%	2660
July	1st to 10th	Day	12% 7% 2 7% 5% 5% 6% 4 7% 9% 37%	4440
	11th to 20th	Day	13% 6% 2 6% 4 5% 5% 4 7% 9% 39%	4440
	21st to end	Day	11% 5% 2 6% 4 5% 5% 5% 7% 9% 41%	4814
August	1st to 10th	Day	12% 8% 2 8% 5% 5% 5% 4 6% 8% 37%	2600
	11th to 20th	Day	12% 6% 2 7% 4 5% 5% 4 6% 9% 40%	2313
	21st to end	Day	13% 6% 3 6% 4 5% 5% 4 7% 8% 39%	2376
September	1st to 10th	Day	14% 6% 2 7% 5% 4 5% 5% 5% 8% 40%	2160
	11th to 20th	Day	15% 5% 2 5% 3 4 4 3 5% 7% 46%	2154
	21st to end	Day	18% 7% 2 5% 3 5% 4 4 5% 7% 39%	1934
October	1st to 10th	Day	21% 8% 4 7% 5% 3 4 3 5% 6% 35%	1800
	11th to 20th	Day	20% 10% 3 9% 6% 4 4 3 5% 6% 29%	1800
	21st to end	Day	27% 9% 4 7% 4 4 5% 3 5% 5% 26%	1836
November	1st to 10th	Day	17% 8% 3 7% 5% 4 6% 4 5% 7% 33%	1671
	11th to 20th	Day	17% 13% 4 10% 5% 5% 5% 4 4 5% 29%	1557
	21st to end	Day	22% 14% 4 10% 5% 5% 5% 4 5% 7% 21%	1520
December	1st to 10th	Day	24% 18% 5% 10% 6% 4 4 2 5% 5% 17%	1520
	11th to 20th	Day	22% 18% 5% 10% 5% 3 3 4 3 5% 23%	1906
	21st to end	Day	27% 17% 6% 11% 4 4 3 2 2 3 20%	2772
January	1st to 10th	Night	18% 17% 7% 11% 5% 5% 4 3 4 5% 22%	4429
	11th to 20th	Night	13% 17% 6% 15% 8% 6% 6% 4 4 4 17%	4440
	21st to end	Night	19% 18% 6% 11% 7% 6% 4 3 3 4 19%	4747
February	1st to 10th	Night	17% 15% 6% 12% 7% 5% 5% 4 5% 5% 21%	2470
	11th to 20th	Night	14% 15% 6% 12% 5% 4 5% 3 5% 5% 27%	2380
	21st to end	Night	17% 14% 5% 10% 6% 6% 4 3 3 4 28%	1884
March	1st to 10th	Night	20% 12% 3 8% 6% 4 4 3 3 5% 32%	3724
	11th to 20th	Night	19% 17% 5% 9% 5% 3 3 2 4 6% 27%	3485
	21st to end	Night	16% 11% 3 8% 4 4 3 3 5% 4 39%	3598
April	1st to 10th	Night	21% 10% 4 7% 5% 4 4 3 4 5% 32%	1900
	11th to 20th	Night	21% 11% 2 8% 4 4 3 4 4 5% 35%	1875
	21st to end	Night	22% 10% 3 7% 5% 4 4 3 5% 5% 33%	1815
May	1st to 10th	Night	23% 9% 3 7% 4 4 5% 4 6% 7% 28%	2514
	11th to 20th	Night	20% 9% 4 7% 3 3 4 4 4 6% 36%	2495
	21st to end	Night	14% 7% 2 6% 4 4 4 4 6% 8% 40%	2738
June	1st to 10th	Night	17% 7% 2 7% 6% 6% 5% 4 6% 7% 32%	1520
	11th to 20th	Night	16% 6% 2 7% 4 4 5% 3 6% 9% 39%	1520
	21st to end	Night	19% 9% 2 6% 4 4 5% 4 6% 8% 34%	1520
July	1st to 10th	Night	12% 7% 3 8% 6% 5% 5% 4 6% 8% 36%	2520
	11th to 20th	Night	14% 6% 2 6% 4 5% 4 4 6% 9% 42%	2520
	21st to end	Night	10% 6% 3 7% 5% 5% 5% 4 6% 7% 41%	2739
August	1st to 10th	Night	11% 7% 3 6% 5% 5% 4 4 6% 8% 42%	1555
	11th to 20th	Night	12% 6% 2 8% 5% 4 4 3 6% 7% 43%	1669
	21st to end	Night	12% 6% 3 6% 5% 4 5% 4 5% 7% 44%	1980
September	1st to 10th	Night	13% 7% 3 6% 5% 4 4 2 4 6% 46%	1800
	11th to 20th	Night	14% 5% 2 5% 3 3 3 3 5% 7% 49%	1804
	21st to end	Night	16% 7% 3 6% 4 4 4 3 6% 6% 42%	2024
October	1st to 10th	Night	19% 7% 3 6% 4 5% 5% 4 6% 7% 34%	2160
	11th to 20th	Night	20% 9% 3 8% 4 4 4 4 6% 7% 31%	2160
	21st to end	Night	25% 11% 3 8% 4 4 3 3 5% 6% 27%	2519
November	1st to 10th	Night	18% 11% 3 6% 4 4 4 4 4 6% 36%	2407
	11th to 20th	Night	17% 12% 4 8% 5% 5% 5% 4 4 5% 32%	2622
	21st to end	Night	21% 14% 4 10% 5% 5% 4 3 6% 5% 23%	2660
December	1st to 10th	Night	21% 19% 5% 10% 6% 4 4 4 4 5% 17%	2660
	11th to 20th	Night	22% 17% 4 8% 5% 4 4 2 3 4 27%	3288
	21st to end	Night	31% 15% 5% 11% 5% 4 3 2 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	67% 2 13% 12% 5% 1	2518
	11th to 20th	Day	68% 2 10% 11% 8% 1	2520
	21st to end	Day	73% 3 10% 10% 4 1	2904
February	1st to 10th	Day	64% 3 7% 21% 5% 1	1710
	11th to 20th	Day	62% 3 9% 17% 9% 1	1695
	21st to end	Day	65% 3 10% 12% 10% 1	1570
March	1st to 10th	Day	61% 1 9% 20% 8% 1	3119
	11th to 20th	Day	60% 1 12% 14% 11% 2	3470
	21st to end	Day	48% 1 6% 24% 18% 4	4033
April	1st to 10th	Day	55% 3 6% 20% 13% 3	2280
	11th to 20th	Day	53% 2 6% 20% 17% 2	2254
	21st to end	Day	55% 3 8% 16% 14% 3	2379
May	1st to 10th	Day	55% 2 8% 22% 11% 1	4440
	11th to 20th	Day	53% 2 12% 23% 9% 1	4402
	21st to end	Day	43% 3 11% 27% 14% 1	4837
June	1st to 10th	Day	53% 3 10% 22% 12% 1	2660
	11th to 20th	Day	44% 3 11% 26% 13% 2	2660
	21st to end	Day	51% 4 12% 21% 11% 1	2660
July	1st to 10th	Day	41% 5% 13% 29% 12%	4370
	11th to 20th	Day	40% 5% 14% 32% 9%	4365
	21st to end	Day	38% 6% 13% 33% 10%	4661
August	1st to 10th	Day	44% 4 15% 26% 11%	2586
	11th to 20th	Day	40% 4 16% 28% 11% 1	2313
	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	67% 2 16% 12% 4	4429
	11th to 20th	Night	72% 2 10% 11% 5%	4440
	21st to end	Night	72% 2 9% 11% 5% 1	4747
February	1st to 10th	Night	67% 2 9% 15% 6% 1	2470
	11th to 20th	Night	60% 2 8% 21% 8%	2382
	21st to end	Night	62% 2 7% 18% 10% 1	1884
March	1st to 10th	Night	57% 1 9% 22% 9% 1	3734
	11th to 20th	Night	61% 1 13% 14% 9% 1	3486
	21st to end	Night	51% 1 4 23% 17% 3	3598
April	1st to 10th	Night	55% 3 7% 20% 13% 2	1900
	11th to 20th	Night	52% 3 7% 20% 16% 1	1875
	21st to end	Night	54% 3 7% 18% 15% 4	1815
May	1st to 10th	Night	57% 2 9% 21% 10% 3	2520
	11th to 20th	Night	50% 3 10% 24% 11% 2	2496
	21st to end	Night	43% 2 12% 23% 18% 2	2739
June	1st to 10th	Night	50% 4 13% 20% 12% 1	1520
	11th to 20th	Night	42% 3 12% 23% 17% 2	1520
	21st to end	Night	48% 5% 13% 21% 13% 1	1520
July	1st to 10th	Night	44% 5% 13% 22% 14% 1	2480
	11th to 20th	Night	38% 5% 15% 34% 8%	2472
	21st to end	Night	40% 7% 14% 24% 15%	2651
August	1st to 10th	Night	40% 5% 16% 26% 13%	1545
	11th to 20th	Night	41% 4 14% 28% 13% 1	1669
	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	35% 18% 31% 13% 3 1	180
	21st to end	Day	26% 23% 32% 13% 6%	236
February	1st to 10th	Day	34% 26% 29% 10%	270
	11th to 20th	Day	30% 28% 33% 9%	293
	21st to end	Day	36% 17% 32% 13% 1	382
March	1st to 10th	Day	29% 19% 31% 17% 3	460
	11th to 20th	Day	32% 18% 35% 11% 3 1	460
	21st to end	Day	33% 21% 26% 14% 5% 1	506
April	1st to 10th	Day	37% 17% 28% 13% 5%	460
	11th to 20th	Day	33% 20% 25% 13% 6% 4	452
	21st to end	Day	33% 17% 30% 13% 5% 2	460
May	1st to 10th	Day	27% 18% 27% 19% 8% 1	463
	11th to 20th	Day	22% 16% 34% 19% 8% 2	487
	21st to end	Day	20% 17% 29% 23% 10% 1	529
June	1st to 10th	Day	27% 12% 31% 21% 8% 1	490
	11th to 20th	Day	17% 14% 33% 23% 9% 3	490
	21st to end	Day	26% 13% 32% 18% 11% 2	490
July	1st to 10th	Day	15% 7% 31% 32% 13% 2	485
	11th to 20th	Day	15% 10% 29% 28% 14% 2	484
	21st to end	Day	14% 8% 32% 32% 10% 3	532
August	1st to 10th	Day	18% 9% 25% 31% 14% 3	486
	11th to 20th	Day	15% 4 27% 29% 17% 8%	456
	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% 16% 27% 20% 4	760
	21st to end	Night	23% 15% 34% 23% 4	836
February	1st to 10th	Night	28% 16% 34% 19% 2	760
	11th to 20th	Night	25% 18% 39% 16% 2	743
	21st to end	Night	27% 18% 31% 21% 3	628
March	1st to 10th	Night	28% 14% 31% 23% 4	760
	11th to 20th	Night	29% 18% 30% 18% 4	760
	21st to end	Night	26% 15% 30% 23% 6%	836
April	1st to 10th	Night	28% 13% 32% 23% 4	760
	11th to 20th	Night	30% 17% 27% 19% 7%	751
	21st to end	Night	28% 11% 30% 23% 7%	675
May	1st to 10th	Night	27% 8% 27% 27% 9% 1	380
	11th to 20th	Night	18% 10% 34% 30% 7%	374
	21st to end	Night	16% 9% 38% 26% 11%	411
June	1st to 10th	Night	20% 8% 27% 37% 7% 1	380
	11th to 20th	Night	17% 9% 29% 31% 13% 1	380
	21st to end	Night	24% 5% 29% 28% 13%	380
July	1st to 10th	Night	11% 6% 29% 41% 12% 1	370
	11th to 20th	Night	15% 4 26% 40% 14% 1	368
	21st to end	Night	11% 5% 31% 41% 11% 1	416
August	1st to 10th	Night	15% 5% 24% 38% 17% 1	421
	11th to 20th	Night	14% 3 23% 36% 22% 2	575
	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 2024-08-12 09:52:55. Version ac07

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