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 2026-05-17.

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% 11% 4 9% 5% 5% 4 4 5% 6% 31%	132183
	Night	17% 12% 4 9% 5% 5% 4 3 5% 6% 29%	130632
Transparency	Day	53% 4 11% 21% 10% 1	135661
	Night	56% 3 11% 20% 10% 1	135241
Seeing	Day	25% 16% 30% 19% 8% 2	16390
	Night	25% 13% 29% 24% 8% 1	25587

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	15% 19% 6% 14% 6% 5% 5% 3 5% 5% 19%	4661
	11th to 20th	Day	11% 19% 8% 16% 6% 6% 4 3 4 4 18%	4650
	21st to end	Day	11% 15% 7% 15% 9% 8% 5% 4 4 4 19%	5395
February	1st to 10th	Day	16% 15% 4 14% 6% 4 4 4 5% 4 24%	1890
	11th to 20th	Day	14% 16% 5% 11% 8% 4 4 4 4 5% 25%	1869
	21st to end	Day	20% 16% 5% 10% 6% 6% 5% 3 4 4 22%	1730
March	1st to 10th	Day	19% 14% 4 10% 5% 4 4 4 4 5% 26%	4576
	11th to 20th	Day	11% 14% 4 9% 6% 5% 6% 4 5% 6% 30%	5079
	21st to end	Day	19% 11% 3 9% 5% 4 3 3 3 5% 36%	5909
April	1st to 10th	Day	21% 13% 3 7% 5% 4 4 3 4 5% 31%	2520
	11th to 20th	Day	21% 10% 3 7% 4 4 3 3 4 5% 35%	2494
	21st to end	Day	23% 10% 3 7% 5% 4 4 3 4 5% 32%	2630
May	1st to 10th	Day	24% 11% 4 9% 6% 4 4 4 4 5% 24%	6486
	11th to 20th	Day	17% 9% 4 10% 5% 5% 4 4 5% 6% 30%	6402
	21st to end	Day	20% 9% 3 7% 4 4 5% 4 5% 7% 33%	6949
June	1st to 10th	Day	21% 8% 3 7% 5% 4 4 4 6% 7% 31%	2800
	11th to 20th	Day	14% 6% 3 7% 5% 4 4 4 6% 8% 38%	2800
	21st to end	Day	19% 8% 3 8% 5% 5% 5% 5% 6% 7% 32%	2800
July	1st to 10th	Day	12% 7% 2 8% 5% 5% 6% 4 7% 9% 34%	6360
	11th to 20th	Day	10% 5% 2 7% 4 5% 5% 4 6% 9% 42%	6360
	21st to end	Day	10% 5% 2 5% 4 4 5% 4 7% 10% 44%	6926
August	1st to 10th	Day	15% 8% 3 7% 5% 4 4 4 6% 8% 36%	4475
	11th to 20th	Day	16% 7% 3 7% 3 4 4 4 6% 9% 38%	4085
	21st to end	Day	16% 6% 2 6% 4 4 4 4 7% 9% 38%	4312
September	1st to 10th	Day	13% 6% 2 7% 5% 4 5% 4 5% 8% 41%	2400
	11th to 20th	Day	14% 5% 2 5% 4 4 4 4 5% 7% 47%	2392
	21st to end	Day	18% 6% 3 6% 4 5% 4 4 5% 7% 39%	2148
October	1st to 10th	Day	19% 8% 3 6% 5% 3 4 3 5% 6% 37%	2000
	11th to 20th	Day	19% 10% 3 9% 5% 4 4 4 5% 6% 31%	2000
	21st to end	Day	26% 9% 4 7% 4 4 5% 3 5% 5% 27%	2040
November	1st to 10th	Day	17% 9% 3 8% 5% 4 6% 4 5% 7% 32%	1851
	11th to 20th	Day	15% 14% 4 10% 5% 5% 5% 4 4 5% 29%	1720
	21st to end	Day	22% 15% 4 10% 5% 5% 5% 3 4 7% 21%	1680
December	1st to 10th	Day	21% 19% 6% 12% 6% 4 5% 3 5% 5% 16%	2680
	11th to 20th	Day	19% 17% 5% 12% 6% 4 4 3 4 4 23%	3066
	21st to end	Day	22% 16% 5% 13% 5% 4 4 3 3 4 22%	4048
January	1st to 10th	Night	14% 21% 7% 13% 6% 4 4 3 4 4 20%	8234
	11th to 20th	Night	12% 19% 7% 17% 7% 6% 5% 3 4 4 15%	8235
	21st to end	Night	14% 15% 6% 13% 7% 6% 5% 4 5% 5% 21%	8781
February	1st to 10th	Night	16% 15% 6% 12% 7% 5% 5% 3 5% 5% 21%	2730
	11th to 20th	Night	14% 15% 6% 12% 5% 5% 4 3 4 5% 27%	2637
	21st to end	Night	16% 15% 5% 10% 6% 6% 4 3 3 5% 27%	2076
March	1st to 10th	Night	21% 14% 4 9% 5% 5% 4 3 3 4 29%	5484
	11th to 20th	Night	15% 13% 4 7% 4 4 4 3 6% 8% 31%	5095
	21st to end	Night	19% 11% 4 9% 5% 4 4 3 4 5% 32%	5264
April	1st to 10th	Night	21% 10% 4 8% 5% 4 4 3 4 5% 31%	2100
	11th to 20th	Night	21% 11% 3 8% 4 3 3 3 4 5% 35%	2075
	21st to end	Night	22% 9% 3 7% 5% 4 4 3 5% 5% 34%	2006
May	1st to 10th	Night	25% 11% 3 8% 5% 5% 5% 4 6% 6% 23%	3674
	11th to 20th	Night	16% 9% 4 8% 4 4 4 4 5% 8% 36%	3623
	21st to end	Night	18% 9% 3 7% 5% 4 5% 4 6% 7% 32%	3926
June	1st to 10th	Night	17% 8% 2 7% 6% 6% 5% 4 6% 7% 32%	1600
	11th to 20th	Night	16% 6% 2 7% 4 4 5% 4 6% 9% 39%	1600
	21st to end	Night	19% 9% 2 6% 4 4 5% 5% 6% 8% 34%	1600
July	1st to 10th	Night	12% 7% 3 7% 5% 5% 5% 4 7% 9% 36%	3600
	11th to 20th	Night	13% 7% 3 6% 4 4 4 4 6% 8% 43%	3600
	21st to end	Night	9% 5% 2 7% 4 5% 5% 4 6% 8% 45%	3926
August	1st to 10th	Night	13% 8% 3 7% 5% 5% 4 3 6% 7% 41%	2671
	11th to 20th	Night	13% 7% 3 7% 5% 4 4 3 5% 6% 41%	2931
	21st to end	Night	10% 5% 3 7% 4 5% 6% 5% 6% 8% 42%	3586
September	1st to 10th	Night	13% 6% 3 7% 5% 4 4 2 4 6% 47%	2000
	11th to 20th	Night	13% 5% 2 5% 3 3 4 3 5% 7% 51%	2006
	21st to end	Night	16% 7% 2 6% 4 4 4 3 6% 6% 42%	2250
October	1st to 10th	Night	18% 7% 2 6% 4 4 4 4 5% 7% 37%	2400
	11th to 20th	Night	19% 9% 3 7% 4 4 4 4 6% 7% 33%	2400
	21st to end	Night	24% 10% 3 7% 4 4 3 3 5% 7% 29%	2799
November	1st to 10th	Night	18% 11% 3 7% 4 4 4 4 4 6% 35%	2667
	11th to 20th	Night	16% 12% 4 8% 5% 5% 4 3 4 5% 32%	2898
	21st to end	Night	21% 14% 4 10% 5% 5% 4 4 5% 5% 22%	2940
December	1st to 10th	Night	19% 18% 5% 13% 7% 5% 5% 4 4 5% 16%	4720
	11th to 20th	Night	23% 15% 4 9% 5% 4 4 3 4 4 26%	5348
	21st to end	Night	26% 16% 5% 11% 5% 4 3 3 5% 4 19%	7150

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	68% 2 12% 14% 3 1	4662
	11th to 20th	Day	71% 2 8% 10% 9% 1	4680
	21st to end	Day	70% 3 8% 9% 9% 1	5395
February	1st to 10th	Day	64% 3 7% 20% 5% 1	1890
	11th to 20th	Day	62% 3 9% 18% 8% 1	1878
	21st to end	Day	66% 3 9% 12% 9% 1	1730
March	1st to 10th	Day	62% 2 9% 15% 10% 3	4579
	11th to 20th	Day	55% 2 15% 15% 11% 1	5079
	21st to end	Day	54% 2 5% 19% 18% 3	5909
April	1st to 10th	Day	57% 3 6% 20% 13% 3	2520
	11th to 20th	Day	54% 2 6% 20% 16% 2	2494
	21st to end	Day	55% 3 7% 17% 15% 3	2630
May	1st to 10th	Day	62% 3 7% 18% 9% 1	6497
	11th to 20th	Day	54% 3 12% 20% 10% 1	6406
	21st to end	Day	51% 3 11% 24% 10% 1	6949
June	1st to 10th	Day	52% 3 10% 22% 12% 1	2800
	11th to 20th	Day	44% 4 11% 26% 13% 2	2800
	21st to end	Day	50% 5% 12% 21% 11% 1	2800
July	1st to 10th	Day	43% 5% 13% 27% 11%	6290
	11th to 20th	Day	38% 6% 13% 29% 14%	6285
	21st to end	Day	34% 6% 13% 38% 9%	6728
August	1st to 10th	Day	46% 4 15% 25% 10%	4461
	11th to 20th	Day	42% 4 14% 30% 9% 1	4124
	21st to end	Day	41% 4 16% 27% 11%	4312
September	1st to 10th	Day	40% 5% 13% 30% 12%	2400
	11th to 20th	Day	37% 3 12% 33% 15%	2392
	21st to end	Day	46% 4 12% 27% 11%	2148
October	1st to 10th	Day	45% 3 12% 30% 10%	3260
	11th to 20th	Day	48% 4 15% 26% 7% 1	3240
	21st to end	Day	48% 4 16% 24% 8%	3278
November	1st to 10th	Day	51% 4 13% 24% 7% 1	1851
	11th to 20th	Day	57% 4 11% 16% 10% 1	1720
	21st to end	Day	64% 4 13% 13% 5%	1680
December	1st to 10th	Day	71% 4 12% 11% 1	2680
	11th to 20th	Day	66% 4 10% 14% 6%	3066
	21st to end	Day	69% 3 8% 16% 5%	4048
January	1st to 10th	Night	69% 2 12% 12% 5%	8234
	11th to 20th	Night	74% 3 7% 10% 6%	8280
	21st to end	Night	66% 3 7% 13% 10% 1	8781
February	1st to 10th	Night	66% 2 9% 16% 6% 1	2730
	11th to 20th	Night	61% 2 9% 21% 7%	2639
	21st to end	Night	62% 2 7% 18% 10% 1	2076
March	1st to 10th	Night	61% 1 7% 17% 11% 3	5494
	11th to 20th	Night	51% 3 18% 16% 9% 3	5096
	21st to end	Night	56% 2 5% 22% 13% 2	5264
April	1st to 10th	Night	55% 3 7% 20% 13% 2	2100
	11th to 20th	Night	53% 3 7% 20% 16% 1	2075
	21st to end	Night	53% 2 7% 18% 16% 3	2006
May	1st to 10th	Night	61% 3 8% 18% 8% 2	3680
	11th to 20th	Night	48% 3 13% 22% 13% 1	3624
	21st to end	Night	51% 4 11% 20% 13% 1	3927
June	1st to 10th	Night	50% 4 12% 20% 12% 1	1600
	11th to 20th	Night	42% 4 12% 23% 17% 2	1600
	21st to end	Night	47% 5% 12% 21% 14% 1	1600
July	1st to 10th	Night	43% 6% 16% 21% 14% 1	3560
	11th to 20th	Night	38% 5% 14% 31% 12%	3552
	21st to end	Night	37% 6% 12% 31% 15%	3809
August	1st to 10th	Night	42% 5% 14% 27% 11%	2661
	11th to 20th	Night	43% 4 14% 30% 9% 1	2958
	21st to end	Night	39% 6% 15% 28% 12% 1	3586
September	1st to 10th	Night	40% 4 11% 31% 14% 1	2000
	11th to 20th	Night	34% 3 14% 35% 13% 1	2006
	21st to end	Night	43% 4 11% 29% 13% 1	2250
October	1st to 10th	Night	42% 4 13% 30% 11% 1	3920
	11th to 20th	Night	44% 3 15% 28% 10% 1	3899
	21st to end	Night	48% 4 17% 22% 8%	4511
November	1st to 10th	Night	52% 2 13% 22% 10% 1	2667
	11th to 20th	Night	54% 3 11% 20% 10% 1	2898
	21st to end	Night	63% 4 12% 16% 5%	2940
December	1st to 10th	Night	71% 4 10% 12% 2	4720
	11th to 20th	Night	64% 4 8% 15% 9% 1	5348
	21st to end	Night	70% 2 7% 13% 8%	7150

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	28% 21% 34% 14% 3	220
	11th to 20th	Day	35% 19% 31% 11% 3 1	220
	21st to end	Day	27% 24% 32% 12% 5%	290
February	1st to 10th	Day	32% 23% 31% 13% 2	330
	11th to 20th	Day	30% 28% 31% 10% 1	356
	21st to end	Day	35% 18% 35% 12% 1	446
March	1st to 10th	Day	29% 21% 31% 15% 3	540
	11th to 20th	Day	33% 19% 33% 11% 3 1	540
	21st to end	Day	35% 21% 26% 13% 5% 1	594
April	1st to 10th	Day	38% 18% 27% 12% 5%	540
	11th to 20th	Day	34% 21% 24% 12% 5% 3	532
	21st to end	Day	32% 19% 30% 12% 5% 1	540
May	1st to 10th	Day	29% 19% 27% 17% 7% 1	543
	11th to 20th	Day	22% 16% 34% 19% 7% 2	551
	21st to end	Day	22% 17% 28% 23% 10% 1	573
June	1st to 10th	Day	26% 14% 32% 20% 7% 1	530
	11th to 20th	Day	17% 16% 34% 22% 9% 2	530
	21st to end	Day	25% 13% 32% 18% 10% 2	530
July	1st to 10th	Day	14% 8% 33% 31% 12% 2	525
	11th to 20th	Day	15% 10% 29% 29% 14% 2	524
	21st to end	Day	14% 10% 33% 31% 10% 3	576
August	1st to 10th	Day	17% 8% 25% 33% 14% 3	526
	11th to 20th	Day	16% 5% 27% 30% 15% 7%	519
	21st to end	Day	17% 10% 31% 22% 14% 6%	583
September	1st to 10th	Day	17% 10% 31% 23% 12% 7%	530
	11th to 20th	Day	14% 6% 24% 28% 17% 11%	530
	21st to end	Day	20% 11% 30% 22% 13% 3	530
October	1st to 10th	Day	24% 14% 26% 19% 12% 5%	530
	11th to 20th	Day	27% 17% 33% 17% 5% 1	530
	21st to end	Day	33% 14% 28% 20% 4	495
November	1st to 10th	Day	29% 19% 28% 17% 5% 1	425
	11th to 20th	Day	26% 19% 32% 14% 7% 2	260
	21st to end	Day	34% 19% 34% 11% 3	220
December	1st to 10th	Day	34% 19% 29% 14% 5%	220
	11th to 20th	Day	34% 28% 28% 7% 3	220
	21st to end	Day	36% 15% 32% 12% 4 1	242
January	1st to 10th	Night	30% 18% 30% 19% 3	840
	11th to 20th	Night	33% 16% 26% 20% 3	840
	21st to end	Night	22% 16% 35% 22% 5%	924
February	1st to 10th	Night	27% 16% 33% 21% 3	840
	11th to 20th	Night	26% 17% 39% 16% 3	823
	21st to end	Night	28% 18% 31% 20% 3	692
March	1st to 10th	Night	29% 15% 31% 22% 4	840
	11th to 20th	Night	29% 18% 31% 18% 4	840
	21st to end	Night	27% 16% 30% 22% 5%	924
April	1st to 10th	Night	30% 14% 31% 22% 3	840
	11th to 20th	Night	31% 17% 27% 19% 6%	831
	21st to end	Night	28% 12% 31% 23% 6%	746
May	1st to 10th	Night	28% 9% 27% 26% 8% 1	420
	11th to 20th	Night	18% 10% 36% 29% 7%	406
	21st to end	Night	17% 9% 37% 26% 11%	433
June	1st to 10th	Night	21% 8% 28% 37% 7% 1	400
	11th to 20th	Night	17% 10% 30% 31% 12% 1	400
	21st to end	Night	23% 5% 30% 29% 13%	400
July	1st to 10th	Night	11% 6% 29% 41% 12% 1	390
	11th to 20th	Night	15% 4 26% 41% 13% 1	388
	21st to end	Night	11% 5% 31% 40% 11% 1	438
August	1st to 10th	Night	15% 5% 23% 39% 17% 1	444
	11th to 20th	Night	14% 3 23% 36% 22% 1	624
	21st to end	Night	13% 6% 30% 34% 15% 2	880
September	1st to 10th	Night	18% 6% 29% 32% 15% 1	800
	11th to 20th	Night	16% 5% 21% 30% 23% 5%	800
	21st to end	Night	19% 9% 26% 26% 19% 2	800
October	1st to 10th	Night	22% 10% 29% 21% 16% 2	800
	11th to 20th	Night	24% 12% 31% 24% 7% 1	800
	21st to end	Night	30% 13% 28% 23% 5%	880
November	1st to 10th	Night	29% 15% 28% 22% 7%	820
	11th to 20th	Night	27% 16% 30% 18% 10%	840
	21st to end	Night	32% 17% 27% 17% 6%	840
December	1st to 10th	Night	33% 17% 29% 18% 3	840
	11th to 20th	Night	30% 19% 30% 17% 3 1	840
	21st to end	Night	36% 15% 26% 19% 2	924

Page generated at 2026-05-14 01:58:54. Version ac07

Copyright © 2026 Attilla Danko.