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 2025-01-22.

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	17% 10% 3 8% 5% 4 4 4 5% 7% 32%	105295
	Night	18% 12% 4 9% 5% 4 4 3 5% 6% 30%	104073
Transparency	Day	52% 3 11% 22% 10% 1	108791
	Night	55% 3 11% 20% 10% 1	108666
Seeing	Day	25% 15% 30% 20% 8% 2	14697
	Night	25% 13% 29% 24% 8% 1	23918

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% 17% 6% 12% 6% 6% 4 3 4 4 21%	2597
	11th to 20th	Day	14% 16% 6% 13% 7% 6% 5% 3 5% 5% 20%	2600
	21st to end	Day	17% 20% 7% 12% 6% 7% 4 4 4 4 16%	2912
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	15% 9% 3 8% 5% 5% 4 4 6% 8% 35%	4338
	11th to 20th	Day	16% 7% 3 7% 3 4 4 4 6% 9% 38%	3958
	21st to end	Day	16% 6% 2 6% 4 4 4 4 7% 9% 38%	4180
September	1st to 10th	Day	14% 6% 2 7% 5% 4 5% 5% 5% 8% 41%	2280
	11th to 20th	Day	14% 5% 2 5% 4 4 4 3 5% 7% 46%	2273
	21st to end	Day	18% 7% 2 5% 4 5% 4 4 5% 6% 39%	2041
October	1st to 10th	Day	20% 8% 4 7% 6% 3 4 3 5% 6% 35%	1900
	11th to 20th	Day	20% 10% 3 9% 5% 4 4 3 5% 6% 30%	1900
	21st to end	Day	26% 9% 4 7% 4 4 5% 3 5% 5% 27%	1938
November	1st to 10th	Day	16% 8% 3 8% 5% 4 6% 4 5% 7% 33%	1761
	11th to 20th	Day	16% 13% 4 10% 5% 5% 5% 4 4 5% 30%	1638
	21st to end	Day	22% 14% 4 10% 5% 5% 5% 4 5% 7% 21%	1600
December	1st to 10th	Day	21% 19% 6% 12% 6% 4 5% 3 5% 5% 16%	2600
	11th to 20th	Day	19% 17% 5% 11% 6% 4 4 3 4 4 23%	2986
	21st to end	Day	22% 16% 5% 13% 5% 4 4 3 3 4 22%	3960
January	1st to 10th	Night	17% 18% 7% 11% 5% 5% 4 3 4 5% 21%	4569
	11th to 20th	Night	13% 17% 6% 15% 8% 6% 5% 4 4 4 17%	4580
	21st to end	Night	19% 18% 6% 11% 7% 6% 4 3 3 4 19%	4762
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	13% 8% 3 7% 5% 5% 4 3 6% 7% 40%	2588
	11th to 20th	Night	13% 8% 3 7% 5% 5% 4 3 5% 7% 40%	2839
	21st to end	Night	10% 5% 3 7% 4 5% 6% 4 6% 8% 42%	3476
September	1st to 10th	Night	13% 6% 3 6% 5% 4 4 2 4 6% 46%	1900
	11th to 20th	Night	14% 5% 2 5% 3 3 3 3 5% 7% 50%	1905
	21st to end	Night	16% 7% 3 6% 4 4 4 3 6% 6% 42%	2137
October	1st to 10th	Night	18% 7% 2 6% 5% 4 5% 4 6% 8% 35%	2280
	11th to 20th	Night	19% 9% 3 8% 4 4 4 3 6% 7% 33%	2280
	21st to end	Night	24% 11% 3 7% 4 4 3 3 5% 7% 28%	2659
November	1st to 10th	Night	18% 11% 4 7% 4 4 4 4 4 6% 35%	2537
	11th to 20th	Night	17% 12% 4 8% 5% 5% 4 3 4 5% 32%	2760
	21st to end	Night	21% 14% 4 10% 5% 5% 4 4 5% 5% 23%	2800
December	1st to 10th	Night	20% 18% 5% 13% 7% 5% 5% 4 4 5% 16%	4580
	11th to 20th	Night	23% 15% 4 9% 5% 4 4 3 4 4 26%	5208
	21st to end	Night	26% 16% 5% 11% 5% 4 3 3 5% 4 19%	6996

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	2598
	11th to 20th	Day	68% 2 10% 11% 8% 1	2600
	21st to end	Day	73% 3 10% 10% 4 1	2912
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	47% 4 15% 24% 10%	4324
	11th to 20th	Day	43% 4 15% 29% 9%	3997
	21st to end	Day	41% 4 17% 27% 11%	4180
September	1st to 10th	Day	41% 5% 13% 28% 13%	2280
	11th to 20th	Day	38% 3 12% 32% 14%	2273
	21st to end	Day	46% 4 13% 28% 10%	2041
October	1st to 10th	Day	46% 3 12% 29% 9%	3160
	11th to 20th	Day	48% 4 15% 26% 7%	3140
	21st to end	Day	48% 3 17% 24% 8%	3176
November	1st to 10th	Day	50% 4 13% 25% 7% 1	1761
	11th to 20th	Day	56% 5% 11% 17% 10% 2	1638
	21st to end	Day	64% 4 13% 14% 5%	1600
December	1st to 10th	Day	71% 4 12% 11% 1	2600
	11th to 20th	Day	66% 4 10% 14% 6%	2986
	21st to end	Day	68% 3 8% 16% 5%	3960
January	1st to 10th	Night	67% 2 16% 11% 4	4569
	11th to 20th	Night	72% 2 10% 11% 5%	4580
	21st to end	Night	72% 2 9% 11% 5% 1	4762
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	43% 5% 14% 27% 11%	2578
	11th to 20th	Night	43% 5% 14% 30% 8%	2866
	21st to end	Night	39% 6% 15% 28% 12% 1	3476
September	1st to 10th	Night	40% 4 11% 30% 14% 1	1900
	11th to 20th	Night	34% 3 15% 35% 13% 1	1905
	21st to end	Night	42% 4 11% 30% 13% 1	2137
October	1st to 10th	Night	43% 4 13% 30% 10%	3800
	11th to 20th	Night	44% 3 15% 28% 10%	3779
	21st to end	Night	49% 4 17% 21% 8%	4371
November	1st to 10th	Night	51% 2 13% 22% 10% 1	2537
	11th to 20th	Night	54% 3 11% 20% 11% 2	2760
	21st to end	Night	63% 4 12% 16% 5%	2800
December	1st to 10th	Night	72% 4 10% 12% 2	4580
	11th to 20th	Night	63% 4 8% 15% 9% 1	5208
	21st to end	Night	70% 2 7% 13% 8%	6996

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	29% 21% 35% 13% 4	200
	11th to 20th	Day	33% 19% 32% 13% 3 1	200
	21st to end	Day	26% 23% 33% 13% 6%	238
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	16% 4 27% 30% 16% 7%	479
	21st to end	Day	17% 9% 31% 22% 14% 6%	539
September	1st to 10th	Day	17% 10% 30% 24% 12% 7%	490
	11th to 20th	Day	15% 7% 24% 26% 17% 11%	490
	21st to end	Day	20% 11% 29% 23% 14% 4	490
October	1st to 10th	Day	26% 15% 25% 18% 12% 5%	490
	11th to 20th	Day	28% 17% 32% 17% 5% 1	490
	21st to end	Day	34% 13% 28% 20% 4	459
November	1st to 10th	Day	28% 19% 28% 18% 6% 1	395
	11th to 20th	Day	26% 18% 33% 15% 7% 1	238
	21st to end	Day	33% 19% 34% 12% 4	200
December	1st to 10th	Day	34% 19% 27% 16% 5%	200
	11th to 20th	Day	35% 28% 27% 8% 3	200
	21st to end	Day	35% 15% 32% 12% 5% 1	220
January	1st to 10th	Night	30% 18% 30% 19% 3	800
	11th to 20th	Night	32% 17% 27% 21% 4	800
	21st to end	Night	22% 15% 34% 23% 4	841
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	592
	21st to end	Night	13% 6% 30% 33% 15% 2	836
September	1st to 10th	Night	18% 6% 29% 32% 14% 1	760
	11th to 20th	Night	17% 6% 21% 29% 23% 5%	760
	21st to end	Night	19% 9% 26% 26% 19% 2	760
October	1st to 10th	Night	23% 10% 29% 21% 15% 2	760
	11th to 20th	Night	25% 12% 31% 24% 8% 1	760
	21st to end	Night	30% 14% 28% 23% 5%	836
November	1st to 10th	Night	27% 15% 28% 22% 7% 1	780
	11th to 20th	Night	27% 15% 30% 18% 10%	800
	21st to end	Night	33% 17% 27% 17% 6%	800
December	1st to 10th	Night	34% 17% 29% 18% 3	800
	11th to 20th	Night	31% 18% 30% 17% 3 1	800
	21st to end	Night	36% 15% 27% 20% 3	880

Page generated at 2025-01-19 03:06:47. Version ac07

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