Laconia
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Laconia clear sky chart from 2005-11-06 to 2025-12-03.

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% 8% 3 7% 5% 4 5% 4 6% 7% 36%	126847
	Night	17% 8% 3 7% 5% 4 4 4 5% 6% 37%	123859
Transparency	Day	46% 5% 11% 22% 14% 2	130354
	Night	46% 5% 11% 21% 14% 2	128426
Seeing	Day	24% 14% 28% 21% 10% 3	16269
	Night	22% 13% 28% 26% 9% 1	25145

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	13% 11% 4 10% 6% 5% 4 4 5% 5% 34%	3597
	11th to 20th	Day	13% 8% 5% 9% 5% 3 4 3 6% 7% 38%	3570
	21st to end	Day	12% 9% 3 8% 4 4 4 4 5% 6% 41%	3960
February	1st to 10th	Day	15% 9% 3 7% 5% 6% 5% 4 5% 6% 34%	1786
	11th to 20th	Day	12% 9% 2 9% 6% 5% 5% 4 5% 7% 36%	1948
	21st to end	Day	15% 11% 3 8% 5% 5% 5% 4 6% 5% 34%	1650
March	1st to 10th	Day	18% 12% 3 9% 5% 4 5% 3 5% 4 31%	4476
	11th to 20th	Day	16% 10% 3 7% 4 5% 5% 4 5% 6% 35%	4746
	21st to end	Day	24% 8% 2 7% 4 4 4 3 5% 7% 31%	5804
April	1st to 10th	Day	19% 10% 2 6% 5% 4 4 3 4 6% 36%	2400
	11th to 20th	Day	18% 7% 2 6% 6% 4 4 3 6% 7% 37%	2404
	21st to end	Day	21% 7% 3 7% 5% 5% 5% 3 5% 5% 34%	2600
May	1st to 10th	Day	33% 9% 3 7% 4 4 5% 3 5% 5% 22%	5886
	11th to 20th	Day	20% 8% 3 9% 5% 5% 5% 4 6% 7% 29%	6128
	21st to end	Day	20% 6% 2 6% 5% 5% 5% 4 6% 8% 33%	6949
June	1st to 10th	Day	20% 6% 3 7% 5% 5% 5% 4 6% 8% 31%	2800
	11th to 20th	Day	17% 6% 2 6% 6% 5% 4 4 5% 7% 38%	2800
	21st to end	Day	18% 7% 2 6% 5% 5% 6% 4 7% 7% 33%	2800
July	1st to 10th	Day	17% 6% 3 7% 5% 5% 5% 5% 7% 9% 32%	6360
	11th to 20th	Day	11% 5% 2 7% 5% 5% 5% 5% 8% 10% 38%	6360
	21st to end	Day	14% 5% 2 6% 4 4 5% 3 6% 8% 43%	6926
August	1st to 10th	Day	15% 6% 2 7% 5% 5% 5% 4 6% 8% 37%	4372
	11th to 20th	Day	15% 8% 3 7% 5% 4 5% 4 6% 9% 34%	4157
	21st to end	Day	8% 5% 2 6% 5% 5% 5% 4 7% 9% 46%	4312
September	1st to 10th	Day	12% 3 2 5% 4 5% 5% 4 6% 7% 47%	2400
	11th to 20th	Day	13% 5% 1 4 3 3 3 3 5% 5% 53%	2210
	21st to end	Day	16% 5% 2 6% 4 3 3 4 5% 7% 46%	2200
October	1st to 10th	Day	20% 7% 2 6% 4 4 4 4 4 5% 39%	2200
	11th to 20th	Day	16% 7% 2 5% 5% 4 4 4 5% 7% 42%	1915
	21st to end	Day	22% 8% 3 7% 4 3 4 3 5% 5% 35%	1980
November	1st to 10th	Day	14% 8% 2 5% 4 4 3 3 5% 7% 44%	1851
	11th to 20th	Day	17% 6% 2 6% 4 3 4 4 5% 6% 42%	1890
	21st to end	Day	21% 9% 2 6% 4 4 4 4 5% 6% 35%	1848
December	1st to 10th	Day	15% 10% 4 8% 4 5% 5% 4 6% 7% 31%	2616
	11th to 20th	Day	18% 8% 3 6% 4 4 4 3 5% 6% 39%	2986
	21st to end	Day	20% 11% 3 7% 4 4 4 3 4 5% 35%	3960
January	1st to 10th	Night	13% 8% 5% 9% 5% 6% 5% 3 5% 6% 36%	6349
	11th to 20th	Night	11% 11% 3 10% 6% 5% 5% 4 6% 7% 30%	6315
	21st to end	Night	14% 9% 3 8% 5% 5% 5% 4 5% 6% 37%	6996
February	1st to 10th	Night	15% 9% 3 7% 4 4 5% 4 7% 7% 34%	2609
	11th to 20th	Night	12% 9% 3 7% 5% 4 5% 4 6% 8% 38%	2338
	21st to end	Night	13% 10% 3 6% 5% 5% 4 4 5% 7% 38%	1980
March	1st to 10th	Night	22% 10% 3 7% 4 4 4 3 5% 5% 31%	5364
	11th to 20th	Night	14% 10% 4 8% 6% 5% 5% 4 5% 6% 34%	5211
	21st to end	Night	26% 8% 2 6% 4 3 3 4 5% 6% 32%	5110
April	1st to 10th	Night	21% 9% 3 6% 5% 4 4 4 4 5% 36%	2000
	11th to 20th	Night	19% 11% 3 6% 4 4 3 3 4 6% 36%	1945
	21st to end	Night	21% 8% 3 6% 4 3 4 4 4 7% 37%	1800
May	1st to 10th	Night	35% 9% 3 6% 4 4 4 3 5% 6% 22%	4054
	11th to 20th	Night	16% 10% 3 8% 6% 6% 6% 4 6% 7% 28%	3808
	21st to end	Night	20% 8% 3 7% 5% 5% 5% 3 5% 7% 32%	3926
June	1st to 10th	Night	20% 9% 2 7% 5% 5% 4 3 5% 6% 34%	1600
	11th to 20th	Night	18% 5% 2 6% 4 5% 5% 4 6% 7% 37%	1600
	21st to end	Night	18% 6% 1 6% 5% 4 5% 4 7% 8% 37%	1600
July	1st to 10th	Night	13% 6% 2 6% 5% 4 5% 5% 7% 9% 39%	3600
	11th to 20th	Night	12% 6% 2 8% 6% 5% 4 4 6% 8% 38%	3600
	21st to end	Night	11% 5% 2 5% 4 4 4 4 5% 6% 51%	3926
August	1st to 10th	Night	22% 8% 2 7% 4 4 3 3 5% 6% 36%	2745
	11th to 20th	Night	13% 7% 3 8% 5% 4 6% 4 6% 7% 37%	2887
	21st to end	Night	9% 4 2 5% 4 4 4 4 6% 8% 51%	3586
September	1st to 10th	Night	12% 5% 2 5% 3 4 3 3 4 6% 53%	2000
	11th to 20th	Night	14% 5% 1 4 3 3 3 3 5% 6% 53%	2190
	21st to end	Night	17% 5% 2 5% 4 3 4 3 5% 6% 46%	2200
October	1st to 10th	Night	20% 7% 2 7% 4 4 5% 3 4 6% 40%	2200
	11th to 20th	Night	16% 7% 2 6% 4 5% 5% 4 5% 7% 40%	2480
	21st to end	Night	22% 8% 2 7% 4 5% 4 3 5% 6% 35%	2860
November	1st to 10th	Night	14% 7% 2 6% 4 3 4 3 5% 7% 44%	2667
	11th to 20th	Night	15% 7% 2 6% 4 4 4 4 5% 6% 42%	2730
	21st to end	Night	16% 7% 3 7% 5% 5% 4 4 5% 6% 38%	2770
December	1st to 10th	Night	14% 12% 5% 9% 5% 5% 4 3 5% 6% 32%	4609
	11th to 20th	Night	22% 9% 3 7% 4 3 4 3 4 5% 37%	5208
	21st to end	Night	20% 11% 3 7% 4 4 3 3 4 4 36%	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	51% 4 9% 24% 12% 1	3598
	11th to 20th	Day	45% 4 13% 22% 13% 3	3600
	21st to end	Day	44% 5% 9% 22% 18% 3	3960
February	1st to 10th	Day	49% 6% 12% 21% 11% 2	1786
	11th to 20th	Day	46% 6% 12% 20% 13% 3	1957
	21st to end	Day	50% 5% 10% 20% 14% 2	1650
March	1st to 10th	Day	56% 4 8% 14% 10% 8%	4479
	11th to 20th	Day	48% 5% 14% 19% 11% 3	4746
	21st to end	Day	52% 3 6% 18% 18% 4	5804
April	1st to 10th	Day	49% 4 8% 20% 15% 4	2400
	11th to 20th	Day	45% 5% 11% 20% 17% 2	2404
	21st to end	Day	51% 5% 8% 18% 15% 3	2600
May	1st to 10th	Day	63% 6% 9% 14% 7% 1	5897
	11th to 20th	Day	53% 6% 14% 16% 9% 2	6132
	21st to end	Day	47% 6% 13% 22% 12% 1	6949
June	1st to 10th	Day	50% 6% 11% 21% 12% 1	2800
	11th to 20th	Day	44% 5% 12% 21% 15% 3	2800
	21st to end	Day	48% 6% 11% 20% 13% 2	2800
July	1st to 10th	Day	48% 5% 13% 20% 14% 1	6290
	11th to 20th	Day	40% 6% 15% 24% 14% 1	6285
	21st to end	Day	40% 4 12% 28% 15% 1	6728
August	1st to 10th	Day	45% 6% 14% 23% 12% 1	4358
	11th to 20th	Day	46% 5% 15% 25% 8% 1	4196
	21st to end	Day	35% 5% 14% 28% 17% 2	4312
September	1st to 10th	Day	35% 5% 12% 29% 18% 1	2400
	11th to 20th	Day	32% 4 9% 29% 23% 2	2210
	21st to end	Day	39% 4 10% 26% 19% 2	2200
October	1st to 10th	Day	46% 5% 7% 23% 17% 1	3590
	11th to 20th	Day	40% 4 11% 26% 15% 3	3092
	21st to end	Day	38% 3 8% 30% 17% 3	3180
November	1st to 10th	Day	40% 4 14% 25% 16% 2	1851
	11th to 20th	Day	41% 5% 10% 21% 21% 3	1890
	21st to end	Day	49% 5% 15% 20% 10% 1	1848
December	1st to 10th	Day	50% 5% 14% 23% 7% 1	2616
	11th to 20th	Day	46% 4 10% 18% 19% 3	2986
	21st to end	Day	52% 4 7% 18% 13% 5%	3960
January	1st to 10th	Night	47% 5% 11% 24% 11% 1	6349
	11th to 20th	Night	50% 6% 12% 19% 11% 2	6360
	21st to end	Night	48% 4 9% 18% 17% 4	6996
February	1st to 10th	Night	46% 6% 12% 20% 14% 2	2609
	11th to 20th	Night	44% 6% 11% 22% 15% 3	2340
	21st to end	Night	45% 4 11% 23% 12% 4	1980
March	1st to 10th	Night	53% 4 9% 14% 14% 5%	5374
	11th to 20th	Night	49% 6% 15% 16% 12% 2	5212
	21st to end	Night	52% 3 6% 14% 21% 4	5110
April	1st to 10th	Night	50% 5% 9% 17% 16% 2	2000
	11th to 20th	Night	49% 4 8% 21% 17% 1	1945
	21st to end	Night	47% 5% 10% 18% 17% 3	1800
May	1st to 10th	Night	63% 6% 10% 13% 7% 1	4060
	11th to 20th	Night	53% 8% 12% 18% 9% 1	3809
	21st to end	Night	51% 6% 14% 18% 9% 1	3927
June	1st to 10th	Night	49% 7% 10% 21% 13% 1	1600
	11th to 20th	Night	45% 8% 14% 19% 13% 2	1600
	21st to end	Night	44% 8% 13% 23% 11% 1	1600
July	1st to 10th	Night	40% 6% 16% 26% 12%	3560
	11th to 20th	Night	44% 6% 14% 20% 15%	3552
	21st to end	Night	34% 4 13% 35% 13% 1	3809
August	1st to 10th	Night	51% 5% 12% 21% 10% 1	2735
	11th to 20th	Night	45% 7% 17% 20% 11% 1	2914
	21st to end	Night	30% 5% 18% 29% 17% 1	3586
September	1st to 10th	Night	34% 5% 13% 29% 19% 1	2000
	11th to 20th	Night	32% 5% 11% 28% 22% 2	2190
	21st to end	Night	38% 5% 11% 28% 17% 2	2200
October	1st to 10th	Night	43% 5% 12% 25% 13% 1	3590
	11th to 20th	Night	38% 5% 10% 26% 18% 3	4029
	21st to end	Night	40% 4 9% 30% 15% 2	4610
November	1st to 10th	Night	41% 5% 11% 26% 16% 2	2667
	11th to 20th	Night	42% 6% 11% 22% 18% 2	2730
	21st to end	Night	45% 6% 15% 23% 10% 1	2770
December	1st to 10th	Night	53% 4 11% 25% 6%	4609
	11th to 20th	Night	50% 4 11% 15% 19% 2	5208
	21st to end	Night	52% 3 8% 20% 15% 3	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	30% 21% 28% 19% 3 1	200
	11th to 20th	Day	30% 20% 29% 18% 3 2	200
	21st to end	Day	23% 20% 29% 19% 8% 1	220
February	1st to 10th	Day	30% 20% 32% 15% 4	338
	11th to 20th	Day	27% 26% 30% 14% 2	496
	21st to end	Day	28% 22% 30% 17% 3	414
March	1st to 10th	Day	30% 16% 34% 16% 5%	500
	11th to 20th	Day	26% 23% 30% 14% 5% 1	500
	21st to end	Day	29% 18% 29% 16% 6% 3	550
April	1st to 10th	Day	31% 20% 28% 12% 7% 2	500
	11th to 20th	Day	30% 18% 27% 16% 6% 2	492
	21st to end	Day	30% 18% 25% 16% 8% 2	500
May	1st to 10th	Day	32% 17% 22% 21% 6% 2	503
	11th to 20th	Day	23% 15% 31% 19% 10% 3	527
	21st to end	Day	22% 11% 31% 23% 11% 3	573
June	1st to 10th	Day	21% 11% 33% 22% 11% 3	530
	11th to 20th	Day	18% 14% 26% 27% 12% 3	530
	21st to end	Day	22% 9% 32% 22% 11% 4	530
July	1st to 10th	Day	19% 8% 30% 23% 15% 5%	525
	11th to 20th	Day	15% 6% 29% 32% 15% 4	524
	21st to end	Day	14% 7% 31% 30% 14% 3	576
August	1st to 10th	Day	13% 8% 25% 29% 19% 5%	526
	11th to 20th	Day	17% 8% 25% 25% 18% 8%	519
	21st to end	Day	12% 8% 29% 30% 16% 6%	583
September	1st to 10th	Day	16% 9% 26% 22% 19% 8%	530
	11th to 20th	Day	17% 8% 24% 22% 18% 12%	530
	21st to end	Day	17% 11% 27% 24% 15% 6%	530
October	1st to 10th	Day	24% 14% 22% 21% 14% 5%	530
	11th to 20th	Day	23% 13% 28% 20% 13% 3	464
	21st to end	Day	31% 14% 26% 20% 8% 1	462
November	1st to 10th	Day	25% 17% 28% 19% 9% 2	425
	11th to 20th	Day	30% 18% 27% 17% 7% 1	430
	21st to end	Day	37% 16% 26% 16% 4 1	388
December	1st to 10th	Day	25% 22% 28% 20% 4	204
	11th to 20th	Day	35% 18% 31% 12% 5%	200
	21st to end	Day	31% 17% 27% 17% 6% 1	220
January	1st to 10th	Night	23% 20% 33% 23% 2	800
	11th to 20th	Night	28% 16% 29% 23% 4	800
	21st to end	Night	21% 20% 33% 22% 4	880
February	1st to 10th	Night	24% 16% 35% 23% 3	800
	11th to 20th	Night	23% 20% 34% 20% 3	783
	21st to end	Night	22% 17% 34% 22% 5%	660
March	1st to 10th	Night	28% 17% 31% 21% 3	800
	11th to 20th	Night	23% 19% 28% 23% 6%	800
	21st to end	Night	27% 16% 29% 22% 7%	880
April	1st to 10th	Night	28% 15% 28% 24% 5%	800
	11th to 20th	Night	26% 15% 30% 22% 6%	761
	21st to end	Night	26% 15% 28% 25% 7%	600
May	1st to 10th	Night	28% 10% 28% 27% 7%	600
	11th to 20th	Night	21% 12% 28% 29% 9%	497
	21st to end	Night	22% 6% 24% 37% 10% 1	433
June	1st to 10th	Night	21% 7% 26% 34% 10% 2	400
	11th to 20th	Night	21% 8% 26% 33% 12% 1	400
	21st to end	Night	20% 5% 26% 38% 11% 1	400
July	1st to 10th	Night	14% 4 27% 40% 15% 1	390
	11th to 20th	Night	13% 4 22% 39% 20% 2	388
	21st to end	Night	14% 4 23% 41% 16% 1	438
August	1st to 10th	Night	17% 4 19% 40% 18% 1	492
	11th to 20th	Night	17% 6% 24% 33% 18% 2	594
	21st to end	Night	15% 4 23% 33% 21% 4	880
September	1st to 10th	Night	15% 6% 28% 30% 19% 2	800
	11th to 20th	Night	16% 7% 23% 31% 19% 5%	800
	21st to end	Night	19% 8% 27% 25% 18% 3	800
October	1st to 10th	Night	23% 10% 21% 29% 15% 2	800
	11th to 20th	Night	19% 14% 30% 24% 12% 1	800
	21st to end	Night	28% 15% 26% 24% 8%	880
November	1st to 10th	Night	19% 16% 32% 24% 8% 1	820
	11th to 20th	Night	22% 20% 29% 21% 7% 1	840
	21st to end	Night	25% 18% 31% 21% 5%	840
December	1st to 10th	Night	26% 18% 32% 19% 5%	809
	11th to 20th	Night	27% 18% 30% 21% 4	800
	21st to end	Night	28% 19% 28% 23% 4	880

Page generated at 2025-11-30 01:00:52. Version ac07

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