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 2024-11-10.

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% 5% 5% 4 6% 7% 36%	101361
	Night	17% 8% 3 7% 5% 4 4 4 5% 6% 37%	97802
Transparency	Day	46% 5% 12% 22% 14% 2	104886
	Night	46% 6% 12% 22% 13% 2	102353
Seeing	Day	23% 14% 28% 21% 10% 3	14927
	Night	22% 13% 28% 26% 9% 1	23801

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	14% 8% 2 7% 5% 5% 4 4 5% 6% 41%	2517
	11th to 20th	Day	16% 8% 5% 9% 6% 4 4 3 6% 6% 33%	2520
	21st to end	Day	17% 10% 3 9% 4 5% 5% 4 5% 6% 32%	2772
February	1st to 10th	Day	16% 9% 3 7% 5% 6% 5% 4 5% 6% 34%	1696
	11th to 20th	Day	11% 9% 2 9% 6% 5% 5% 4 5% 7% 37%	1848
	21st to end	Day	15% 11% 3 8% 5% 5% 5% 4 6% 4 34%	1570
March	1st to 10th	Day	20% 15% 3 8% 5% 4 4 3 4 5% 29%	3116
	11th to 20th	Day	15% 9% 3 8% 4 5% 5% 4 6% 6% 34%	3316
	21st to end	Day	20% 9% 3 8% 5% 4 4 4 5% 7% 32%	4056
April	1st to 10th	Day	19% 10% 2 6% 5% 4 4 3 4 6% 36%	2280
	11th to 20th	Day	17% 6% 2 6% 6% 4 4 4 7% 7% 37%	2282
	21st to end	Day	21% 7% 3 7% 5% 5% 5% 3 5% 5% 34%	2470
May	1st to 10th	Day	22% 11% 4 8% 5% 5% 5% 4 5% 6% 26%	4106
	11th to 20th	Day	18% 8% 3 9% 5% 4 5% 4 6% 7% 32%	4264
	21st to end	Day	15% 4 2 5% 4 5% 5% 4 7% 9% 40%	4837
June	1st to 10th	Day	20% 6% 3 6% 5% 5% 5% 5% 6% 8% 31%	2660
	11th to 20th	Day	17% 5% 2 6% 6% 6% 4 4 5% 7% 38%	2660
	21st to end	Day	19% 7% 2 6% 5% 5% 6% 4 7% 7% 31%	2660
July	1st to 10th	Day	14% 6% 3 7% 5% 5% 5% 5% 6% 9% 35%	4440
	11th to 20th	Day	12% 5% 2 6% 5% 5% 5% 5% 8% 10% 38%	4440
	21st to end	Day	17% 6% 3 7% 5% 4 5% 4 6% 7% 37%	4814
August	1st to 10th	Day	15% 6% 2 7% 4 5% 5% 4 6% 8% 36%	4238
	11th to 20th	Day	15% 8% 3 7% 5% 4 5% 4 6% 9% 33%	4027
	21st to end	Day	8% 5% 2 6% 5% 5% 5% 4 7% 9% 45%	4180
September	1st to 10th	Day	12% 3 2 5% 4 5% 5% 4 6% 7% 47%	2280
	11th to 20th	Day	14% 5% 1 4 3 3 3 3 5% 6% 53%	2100
	21st to end	Day	16% 5% 2 6% 4 3 4 4 5% 7% 46%	2090
October	1st to 10th	Day	21% 8% 2 6% 4 4 4 4 4 5% 37%	2090
	11th to 20th	Day	15% 7% 2 5% 5% 4 4 4 5% 7% 42%	1819
	21st to end	Day	23% 8% 3 7% 4 3 4 3 5% 5% 35%	1881
November	1st to 10th	Day	15% 7% 2 5% 4 4 3 3 5% 7% 45%	1752
	11th to 20th	Day	19% 6% 2 5% 4 3 4 4 5% 7% 41%	1710
	21st to end	Day	21% 8% 2 5% 4 4 4 4 5% 6% 36%	1672
December	1st to 10th	Day	19% 10% 3 6% 4 5% 5% 4 6% 7% 30%	1520
	11th to 20th	Day	21% 8% 3 6% 4 4 4 3 4 5% 40%	1906
	21st to end	Day	24% 12% 3 6% 4 4 4 3 5% 5% 29%	2772
January	1st to 10th	Night	17% 7% 2 5% 4 5% 4 3 5% 6% 41%	4429
	11th to 20th	Night	13% 9% 3 10% 6% 5% 5% 4 7% 8% 30%	4440
	21st to end	Night	19% 12% 3 9% 5% 4 4 3 5% 5% 29%	4884
February	1st to 10th	Night	15% 9% 3 7% 5% 5% 5% 4 7% 7% 34%	2479
	11th to 20th	Night	11% 9% 3 7% 5% 4 5% 4 5% 7% 38%	2218
	21st to end	Night	14% 10% 3 6% 5% 5% 4 4 5% 7% 38%	1884
March	1st to 10th	Night	26% 11% 2 6% 4 4 4 3 5% 5% 31%	3724
	11th to 20th	Night	13% 10% 4 8% 6% 6% 6% 5% 6% 6% 33%	3641
	21st to end	Night	24% 9% 3 7% 4 3 4 4 5% 6% 32%	3572
April	1st to 10th	Night	20% 9% 3 6% 5% 4 4 4 4 5% 37%	1900
	11th to 20th	Night	19% 10% 2 6% 4 4 3 4 5% 6% 37%	1847
	21st to end	Night	21% 8% 3 6% 4 3 4 4 4 7% 36%	1710
May	1st to 10th	Night	26% 11% 3 7% 4 4 4 3 5% 7% 24%	2834
	11th to 20th	Night	17% 8% 3 9% 6% 6% 6% 4 7% 7% 26%	2658
	21st to end	Night	15% 6% 2 6% 5% 4 5% 3 5% 8% 40%	2738
June	1st to 10th	Night	20% 8% 2 7% 5% 5% 5% 3 6% 6% 34%	1520
	11th to 20th	Night	18% 6% 2 7% 5% 5% 5% 4 6% 7% 37%	1520
	21st to end	Night	19% 6% 1 6% 5% 4 5% 4 7% 8% 36%	1520
July	1st to 10th	Night	11% 5% 2 7% 5% 4 6% 5% 7% 9% 38%	2520
	11th to 20th	Night	13% 6% 2 6% 5% 5% 4 3 6% 8% 41%	2520
	21st to end	Night	14% 7% 2 6% 4 4 4 4 5% 7% 42%	2739
August	1st to 10th	Night	23% 8% 2 7% 4 4 3 3 5% 6% 35%	2660
	11th to 20th	Night	13% 7% 3 8% 5% 4 6% 4 6% 8% 36%	2797
	21st to end	Night	9% 4 2 5% 4 4 4 4 6% 8% 51%	3476
September	1st to 10th	Night	12% 5% 2 5% 3 4 3 3 4 6% 52%	1900
	11th to 20th	Night	14% 6% 1 4 3 3 3 3 5% 6% 52%	2080
	21st to end	Night	16% 6% 2 5% 4 3 3 3 5% 6% 46%	2090
October	1st to 10th	Night	20% 7% 2 7% 4 4 5% 3 4 6% 38%	2090
	11th to 20th	Night	16% 7% 2 6% 4 5% 5% 4 5% 6% 40%	2356
	21st to end	Night	22% 8% 2 7% 4 5% 4 3 5% 6% 35%	2717
November	1st to 10th	Night	14% 6% 2 6% 4 3 4 3 5% 7% 44%	2531
	11th to 20th	Night	16% 7% 2 6% 4 4 4 4 4 6% 42%	2470
	21st to end	Night	16% 7% 2 7% 5% 5% 4 4 5% 7% 38%	2506
December	1st to 10th	Night	20% 10% 4 7% 4 4 4 3 5% 6% 32%	2660
	11th to 20th	Night	20% 9% 3 6% 4 3 4 4 5% 6% 36%	3288
	21st to end	Night	23% 12% 3 7% 4 4 3 2 4 4 32%	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	43% 5% 11% 30% 11% 1	2518
	11th to 20th	Day	50% 5% 14% 21% 8% 2	2520
	21st to end	Day	51% 6% 11% 21% 10% 1	2772
February	1st to 10th	Day	49% 5% 12% 22% 10% 2	1696
	11th to 20th	Day	46% 6% 11% 21% 14% 3	1857
	21st to end	Day	50% 5% 10% 20% 13% 2	1570
March	1st to 10th	Day	59% 4 10% 14% 11% 3	3119
	11th to 20th	Day	45% 7% 13% 18% 14% 4	3316
	21st to end	Day	51% 3 7% 16% 19% 5%	4056
April	1st to 10th	Day	49% 4 8% 21% 15% 4	2280
	11th to 20th	Day	45% 6% 11% 20% 17% 2	2282
	21st to end	Day	51% 5% 8% 18% 15% 3	2470
May	1st to 10th	Day	57% 8% 9% 17% 8% 1	4120
	11th to 20th	Day	49% 7% 16% 16% 10% 2	4268
	21st to end	Day	37% 7% 13% 24% 16% 1	4837
June	1st to 10th	Day	49% 6% 12% 21% 11%	2660
	11th to 20th	Day	44% 5% 11% 21% 15% 3	2660
	21st to end	Day	50% 6% 11% 19% 12% 1	2660
July	1st to 10th	Day	43% 6% 12% 22% 16% 1	4370
	11th to 20th	Day	40% 6% 16% 26% 12%	4365
	21st to end	Day	46% 5% 12% 22% 14% 1	4661
August	1st to 10th	Day	45% 6% 15% 23% 11% 1	4224
	11th to 20th	Day	47% 5% 15% 25% 7% 1	4066
	21st to end	Day	35% 5% 14% 28% 17% 1	4180
September	1st to 10th	Day	35% 5% 12% 28% 18% 1	2280
	11th to 20th	Day	33% 4 9% 29% 23% 2	2100
	21st to end	Day	39% 4 10% 26% 19% 2	2090
October	1st to 10th	Day	47% 5% 7% 23% 16% 1	3480
	11th to 20th	Day	39% 4 11% 26% 15% 3	2996
	21st to end	Day	38% 3 8% 30% 17% 3	3081
November	1st to 10th	Day	39% 4 14% 26% 15% 2	1752
	11th to 20th	Day	42% 5% 11% 21% 19% 2	1710
	21st to end	Day	47% 5% 17% 19% 11% 1	1672
December	1st to 10th	Day	51% 7% 13% 17% 11% 1	1520
	11th to 20th	Day	48% 4 10% 18% 18% 2	1906
	21st to end	Day	56% 6% 10% 17% 11% 1	2772
January	1st to 10th	Night	42% 6% 14% 26% 10% 2	4429
	11th to 20th	Night	47% 8% 13% 20% 11% 2	4440
	21st to end	Night	56% 4 10% 18% 10% 1	4884
February	1st to 10th	Night	47% 6% 12% 20% 13% 2	2479
	11th to 20th	Night	44% 6% 10% 23% 15% 3	2220
	21st to end	Night	44% 4 12% 23% 12% 4	1884
March	1st to 10th	Night	55% 4 10% 17% 11% 2	3734
	11th to 20th	Night	49% 7% 11% 17% 14% 2	3642
	21st to end	Night	52% 3 7% 13% 19% 5%	3572
April	1st to 10th	Night	49% 5% 10% 18% 16% 3	1900
	11th to 20th	Night	48% 4 8% 21% 18% 1	1847
	21st to end	Night	47% 5% 10% 18% 16% 3	1710
May	1st to 10th	Night	58% 8% 10% 16% 8% 1	2840
	11th to 20th	Night	52% 9% 13% 15% 8% 2	2659
	21st to end	Night	41% 8% 15% 21% 13% 2	2739
June	1st to 10th	Night	49% 7% 11% 20% 12% 1	1520
	11th to 20th	Night	45% 7% 14% 19% 13% 2	1520
	21st to end	Night	45% 8% 13% 22% 11% 1	1520
July	1st to 10th	Night	39% 7% 16% 23% 13% 1	2480
	11th to 20th	Night	41% 6% 14% 25% 15%	2472
	21st to end	Night	41% 5% 12% 28% 13% 1	2651
August	1st to 10th	Night	52% 5% 12% 22% 9%	2650
	11th to 20th	Night	45% 7% 17% 19% 11%	2824
	21st to end	Night	30% 5% 18% 29% 17% 1	3476
September	1st to 10th	Night	34% 5% 13% 29% 19% 1	1900
	11th to 20th	Night	33% 5% 11% 28% 21% 2	2080
	21st to end	Night	38% 5% 11% 28% 17% 2	2090
October	1st to 10th	Night	44% 5% 12% 25% 12% 1	3480
	11th to 20th	Night	38% 5% 10% 25% 18% 3	3905
	21st to end	Night	40% 4 9% 30% 15% 2	4467
November	1st to 10th	Night	40% 5% 11% 26% 15% 2	2531
	11th to 20th	Night	42% 6% 11% 22% 17% 2	2470
	21st to end	Night	43% 7% 15% 24% 10% 1	2506
December	1st to 10th	Night	52% 5% 11% 22% 9%	2660
	11th to 20th	Night	48% 6% 12% 17% 16% 1	3288
	21st to end	Night	56% 4 8% 22% 9% 1	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	27% 19% 30% 21% 3 1	180
	11th to 20th	Day	31% 18% 30% 17% 2 2	180
	21st to end	Day	20% 21% 29% 21% 9% 1	198
February	1st to 10th	Day	29% 20% 31% 16% 4	308
	11th to 20th	Day	25% 27% 31% 14% 3	456
	21st to end	Day	29% 21% 30% 18% 3	382
March	1st to 10th	Day	29% 14% 35% 17% 5%	460
	11th to 20th	Day	26% 23% 30% 15% 5% 1	460
	21st to end	Day	27% 18% 29% 17% 6% 3	506
April	1st to 10th	Day	29% 20% 29% 13% 7% 2	460
	11th to 20th	Day	27% 18% 29% 17% 7% 2	452
	21st to end	Day	30% 18% 26% 16% 8% 2	460
May	1st to 10th	Day	29% 18% 23% 22% 6% 2	463
	11th to 20th	Day	22% 15% 31% 20% 10% 3	487
	21st to end	Day	21% 11% 29% 24% 11% 4	529
June	1st to 10th	Day	20% 11% 33% 23% 11% 3	490
	11th to 20th	Day	17% 14% 25% 28% 12% 3	490
	21st to end	Day	22% 9% 31% 22% 11% 4	490
July	1st to 10th	Day	19% 7% 29% 24% 16% 6%	485
	11th to 20th	Day	15% 5% 29% 31% 15% 4	484
	21st to end	Day	14% 6% 31% 30% 14% 4	532
August	1st to 10th	Day	13% 8% 26% 28% 19% 5%	486
	11th to 20th	Day	18% 8% 25% 24% 18% 7%	479
	21st to end	Day	12% 8% 27% 30% 16% 6%	539
September	1st to 10th	Day	16% 10% 26% 22% 19% 8%	490
	11th to 20th	Day	18% 9% 24% 21% 16% 12%	490
	21st to end	Day	17% 11% 27% 24% 15% 7%	490
October	1st to 10th	Day	25% 13% 22% 21% 13% 5%	490
	11th to 20th	Day	23% 13% 28% 20% 13% 3	430
	21st to end	Day	32% 14% 26% 20% 8% 1	429
November	1st to 10th	Day	23% 17% 28% 20% 10% 2	392
	11th to 20th	Day	30% 18% 28% 17% 7% 1	370
	21st to end	Day	34% 15% 27% 18% 4 1	332
December	1st to 10th	Day	24% 23% 28% 20% 4 1	180
	11th to 20th	Day	33% 18% 32% 13% 4	180
	21st to end	Day	33% 18% 27% 16% 5% 2	198
January	1st to 10th	Night	23% 19% 33% 24% 2	760
	11th to 20th	Night	28% 16% 29% 22% 4	760
	21st to end	Night	22% 20% 32% 23% 4	836
February	1st to 10th	Night	23% 15% 35% 24% 3	760
	11th to 20th	Night	22% 20% 35% 20% 3	743
	21st to end	Night	23% 18% 33% 21% 5%	628
March	1st to 10th	Night	27% 17% 31% 22% 3	760
	11th to 20th	Night	23% 19% 28% 23% 6%	760
	21st to end	Night	26% 16% 29% 22% 7%	836
April	1st to 10th	Night	27% 15% 28% 25% 5%	760
	11th to 20th	Night	26% 15% 30% 23% 7%	723
	21st to end	Night	26% 14% 27% 26% 7%	570
May	1st to 10th	Night	26% 11% 28% 28% 7%	570
	11th to 20th	Night	22% 12% 28% 28% 10%	472
	21st to end	Night	21% 6% 24% 37% 11% 1	411
June	1st to 10th	Night	21% 7% 26% 34% 10% 2	380
	11th to 20th	Night	21% 8% 25% 34% 12% 1	380
	21st to end	Night	20% 5% 26% 38% 11% 1	380
July	1st to 10th	Night	14% 4 26% 40% 16% 1	370
	11th to 20th	Night	13% 4 21% 39% 20% 2	368
	21st to end	Night	15% 4 22% 41% 17% 1	416
August	1st to 10th	Night	17% 4 18% 41% 19% 1	467
	11th to 20th	Night	18% 5% 24% 34% 17% 2	564
	21st to end	Night	16% 3 22% 33% 22% 4	836
September	1st to 10th	Night	14% 5% 28% 30% 19% 2	760
	11th to 20th	Night	16% 7% 23% 29% 19% 5%	760
	21st to end	Night	19% 8% 27% 25% 18% 3	760
October	1st to 10th	Night	24% 10% 20% 29% 15% 2	760
	11th to 20th	Night	19% 13% 30% 23% 13% 1	760
	21st to end	Night	28% 15% 26% 23% 8%	836
November	1st to 10th	Night	18% 16% 31% 25% 8% 1	779
	11th to 20th	Night	22% 20% 28% 22% 7% 1	760
	21st to end	Night	24% 18% 32% 20% 6%	760
December	1st to 10th	Night	26% 18% 32% 19% 4	760
	11th to 20th	Night	26% 19% 31% 21% 3	760
	21st to end	Night	28% 19% 28% 22% 3	836

Page generated at 2024-11-07 06:55:50. Version ac07

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