Lake City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake City clear sky chart from 2005-11-06 to 2024-11-08.

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	10% 6% 2 6% 5% 5% 5% 5% 7% 9% 40%	101000
	Night	10% 6% 2 6% 4 4 5% 4 6% 9% 43%	98040
Transparency	Day	39% 6% 15% 19% 15% 6%	104794
	Night	38% 5% 15% 19% 16% 7%	102385
Seeing	Day	11% 5% 17% 25% 24% 18%	15310
	Night	12% 3 18% 35% 26% 6%	25334

By Month

Percentage Cloud Cover SE (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% 8% 2 6% 4 3 4 3 4 7% 46%	2836
	11th to 20th	Day	16% 8% 3 6% 5% 5% 4 2 4 7% 39%	2840
	21st to end	Day	11% 6% 3 6% 4 4 5% 3 6% 7% 45%	3266
February	1st to 10th	Day	15% 8% 3 5% 4 3 3 3 5% 7% 44%	1900
	11th to 20th	Day	13% 6% 2 6% 3 4 4 4 5% 6% 47%	1848
	21st to end	Day	13% 7% 2 6% 4 3 3 3 5% 6% 48%	1572
March	1st to 10th	Day	14% 7% 3 6% 4 4 5% 5% 6% 9% 36%	3435
	11th to 20th	Day	8% 4 2 5% 4 5% 5% 4 6% 8% 50%	3480
	21st to end	Day	14% 4 2 4 4 3 4 4 5% 8% 47%	3815
April	1st to 10th	Day	8% 5% 2 6% 4 4 4 5% 6% 8% 47%	2090
	11th to 20th	Day	9% 5% 2 7% 5% 4 4 4 6% 7% 45%	2066
	21st to end	Day	5% 4 1 4 4 4 5% 4 7% 7% 54%	2422
May	1st to 10th	Day	7% 4 2 4 4 4 5% 4 6% 9% 51%	4082
	11th to 20th	Day	10% 6% 3 8% 5% 5% 5% 5% 7% 9% 37%	4081
	21st to end	Day	5% 4 2 4 5% 5% 5% 5% 7% 11% 48%	4476
June	1st to 10th	Day	11% 6% 3 8% 7% 6% 7% 5% 8% 10% 30%	2470
	11th to 20th	Day	5% 6% 2 7% 7% 7% 9% 7% 9% 11% 31%	2470
	21st to end	Day	8% 6% 2 7% 7% 7% 8% 6% 8% 11% 30%	2470
July	1st to 10th	Day	7% 6% 3 8% 7% 8% 9% 7% 11% 12% 23%	4120
	11th to 20th	Day	5% 4 2 7% 6% 6% 7% 7% 10% 15% 31%	4120
	21st to end	Day	5% 6% 3 8% 7% 8% 7% 7% 10% 14% 26%	4466
August	1st to 10th	Day	12% 5% 2 8% 6% 7% 7% 6% 8% 12% 26%	4104
	11th to 20th	Day	7% 5% 2 6% 6% 6% 7% 5% 8% 12% 35%	3823
	21st to end	Day	10% 6% 3 9% 6% 7% 5% 5% 8% 10% 30%	3926
September	1st to 10th	Day	10% 7% 4 9% 8% 8% 7% 5% 7% 11% 24%	2090
	11th to 20th	Day	11% 8% 3 9% 6% 7% 8% 5% 8% 9% 25%	2090
	21st to end	Day	9% 8% 3 7% 6% 5% 5% 5% 6% 7% 39%	2090
October	1st to 10th	Day	12% 7% 3 7% 4 5% 5% 4 6% 7% 41%	2090
	11th to 20th	Day	6% 4 2 5% 4 4 4 2 5% 7% 56%	1933
	21st to end	Day	8% 5% 2 5% 4 4 4 5% 5% 7% 52%	2090
November	1st to 10th	Day	9% 4 2 4 4 3 4 4 6% 7% 52%	1927
	11th to 20th	Day	9% 6% 3 5% 4 3 4 3 5% 6% 51%	1815
	21st to end	Day	11% 6% 2 4 4 4 5% 4 6% 6% 48%	1710
December	1st to 10th	Day	9% 6% 3 7% 5% 4 4 4 5% 8% 46%	1710
	11th to 20th	Day	15% 7% 2 7% 4 3 4 3 5% 6% 45%	2153
	21st to end	Day	17% 8% 3 7% 4 4 3 3 4 5% 41%	3124
January	1st to 10th	Night	14% 9% 3 5% 3 3 4 3 5% 7% 44%	4109
	11th to 20th	Night	11% 8% 3 8% 5% 4 5% 4 6% 7% 40%	4120
	21st to end	Night	14% 8% 2 7% 4 4 4 3 6% 7% 41%	4372
February	1st to 10th	Night	14% 6% 2 6% 4 3 4 3 4 6% 47%	2280
	11th to 20th	Night	13% 7% 2 5% 4 4 4 2 4 7% 48%	2218
	21st to end	Night	12% 8% 2 6% 4 3 4 2 4 6% 48%	1879
March	1st to 10th	Night	16% 9% 3 8% 5% 4 4 4 5% 7% 35%	3418
	11th to 20th	Night	9% 5% 2 5% 4 3 4 3 7% 10% 47%	3480
	21st to end	Night	13% 6% 2 5% 4 4 4 3 5% 7% 48%	3817
April	1st to 10th	Night	10% 5% 2 4 4 4 4 4 5% 8% 49%	2090
	11th to 20th	Night	8% 6% 2 6% 4 4 4 3 6% 7% 51%	2063
	21st to end	Night	5% 5% 1 5% 3 3 4 3 7% 6% 57%	1772
May	1st to 10th	Night	7% 6% 2 6% 4 4 4 4 5% 9% 50%	2813
	11th to 20th	Night	10% 6% 2 6% 4 4 4 4 6% 9% 43%	2812
	21st to end	Night	4 3 1 4 3 3 4 4 6% 10% 59%	3079
June	1st to 10th	Night	10% 6% 2 7% 6% 5% 6% 4 8% 11% 35%	1710
	11th to 20th	Night	5% 4 2 6% 5% 6% 7% 6% 10% 13% 37%	1710
	21st to end	Night	8% 5% 2 7% 5% 6% 7% 5% 8% 14% 35%	1710
July	1st to 10th	Night	9% 8% 4 10% 7% 7% 8% 6% 9% 10% 23%	2840
	11th to 20th	Night	3 5% 2 6% 5% 6% 6% 6% 10% 15% 35%	2840
	21st to end	Night	7% 7% 3 9% 6% 6% 7% 6% 11% 13% 26%	3087
August	1st to 10th	Night	12% 5% 2 7% 6% 6% 7% 5% 8% 12% 30%	2825
	11th to 20th	Night	5% 3 2 5% 4 4 6% 5% 9% 15% 43%	3000
	21st to end	Night	9% 7% 4 8% 5% 6% 6% 5% 7% 10% 34%	3695
September	1st to 10th	Night	9% 8% 3 9% 6% 6% 6% 5% 8% 10% 28%	2090
	11th to 20th	Night	11% 7% 3 7% 6% 6% 6% 6% 8% 11% 29%	2090
	21st to end	Night	9% 5% 3 7% 4 5% 5% 5% 6% 9% 42%	2090
October	1st to 10th	Night	10% 7% 3 7% 5% 4 4 3 5% 8% 45%	2090
	11th to 20th	Night	7% 3 1 5% 4 3 4 3 6% 6% 58%	2247
	21st to end	Night	7% 4 2 6% 5% 4 4 3 6% 6% 53%	2508
November	1st to 10th	Night	9% 4 2 5% 4 4 3 4 7% 7% 52%	2312
	11th to 20th	Night	10% 5% 2 6% 4 3 4 3 5% 6% 52%	2360
	21st to end	Night	11% 6% 2 6% 5% 4 3 4 6% 7% 47%	2470
December	1st to 10th	Night	11% 6% 3 6% 4 3 3 3 6% 8% 46%	2470
	11th to 20th	Night	14% 6% 2 5% 3 3 4 3 5% 6% 48%	3042
	21st to end	Night	16% 8% 3 6% 4 4 4 3 6% 6% 40%	4532

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	39% 2 6% 18% 21% 14%	2837
	11th to 20th	Day	47% 2 5% 15% 16% 14%	2840
	21st to end	Day	39% 2 10% 18% 18% 13%	3266
February	1st to 10th	Day	41% 2 10% 15% 20% 11%	1900
	11th to 20th	Day	39% 3 7% 16% 23% 13%	1858
	21st to end	Day	38% 3 8% 16% 21% 14%	1572
March	1st to 10th	Day	44% 3 10% 21% 15% 7%	3435
	11th to 20th	Day	32% 3 15% 17% 20% 13%	3480
	21st to end	Day	35% 2 9% 28% 16% 9%	3815
April	1st to 10th	Day	33% 4 12% 18% 19% 13%	2090
	11th to 20th	Day	37% 3 8% 22% 20% 9%	2066
	21st to end	Day	27% 4 10% 24% 25% 9%	2422
May	1st to 10th	Day	30% 4 14% 28% 19% 6%	4120
	11th to 20th	Day	43% 3 14% 23% 15% 2	4085
	21st to end	Day	29% 4 15% 31% 19% 2	4489
June	1st to 10th	Day	47% 6% 18% 18% 10% 1	2470
	11th to 20th	Day	43% 7% 21% 21% 7%	2470
	21st to end	Day	45% 9% 24% 16% 6% 1	2470
July	1st to 10th	Day	46% 14% 28% 11% 1	4055
	11th to 20th	Day	36% 13% 41% 9% 2	4051
	21st to end	Day	42% 15% 31% 11% 2	4324
August	1st to 10th	Day	45% 10% 28% 14% 3	4091
	11th to 20th	Day	37% 8% 25% 21% 8%	3862
	21st to end	Day	45% 9% 22% 21% 3	3926
September	1st to 10th	Day	52% 8% 19% 13% 6% 2	2090
	11th to 20th	Day	51% 9% 17% 15% 7% 1	2090
	21st to end	Day	42% 6% 11% 19% 17% 4	2090
October	1st to 10th	Day	50% 5% 7% 12% 17% 10%	3480
	11th to 20th	Day	19% 2 5% 17% 39% 18%	3186
	21st to end	Day	21% 3 7% 19% 40% 11%	3428
November	1st to 10th	Day	31% 3 10% 22% 20% 15%	1927
	11th to 20th	Day	34% 3 8% 19% 24% 11%	1815
	21st to end	Day	36% 3 9% 21% 24% 8%	1710
December	1st to 10th	Day	36% 3 13% 24% 18% 7%	1710
	11th to 20th	Day	41% 3 7% 20% 20% 9%	2150
	21st to end	Day	47% 3 5% 19% 19% 8%	3124
January	1st to 10th	Night	41% 2 7% 14% 20% 15%	4109
	11th to 20th	Night	44% 2 7% 16% 21% 11%	4120
	21st to end	Night	43% 3 11% 14% 18% 10%	4372
February	1st to 10th	Night	39% 3 8% 16% 19% 14%	2280
	11th to 20th	Night	38% 3 7% 19% 19% 14%	2219
	21st to end	Night	39% 3 8% 19% 19% 13%	1879
March	1st to 10th	Night	49% 3 11% 16% 12% 7%	3418
	11th to 20th	Night	32% 3 16% 20% 18% 11%	3480
	21st to end	Night	37% 2 10% 21% 20% 10%	3817
April	1st to 10th	Night	33% 4 13% 19% 19% 11%	2090
	11th to 20th	Night	34% 4 9% 23% 21% 10%	2063
	21st to end	Night	26% 3 13% 28% 21% 8%	1772
May	1st to 10th	Night	33% 4 17% 25% 15% 5%	2840
	11th to 20th	Night	38% 5% 19% 25% 11% 3	2813
	21st to end	Night	21% 5% 16% 34% 22% 2	3087
June	1st to 10th	Night	42% 6% 21% 22% 8% 1	1710
	11th to 20th	Night	34% 11% 26% 23% 6%	1710
	21st to end	Night	37% 11% 26% 19% 6% 1	1710
July	1st to 10th	Night	53% 13% 22% 10% 2	2795
	11th to 20th	Night	34% 14% 40% 10% 2	2786
	21st to end	Night	44% 14% 30% 10% 2	2988
August	1st to 10th	Night	43% 12% 31% 12% 2	2814
	11th to 20th	Night	27% 11% 30% 23% 8%	3027
	21st to end	Night	43% 10% 24% 19% 4	3695
September	1st to 10th	Night	47% 10% 22% 14% 5% 1	2090
	11th to 20th	Night	46% 10% 19% 17% 7% 1	2090
	21st to end	Night	37% 5% 18% 20% 16% 4	2090
October	1st to 10th	Night	49% 6% 10% 13% 12% 9%	3480
	11th to 20th	Night	20% 3 5% 22% 32% 18%	3733
	21st to end	Night	21% 3 7% 22% 34% 13%	4120
November	1st to 10th	Night	30% 4 9% 24% 19% 14%	2312
	11th to 20th	Night	34% 3 8% 19% 23% 13%	2360
	21st to end	Night	37% 4 9% 21% 20% 10%	2470
December	1st to 10th	Night	37% 2 13% 24% 16% 7%	2470
	11th to 20th	Night	38% 3 10% 17% 22% 9%	3044
	21st to end	Night	45% 3 9% 19% 19% 5%	4532

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	11% 12% 44% 22% 10% 1	270
	11th to 20th	Day	13% 9% 34% 28% 13% 3	270
	21st to end	Day	16% 13% 46% 20% 5%	297
February	1st to 10th	Day	17% 13% 34% 23% 10% 2	270
	11th to 20th	Day	19% 7% 38% 25% 10% 1	270
	21st to end	Day	10% 11% 38% 29% 11% 1	227
March	1st to 10th	Day	13% 8% 32% 30% 16% 1	460
	11th to 20th	Day	15% 5% 30% 32% 15% 3	460
	21st to end	Day	13% 7% 31% 27% 20% 2	506
April	1st to 10th	Day	10% 9% 29% 29% 19% 4	460
	11th to 20th	Day	11% 6% 29% 30% 18% 6%	452
	21st to end	Day	7% 4 21% 36% 22% 11%	460
May	1st to 10th	Day	7% 5% 17% 32% 25% 15%	463
	11th to 20th	Day	7% 2 15% 26% 30% 20%	487
	21st to end	Day	10% 1 8% 20% 33% 28%	529
June	1st to 10th	Day	13% 2 6% 22% 29% 28%	490
	11th to 20th	Day	7% 2 9% 18% 29% 35%	490
	21st to end	Day	7% 2 2 19% 31% 39%	490
July	1st to 10th	Day	7% 2 2 12% 29% 46%	485
	11th to 20th	Day	7% 1 1 12% 33% 47%	484
	21st to end	Day	10% 2 3 12% 32% 40%	532
August	1st to 10th	Day	13% 2 3 15% 28% 39%	486
	11th to 20th	Day	8% 1 3 12% 28% 48%	479
	21st to end	Day	11% 2 2 18% 33% 34%	539
September	1st to 10th	Day	12% 3 4 18% 30% 32%	490
	11th to 20th	Day	15% 2 5% 26% 32% 19%	490
	21st to end	Day	11% 3 5% 22% 37% 21%	490
October	1st to 10th	Day	15% 4 16% 32% 21% 11%	490
	11th to 20th	Day	7% 4 17% 30% 30% 11%	490
	21st to end	Day	10% 3 18% 39% 25% 5%	539
November	1st to 10th	Day	14% 4 19% 34% 22% 7%	483
	11th to 20th	Day	16% 4 26% 35% 15% 4	375
	21st to end	Day	11% 6% 31% 34% 16% 2	270
December	1st to 10th	Day	11% 8% 31% 26% 20% 5%	270
	11th to 20th	Day	18% 6% 31% 31% 13% 1	270
	21st to end	Day	16% 7% 28% 33% 12% 3	297
January	1st to 10th	Night	17% 6% 31% 36% 9% 1	760
	11th to 20th	Night	13% 8% 26% 38% 16% 1	760
	21st to end	Night	19% 7% 32% 34% 8%	836
February	1st to 10th	Night	17% 5% 29% 37% 11% 1	760
	11th to 20th	Night	16% 6% 31% 38% 8%	743
	21st to end	Night	15% 6% 29% 44% 6%	628
March	1st to 10th	Night	11% 6% 31% 40% 12%	760
	11th to 20th	Night	12% 6% 28% 38% 15% 1	760
	21st to end	Night	12% 5% 30% 39% 14% 1	836
April	1st to 10th	Night	12% 5% 29% 39% 15% 1	760
	11th to 20th	Night	11% 5% 28% 39% 17% 1	751
	21st to end	Night	7% 3 21% 43% 25% 1	622
May	1st to 10th	Night	6% 3 15% 48% 24% 2	570
	11th to 20th	Night	7% 2 14% 43% 29% 5%	561
	21st to end	Night	7% 2 7% 38% 40% 6%	617
June	1st to 10th	Night	10% 1 6% 34% 41% 7%	570
	11th to 20th	Night	5% 2 5% 29% 41% 17%	570
	21st to end	Night	8% 2 4 22% 47% 17%	570
July	1st to 10th	Night	8% 2 2 19% 49% 20%	555
	11th to 20th	Night	7% 1 1 12% 52% 27%	552
	21st to end	Night	6% 2 1 17% 54% 19%	624
August	1st to 10th	Night	10% 1 1 15% 55% 19%	567
	11th to 20th	Night	6% 2 1 13% 55% 23%	564
	21st to end	Night	12% 2 4 22% 43% 17%	755
September	1st to 10th	Night	13% 2 4 22% 46% 13%	760
	11th to 20th	Night	14% 2 5% 31% 39% 8%	760
	21st to end	Night	12% 1 8% 34% 39% 7%	760
October	1st to 10th	Night	14% 1 15% 39% 28% 3	760
	11th to 20th	Night	9% 2 17% 41% 29% 2	760
	21st to end	Night	8% 2 19% 43% 26% 2	836
November	1st to 10th	Night	11% 2 23% 41% 21% 1	771
	11th to 20th	Night	13% 3 22% 44% 17% 1	760
	21st to end	Night	14% 3 25% 43% 15% 1	760
December	1st to 10th	Night	15% 3 24% 37% 20% 2	760
	11th to 20th	Night	14% 4 26% 38% 17% 1	760
	21st to end	Night	16% 5% 25% 39% 15%	836

Page generated at 2024-11-05 08:15:47. Version ac07

Copyright © 2024 Attilla Danko.