Wonder Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wonder Lake State Park clear sky chart from 2005-11-06 to 2024-11-04.

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% 7% 3 6% 4 4 4 4 5% 7% 38%	101300
	Night	17% 8% 3 6% 4 4 4 3 5% 7% 39%	97721
Transparency	Day	43% 6% 11% 23% 15% 2	104832
	Night	43% 6% 11% 23% 15% 2	102278
Seeing	Day	24% 16% 29% 19% 9% 3	14962
	Night	23% 14% 28% 26% 8% 1	24032

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% 7% 2 7% 4 3 4 3 4 6% 45%	2517
	11th to 20th	Day	15% 10% 3 8% 7% 4 5% 3 4 5% 35%	2520
	21st to end	Day	21% 13% 5% 8% 4 4 3 3 4 5% 30%	2932
February	1st to 10th	Day	17% 8% 3 7% 5% 5% 5% 4 5% 7% 35%	1725
	11th to 20th	Day	14% 8% 2 6% 5% 5% 4 4 5% 7% 40%	1848
	21st to end	Day	19% 10% 3 7% 4 4 4 3 5% 5% 37%	1570
March	1st to 10th	Day	26% 10% 2 7% 4 3 3 2 3 4 34%	3116
	11th to 20th	Day	10% 6% 2 6% 5% 5% 5% 5% 6% 8% 42%	3283
	21st to end	Day	20% 8% 2 7% 4 4 4 2 5% 6% 38%	4165
April	1st to 10th	Day	18% 10% 3 6% 5% 3 5% 3 5% 5% 36%	2280
	11th to 20th	Day	17% 7% 3 6% 5% 4 4 4 5% 7% 39%	2254
	21st to end	Day	20% 6% 2 5% 5% 4 4 3 5% 6% 39%	2342
May	1st to 10th	Day	27% 9% 3 5% 4 3 3 3 5% 7% 30%	4106
	11th to 20th	Day	22% 8% 3 7% 5% 5% 5% 4 4 7% 32%	4365
	21st to end	Day	13% 6% 2 5% 4 4 4 4 6% 8% 44%	4837
June	1st to 10th	Day	17% 5% 2 5% 4 5% 5% 5% 8% 8% 36%	2660
	11th to 20th	Day	15% 7% 3 6% 5% 4 6% 4 7% 9% 36%	2660
	21st to end	Day	12% 7% 2 7% 5% 5% 6% 5% 6% 8% 38%	2660
July	1st to 10th	Day	11% 7% 3 7% 6% 6% 6% 4 6% 9% 35%	4440
	11th to 20th	Day	12% 7% 2 6% 4 5% 6% 4 7% 10% 38%	4440
	21st to end	Day	16% 7% 3 8% 5% 5% 5% 5% 5% 7% 34%	4814
August	1st to 10th	Day	20% 7% 3 6% 5% 5% 5% 4 6% 7% 31%	4258
	11th to 20th	Day	12% 8% 2 6% 4 4 5% 5% 6% 9% 41%	3730
	21st to end	Day	10% 6% 2 6% 4 4 4 4 6% 10% 45%	4180
September	1st to 10th	Day	13% 6% 2 6% 4 4 5% 4 5% 6% 43%	2280
	11th to 20th	Day	12% 5% 3 5% 4 3 4 3 4 7% 50%	2181
	21st to end	Day	16% 7% 2 7% 4 3 4 4 5% 7% 40%	2090
October	1st to 10th	Day	22% 7% 2 5% 4 4 4 3 4 4 41%	2006
	11th to 20th	Day	14% 6% 2 5% 4 4 4 3 6% 7% 45%	1900
	21st to end	Day	21% 6% 2 5% 5% 4 4 4 5% 6% 38%	1905
November	1st to 10th	Day	13% 7% 2 5% 3 4 3 2 4 6% 50%	1698
	11th to 20th	Day	18% 7% 3 5% 4 3 3 2 5% 7% 44%	1710
	21st to end	Day	17% 7% 2 6% 3 3 4 4 6% 6% 43%	1630
December	1st to 10th	Day	19% 8% 4 7% 4 5% 4 4 4 6% 35%	1520
	11th to 20th	Day	21% 7% 2 4 3 3 3 4 4 7% 42%	1906
	21st to end	Day	19% 11% 4 9% 5% 5% 4 4 5% 6% 30%	2772
January	1st to 10th	Night	16% 7% 2 5% 3 3 4 3 5% 7% 44%	4429
	11th to 20th	Night	15% 9% 3 8% 4 3 4 4 5% 5% 39%	4440
	21st to end	Night	23% 11% 3 7% 5% 4 3 2 4 5% 32%	4724
February	1st to 10th	Night	16% 10% 3 6% 5% 4 4 3 5% 5% 39%	2453
	11th to 20th	Night	15% 8% 3 6% 4 4 5% 4 6% 6% 38%	2218
	21st to end	Night	19% 7% 3 7% 4 3 4 3 5% 5% 40%	1884
March	1st to 10th	Night	24% 11% 3 6% 3 4 3 3 5% 5% 33%	3724
	11th to 20th	Night	11% 6% 2 7% 5% 5% 5% 4 5% 7% 43%	3672
	21st to end	Night	18% 10% 3 6% 4 3 3 3 4 5% 41%	3466
April	1st to 10th	Night	17% 9% 3 6% 5% 5% 5% 4 6% 6% 35%	1900
	11th to 20th	Night	18% 8% 3 6% 5% 5% 4 3 5% 7% 37%	1875
	21st to end	Night	20% 8% 2 6% 4 3 4 3 5% 5% 40%	1836
May	1st to 10th	Night	24% 9% 3 7% 5% 4 4 4 5% 8% 28%	2834
	11th to 20th	Night	22% 9% 4 7% 4 4 4 3 5% 5% 33%	2543
	21st to end	Night	15% 8% 2 6% 3 4 4 3 5% 8% 42%	2738
June	1st to 10th	Night	17% 6% 2 5% 5% 4 4 3 5% 7% 41%	1520
	11th to 20th	Night	14% 6% 2 6% 4 3 5% 5% 7% 8% 40%	1520
	21st to end	Night	12% 5% 2 6% 4 4 5% 3 7% 11% 41%	1520
July	1st to 10th	Night	11% 6% 2 6% 4 6% 5% 5% 7% 8% 38%	2520
	11th to 20th	Night	14% 6% 3 7% 5% 5% 4 5% 6% 9% 37%	2520
	21st to end	Night	17% 9% 2 6% 4 4 5% 4 5% 7% 36%	2739
August	1st to 10th	Night	22% 7% 3 7% 5% 5% 4 4 6% 7% 30%	2638
	11th to 20th	Night	15% 7% 3 6% 4 5% 4 4 5% 8% 40%	3097
	21st to end	Night	12% 6% 1 5% 3 3 3 3 5% 7% 53%	3476
September	1st to 10th	Night	15% 6% 2 6% 4 3 4 3 4 6% 46%	1900
	11th to 20th	Night	13% 5% 2 4 3 3 3 2 5% 7% 53%	1997
	21st to end	Night	17% 6% 3 6% 3 3 3 4 5% 5% 44%	2090
October	1st to 10th	Night	19% 8% 3 6% 3 4 3 3 4 6% 42%	2171
	11th to 20th	Night	15% 5% 2 6% 3 4 3 2 5% 7% 47%	2280
	21st to end	Night	21% 6% 3 6% 3 4 4 3 5% 6% 39%	2693
November	1st to 10th	Night	12% 6% 2 6% 4 3 4 3 5% 6% 48%	2453
	11th to 20th	Night	19% 7% 2 5% 4 3 3 3 4 7% 43%	2470
	21st to end	Night	14% 7% 2 5% 5% 4 4 3 6% 8% 43%	2549
December	1st to 10th	Night	19% 8% 2 7% 4 4 5% 3 5% 6% 38%	2660
	11th to 20th	Night	19% 8% 2 5% 4 4 5% 4 5% 6% 37%	3288
	21st to end	Night	21% 11% 3 7% 4 4 4 3 5% 6% 33%	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	41% 4 10% 33% 9% 2	2518
	11th to 20th	Day	50% 6% 9% 24% 10% 1	2520
	21st to end	Day	56% 4 8% 21% 10% 1	2932
February	1st to 10th	Day	48% 6% 11% 20% 13% 1	1725
	11th to 20th	Day	43% 6% 10% 23% 16% 2	1857
	21st to end	Day	49% 4 11% 21% 12% 3	1570
March	1st to 10th	Day	55% 4 10% 19% 11% 2	3119
	11th to 20th	Day	36% 8% 11% 31% 12% 1	3283
	21st to end	Day	47% 4 7% 16% 21% 5%	4165
April	1st to 10th	Day	48% 6% 8% 21% 14% 3	2280
	11th to 20th	Day	44% 5% 10% 22% 16% 3	2254
	21st to end	Day	44% 6% 10% 21% 16% 3	2342
May	1st to 10th	Day	53% 6% 13% 15% 11% 1	4120
	11th to 20th	Day	52% 6% 12% 20% 9% 1	4369
	21st to end	Day	36% 7% 12% 27% 17% 1	4837
June	1st to 10th	Day	43% 8% 13% 23% 13% 1	2660
	11th to 20th	Day	43% 7% 14% 24% 11% 2	2660
	21st to end	Day	42% 8% 12% 25% 13% 1	2660
July	1st to 10th	Day	43% 9% 11% 21% 15% 1	4370
	11th to 20th	Day	39% 7% 16% 23% 13% 1	4365
	21st to end	Day	48% 7% 11% 18% 15% 1	4661
August	1st to 10th	Day	49% 7% 14% 21% 8%	4244
	11th to 20th	Day	38% 7% 16% 30% 10%	3766
	21st to end	Day	34% 6% 12% 32% 16% 1	4180
September	1st to 10th	Day	40% 6% 11% 24% 18% 1	2280
	11th to 20th	Day	35% 4 9% 25% 25% 2	2181
	21st to end	Day	43% 5% 10% 22% 16% 3	2090
October	1st to 10th	Day	40% 6% 9% 18% 24% 4	3331
	11th to 20th	Day	29% 4 9% 26% 27% 5%	3140
	21st to end	Day	31% 4 15% 25% 22% 4	3117
November	1st to 10th	Day	36% 4 12% 27% 18% 3	1698
	11th to 20th	Day	40% 4 11% 23% 18% 3	1710
	21st to end	Day	41% 4 14% 28% 12% 2	1630
December	1st to 10th	Day	50% 5% 13% 18% 14% 1	1520
	11th to 20th	Day	42% 5% 15% 21% 13% 2	1906
	21st to end	Day	54% 6% 10% 21% 9%	2772
January	1st to 10th	Night	40% 5% 11% 29% 11% 3	4429
	11th to 20th	Night	45% 5% 13% 23% 11% 3	4440
	21st to end	Night	55% 4 8% 21% 11% 2	4724
February	1st to 10th	Night	46% 5% 12% 23% 12% 2	2453
	11th to 20th	Night	44% 5% 10% 18% 19% 4	2220
	21st to end	Night	45% 4 8% 23% 15% 4	1884
March	1st to 10th	Night	52% 6% 9% 19% 12% 2	3734
	11th to 20th	Night	37% 7% 14% 24% 15% 2	3673
	21st to end	Night	45% 4 7% 14% 24% 6%	3466
April	1st to 10th	Night	47% 6% 10% 20% 15% 3	1900
	11th to 20th	Night	47% 6% 10% 19% 18% 1	1875
	21st to end	Night	45% 5% 8% 22% 16% 4	1836
May	1st to 10th	Night	55% 8% 10% 16% 10% 1	2840
	11th to 20th	Night	52% 6% 12% 18% 10% 1	2544
	21st to end	Night	39% 7% 14% 25% 12% 3	2739
June	1st to 10th	Night	42% 7% 9% 24% 16% 2	1520
	11th to 20th	Night	39% 6% 19% 25% 10% 1	1520
	21st to end	Night	36% 8% 15% 26% 14% 1	1520
July	1st to 10th	Night	40% 10% 15% 19% 15% 1	2480
	11th to 20th	Night	42% 8% 14% 24% 12%	2472
	21st to end	Night	45% 7% 14% 15% 18% 2	2651
August	1st to 10th	Night	52% 8% 14% 18% 8% 1	2628
	11th to 20th	Night	42% 6% 14% 29% 8%	3127
	21st to end	Night	30% 5% 12% 36% 15% 1	3476
September	1st to 10th	Night	40% 5% 10% 28% 17% 1	1900
	11th to 20th	Night	31% 4 11% 26% 26% 2	1997
	21st to end	Night	42% 5% 8% 22% 22% 2	2090
October	1st to 10th	Night	41% 5% 11% 22% 20% 2	3626
	11th to 20th	Night	27% 4 10% 29% 26% 4	3779
	21st to end	Night	34% 4 13% 29% 17% 2	4431
November	1st to 10th	Night	37% 5% 11% 23% 21% 4	2453
	11th to 20th	Night	42% 3 10% 23% 19% 4	2470
	21st to end	Night	39% 5% 13% 30% 12% 1	2549
December	1st to 10th	Night	47% 6% 11% 22% 14% 1	2660
	11th to 20th	Night	45% 6% 13% 19% 15% 2	3288
	21st to end	Night	51% 6% 11% 21% 11%	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	35% 22% 24% 16% 3	180
	11th to 20th	Day	38% 22% 26% 12% 2	180
	21st to end	Day	23% 30% 32% 10% 4 1	243
February	1st to 10th	Day	36% 27% 27% 8% 2	285
	11th to 20th	Day	31% 26% 31% 11% 1	456
	21st to end	Day	35% 21% 29% 12% 3	382
March	1st to 10th	Day	31% 20% 32% 14% 3	460
	11th to 20th	Day	31% 25% 28% 13% 3 1	460
	21st to end	Day	34% 21% 30% 10% 4 2	506
April	1st to 10th	Day	34% 22% 25% 11% 6% 1	460
	11th to 20th	Day	29% 24% 27% 12% 7% 2	452
	21st to end	Day	32% 15% 34% 14% 3 2	460
May	1st to 10th	Day	37% 17% 26% 13% 5% 2	463
	11th to 20th	Day	25% 16% 31% 20% 7% 1	487
	21st to end	Day	20% 12% 28% 27% 11% 3	529
June	1st to 10th	Day	21% 11% 32% 23% 11% 1	490
	11th to 20th	Day	17% 13% 32% 23% 13% 2	490
	21st to end	Day	16% 13% 31% 24% 14% 2	490
July	1st to 10th	Day	17% 7% 30% 28% 14% 4	485
	11th to 20th	Day	13% 6% 31% 31% 15% 3	484
	21st to end	Day	14% 9% 34% 28% 13% 2	532
August	1st to 10th	Day	17% 7% 26% 29% 15% 5%	486
	11th to 20th	Day	15% 7% 27% 29% 15% 6%	479
	21st to end	Day	12% 11% 29% 27% 14% 7%	539
September	1st to 10th	Day	19% 13% 23% 21% 17% 7%	490
	11th to 20th	Day	14% 9% 29% 26% 14% 9%	490
	21st to end	Day	23% 12% 29% 20% 10% 5%	490
October	1st to 10th	Day	29% 12% 24% 17% 14% 4	490
	11th to 20th	Day	19% 20% 29% 21% 9% 2	490
	21st to end	Day	29% 12% 28% 20% 9% 1	442
November	1st to 10th	Day	21% 17% 25% 23% 11% 2	374
	11th to 20th	Day	29% 22% 27% 15% 6% 1	370
	21st to end	Day	24% 22% 28% 19% 6% 1	290
December	1st to 10th	Day	28% 27% 29% 12% 3 1	180
	11th to 20th	Day	39% 22% 28% 9% 2	180
	21st to end	Day	30% 25% 27% 13% 6%	198
January	1st to 10th	Night	23% 19% 36% 19% 3	760
	11th to 20th	Night	28% 20% 28% 21% 3	760
	21st to end	Night	23% 22% 31% 20% 3	836
February	1st to 10th	Night	26% 19% 32% 22% 2	760
	11th to 20th	Night	25% 22% 36% 16% 1	743
	21st to end	Night	30% 20% 30% 18% 3	628
March	1st to 10th	Night	27% 20% 31% 18% 4	760
	11th to 20th	Night	25% 23% 30% 19% 3	760
	21st to end	Night	25% 21% 31% 19% 4	836
April	1st to 10th	Night	27% 20% 31% 18% 4	760
	11th to 20th	Night	25% 17% 31% 22% 5%	751
	21st to end	Night	26% 18% 31% 19% 6%	696
May	1st to 10th	Night	27% 15% 31% 22% 5% 1	570
	11th to 20th	Night	25% 13% 32% 24% 6%	409
	21st to end	Night	19% 6% 27% 36% 11% 1	411
June	1st to 10th	Night	19% 7% 28% 33% 12%	380
	11th to 20th	Night	18% 7% 25% 34% 14% 1	380
	21st to end	Night	14% 5% 25% 44% 12% 1	380
July	1st to 10th	Night	16% 5% 20% 38% 21% 1	370
	11th to 20th	Night	14% 4 22% 43% 16% 1	368
	21st to end	Night	14% 4 24% 41% 17%	416
August	1st to 10th	Night	12% 3 27% 40% 16% 2	445
	11th to 20th	Night	15% 5% 19% 38% 21% 2	750
	21st to end	Night	18% 4 19% 36% 21% 2	836
September	1st to 10th	Night	17% 6% 26% 33% 14% 3	760
	11th to 20th	Night	16% 7% 24% 30% 18% 4	760
	21st to end	Night	21% 7% 26% 29% 15% 2	760
October	1st to 10th	Night	25% 10% 23% 27% 14% 2	760
	11th to 20th	Night	18% 13% 30% 27% 10% 1	760
	21st to end	Night	26% 14% 26% 26% 8%	836
November	1st to 10th	Night	18% 15% 29% 27% 10% 1	755
	11th to 20th	Night	23% 18% 28% 22% 7% 1	760
	21st to end	Night	23% 17% 28% 25% 7% 1	760
December	1st to 10th	Night	27% 18% 29% 20% 5%	760
	11th to 20th	Night	26% 19% 29% 22% 4	760
	21st to end	Night	28% 18% 31% 22% 2	836

Page generated at 2024-11-01 22:47:53. Version ac07

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