Sturgeon Point State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sturgeon Point State Park clear sky chart from 2005-11-06 to 2024-12-09.

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	13% 9% 3 8% 5% 5% 5% 4 6% 7% 34%	101587
	Night	14% 10% 4 8% 5% 5% 5% 4 6% 7% 33%	98266
Transparency	Day	46% 5% 13% 22% 11% 1	105122
	Night	49% 4 13% 22% 10% 1	102819
Seeing	Day	17% 8% 28% 30% 14% 4	15528
	Night	19% 8% 29% 29% 13% 2	25010

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	17% 13% 6% 12% 6% 5% 5% 4 6% 5% 21%	2472
	11th to 20th	Day	13% 15% 6% 13% 9% 7% 6% 5% 6% 6% 14%	2530
	21st to end	Day	18% 19% 6% 10% 6% 5% 6% 4 5% 6% 15%	2880
February	1st to 10th	Day	12% 13% 4 12% 6% 7% 6% 6% 6% 6% 22%	1710
	11th to 20th	Day	11% 13% 4 11% 7% 6% 6% 4 7% 6% 26%	1739
	21st to end	Day	12% 11% 3 12% 8% 6% 7% 4 6% 7% 24%	1570
March	1st to 10th	Day	14% 12% 4 9% 5% 5% 5% 3 5% 6% 31%	3176
	11th to 20th	Day	11% 11% 5% 10% 7% 6% 5% 4 7% 7% 28%	3480
	21st to end	Day	16% 9% 3 11% 7% 6% 6% 4 6% 7% 27%	3815
April	1st to 10th	Day	16% 12% 4 9% 5% 5% 6% 4 5% 5% 30%	2228
	11th to 20th	Day	17% 9% 3 7% 4 4 4 4 5% 6% 36%	2442
	21st to end	Day	15% 9% 3 8% 5% 4 4 4 6% 6% 37%	2470
May	1st to 10th	Day	13% 9% 3 8% 5% 5% 5% 4 5% 7% 37%	4108
	11th to 20th	Day	13% 6% 3 7% 4 4 5% 5% 6% 8% 40%	4081
	21st to end	Day	10% 5% 2 5% 4 4 4 4 6% 7% 47%	4954
June	1st to 10th	Day	11% 7% 2 6% 5% 4 5% 4 7% 8% 41%	2850
	11th to 20th	Day	10% 5% 2 6% 4 5% 5% 4 7% 8% 43%	2850
	21st to end	Day	11% 7% 2 6% 4 4 4 4 7% 8% 41%	2850
July	1st to 10th	Day	11% 6% 2 6% 5% 6% 6% 4 7% 8% 39%	4675
	11th to 20th	Day	7% 5% 2 6% 5% 5% 5% 5% 7% 9% 45%	4440
	21st to end	Day	8% 4 2 5% 4 4 5% 4 7% 10% 47%	4725
August	1st to 10th	Day	9% 4 2 6% 4 5% 5% 5% 8% 9% 44%	4104
	11th to 20th	Day	11% 5% 2 5% 4 4 5% 5% 7% 9% 43%	4044
	21st to end	Day	11% 5% 2 7% 5% 5% 5% 4 6% 9% 40%	4532
September	1st to 10th	Day	10% 6% 2 7% 4 4 5% 4 7% 9% 41%	2192
	11th to 20th	Day	11% 5% 2 5% 3 3 5% 4 6% 9% 46%	2090
	21st to end	Day	15% 7% 3 7% 5% 4 5% 5% 5% 9% 35%	2090
October	1st to 10th	Day	15% 7% 2 8% 5% 4 4 3 5% 7% 39%	2014
	11th to 20th	Day	20% 10% 4 7% 6% 5% 5% 4 6% 7% 28%	1900
	21st to end	Day	20% 11% 4 9% 7% 5% 6% 4 8% 6% 21%	1894
November	1st to 10th	Day	13% 12% 3 8% 6% 5% 5% 5% 6% 8% 29%	1762
	11th to 20th	Day	13% 13% 5% 9% 5% 6% 6% 4 6% 7% 25%	1712
	21st to end	Day	20% 13% 5% 9% 6% 6% 4 4 6% 7% 21%	1600
December	1st to 10th	Day	13% 14% 6% 11% 6% 5% 6% 5% 6% 7% 20%	1506
	11th to 20th	Day	16% 14% 5% 9% 6% 6% 4 4 6% 8% 22%	1671
	21st to end	Day	25% 24% 8% 12% 4 5% 5% 3 3 4 8%	2431
January	1st to 10th	Night	17% 13% 5% 12% 6% 5% 5% 4 6% 6% 22%	4478
	11th to 20th	Night	13% 14% 6% 14% 8% 7% 7% 4 5% 5% 15%	4440
	21st to end	Night	15% 17% 6% 14% 7% 6% 5% 4 6% 5% 15%	4782
February	1st to 10th	Night	10% 15% 5% 12% 7% 5% 5% 5% 6% 6% 24%	2470
	11th to 20th	Night	12% 13% 4 8% 6% 5% 5% 4 5% 8% 28%	2327
	21st to end	Night	15% 15% 5% 9% 6% 5% 4 4 5% 6% 24%	1884
March	1st to 10th	Night	13% 10% 3 8% 4 4 4 3 5% 6% 41%	3664
	11th to 20th	Night	8% 10% 3 7% 5% 4 4 4 6% 7% 39%	3479
	21st to end	Night	13% 10% 3 8% 5% 5% 4 4 5% 6% 35%	3817
April	1st to 10th	Night	18% 10% 2 7% 4 5% 4 4 5% 6% 35%	1966
	11th to 20th	Night	17% 9% 3 8% 4 3 3 3 5% 7% 38%	1687
	21st to end	Night	17% 9% 3 8% 6% 4 4 3 5% 6% 35%	1710
May	1st to 10th	Night	12% 9% 3 8% 6% 5% 5% 5% 6% 7% 35%	2833
	11th to 20th	Night	12% 6% 3 8% 5% 3 4 4 7% 8% 39%	2812
	21st to end	Night	11% 6% 2 6% 4 4 4 4 5% 7% 46%	2610
June	1st to 10th	Night	12% 6% 2 5% 5% 4 5% 4 6% 8% 43%	1330
	11th to 20th	Night	10% 4 2 6% 4 4 4 4 7% 10% 45%	1330
	21st to end	Night	8% 7% 4 7% 4 5% 5% 3 5% 7% 45%	1330
July	1st to 10th	Night	8% 5% 3 7% 5% 3 4 4 7% 8% 45%	2291
	11th to 20th	Night	8% 4 2 4 4 4 5% 4 6% 8% 51%	2530
	21st to end	Night	7% 4 1 6% 4 4 5% 4 6% 9% 50%	2833
August	1st to 10th	Night	8% 5% 2 6% 4 4 3 3 6% 9% 49%	2825
	11th to 20th	Night	12% 5% 1 4 3 2 4 4 6% 9% 50%	2785
	21st to end	Night	7% 6% 3 5% 4 5% 4 4 6% 8% 48%	3124
September	1st to 10th	Night	9% 4 2 6% 4 4 5% 5% 6% 8% 46%	1965
	11th to 20th	Night	9% 4 2 5% 3 4 5% 4 6% 8% 51%	2090
	21st to end	Night	15% 6% 3 7% 4 4 4 4 5% 8% 39%	2090
October	1st to 10th	Night	15% 6% 3 6% 4 5% 4 4 6% 7% 40%	2166
	11th to 20th	Night	18% 11% 3 6% 4 4 5% 4 5% 6% 33%	2280
	21st to end	Night	21% 12% 3 7% 4 4 5% 4 5% 6% 28%	2703
November	1st to 10th	Night	12% 10% 4 8% 5% 4 4 3 6% 8% 35%	2536
	11th to 20th	Night	14% 12% 3 10% 7% 5% 6% 4 6% 7% 26%	2685
	21st to end	Night	18% 14% 4 8% 5% 5% 6% 4 6% 8% 22%	2800
December	1st to 10th	Night	16% 14% 5% 9% 5% 5% 5% 4 7% 7% 24%	2852
	11th to 20th	Night	14% 14% 5% 10% 7% 6% 6% 5% 7% 8% 18%	3526
	21st to end	Night	25% 23% 8% 11% 6% 5% 4 2 3 4 10%	5236

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	65% 3 17% 13% 2	2473
	11th to 20th	Day	70% 4 14% 11% 1	2530
	21st to end	Day	68% 5% 15% 9% 3	2880
February	1st to 10th	Day	61% 5% 10% 19% 5%	1710
	11th to 20th	Day	56% 6% 13% 15% 10% 1	1748
	21st to end	Day	58% 5% 12% 17% 7% 1	1570
March	1st to 10th	Day	53% 4 13% 22% 7% 1	3179
	11th to 20th	Day	52% 6% 12% 20% 7% 2	3480
	21st to end	Day	54% 7% 11% 16% 12%	3815
April	1st to 10th	Day	54% 5% 9% 20% 11% 1	2228
	11th to 20th	Day	46% 5% 11% 20% 16% 1	2442
	21st to end	Day	46% 5% 14% 18% 14% 3	2470
May	1st to 10th	Day	45% 4 10% 20% 19% 2	4120
	11th to 20th	Day	40% 4 15% 27% 13% 1	4085
	21st to end	Day	35% 5% 13% 21% 21% 6%	4954
June	1st to 10th	Day	38% 6% 12% 28% 14% 2	2850
	11th to 20th	Day	37% 5% 11% 27% 18% 2	2850
	21st to end	Day	39% 5% 14% 27% 14% 2	2850
July	1st to 10th	Day	40% 7% 14% 22% 16% 2	4603
	11th to 20th	Day	31% 7% 15% 34% 12% 1	4365
	21st to end	Day	31% 7% 15% 25% 21% 1	4575
August	1st to 10th	Day	34% 7% 14% 32% 13% 1	4091
	11th to 20th	Day	36% 6% 17% 28% 12% 1	4083
	21st to end	Day	37% 7% 15% 30% 10% 1	4531
September	1st to 10th	Day	36% 7% 13% 30% 13% 1	2192
	11th to 20th	Day	34% 6% 16% 31% 12% 1	2090
	21st to end	Day	45% 6% 15% 26% 9%	2090
October	1st to 10th	Day	34% 5% 12% 34% 14% 1	3352
	11th to 20th	Day	50% 5% 10% 23% 12%	3140
	21st to end	Day	55% 5% 12% 20% 7%	3094
November	1st to 10th	Day	52% 6% 11% 22% 9%	1762
	11th to 20th	Day	57% 4 17% 14% 8%	1712
	21st to end	Day	65% 5% 13% 14% 3	1600
December	1st to 10th	Day	64% 5% 16% 13% 3	1506
	11th to 20th	Day	61% 5% 15% 16% 3 1	1671
	21st to end	Day	83% 3 7% 6% 1	2431
January	1st to 10th	Night	63% 3 13% 17% 3	4478
	11th to 20th	Night	70% 5% 11% 12% 2	4440
	21st to end	Night	72% 4 10% 11% 3	4782
February	1st to 10th	Night	60% 3 12% 17% 8% 1	2470
	11th to 20th	Night	53% 4 12% 22% 7%	2329
	21st to end	Night	61% 2 12% 16% 8%	1884
March	1st to 10th	Night	46% 3 18% 24% 9% 1	3674
	11th to 20th	Night	43% 4 16% 26% 10% 1	3480
	21st to end	Night	47% 4 12% 25% 11% 1	3817
April	1st to 10th	Night	50% 5% 8% 20% 14% 1	1966
	11th to 20th	Night	45% 5% 8% 23% 17% 3	1687
	21st to end	Night	48% 4 9% 19% 17% 4	1710
May	1st to 10th	Night	46% 6% 10% 18% 18% 2	2840
	11th to 20th	Night	41% 4 9% 27% 16% 2	2813
	21st to end	Night	39% 4 11% 22% 19% 6%	2611
June	1st to 10th	Night	39% 4 11% 26% 18% 2	1330
	11th to 20th	Night	33% 5% 14% 26% 20% 2	1330
	21st to end	Night	38% 5% 13% 24% 17% 3	1330
July	1st to 10th	Night	35% 4 16% 24% 17% 4	2254
	11th to 20th	Night	29% 6% 12% 37% 14% 1	2482
	21st to end	Night	31% 6% 16% 24% 22% 1	2743
August	1st to 10th	Night	32% 5% 15% 30% 17% 1	2814
	11th to 20th	Night	31% 5% 17% 31% 13% 2	2812
	21st to end	Night	33% 5% 14% 35% 11% 1	3124
September	1st to 10th	Night	34% 7% 13% 28% 17% 1	1965
	11th to 20th	Night	32% 4 16% 35% 13%	2090
	21st to end	Night	43% 5% 15% 26% 11%	2090
October	1st to 10th	Night	32% 4 13% 34% 17% 1	3608
	11th to 20th	Night	47% 3 11% 25% 13%	3779
	21st to end	Night	49% 4 15% 26% 7%	4453
November	1st to 10th	Night	47% 4 14% 25% 8% 1	2536
	11th to 20th	Night	57% 5% 15% 17% 6%	2685
	21st to end	Night	62% 4 16% 14% 3	2800
December	1st to 10th	Night	59% 5% 17% 15% 4	2852
	11th to 20th	Night	64% 5% 14% 13% 3	3525
	21st to end	Night	81% 3 7% 7% 2	5236

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	23% 12% 29% 27% 9% 1	256
	11th to 20th	Day	20% 9% 39% 26% 6% 1	270
	21st to end	Day	26% 10% 26% 31% 7%	297
February	1st to 10th	Day	23% 14% 40% 19% 5%	270
	11th to 20th	Day	17% 17% 41% 21% 3	270
	21st to end	Day	18% 19% 42% 20% 2	225
March	1st to 10th	Day	22% 11% 38% 20% 7% 2	303
	11th to 20th	Day	20% 12% 33% 25% 9% 1	460
	21st to end	Day	25% 10% 31% 26% 8% 1	506
April	1st to 10th	Day	21% 14% 32% 24% 7% 2	460
	11th to 20th	Day	21% 13% 30% 22% 10% 4	452
	21st to end	Day	21% 9% 32% 27% 10% 2	460
May	1st to 10th	Day	19% 9% 32% 27% 11% 3	463
	11th to 20th	Day	15% 7% 29% 32% 13% 5%	487
	21st to end	Day	12% 6% 25% 36% 17% 5%	657
June	1st to 10th	Day	13% 4 28% 37% 15% 3	680
	11th to 20th	Day	15% 5% 25% 33% 20% 3	680
	21st to end	Day	14% 4 22% 37% 19% 4	680
July	1st to 10th	Day	9% 2 20% 39% 26% 5%	671
	11th to 20th	Day	9% 3 22% 39% 21% 6%	668
	21st to end	Day	11% 4 23% 33% 21% 8%	687
August	1st to 10th	Day	12% 3 20% 34% 23% 9%	486
	11th to 20th	Day	7% 3 19% 36% 28% 7%	479
	21st to end	Day	11% 5% 22% 35% 23% 4	539
September	1st to 10th	Day	12% 7% 23% 32% 18% 8%	490
	11th to 20th	Day	11% 6% 20% 29% 21% 12%	490
	21st to end	Day	18% 5% 24% 28% 17% 8%	490
October	1st to 10th	Day	22% 8% 27% 25% 16% 3	490
	11th to 20th	Day	23% 11% 31% 27% 8% 1	490
	21st to end	Day	26% 10% 34% 23% 7%	343
November	1st to 10th	Day	18% 11% 34% 26% 10% 1	300
	11th to 20th	Day	24% 13% 36% 18% 8% 1	255
	21st to end	Day	25% 14% 36% 22% 4	200
December	1st to 10th	Day	20% 11% 36% 23% 8% 2	196
	11th to 20th	Day	27% 15% 40% 14% 4	180
	21st to end	Day	26% 15% 36% 19% 5%	198
January	1st to 10th	Night	20% 11% 34% 28% 6% 1	950
	11th to 20th	Night	23% 13% 33% 23% 8%	950
	21st to end	Night	17% 9% 34% 32% 7% 2	982
February	1st to 10th	Night	18% 10% 40% 26% 6%	760
	11th to 20th	Night	19% 11% 37% 25% 8%	743
	21st to end	Night	25% 11% 35% 25% 5%	628
March	1st to 10th	Night	17% 11% 35% 27% 9% 1	760
	11th to 20th	Night	17% 11% 34% 28% 9% 1	760
	21st to end	Night	21% 9% 29% 28% 11% 1	836
April	1st to 10th	Night	23% 10% 33% 26% 7% 1	637
	11th to 20th	Night	21% 9% 26% 31% 12% 2	563
	21st to end	Night	22% 7% 28% 30% 12% 1	570
May	1st to 10th	Night	16% 5% 29% 33% 14% 4	570
	11th to 20th	Night	17% 3 21% 39% 18% 2	561
	21st to end	Night	14% 3 22% 32% 26% 3	472
June	1st to 10th	Night	15% 2 22% 40% 19% 2	380
	11th to 20th	Night	13% 3 22% 32% 27% 3	380
	21st to end	Night	11% 3 16% 42% 24% 4	380
July	1st to 10th	Night	6% 1 13% 44% 32% 4	410
	11th to 20th	Night	9% 2 14% 39% 28% 7%	552
	21st to end	Night	10% 2 16% 39% 29% 4	624
August	1st to 10th	Night	9% 3 15% 38% 29% 6%	567
	11th to 20th	Night	10% 2 16% 30% 35% 8%	564
	21st to end	Night	12% 5% 17% 36% 26% 4	627
September	1st to 10th	Night	13% 4 21% 34% 21% 8%	665
	11th to 20th	Night	12% 4 20% 31% 24% 8%	760
	21st to end	Night	19% 7% 19% 28% 21% 6%	760
October	1st to 10th	Night	20% 5% 28% 30% 14% 3	760
	11th to 20th	Night	25% 8% 32% 25% 9% 1	760
	21st to end	Night	29% 10% 30% 25% 5% 1	836
November	1st to 10th	Night	20% 11% 35% 25% 9% 1	780
	11th to 20th	Night	21% 14% 36% 21% 8% 1	800
	21st to end	Night	25% 13% 37% 21% 3	800
December	1st to 10th	Night	25% 14% 36% 20% 6%	868
	11th to 20th	Night	23% 12% 41% 19% 5% 1	950
	21st to end	Night	28% 12% 36% 19% 4	1045

Page generated at 2024-12-06 03:54:54. Version ac07

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