Garner State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Garner State Park clear sky chart from 2005-11-06 to 2024-11-05.

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% 6% 2 5% 4 4 4 3 5% 7% 49%	100934
	Night	13% 5% 2 4 3 3 3 3 5% 7% 53%	98217
Transparency	Day	35% 3 9% 22% 20% 11%	104832
	Night	31% 3 10% 21% 20% 14%	102446
Seeing	Day	15% 7% 23% 31% 21% 4	14738
	Night	15% 6% 24% 37% 16% 1	24676

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	11% 7% 2 3 2 2 3 2 3 5% 61%	2847
	11th to 20th	Day	11% 7% 1 3 3 2 3 3 4 5% 58%	2987
	21st to end	Day	16% 7% 2 3 3 2 3 3 4 8% 48%	3487
February	1st to 10th	Day	14% 8% 2 5% 3 3 2 3 4 5% 50%	1900
	11th to 20th	Day	18% 7% 2 5% 4 3 3 3 5% 5% 47%	1849
	21st to end	Day	14% 6% 1 4 2 3 3 3 4 6% 54%	1570
March	1st to 10th	Day	17% 9% 2 5% 4 3 3 3 3 5% 47%	3236
	11th to 20th	Day	24% 9% 3 7% 4 4 3 3 4 4 36%	3480
	21st to end	Day	16% 6% 2 3 3 3 4 3 6% 7% 48%	3814
April	1st to 10th	Day	16% 8% 2 5% 3 3 3 4 5% 6% 46%	2090
	11th to 20th	Day	18% 5% 2 5% 4 3 3 3 5% 6% 46%	2244
	21st to end	Day	17% 6% 2 4 4 4 3 3 4 5% 48%	2284
May	1st to 10th	Day	24% 7% 2 6% 4 4 4 3 5% 6% 37%	4082
	11th to 20th	Day	16% 5% 2 5% 4 4 5% 3 5% 7% 45%	4082
	21st to end	Day	15% 6% 2 6% 4 4 5% 3 6% 8% 40%	4477
June	1st to 10th	Day	8% 4 1 4 4 4 4 3 6% 10% 50%	2470
	11th to 20th	Day	9% 5% 2 6% 4 4 6% 5% 6% 8% 47%	2470
	21st to end	Day	11% 5% 2 6% 5% 5% 7% 5% 7% 9% 39%	2470
July	1st to 10th	Day	9% 5% 2 5% 4 4 4 4 5% 8% 48%	4120
	11th to 20th	Day	7% 3 2 5% 4 4 4 5% 6% 9% 50%	4120
	21st to end	Day	9% 5% 2 5% 4 4 6% 5% 7% 10% 42%	4383
August	1st to 10th	Day	2 2 1 3 3 3 3 3 5% 9% 67%	3785
	11th to 20th	Day	4 3 1 3 3 4 4 3 6% 9% 61%	3726
	21st to end	Day	6% 4 2 5% 4 5% 5% 4 6% 9% 50%	4164
September	1st to 10th	Day	12% 6% 2 7% 6% 5% 5% 5% 5% 7% 40%	2090
	11th to 20th	Day	11% 7% 2 7% 4 5% 5% 4 6% 7% 43%	2090
	21st to end	Day	10% 4 2 6% 4 4 4 4 6% 7% 47%	2090
October	1st to 10th	Day	9% 5% 2 5% 3 3 4 3 5% 7% 54%	2090
	11th to 20th	Day	15% 5% 2 4 3 3 3 3 5% 6% 51%	2085
	21st to end	Day	16% 4 2 4 3 3 3 2 3 4 57%	2090
November	1st to 10th	Day	17% 8% 2 5% 2 4 3 3 4 7% 45%	1836
	11th to 20th	Day	14% 7% 2 5% 3 3 3 3 5% 5% 50%	1710
	21st to end	Day	18% 7% 2 5% 3 3 4 2 3 4 49%	1710
December	1st to 10th	Day	16% 6% 2 4 3 3 3 2 4 6% 49%	1710
	11th to 20th	Day	17% 7% 2 5% 4 4 3 2 4 4 46%	2161
	21st to end	Day	15% 6% 1 4 2 3 2 2 4 4 57%	3135
January	1st to 10th	Night	13% 5% 2 3 2 3 2 2 3 7% 59%	4108
	11th to 20th	Night	11% 4 1 3 2 2 2 1 2 4 68%	4010
	21st to end	Night	20% 7% 2 5% 3 2 2 2 4 5% 48%	4180
February	1st to 10th	Night	14% 7% 1 4 2 2 3 3 5% 5% 54%	2280
	11th to 20th	Night	17% 6% 2 5% 2 2 3 3 4 5% 53%	2218
	21st to end	Night	14% 5% 2 4 4 3 4 3 4 7% 50%	1884
March	1st to 10th	Night	14% 8% 2 5% 3 3 4 3 5% 6% 47%	3621
	11th to 20th	Night	20% 9% 3 7% 4 4 3 3 4 4 39%	3480
	21st to end	Night	16% 8% 2 5% 3 2 3 2 5% 5% 50%	3817
April	1st to 10th	Night	12% 5% 2 4 4 3 3 3 5% 7% 51%	2090
	11th to 20th	Night	17% 6% 2 5% 3 4 3 3 5% 5% 48%	1880
	21st to end	Night	18% 6% 2 5% 4 3 3 3 4 5% 48%	1895
May	1st to 10th	Night	23% 8% 2 4 3 2 3 3 5% 5% 42%	2823
	11th to 20th	Night	13% 5% 2 4 3 3 3 2 4 6% 54%	2823
	21st to end	Night	14% 5% 2 4 3 3 4 3 4 8% 49%	3090
June	1st to 10th	Night	4 2 1 2 3 4 3 4 6% 9% 62%	1710
	11th to 20th	Night	6% 4 1 4 3 3 4 4 5% 8% 57%	1710
	21st to end	Night	9% 5% 2 3 3 4 3 4 5% 10% 52%	1710
July	1st to 10th	Night	6% 4 1 4 3 3 4 4 6% 10% 55%	2850
	11th to 20th	Night	6% 4 2 4 3 4 3 4 6% 10% 54%	2850
	21st to end	Night	13% 6% 2 5% 3 4 4 4 6% 9% 45%	3175
August	1st to 10th	Night	1 1 2 2 2 3 3 5% 8% 72%	3155
	11th to 20th	Night	3 2 1 3 3 3 3 3 5% 10% 63%	3113
	21st to end	Night	6% 4 2 4 3 4 4 4 7% 10% 52%	3487
September	1st to 10th	Night	10% 6% 2 6% 4 5% 4 3 6% 10% 45%	2090
	11th to 20th	Night	12% 6% 2 5% 4 4 4 3 5% 8% 48%	2090
	21st to end	Night	9% 4 2 5% 4 3 4 4 5% 8% 52%	2090
October	1st to 10th	Night	9% 4 1 4 3 2 3 2 4 7% 61%	2090
	11th to 20th	Night	14% 5% 2 4 2 3 3 2 4 6% 56%	2090
	21st to end	Night	14% 4 1 3 2 2 1 2 2 4 65%	2491
November	1st to 10th	Night	15% 6% 2 4 3 2 3 2 3 5% 54%	2339
	11th to 20th	Night	11% 6% 2 4 3 3 2 3 5% 5% 56%	2470
	21st to end	Night	18% 5% 1 4 3 3 3 3 4 6% 49%	2470
December	1st to 10th	Night	14% 6% 1 3 3 2 3 3 5% 6% 53%	2470
	11th to 20th	Night	16% 7% 3 5% 3 3 3 3 4 5% 49%	3036
	21st to end	Night	18% 5% 1 3 2 2 2 2 4 6% 54%	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	29% 1 2 15% 28% 24%	2848
	11th to 20th	Day	31% 2 4 15% 28% 21%	2987
	21st to end	Day	39% 2 5% 16% 28% 11%	3487
February	1st to 10th	Day	39% 2 5% 14% 21% 19%	1900
	11th to 20th	Day	41% 2 4 17% 21% 15%	1859
	21st to end	Day	35% 2 7% 17% 21% 18%	1570
March	1st to 10th	Day	44% 2 5% 14% 20% 15%	3236
	11th to 20th	Day	54% 2 5% 12% 16% 12%	3480
	21st to end	Day	36% 2 8% 17% 17% 19%	3814
April	1st to 10th	Day	39% 3 7% 17% 18% 15%	2090
	11th to 20th	Day	39% 2 5% 22% 16% 15%	2244
	21st to end	Day	41% 3 6% 20% 18% 13%	2284
May	1st to 10th	Day	49% 3 9% 16% 15% 8%	4120
	11th to 20th	Day	40% 2 8% 21% 20% 8%	4086
	21st to end	Day	41% 3 10% 28% 15% 3	4489
June	1st to 10th	Day	30% 4 14% 29% 19% 4	2470
	11th to 20th	Day	33% 5% 11% 27% 18% 6%	2470
	21st to end	Day	38% 6% 12% 24% 15% 4	2470
July	1st to 10th	Day	31% 5% 17% 36% 10% 1	4056
	11th to 20th	Day	28% 6% 18% 31% 15% 2	4051
	21st to end	Day	31% 7% 19% 29% 14% 1	4245
August	1st to 10th	Day	14% 4 12% 43% 27% 1	3772
	11th to 20th	Day	19% 4 21% 42% 12% 2	3762
	21st to end	Day	28% 7% 17% 26% 20% 2	4163
September	1st to 10th	Day	41% 6% 11% 19% 16% 7%	2090
	11th to 20th	Day	39% 5% 10% 23% 17% 5%	2090
	21st to end	Day	35% 5% 9% 21% 19% 11%	2090
October	1st to 10th	Day	19% 3 6% 14% 24% 35%	3480
	11th to 20th	Day	32% 3 6% 16% 19% 24%	3441
	21st to end	Day	30% 3 4 16% 35% 12%	3428
November	1st to 10th	Day	41% 3 8% 20% 19% 10%	1836
	11th to 20th	Day	38% 3 6% 18% 20% 15%	1710
	21st to end	Day	41% 1 4 18% 20% 15%	1710
December	1st to 10th	Day	39% 2 7% 18% 23% 11%	1710
	11th to 20th	Day	44% 1 5% 11% 21% 18%	2159
	21st to end	Day	34% 1 4 15% 30% 15%	3135
January	1st to 10th	Night	29% 1 3 14% 26% 26%	4108
	11th to 20th	Night	24% 1 3 17% 26% 27%	4010
	21st to end	Night	41% 2 4 14% 26% 15%	4180
February	1st to 10th	Night	33% 3 7% 15% 21% 22%	2280
	11th to 20th	Night	36% 2 5% 18% 21% 18%	2218
	21st to end	Night	35% 2 6% 16% 21% 19%	1884
March	1st to 10th	Night	40% 3 8% 15% 21% 14%	3621
	11th to 20th	Night	47% 3 8% 14% 14% 14%	3480
	21st to end	Night	37% 3 9% 16% 16% 18%	3817
April	1st to 10th	Night	33% 3 11% 18% 17% 18%	2090
	11th to 20th	Night	39% 3 9% 16% 15% 18%	1880
	21st to end	Night	39% 2 9% 19% 16% 14%	1895
May	1st to 10th	Night	42% 4 9% 18% 14% 12%	2850
	11th to 20th	Night	34% 2 11% 23% 21% 9%	2824
	21st to end	Night	35% 3 13% 29% 13% 6%	3099
June	1st to 10th	Night	20% 4 18% 33% 22% 3	1710
	11th to 20th	Night	24% 5% 13% 29% 23% 6%	1710
	21st to end	Night	27% 6% 19% 26% 17% 4	1710
July	1st to 10th	Night	24% 6% 24% 37% 8% 1	2805
	11th to 20th	Night	25% 7% 21% 29% 17% 2	2796
	21st to end	Night	33% 6% 21% 29% 10% 1	3074
August	1st to 10th	Night	10% 5% 17% 43% 25% 1	3144
	11th to 20th	Night	18% 5% 27% 38% 10% 2	3143
	21st to end	Night	26% 8% 20% 27% 17% 2	3487
September	1st to 10th	Night	35% 5% 13% 22% 17% 7%	2090
	11th to 20th	Night	34% 6% 16% 21% 16% 6%	2090
	21st to end	Night	30% 5% 11% 23% 18% 12%	2090
October	1st to 10th	Night	17% 3 7% 16% 21% 36%	3480
	11th to 20th	Night	27% 3 7% 13% 26% 24%	3460
	21st to end	Night	25% 2 5% 17% 36% 16%	4103
November	1st to 10th	Night	34% 2 7% 20% 23% 14%	2339
	11th to 20th	Night	31% 3 8% 20% 21% 17%	2470
	21st to end	Night	37% 2 7% 16% 21% 16%	2470
December	1st to 10th	Night	35% 1 9% 19% 22% 14%	2470
	11th to 20th	Night	39% 1 5% 16% 17% 21%	3037
	21st to end	Night	33% 2 5% 15% 27% 18%	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	20% 10% 34% 26% 9%	270
	11th to 20th	Day	23% 13% 29% 24% 10% 1	270
	21st to end	Day	19% 10% 34% 27% 8%	297
February	1st to 10th	Day	28% 11% 26% 25% 9% 1	270
	11th to 20th	Day	26% 10% 36% 21% 7% 1	270
	21st to end	Day	23% 12% 42% 19% 4	225
March	1st to 10th	Day	23% 14% 39% 22% 3	270
	11th to 20th	Day	22% 13% 43% 17% 4	270
	21st to end	Day	21% 13% 43% 20% 3	297
April	1st to 10th	Day	21% 14% 39% 23% 3	270
	11th to 20th	Day	15% 17% 39% 24% 4	442
	21st to end	Day	16% 14% 44% 22% 5%	464
May	1st to 10th	Day	21% 10% 34% 28% 7%	653
	11th to 20th	Day	23% 7% 32% 29% 9% 1	675
	21st to end	Day	20% 7% 29% 32% 11%	734
June	1st to 10th	Day	8% 4 19% 47% 21% 3	680
	11th to 20th	Day	11% 2 19% 49% 18% 2	680
	21st to end	Day	12% 3 14% 35% 29% 6%	680
July	1st to 10th	Day	14% 3 10% 32% 33% 8%	671
	11th to 20th	Day	7% 1 5% 36% 44% 7%	668
	21st to end	Day	6% 1 7% 36% 44% 7%	693
August	1st to 10th	Day	2 5% 41% 41% 10%	487
	11th to 20th	Day	7% 1 8% 33% 42% 10%	477
	21st to end	Day	7% 1 7% 31% 40% 14%	536
September	1st to 10th	Day	9% 1 9% 29% 38% 14%	300
	11th to 20th	Day	8% 1 9% 24% 42% 17%	300
	21st to end	Day	9% 3 7% 27% 43% 10%	300
October	1st to 10th	Day	9% 3 14% 37% 30% 8%	300
	11th to 20th	Day	13% 4 16% 45% 20% 2	300
	21st to end	Day	21% 11% 24% 26% 16% 2	330
November	1st to 10th	Day	23% 4 24% 31% 15% 2	282
	11th to 20th	Day	21% 9% 22% 31% 12% 5%	270
	21st to end	Day	25% 12% 31% 22% 8% 2	270
December	1st to 10th	Day	19% 9% 27% 29% 15% 2	270
	11th to 20th	Day	24% 14% 28% 23% 10%	270
	21st to end	Day	21% 7% 34% 25% 12% 1	297
January	1st to 10th	Night	17% 9% 26% 38% 9% 1	950
	11th to 20th	Night	20% 9% 26% 37% 8%	879
	21st to end	Night	23% 8% 27% 34% 8%	836
February	1st to 10th	Night	22% 11% 28% 33% 6% 1	760
	11th to 20th	Night	22% 11% 30% 31% 7%	744
	21st to end	Night	20% 10% 38% 30% 2	628
March	1st to 10th	Night	22% 10% 34% 28% 5% 1	699
	11th to 20th	Night	20% 10% 35% 30% 5%	570
	21st to end	Night	17% 10% 44% 24% 5%	627
April	1st to 10th	Night	13% 12% 42% 31% 2	570
	11th to 20th	Night	19% 12% 43% 23% 2	563
	21st to end	Night	19% 11% 41% 25% 4	570
May	1st to 10th	Night	18% 10% 39% 29% 4	570
	11th to 20th	Night	19% 7% 33% 34% 6%	561
	21st to end	Night	17% 6% 34% 34% 8%	617
June	1st to 10th	Night	5% 2 29% 48% 15%	570
	11th to 20th	Night	8% 2 30% 49% 11%	570
	21st to end	Night	9% 4 20% 47% 20% 1	570
July	1st to 10th	Night	11% 2 12% 52% 22% 1	555
	11th to 20th	Night	5% 2 12% 49% 31% 2	552
	21st to end	Night	6% 2 9% 48% 34% 1	624
August	1st to 10th	Night	1 9% 48% 40% 1	567
	11th to 20th	Night	5% 1 7% 49% 36% 2	564
	21st to end	Night	6% 1 10% 41% 38% 3	627
September	1st to 10th	Night	9% 1 11% 42% 35% 3	570
	11th to 20th	Night	13% 1 7% 42% 35% 2	570
	21st to end	Night	10% 1 14% 38% 33% 4	570
October	1st to 10th	Night	9% 4 11% 47% 28% 2	570
	11th to 20th	Night	16% 3 19% 39% 21% 1	570
	21st to end	Night	15% 6% 23% 32% 22% 3	819
November	1st to 10th	Night	19% 4 17% 37% 21% 2	819
	11th to 20th	Night	14% 6% 20% 40% 17% 2	950
	21st to end	Night	22% 7% 23% 34% 13% 1	950
December	1st to 10th	Night	18% 5% 23% 38% 14% 2	950
	11th to 20th	Night	23% 9% 23% 35% 10%	950
	21st to end	Night	20% 8% 24% 39% 9% 1	1045

Page generated at 2024-11-03 01:11:08. Version ac07

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