French Creek State Gamelands
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the French Creek State Gamelands clear sky chart from 2005-11-06 to 2024-11-06.

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	16% 7% 2 6% 4 4 4 4 6% 7% 40%	101327
	Night	16% 7% 2 6% 4 4 4 4 5% 7% 42%	97685
Transparency	Day	41% 7% 12% 23% 15% 2	104931
	Night	40% 7% 12% 23% 16% 2	102220
Seeing	Day	22% 15% 28% 20% 10% 3	14956
	Night	20% 15% 29% 26% 10% 1	24255

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	14% 9% 3 6% 4 4 4 3 4 5% 44%	2517
	11th to 20th	Day	14% 11% 3 10% 6% 4 4 3 5% 6% 34%	2647
	21st to end	Day	19% 10% 3 8% 4 5% 4 3 4 5% 34%	3124
February	1st to 10th	Day	15% 9% 3 6% 5% 4 4 4 6% 6% 39%	1710
	11th to 20th	Day	15% 8% 3 7% 5% 4 4 4 6% 5% 39%	1769
	21st to end	Day	19% 10% 4 6% 4 4 3 3 4 5% 37%	1570
March	1st to 10th	Day	26% 6% 2 6% 4 4 3 3 4 6% 37%	3183
	11th to 20th	Day	10% 5% 2 6% 6% 5% 5% 4 6% 8% 43%	3480
	21st to end	Day	22% 7% 2 6% 3 3 3 2 4 5% 43%	3999
April	1st to 10th	Day	15% 9% 3 5% 4 5% 4 4 5% 7% 40%	2280
	11th to 20th	Day	15% 7% 3 5% 4 4 4 3 5% 6% 43%	2254
	21st to end	Day	16% 6% 2 7% 4 4 4 4 6% 7% 39%	2280
May	1st to 10th	Day	27% 7% 2 6% 4 4 4 4 5% 7% 29%	4063
	11th to 20th	Day	25% 9% 3 8% 5% 4 4 3 5% 6% 28%	4398
	21st to end	Day	12% 6% 2 5% 4 4 4 4 6% 9% 44%	4823
June	1st to 10th	Day	13% 5% 2 6% 5% 4 5% 5% 7% 9% 39%	2660
	11th to 20th	Day	12% 6% 3 6% 5% 5% 5% 4 7% 9% 37%	2660
	21st to end	Day	10% 5% 2 5% 5% 5% 5% 5% 6% 10% 42%	2660
July	1st to 10th	Day	7% 5% 2 6% 5% 6% 7% 5% 8% 11% 37%	4440
	11th to 20th	Day	9% 6% 2 6% 4 5% 5% 5% 8% 9% 40%	4440
	21st to end	Day	11% 8% 3 8% 5% 6% 5% 5% 6% 8% 34%	4667
August	1st to 10th	Day	19% 6% 2 7% 5% 5% 5% 4 7% 7% 34%	4104
	11th to 20th	Day	13% 6% 2 6% 4 4 5% 4 6% 9% 41%	3790
	21st to end	Day	12% 5% 2 5% 4 4 4 3 5% 7% 49%	4180
September	1st to 10th	Day	15% 6% 2 5% 5% 4 5% 3 5% 7% 44%	2280
	11th to 20th	Day	14% 5% 2 4 4 3 3 3 5% 8% 50%	2275
	21st to end	Day	20% 7% 3 7% 4 4 4 3 4 6% 38%	2048
October	1st to 10th	Day	18% 6% 2 5% 4 4 4 3 5% 6% 44%	1900
	11th to 20th	Day	15% 6% 1 6% 3 4 3 3 5% 7% 48%	1900
	21st to end	Day	18% 6% 2 5% 3 3 3 3 5% 6% 45%	2053
November	1st to 10th	Day	13% 7% 2 5% 3 2 3 3 5% 7% 52%	1717
	11th to 20th	Day	16% 5% 2 5% 4 4 4 3 6% 5% 46%	1710
	21st to end	Day	15% 6% 3 5% 4 5% 3 4 5% 7% 44%	1544
December	1st to 10th	Day	18% 9% 2 7% 4 4 3 4 6% 7% 36%	1520
	11th to 20th	Day	20% 8% 2 5% 4 3 4 3 5% 6% 41%	1910
	21st to end	Day	16% 7% 2 8% 5% 6% 6% 4 6% 6% 34%	2772
January	1st to 10th	Night	15% 7% 2 7% 4 4 4 4 4 7% 42%	4429
	11th to 20th	Night	18% 8% 2 6% 4 3 3 3 5% 6% 41%	4312
	21st to end	Night	21% 10% 3 8% 4 3 3 3 3 5% 37%	4532
February	1st to 10th	Night	17% 8% 3 6% 5% 4 4 3 5% 6% 41%	2470
	11th to 20th	Night	17% 8% 3 6% 5% 4 4 4 5% 5% 40%	2294
	21st to end	Night	17% 8% 2 6% 4 3 4 4 5% 6% 40%	1884
March	1st to 10th	Night	21% 10% 2 6% 4 4 3 3 4 5% 37%	3652
	11th to 20th	Night	11% 7% 2 6% 4 4 4 4 5% 6% 49%	3480
	21st to end	Night	15% 9% 3 7% 3 3 2 3 4 5% 46%	3632
April	1st to 10th	Night	16% 7% 2 6% 6% 4 5% 4 5% 6% 41%	1900
	11th to 20th	Night	15% 7% 3 6% 4 4 4 4 5% 7% 42%	1875
	21st to end	Night	18% 7% 2 4 3 4 4 3 5% 6% 43%	1900
May	1st to 10th	Night	24% 8% 3 6% 4 5% 5% 4 5% 8% 29%	2860
	11th to 20th	Night	26% 9% 3 6% 4 3 4 4 5% 6% 28%	2495
	21st to end	Night	13% 6% 2 6% 4 4 4 4 6% 10% 42%	2732
June	1st to 10th	Night	15% 5% 2 5% 5% 4 3 4 5% 9% 42%	1520
	11th to 20th	Night	12% 5% 2 6% 5% 5% 4 4 7% 10% 40%	1520
	21st to end	Night	10% 5% 2 7% 4 4 5% 4 8% 10% 43%	1520
July	1st to 10th	Night	7% 6% 2 8% 6% 5% 5% 4 8% 9% 40%	2520
	11th to 20th	Night	10% 6% 2 6% 5% 5% 5% 5% 8% 10% 38%	2520
	21st to end	Night	14% 7% 3 7% 4 4 5% 5% 6% 8% 38%	2883
August	1st to 10th	Night	20% 6% 2 6% 4 5% 5% 4 6% 8% 35%	2825
	11th to 20th	Night	14% 7% 3 7% 4 4 4 4 6% 7% 40%	3005
	21st to end	Night	11% 6% 2 5% 3 4 4 4 6% 8% 48%	3476
September	1st to 10th	Night	14% 6% 2 6% 3 3 3 3 5% 6% 48%	1900
	11th to 20th	Night	13% 6% 2 4 2 3 3 3 6% 5% 53%	1905
	21st to end	Night	20% 6% 2 5% 4 4 4 4 5% 6% 41%	2128
October	1st to 10th	Night	20% 7% 2 5% 4 3 3 2 3 6% 44%	2280
	11th to 20th	Night	15% 6% 2 4 3 3 3 3 5% 5% 50%	2280
	21st to end	Night	17% 6% 2 4 2 3 3 2 5% 6% 49%	2543
November	1st to 10th	Night	10% 6% 2 5% 4 3 4 3 6% 6% 53%	2483
	11th to 20th	Night	16% 7% 2 5% 4 3 3 3 5% 6% 46%	2470
	21st to end	Night	13% 5% 2 5% 5% 4 5% 4 5% 7% 45%	2631
December	1st to 10th	Night	18% 7% 3 6% 4 4 5% 4 5% 7% 37%	2660
	11th to 20th	Night	18% 6% 2 6% 4 4 4 3 5% 6% 41%	3285
	21st to end	Night	17% 7% 3 6% 5% 5% 4 4 6% 7% 36%	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	40% 6% 14% 25% 12% 3	2518
	11th to 20th	Day	49% 6% 11% 19% 12% 2	2647
	21st to end	Day	50% 7% 12% 21% 9% 1	3124
February	1st to 10th	Day	44% 7% 14% 23% 11% 2	1710
	11th to 20th	Day	45% 6% 9% 25% 13% 2	1778
	21st to end	Day	49% 4 10% 22% 12% 3	1570
March	1st to 10th	Day	48% 6% 9% 26% 9% 2	3183
	11th to 20th	Day	34% 8% 13% 27% 15% 3	3480
	21st to end	Day	44% 5% 9% 19% 19% 3	3999
April	1st to 10th	Day	42% 7% 10% 21% 15% 5%	2280
	11th to 20th	Day	40% 7% 11% 22% 16% 4	2254
	21st to end	Day	41% 8% 11% 19% 17% 4	2280
May	1st to 10th	Day	53% 8% 10% 18% 9% 2	4098
	11th to 20th	Day	54% 8% 12% 17% 8% 1	4402
	21st to end	Day	34% 9% 14% 25% 16% 2	4837
June	1st to 10th	Day	38% 8% 15% 23% 15% 1	2660
	11th to 20th	Day	40% 10% 15% 23% 10% 3	2660
	21st to end	Day	36% 9% 14% 25% 14% 1	2660
July	1st to 10th	Day	37% 12% 15% 21% 12% 2	4370
	11th to 20th	Day	36% 9% 18% 23% 13% 1	4365
	21st to end	Day	46% 9% 10% 18% 16% 2	4518
August	1st to 10th	Day	47% 8% 13% 22% 10%	4091
	11th to 20th	Day	37% 8% 12% 30% 13% 1	3828
	21st to end	Day	33% 7% 11% 28% 19% 2	4180
September	1st to 10th	Day	40% 7% 12% 19% 20% 3	2280
	11th to 20th	Day	32% 5% 11% 25% 23% 4	2275
	21st to end	Day	48% 5% 8% 18% 19% 2	2048
October	1st to 10th	Day	37% 5% 9% 17% 27% 5%	3160
	11th to 20th	Day	25% 4 12% 27% 25% 6%	3140
	21st to end	Day	25% 4 14% 25% 28% 4	3367
November	1st to 10th	Day	34% 4 15% 24% 19% 4	1717
	11th to 20th	Day	37% 6% 11% 24% 20% 2	1710
	21st to end	Day	38% 6% 14% 30% 10% 2	1544
December	1st to 10th	Day	47% 6% 16% 19% 12% 1	1520
	11th to 20th	Day	42% 6% 15% 27% 9% 1	1906
	21st to end	Day	47% 8% 14% 21% 9% 1	2772
January	1st to 10th	Night	41% 5% 13% 26% 12% 3	4429
	11th to 20th	Night	43% 5% 13% 24% 12% 2	4312
	21st to end	Night	50% 4 9% 26% 10% 1	4532
February	1st to 10th	Night	45% 5% 13% 25% 11% 2	2470
	11th to 20th	Night	45% 4 10% 20% 17% 3	2296
	21st to end	Night	44% 5% 10% 22% 15% 4	1884
March	1st to 10th	Night	48% 6% 10% 23% 12% 2	3652
	11th to 20th	Night	33% 8% 13% 29% 15% 2	3480
	21st to end	Night	42% 4 8% 18% 23% 5%	3632
April	1st to 10th	Night	42% 6% 11% 20% 16% 4	1900
	11th to 20th	Night	41% 7% 10% 21% 19% 3	1875
	21st to end	Night	40% 6% 10% 22% 17% 5%	1900
May	1st to 10th	Night	52% 8% 9% 18% 11% 2	2890
	11th to 20th	Night	54% 9% 13% 12% 10% 2	2496
	21st to end	Night	36% 10% 14% 22% 15% 3	2739
June	1st to 10th	Night	39% 7% 12% 23% 18% 1	1520
	11th to 20th	Night	37% 9% 15% 23% 14% 1	1520
	21st to end	Night	34% 9% 15% 27% 13% 2	1520
July	1st to 10th	Night	38% 11% 17% 17% 13% 3	2480
	11th to 20th	Night	38% 10% 16% 22% 12% 1	2472
	21st to end	Night	42% 10% 12% 19% 17% 1	2791
August	1st to 10th	Night	45% 9% 19% 17% 9% 1	2814
	11th to 20th	Night	41% 7% 14% 23% 15% 1	3033
	21st to end	Night	33% 7% 12% 29% 19% 1	3476
September	1st to 10th	Night	38% 7% 10% 21% 21% 3	1900
	11th to 20th	Night	31% 6% 10% 22% 26% 4	1905
	21st to end	Night	43% 6% 9% 20% 20% 2	2128
October	1st to 10th	Night	43% 5% 9% 20% 21% 2	3800
	11th to 20th	Night	24% 5% 10% 29% 27% 4	3779
	21st to end	Night	26% 4 12% 32% 23% 4	4179
November	1st to 10th	Night	32% 6% 12% 26% 19% 5%	2483
	11th to 20th	Night	39% 5% 9% 22% 19% 4	2470
	21st to end	Night	37% 6% 12% 28% 15% 2	2631
December	1st to 10th	Night	47% 6% 12% 21% 13% 1	2660
	11th to 20th	Night	42% 6% 12% 22% 15% 3	3288
	21st to end	Night	44% 8% 14% 23% 10% 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	36% 23% 24% 13% 4	180
	11th to 20th	Day	39% 26% 25% 9%	216
	21st to end	Day	29% 29% 27% 11% 3 1	297
February	1st to 10th	Day	29% 25% 33% 10% 2	270
	11th to 20th	Day	32% 27% 32% 8% 1	377
	21st to end	Day	36% 21% 27% 13% 2	382
March	1st to 10th	Day	33% 18% 30% 15% 4	460
	11th to 20th	Day	31% 25% 28% 11% 3 1	460
	21st to end	Day	31% 25% 30% 10% 4 1	506
April	1st to 10th	Day	28% 24% 30% 13% 4 1	460
	11th to 20th	Day	25% 23% 28% 16% 5% 2	452
	21st to end	Day	29% 19% 32% 15% 4 2	460
May	1st to 10th	Day	34% 17% 27% 14% 6% 2	463
	11th to 20th	Day	24% 16% 31% 19% 8% 2	487
	21st to end	Day	18% 12% 27% 25% 16% 2	529
June	1st to 10th	Day	17% 14% 31% 23% 13% 2	490
	11th to 20th	Day	17% 9% 32% 26% 14% 2	490
	21st to end	Day	14% 11% 32% 27% 13% 4	490
July	1st to 10th	Day	11% 7% 24% 33% 19% 6%	485
	11th to 20th	Day	8% 5% 27% 33% 21% 5%	484
	21st to end	Day	11% 7% 33% 30% 16% 3	532
August	1st to 10th	Day	12% 6% 28% 27% 21% 7%	486
	11th to 20th	Day	13% 6% 23% 33% 19% 6%	479
	21st to end	Day	13% 6% 26% 29% 17% 9%	539
September	1st to 10th	Day	19% 9% 22% 27% 16% 8%	490
	11th to 20th	Day	15% 5% 27% 27% 15% 10%	490
	21st to end	Day	25% 15% 24% 19% 12% 4	490
October	1st to 10th	Day	24% 9% 28% 20% 14% 4	490
	11th to 20th	Day	19% 17% 28% 23% 11% 2	490
	21st to end	Day	22% 18% 32% 16% 10% 2	519
November	1st to 10th	Day	22% 14% 30% 21% 10% 3	381
	11th to 20th	Day	23% 23% 29% 19% 6%	370
	21st to end	Day	24% 20% 34% 19% 2 1	204
December	1st to 10th	Day	33% 23% 29% 10% 3 1	180
	11th to 20th	Day	36% 23% 27% 11% 3	180
	21st to end	Day	28% 24% 28% 14% 6% 1	198
January	1st to 10th	Night	22% 25% 34% 16% 3	760
	11th to 20th	Night	28% 19% 29% 21% 3	760
	21st to end	Night	20% 23% 38% 18% 2	836
February	1st to 10th	Night	25% 20% 34% 20% 1	760
	11th to 20th	Night	27% 28% 32% 12% 1	743
	21st to end	Night	28% 22% 33% 14% 3	628
March	1st to 10th	Night	23% 24% 30% 20% 3	760
	11th to 20th	Night	25% 24% 30% 17% 5%	760
	21st to end	Night	22% 19% 37% 17% 5% 1	836
April	1st to 10th	Night	22% 24% 32% 18% 4	760
	11th to 20th	Night	19% 18% 34% 22% 6%	751
	21st to end	Night	22% 16% 31% 24% 7%	760
May	1st to 10th	Night	24% 12% 32% 25% 6%	607
	11th to 20th	Night	20% 9% 32% 31% 7%	374
	21st to end	Night	17% 9% 24% 37% 12% 1	411
June	1st to 10th	Night	15% 7% 26% 40% 13%	380
	11th to 20th	Night	12% 6% 32% 39% 11%	380
	21st to end	Night	10% 4 29% 43% 13% 1	380
July	1st to 10th	Night	11% 3 23% 42% 20% 1	370
	11th to 20th	Night	7% 4 21% 40% 25% 2	368
	21st to end	Night	10% 5% 22% 39% 23% 2	498
August	1st to 10th	Night	13% 1 18% 42% 24% 2	567
	11th to 20th	Night	15% 4 17% 38% 24% 2	694
	21st to end	Night	14% 4 21% 37% 22% 3	836
September	1st to 10th	Night	16% 5% 26% 31% 18% 3	760
	11th to 20th	Night	14% 5% 19% 34% 23% 4	760
	21st to end	Night	22% 8% 22% 28% 19% 1	760
October	1st to 10th	Night	24% 9% 24% 24% 16% 3	760
	11th to 20th	Night	19% 12% 30% 27% 12%	760
	21st to end	Night	23% 14% 29% 25% 9%	836
November	1st to 10th	Night	16% 13% 32% 27% 12% 1	764
	11th to 20th	Night	22% 18% 28% 24% 7% 1	760
	21st to end	Night	19% 19% 33% 22% 7%	760
December	1st to 10th	Night	27% 18% 30% 18% 5% 1	760
	11th to 20th	Night	20% 21% 33% 21% 5%	760
	21st to end	Night	22% 21% 32% 23% 2	836

Page generated at 2024-11-03 13:19:00. Version ac07

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