Pardee Reservoir Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pardee Reservoir Recreation Area clear sky chart from 2005-11-06 to 2025-07-21.

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	8% 3 1 3 2 2 3 2 4 5% 66%	124047
	Night	11% 4 1 3 3 3 3 2 4 5% 61%	123951
Transparency	Day	22% 3 7% 19% 25% 24%	123800
	Night	26% 3 8% 20% 24% 19%	123785
Seeing	Day	10% 4 19% 33% 25% 8%	16114
	Night	12% 2 8% 39% 33% 7%	25452

By Month

Percentage Cloud Cover SW (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	19% 6% 2 4 3 3 3 3 5% 7% 46%	3639
	11th to 20th	Day	16% 6% 2 6% 4 3 3 2 2 3 53%	4008
	21st to end	Day	17% 7% 2 6% 4 4 4 3 4 6% 43%	4510
February	1st to 10th	Day	20% 6% 1 5% 3 3 3 4 4 4 46%	1800
	11th to 20th	Day	16% 6% 2 5% 3 3 4 4 4 6% 45%	1913
	21st to end	Day	16% 6% 2 5% 4 4 3 3 4 5% 47%	1650
March	1st to 10th	Day	16% 9% 3 7% 5% 4 5% 4 6% 7% 35%	4636
	11th to 20th	Day	17% 5% 2 4 3 3 4 3 5% 6% 48%	5000
	21st to end	Day	15% 7% 3 6% 4 4 4 4 6% 8% 39%	5722
April	1st to 10th	Day	14% 6% 2 4 3 4 4 3 5% 7% 50%	2400
	11th to 20th	Day	11% 4 2 4 3 2 4 3 4 6% 57%	2369
	21st to end	Day	8% 4 2 3 2 2 3 2 5% 7% 62%	2400
May	1st to 10th	Day	5% 3 1 2 1 1 1 2 3 5% 76%	5473
	11th to 20th	Day	3 2 1 2 2 1 2 2 2 4 80%	6267
	21st to end	Day	2 1 1 1 1 2 1 3 4 82%	6902
June	1st to 10th	Day	4 3 1 3 2 2 2 2 3 7% 70%	2800
	11th to 20th	Day	1 1 1 1 1 2 2 3 5% 82%	2800
	21st to end	Day	2 1 1 2 1 1 1 1 2 3 85%	2800
July	1st to 10th	Day	1 1 1 1 1 2 93%	4560
	11th to 20th	Day	1 1 1 1 1 2 1 2 3 85%	4560
	21st to end	Day	1 1 1 1 1 1 2 3 89%	4461
August	1st to 10th	Day	2 1 1 2 1 1 2 2 3 3 81%	4091
	11th to 20th	Day	1 1 1 1 1 1 2 3 89%	3731
	21st to end	Day	1 1 1 1 1 1 1 1 1 2 89%	4180
September	1st to 10th	Day	2 1 1 1 1 1 1 2 3 89%	2280
	11th to 20th	Day	2 1 1 2 2 2 3 2 3 5% 77%	2280
	21st to end	Day	2 2 1 2 2 1 2 1 3 4 80%	2063
October	1st to 10th	Day	2 1 1 2 2 2 2 2 4 5% 77%	3180
	11th to 20th	Day	4 2 1 2 2 2 3 2 3 4 76%	3161
	21st to end	Day	5% 2 1 3 3 3 3 3 5% 6% 65%	3448
November	1st to 10th	Day	10% 4 1 3 3 3 3 2 5% 8% 57%	1801
	11th to 20th	Day	11% 5% 1 4 4 3 4 3 5% 6% 54%	1800
	21st to end	Day	13% 4 1 4 3 3 3 3 5% 7% 54%	1710
December	1st to 10th	Day	8% 3 1 4 3 3 4 3 4 8% 58%	2620
	11th to 20th	Day	26% 7% 2 5% 3 4 4 3 4 7% 34%	3028
	21st to end	Day	22% 7% 3 6% 5% 5% 6% 4 6% 8% 29%	4004
January	1st to 10th	Night	12% 6% 2 5% 3 3 4 3 6% 8% 49%	6306
	11th to 20th	Night	15% 4 2 5% 3 3 3 2 4 4 54%	5951
	21st to end	Night	18% 6% 2 5% 4 4 4 3 4 5% 47%	6468
February	1st to 10th	Night	19% 6% 2 4 3 3 3 2 4 5% 49%	2600
	11th to 20th	Night	15% 5% 2 4 4 3 3 4 4 7% 48%	2373
	21st to end	Night	17% 7% 2 4 3 3 3 3 4 5% 51%	1980
March	1st to 10th	Night	20% 9% 3 6% 4 4 4 3 4 6% 38%	5254
	11th to 20th	Night	22% 7% 2 4 3 3 3 2 3 4 49%	5000
	21st to end	Night	20% 7% 2 5% 4 4 4 3 5% 7% 41%	5240
April	1st to 10th	Night	12% 5% 2 4 3 3 4 3 5% 6% 52%	2000
	11th to 20th	Night	10% 5% 2 4 3 3 3 3 5% 6% 57%	1979
	21st to end	Night	7% 4 1 3 2 3 3 3 4 7% 64%	2000
May	1st to 10th	Night	3 3 1 3 1 2 2 2 3 5% 75%	4524
	11th to 20th	Night	3 2 1 2 2 1 2 2 3 4 78%	3622
	21st to end	Night	2 1 1 1 1 2 2 2 4 83%	3972
June	1st to 10th	Night	4 2 1 3 2 2 2 3 5% 6% 70%	1600
	11th to 20th	Night	1 1 1 1 1 2 2 3 4 85%	1600
	21st to end	Night	1 1 1 1 2 1 1 1 2 2 86%	1600
July	1st to 10th	Night	1 1 1 1 1 94%	2620
	11th to 20th	Night	2 1 1 2 2 2 2 2 3 3 81%	2620
	21st to end	Night	1 1 1 1 1 1 2 2 3 86%	3099
August	1st to 10th	Night	2 2 1 2 1 1 2 2 4 4 78%	2848
	11th to 20th	Night	1 1 1 1 2 1 2 3 87%	3117
	21st to end	Night	3 1 1 1 1 1 1 1 2 89%	3498
September	1st to 10th	Night	2 1 1 1 1 1 1 2 3 89%	1900
	11th to 20th	Night	3 2 1 2 2 1 2 1 3 4 80%	1900
	21st to end	Night	2 1 1 1 2 2 2 2 4 82%	2112
October	1st to 10th	Night	3 1 1 2 2 2 2 2 3 4 79%	3800
	11th to 20th	Night	3 2 1 2 2 1 2 2 3 4 79%	3777
	21st to end	Night	6% 2 1 3 3 3 3 3 3 5% 68%	4121
November	1st to 10th	Night	11% 4 2 2 3 2 3 2 5% 6% 60%	2497
	11th to 20th	Night	10% 4 2 4 2 3 3 3 4 7% 58%	2600
	21st to end	Night	13% 4 1 3 3 3 3 3 3 6% 57%	2685
December	1st to 10th	Night	10% 3 1 3 2 3 3 3 4 6% 61%	4560
	11th to 20th	Night	23% 5% 3 6% 4 5% 4 3 7% 9% 31%	5176
	21st to end	Night	22% 8% 3 8% 5% 5% 5% 4 5% 6% 29%	6952

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% 4 19% 23% 11% 4	3639
	11th to 20th	Day	39% 2 6% 16% 23% 13%	4008
	21st to end	Day	43% 3 8% 13% 28% 4	4510
February	1st to 10th	Day	41% 3 9% 22% 16% 8%	1800
	11th to 20th	Day	39% 4 9% 21% 21% 6%	1923
	21st to end	Day	40% 3 9% 24% 20% 5%	1650
March	1st to 10th	Day	46% 5% 9% 19% 19% 2	4636
	11th to 20th	Day	36% 4 11% 31% 11% 7%	5000
	21st to end	Day	40% 6% 15% 26% 11% 2	5722
April	1st to 10th	Day	34% 3 12% 26% 18% 7%	2400
	11th to 20th	Day	27% 4 12% 27% 22% 7%	2372
	21st to end	Day	22% 3 12% 32% 26% 5%	2400
May	1st to 10th	Day	14% 2 6% 29% 33% 16%	5473
	11th to 20th	Day	11% 2 5% 30% 41% 12%	6270
	21st to end	Day	9% 2 7% 27% 44% 12%	6904
June	1st to 10th	Day	17% 3 9% 26% 32% 14%	2800
	11th to 20th	Day	7% 2 6% 22% 34% 30%	2800
	21st to end	Day	9% 1 1 11% 34% 45%	2800
July	1st to 10th	Day	3 1 5% 14% 77%	4491
	11th to 20th	Day	7% 1 2 7% 15% 69%	4485
	21st to end	Day	5% 1 1 4 23% 66%	4320
August	1st to 10th	Day	10% 1 2 6% 20% 61%	4076
	11th to 20th	Day	4 1 1 5% 33% 56%	3767
	21st to end	Day	6% 1 2 7% 35% 48%	4179
September	1st to 10th	Day	5% 1 1 7% 28% 57%	2280
	11th to 20th	Day	11% 3 3 20% 39% 24%	2280
	21st to end	Day	10% 2 3 18% 36% 31%	2063
October	1st to 10th	Day	11% 2 4 12% 21% 51%	3180
	11th to 20th	Day	13% 3 5% 22% 36% 21%	3161
	21st to end	Day	20% 3 5% 19% 38% 15%	3448
November	1st to 10th	Day	27% 2 9% 27% 22% 12%	1801
	11th to 20th	Day	31% 4 11% 27% 22% 6%	1800
	21st to end	Day	30% 3 9% 23% 26% 9%	1710
December	1st to 10th	Day	26% 3 12% 29% 24% 6%	2620
	11th to 20th	Day	51% 4 10% 18% 14% 4	3028
	21st to end	Day	52% 6% 18% 15% 8% 2	4004
January	1st to 10th	Night	33% 5% 22% 24% 11% 6%	6306
	11th to 20th	Night	35% 3 10% 17% 25% 11%	5951
	21st to end	Night	40% 3 7% 14% 27% 8%	6468
February	1st to 10th	Night	39% 2 8% 22% 20% 9%	2600
	11th to 20th	Night	36% 4 8% 24% 21% 7%	2374
	21st to end	Night	36% 3 8% 28% 19% 7%	1980
March	1st to 10th	Night	47% 4 9% 18% 18% 4	5254
	11th to 20th	Night	40% 3 11% 25% 13% 8%	5000
	21st to end	Night	43% 5% 12% 25% 13% 3	5240
April	1st to 10th	Night	32% 5% 12% 24% 22% 5%	2000
	11th to 20th	Night	28% 3 13% 27% 19% 9%	1979
	21st to end	Night	21% 4 12% 33% 24% 6%	2000
May	1st to 10th	Night	13% 4 11% 26% 29% 18%	4521
	11th to 20th	Night	12% 2 6% 30% 39% 10%	3622
	21st to end	Night	8% 2 8% 31% 43% 8%	3972
June	1st to 10th	Night	16% 3 11% 29% 29% 12%	1600
	11th to 20th	Night	6% 2 6% 21% 36% 29%	1600
	21st to end	Night	8% 1 2 13% 32% 44%	1600
July	1st to 10th	Night	2 1 1 6% 14% 76%	2580
	11th to 20th	Night	9% 2 2 7% 15% 66%	2572
	21st to end	Night	7% 1 1 4 24% 62%	3002
August	1st to 10th	Night	10% 2 1 8% 24% 55%	2839
	11th to 20th	Night	6% 1 1 7% 36% 50%	3147
	21st to end	Night	7% 1 1 9% 38% 44%	3498
September	1st to 10th	Night	5% 1 2 7% 30% 55%	1900
	11th to 20th	Night	10% 3 3 19% 41% 24%	1900
	21st to end	Night	9% 1 3 19% 35% 33%	2112
October	1st to 10th	Night	12% 2 3 11% 20% 52%	3800
	11th to 20th	Night	11% 2 6% 27% 32% 23%	3777
	21st to end	Night	20% 3 4 19% 34% 21%	4121
November	1st to 10th	Night	25% 3 9% 24% 22% 18%	2497
	11th to 20th	Night	27% 3 10% 26% 25% 9%	2600
	21st to end	Night	29% 4 8% 22% 27% 11%	2685
December	1st to 10th	Night	25% 3 9% 27% 26% 10%	4560
	11th to 20th	Night	48% 5% 9% 18% 16% 3	5176
	21st to end	Night	54% 6% 14% 15% 8% 3	6952

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	33% 8% 15% 23% 17% 5%	200
	11th to 20th	Day	18% 3 20% 30% 21% 8%	360
	21st to end	Day	19% 3 18% 27% 25% 8%	440
February	1st to 10th	Day	26% 7% 16% 24% 22% 6%	400
	11th to 20th	Day	19% 6% 24% 29% 17% 5%	478
	21st to end	Day	18% 7% 23% 33% 16% 2	414
March	1st to 10th	Day	23% 6% 25% 30% 14% 3	500
	11th to 20th	Day	24% 6% 22% 26% 17% 6%	500
	21st to end	Day	20% 7% 23% 27% 18% 5%	550
April	1st to 10th	Day	18% 8% 24% 27% 19% 5%	500
	11th to 20th	Day	12% 8% 26% 30% 18% 6%	492
	21st to end	Day	8% 6% 23% 32% 22% 9%	500
May	1st to 10th	Day	8% 8% 28% 30% 20% 6%	503
	11th to 20th	Day	8% 8% 24% 28% 25% 8%	528
	21st to end	Day	6% 5% 19% 33% 27% 9%	573
June	1st to 10th	Day	5% 5% 18% 36% 27% 10%	530
	11th to 20th	Day	3 5% 25% 38% 23% 6%	530
	21st to end	Day	2 2 18% 40% 28% 9%	530
July	1st to 10th	Day	1 1 18% 44% 28% 8%	526
	11th to 20th	Day	1 11% 43% 35% 9%	524
	21st to end	Day	1 11% 43% 33% 11%	532
August	1st to 10th	Day	4 1 14% 43% 29% 10%	487
	11th to 20th	Day	1 20% 38% 28% 12%	477
	21st to end	Day	1 1 14% 42% 31% 11%	539
September	1st to 10th	Day	3 1 14% 45% 29% 9%	490
	11th to 20th	Day	3 2 21% 37% 30% 7%	490
	21st to end	Day	2 4 19% 36% 30% 9%	490
October	1st to 10th	Day	4 5% 18% 34% 28% 11%	490
	11th to 20th	Day	6% 4 16% 26% 38% 11%	490
	21st to end	Day	8% 4 17% 32% 31% 8%	539
November	1st to 10th	Day	14% 2 14% 28% 31% 11%	337
	11th to 20th	Day	13% 3 15% 29% 30% 10%	300
	21st to end	Day	15% 2 16% 30% 30% 7%	255
December	1st to 10th	Day	17% 2 15% 30% 24% 13%	200
	11th to 20th	Day	22% 4 19% 24% 23% 9%	200
	21st to end	Day	23% 5% 17% 27% 22% 5%	220
January	1st to 10th	Night	21% 2 11% 35% 23% 8%	800
	11th to 20th	Night	15% 3 11% 39% 25% 8%	800
	21st to end	Night	20% 2 8% 37% 26% 7%	880
February	1st to 10th	Night	22% 2 12% 37% 22% 6%	800
	11th to 20th	Night	18% 4 12% 37% 23% 7%	784
	21st to end	Night	20% 3 10% 46% 18% 3	660
March	1st to 10th	Night	23% 2 12% 37% 21% 4	800
	11th to 20th	Night	22% 3 11% 35% 24% 6%	800
	21st to end	Night	20% 3 12% 38% 25% 2	880
April	1st to 10th	Night	14% 2 12% 43% 27% 2	800
	11th to 20th	Night	12% 3 12% 40% 27% 6%	791
	21st to end	Night	8% 1 10% 44% 32% 5%	800
May	1st to 10th	Night	8% 2 11% 44% 29% 6%	790
	11th to 20th	Night	6% 2 8% 39% 41% 5%	400
	21st to end	Night	4 1 6% 42% 43% 3	433
June	1st to 10th	Night	5% 5% 42% 42% 6%	400
	11th to 20th	Night	1 1 6% 48% 41% 4	400
	21st to end	Night	2 5% 43% 47% 4	400
July	1st to 10th	Night	1 36% 59% 3	390
	11th to 20th	Night	3 1 2 37% 53% 5%	388
	21st to end	Night	1 1 29% 58% 10%	614
August	1st to 10th	Night	3 2 32% 57% 6%	567
	11th to 20th	Night	1 5% 42% 44% 8%	743
	21st to end	Night	2 2 40% 50% 7%	836
September	1st to 10th	Night	2 2 40% 48% 7%	760
	11th to 20th	Night	3 1 5% 39% 42% 9%	760
	21st to end	Night	2 1 6% 38% 44% 10%	760
October	1st to 10th	Night	6% 1 6% 41% 37% 9%	760
	11th to 20th	Night	7% 2 8% 36% 38% 9%	760
	21st to end	Night	7% 1 8% 39% 31% 14%	836
November	1st to 10th	Night	13% 2 6% 39% 29% 12%	780
	11th to 20th	Night	12% 1 10% 42% 29% 7%	800
	21st to end	Night	13% 2 10% 39% 27% 9%	800
December	1st to 10th	Night	18% 1 9% 40% 25% 8%	800
	11th to 20th	Night	25% 2 8% 37% 23% 5%	800
	21st to end	Night	23% 4 12% 37% 19% 5%	880

Page generated at 2025-07-17 22:09:58. Version ac07

Copyright © 2025 Attilla Danko.