Winnemucca
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Winnemucca clear sky chart from 2005-11-06 to 2026-08-30.

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	3 5% 2 4 4 4 4 3 5% 7% 60%	152364
	Night	4 6% 2 6% 4 4 4 4 5% 7% 55%	147222
Transparency	Day	23% 6% 8% 17% 24% 22%	147264
	Night	28% 6% 9% 17% 22% 17%	143312
Seeing	Day	7% 11% 24% 30% 21% 6%	17099
	Night	8% 6% 16% 39% 25% 4	26396

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	4 10% 4 9% 6% 5% 6% 5% 8% 9% 34%	4722
	11th to 20th	Day	4 6% 2 6% 4 4 4 4 5% 7% 54%	4740
	21st to end	Day	4 8% 3 7% 6% 7% 7% 5% 7% 8% 37%	5322
February	1st to 10th	Day	5% 8% 3 6% 7% 5% 6% 6% 8% 10% 37%	1995
	11th to 20th	Day	3 8% 3 7% 6% 6% 6% 5% 9% 10% 36%	2050
	21st to end	Day	3 8% 3 8% 6% 6% 5% 5% 7% 10% 40%	1730
March	1st to 10th	Day	5% 13% 3 9% 6% 6% 5% 4 5% 9% 34%	4618
	11th to 20th	Day	2 6% 2 6% 5% 5% 6% 5% 8% 12% 42%	4767
	21st to end	Day	3 7% 3 8% 6% 6% 6% 5% 7% 9% 40%	6090
April	1st to 10th	Day	5% 10% 3 7% 5% 5% 5% 4 7% 10% 40%	2520
	11th to 20th	Day	5% 7% 2 6% 5% 5% 4 4 6% 8% 49%	2489
	21st to end	Day	7% 6% 2 6% 4 4 4 3 6% 9% 49%	2635
May	1st to 10th	Day	4 5% 1 4 3 3 3 3 4 7% 63%	7626
	11th to 20th	Day	3 4 1 3 3 3 3 3 5% 5% 66%	7764
	21st to end	Day	3 3 1 4 3 3 3 3 5% 6% 65%	8992
June	1st to 10th	Day	4 4 1 4 4 3 4 3 5% 7% 59%	2940
	11th to 20th	Day	4 3 1 3 3 2 2 3 4 6% 71%	2940
	21st to end	Day	2 2 1 3 2 2 3 2 4 5% 74%	2940
July	1st to 10th	Day	1 1 1 1 1 2 2 3 3 85%	8219
	11th to 20th	Day	1 1 1 2 2 2 3 2 3 5% 78%	8220
	21st to end	Day	1 1 1 2 2 3 3 3 5% 6% 73%	8922
August	1st to 10th	Day	2 1 1 2 2 2 2 2 3 5% 77%	6094
	11th to 20th	Day	1 1 1 1 1 1 1 2 3 87%	5489
	21st to end	Day	2 2 1 3 3 2 3 3 4 5% 72%	6093
September	1st to 10th	Day	1 1 1 2 2 2 3 2 3 4 80%	2400
	11th to 20th	Day	2 2 1 3 2 3 3 3 4 5% 71%	2269
	21st to end	Day	2 3 1 3 1 2 3 2 4 5% 73%	2200
October	1st to 10th	Day	3 3 1 3 2 3 2 2 4 6% 73%	3573
	11th to 20th	Day	6% 4 1 3 2 2 2 3 3 5% 68%	3261
	21st to end	Day	2 4 1 4 4 4 5% 4 6% 9% 57%	3200
November	1st to 10th	Day	4 9% 2 5% 4 4 4 4 5% 7% 51%	1854
	11th to 20th	Day	6% 6% 2 5% 4 4 5% 4 8% 10% 47%	1890
	21st to end	Day	4 7% 3 7% 4 4 5% 4 7% 6% 49%	1890
December	1st to 10th	Day	3 5% 2 5% 4 3 4 3 4 7% 60%	2710
	11th to 20th	Day	6% 10% 3 9% 7% 7% 8% 6% 7% 9% 28%	3108
	21st to end	Day	4 9% 4 8% 7% 7% 7% 5% 7% 11% 31%	4092
January	1st to 10th	Night	3 10% 4 9% 6% 5% 6% 6% 8% 9% 35%	8172
	11th to 20th	Night	4 6% 2 7% 5% 5% 4 3 4 5% 55%	8220
	21st to end	Night	4 8% 2 6% 5% 5% 6% 5% 7% 8% 43%	8863
February	1st to 10th	Night	4 8% 3 8% 5% 4 6% 5% 7% 8% 42%	2624
	11th to 20th	Night	4 8% 3 8% 6% 5% 5% 4 7% 10% 41%	2458
	21st to end	Night	3 9% 3 9% 5% 5% 6% 5% 7% 9% 38%	2076
March	1st to 10th	Night	5% 13% 4 9% 5% 4 4 4 6% 7% 38%	5496
	11th to 20th	Night	3 7% 2 7% 5% 5% 5% 4 6% 9% 47%	5440
	21st to end	Night	4 7% 2 8% 6% 5% 6% 4 7% 8% 41%	5123
April	1st to 10th	Night	5% 7% 3 6% 6% 4 4 5% 6% 8% 46%	2100
	11th to 20th	Night	4 7% 3 5% 4 3 4 4 5% 8% 53%	2079
	21st to end	Night	7% 7% 2 6% 4 4 3 4 4 6% 54%	1985
May	1st to 10th	Night	5% 5% 1 4 3 3 3 2 4 6% 64%	5321
	11th to 20th	Night	3 4 1 4 3 3 3 3 5% 6% 66%	5101
	21st to end	Night	5% 3 1 3 3 3 3 3 5% 7% 63%	5181
June	1st to 10th	Night	5% 3 2 5% 4 3 4 4 6% 6% 57%	1680
	11th to 20th	Night	4 2 1 3 3 4 3 2 5% 5% 68%	1680
	21st to end	Night	2 2 1 2 3 3 4 3 4 6% 71%	1680
July	1st to 10th	Night	1 1 2 2 2 2 2 3 4 80%	4740
	11th to 20th	Night	3 2 1 3 3 3 3 3 4 5% 70%	4740
	21st to end	Night	1 2 1 3 3 4 5% 4 7% 8% 62%	5153
August	1st to 10th	Night	3 2 1 3 2 3 4 3 4 6% 71%	3927
	11th to 20th	Night	1 1 1 2 2 2 3 2 3 4 80%	4597
	21st to end	Night	4 2 1 3 3 3 3 3 4 4 68%	5105
September	1st to 10th	Night	3 2 1 4 2 2 2 1 3 5% 75%	2000
	11th to 20th	Night	3 4 1 4 2 3 3 3 4 5% 68%	2130
	21st to end	Night	3 2 1 3 2 2 2 2 4 5% 74%	2200
October	1st to 10th	Night	3 2 1 3 3 2 3 2 3 4 73%	3622
	11th to 20th	Night	3 3 1 4 2 2 3 3 4 5% 71%	3897
	21st to end	Night	4 4 1 4 3 4 4 3 6% 7% 60%	4598
November	1st to 10th	Night	6% 7% 3 5% 5% 4 5% 4 6% 7% 50%	2665
	11th to 20th	Night	6% 6% 2 6% 5% 4 5% 4 5% 8% 49%	2730
	21st to end	Night	4 6% 3 7% 5% 4 5% 4 6% 8% 49%	2730
December	1st to 10th	Night	4 5% 2 5% 4 3 3 3 5% 6% 60%	4687
	11th to 20th	Night	5% 9% 3 9% 6% 6% 7% 5% 7% 10% 33%	5316
	21st to end	Night	6% 11% 4 10% 7% 7% 7% 5% 7% 7% 28%	7106

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% 13% 20% 19% 7%	4723
	11th to 20th	Day	28% 7% 12% 19% 28% 7%	4740
	21st to end	Day	40% 9% 13% 10% 20% 8%	5322
February	1st to 10th	Day	38% 8% 16% 24% 11% 2	1995
	11th to 20th	Day	38% 10% 15% 24% 12% 1	2060
	21st to end	Day	34% 10% 18% 24% 10% 4	1730
March	1st to 10th	Day	44% 8% 10% 23% 10% 4	4618
	11th to 20th	Day	29% 9% 19% 25% 17% 1	4767
	21st to end	Day	37% 10% 13% 21% 15% 3	6090
April	1st to 10th	Day	39% 6% 13% 23% 16% 4	2520
	11th to 20th	Day	32% 8% 10% 24% 21% 6%	2492
	21st to end	Day	32% 6% 12% 26% 21% 4	2635
May	1st to 10th	Day	21% 5% 6% 21% 36% 11%	7626
	11th to 20th	Day	19% 5% 6% 18% 37% 15%	7767
	21st to end	Day	19% 5% 6% 20% 40% 10%	8994
June	1st to 10th	Day	23% 6% 7% 19% 32% 12%	2940
	11th to 20th	Day	17% 3 5% 16% 31% 27%	2940
	21st to end	Day	12% 3 3 12% 32% 37%	2940
July	1st to 10th	Day	6% 2 2 6% 19% 65%	8151
	11th to 20th	Day	10% 3 3 6% 16% 63%	8145
	21st to end	Day	11% 4 3 10% 27% 45%	8723
August	1st to 10th	Day	14% 3 3 6% 22% 53%	4474
	11th to 20th	Day	7% 2 2 6% 24% 59%	4005
	21st to end	Day	11% 3 2 10% 32% 42%	4420
September	1st to 10th	Day	10% 2 2 9% 29% 47%	2400
	11th to 20th	Day	15% 4 5% 15% 31% 31%	2269
	21st to end	Day	16% 3 3 19% 31% 29%	2200
October	1st to 10th	Day	16% 3 5% 11% 34% 31%	3573
	11th to 20th	Day	20% 3 4 20% 41% 12%	3261
	21st to end	Day	22% 7% 9% 29% 24% 10%	3200
November	1st to 10th	Day	33% 7% 10% 23% 22% 5%	1854
	11th to 20th	Day	31% 8% 13% 30% 16% 2	1890
	21st to end	Day	35% 7% 13% 25% 17% 3	1890
December	1st to 10th	Day	25% 5% 10% 22% 34% 5%	2710
	11th to 20th	Day	48% 10% 13% 17% 10% 1	3108
	21st to end	Day	43% 12% 15% 22% 7%	4092
January	1st to 10th	Night	41% 12% 17% 23% 7%	8172
	11th to 20th	Night	30% 7% 10% 16% 25% 13%	8220
	21st to end	Night	35% 7% 14% 12% 24% 8%	8863
February	1st to 10th	Night	38% 7% 17% 23% 13% 2	2624
	11th to 20th	Night	37% 7% 15% 26% 13% 2	2459
	21st to end	Night	38% 9% 15% 23% 11% 5%	2076
March	1st to 10th	Night	41% 8% 10% 20% 14% 7%	5496
	11th to 20th	Night	31% 9% 13% 27% 19% 2	5440
	21st to end	Night	36% 11% 17% 22% 12% 2	5123
April	1st to 10th	Night	35% 7% 14% 24% 17% 4	2100
	11th to 20th	Night	29% 7% 12% 26% 18% 8%	2079
	21st to end	Night	32% 5% 12% 24% 23% 4	1985
May	1st to 10th	Night	21% 6% 5% 22% 35% 10%	5319
	11th to 20th	Night	17% 6% 5% 18% 42% 12%	5102
	21st to end	Night	19% 6% 5% 20% 41% 8%	5182
June	1st to 10th	Night	27% 6% 7% 22% 28% 10%	1680
	11th to 20th	Night	18% 5% 6% 15% 36% 21%	1680
	21st to end	Night	14% 5% 4 11% 30% 36%	1680
July	1st to 10th	Night	10% 3 2 6% 17% 62%	4700
	11th to 20th	Night	15% 4 3 5% 14% 59%	4692
	21st to end	Night	17% 6% 4 12% 22% 39%	5040
August	1st to 10th	Night	18% 4 3 7% 18% 51%	2874
	11th to 20th	Night	12% 3 2 6% 22% 56%	3347
	21st to end	Night	15% 2 2 8% 28% 45%	3698
September	1st to 10th	Night	14% 2 3 7% 26% 48%	2000
	11th to 20th	Night	18% 4 4 14% 26% 34%	2130
	21st to end	Night	14% 3 5% 15% 29% 34%	2200
October	1st to 10th	Night	17% 3 4 12% 30% 34%	3622
	11th to 20th	Night	17% 4 4 19% 39% 17%	3897
	21st to end	Night	22% 5% 6% 26% 30% 11%	4598
November	1st to 10th	Night	32% 7% 11% 21% 21% 8%	2665
	11th to 20th	Night	32% 6% 12% 25% 22% 3	2730
	21st to end	Night	33% 6% 11% 24% 21% 5%	2730
December	1st to 10th	Night	25% 5% 10% 19% 34% 7%	4687
	11th to 20th	Night	44% 10% 15% 17% 11% 3	5316
	21st to end	Night	51% 9% 14% 16% 10%	7106

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	16% 14% 23% 26% 17% 3	220
	11th to 20th	Day	8% 11% 20% 26% 27% 8%	220
	21st to end	Day	9% 5% 21% 35% 22% 8%	286
February	1st to 10th	Day	9% 10% 25% 34% 17% 5%	485
	11th to 20th	Day	10% 12% 29% 34% 14% 1	535
	21st to end	Day	10% 14% 30% 30% 14% 1	446
March	1st to 10th	Day	13% 16% 27% 29% 13% 2	540
	11th to 20th	Day	9% 19% 28% 25% 17% 2	540
	21st to end	Day	11% 16% 33% 27% 11% 2	594
April	1st to 10th	Day	11% 17% 24% 25% 17% 5%	540
	11th to 20th	Day	10% 19% 30% 24% 12% 4	532
	21st to end	Day	12% 14% 25% 27% 17% 5%	540
May	1st to 10th	Day	8% 19% 29% 24% 15% 5%	543
	11th to 20th	Day	12% 15% 28% 25% 15% 5%	568
	21st to end	Day	10% 12% 21% 28% 21% 7%	617
June	1st to 10th	Day	4 14% 25% 31% 19% 6%	570
	11th to 20th	Day	7% 16% 26% 31% 16% 5%	570
	21st to end	Day	4 10% 23% 34% 24% 7%	570
July	1st to 10th	Day	2 5% 26% 35% 26% 6%	566
	11th to 20th	Day	1 4 22% 39% 26% 7%	564
	21st to end	Day	2 4 20% 38% 26% 10%	619
August	1st to 10th	Day	4 4 22% 35% 26% 11%	567
	11th to 20th	Day	3 3 21% 33% 28% 11%	557
	21st to end	Day	3 5% 22% 34% 26% 10%	620
September	1st to 10th	Day	2 5% 21% 31% 29% 13%	530
	11th to 20th	Day	5% 8% 22% 30% 26% 9%	530
	21st to end	Day	4 6% 22% 30% 27% 9%	530
October	1st to 10th	Day	6% 11% 21% 27% 28% 7%	530
	11th to 20th	Day	6% 11% 19% 29% 29% 6%	530
	21st to end	Day	8% 9% 21% 28% 26% 7%	363
November	1st to 10th	Day	12% 11% 23% 24% 25% 6%	330
	11th to 20th	Day	6% 8% 25% 32% 23% 6%	330
	21st to end	Day	7% 8% 22% 32% 25% 5%	330
December	1st to 10th	Day	11% 6% 21% 31% 20% 12%	225
	11th to 20th	Day	15% 9% 20% 26% 23% 7%	220
	21st to end	Day	21% 11% 17% 28% 20% 3	242
January	1st to 10th	Night	10% 9% 19% 35% 21% 6%	840
	11th to 20th	Night	9% 7% 16% 40% 23% 5%	840
	21st to end	Night	12% 5% 16% 38% 24% 5%	924
February	1st to 10th	Night	11% 6% 19% 40% 22% 3	840
	11th to 20th	Night	9% 7% 21% 43% 18% 2	824
	21st to end	Night	9% 10% 21% 42% 16% 2	692
March	1st to 10th	Night	11% 8% 23% 39% 18% 2	840
	11th to 20th	Night	8% 9% 20% 39% 23% 2	840
	21st to end	Night	11% 9% 23% 40% 14% 2	924
April	1st to 10th	Night	10% 10% 20% 36% 21% 2	840
	11th to 20th	Night	10% 10% 22% 37% 17% 4	831
	21st to end	Night	9% 7% 23% 36% 22% 3	725
May	1st to 10th	Night	9% 11% 23% 35% 21% 2	630
	11th to 20th	Night	10% 6% 19% 38% 24% 4	557
	21st to end	Night	9% 7% 15% 37% 27% 5%	455
June	1st to 10th	Night	7% 6% 18% 36% 29% 4	420
	11th to 20th	Night	5% 5% 20% 41% 26% 2	420
	21st to end	Night	3 3 15% 49% 27% 2	420
July	1st to 10th	Night	2 1 13% 48% 33% 3	410
	11th to 20th	Night	3 1 8% 52% 34% 2	408
	21st to end	Night	3 2 7% 49% 37% 2	460
August	1st to 10th	Night	5% 2 8% 52% 30% 3	533
	11th to 20th	Night	2 3 8% 41% 40% 5%	823
	21st to end	Night	4 2 9% 42% 38% 5%	916
September	1st to 10th	Night	4 3 8% 40% 38% 8%	800
	11th to 20th	Night	4 4 9% 36% 37% 11%	800
	21st to end	Night	5% 3 10% 39% 33% 11%	800
October	1st to 10th	Night	8% 3 12% 38% 34% 6%	800
	11th to 20th	Night	7% 5% 13% 36% 32% 7%	800
	21st to end	Night	6% 5% 15% 39% 27% 8%	880
November	1st to 10th	Night	9% 5% 17% 35% 28% 6%	820
	11th to 20th	Night	9% 6% 17% 43% 21% 3	840
	21st to end	Night	9% 5% 18% 37% 26% 5%	840
December	1st to 10th	Night	12% 5% 17% 40% 21% 5%	840
	11th to 20th	Night	14% 8% 17% 39% 19% 3	840
	21st to end	Night	19% 8% 22% 35% 14% 2	924

Page generated at 2026-08-27 01:07:15. Version ac07

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