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 2025-04-26.

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	4 5% 2 5% 4 4 4 3 5% 7% 57%	117351
	Night	4 6% 2 6% 4 4 4 4 5% 7% 53%	120066
Transparency	Day	26% 6% 9% 17% 22% 20%	117092
	Night	30% 7% 10% 18% 21% 15%	119915
Seeing	Day	8% 11% 24% 30% 21% 6%	15303
	Night	9% 6% 16% 39% 26% 5%	24806

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 11% 4 9% 7% 6% 7% 5% 8% 9% 30%	3639
	11th to 20th	Day	5% 8% 3 7% 6% 5% 5% 4 6% 8% 44%	3640
	21st to end	Day	5% 10% 3 8% 6% 7% 6% 5% 6% 7% 37%	4111
February	1st to 10th	Day	5% 8% 3 7% 7% 5% 6% 6% 8% 10% 36%	1900
	11th to 20th	Day	3 8% 3 7% 6% 6% 6% 5% 9% 10% 37%	1950
	21st to end	Day	3 8% 3 8% 5% 6% 5% 5% 7% 10% 40%	1650
March	1st to 10th	Day	5% 13% 3 9% 6% 6% 5% 4 5% 9% 34%	4518
	11th to 20th	Day	2 6% 2 6% 5% 5% 6% 5% 8% 12% 41%	4665
	21st to end	Day	3 7% 3 8% 6% 6% 6% 5% 7% 9% 40%	5959
April	1st to 10th	Day	6% 10% 3 7% 5% 5% 5% 4 7% 10% 40%	2400
	11th to 20th	Day	5% 8% 2 6% 5% 5% 4 4 6% 8% 48%	2369
	21st to end	Day	7% 6% 2 6% 4 4 4 3 6% 9% 50%	2447
May	1st to 10th	Day	4 8% 2 5% 4 3 4 4 5% 8% 54%	4110
	11th to 20th	Day	4 3 1 3 2 3 2 3 5% 5% 69%	4161
	21st to end	Day	4 4 1 4 4 3 4 3 5% 6% 62%	4813
June	1st to 10th	Day	5% 4 1 5% 4 3 4 3 5% 7% 58%	2660
	11th to 20th	Day	4 3 1 3 3 2 2 3 4 6% 69%	2660
	21st to end	Day	2 2 1 3 2 2 3 2 3 5% 75%	2660
July	1st to 10th	Day	1 1 1 1 1 2 2 3 3 86%	4420
	11th to 20th	Day	1 1 1 2 2 2 3 3 4 5% 77%	4420
	21st to end	Day	2 2 1 3 3 3 3 3 4 6% 72%	4790
August	1st to 10th	Day	3 2 1 3 2 3 2 2 4 6% 72%	4222
	11th to 20th	Day	1 1 1 1 2 1 2 3 4 85%	3729
	21st to end	Day	2 2 2 2 2 2 2 2 3 81%	4180
September	1st to 10th	Day	1 1 1 2 2 1 2 1 3 4 82%	2280
	11th to 20th	Day	2 2 1 3 2 3 3 3 4 5% 72%	2156
	21st to end	Day	2 3 1 3 1 2 3 2 4 5% 73%	2090
October	1st to 10th	Day	3 3 1 3 2 3 2 2 4 6% 72%	3464
	11th to 20th	Day	7% 4 1 3 2 2 2 2 4 5% 68%	3161
	21st to end	Day	2 3 1 4 4 4 4 4 6% 10% 57%	3101
November	1st to 10th	Day	5% 9% 2 5% 4 4 4 4 5% 7% 51%	1764
	11th to 20th	Day	6% 6% 2 5% 5% 4 5% 4 8% 10% 47%	1800
	21st to end	Day	4 7% 3 7% 4 4 5% 4 7% 6% 48%	1800
December	1st to 10th	Day	3 5% 2 5% 4 3 4 3 4 7% 60%	2630
	11th to 20th	Day	6% 10% 3 9% 7% 7% 8% 6% 7% 9% 28%	3028
	21st to end	Day	4 9% 4 8% 7% 7% 7% 5% 7% 11% 31%	4004
January	1st to 10th	Night	4 11% 4 9% 6% 5% 6% 6% 8% 9% 33%	6306
	11th to 20th	Night	5% 8% 3 9% 6% 6% 5% 4 5% 5% 46%	6320
	21st to end	Night	6% 10% 3 7% 6% 5% 6% 5% 6% 6% 41%	6847
February	1st to 10th	Night	4 9% 3 8% 5% 4 6% 5% 7% 8% 41%	2499
	11th to 20th	Night	4 8% 3 7% 6% 5% 5% 4 7% 10% 42%	2338
	21st to end	Night	3 9% 3 9% 6% 5% 6% 5% 7% 8% 39%	1980
March	1st to 10th	Night	6% 13% 4 9% 5% 4 4 4 6% 7% 37%	5376
	11th to 20th	Night	3 7% 2 7% 6% 5% 5% 4 6% 9% 46%	5322
	21st to end	Night	4 7% 2 8% 6% 5% 6% 4 7% 8% 40%	5013
April	1st to 10th	Night	6% 7% 3 6% 6% 5% 4 5% 6% 8% 45%	2000
	11th to 20th	Night	4 7% 3 5% 4 3 4 3 5% 8% 53%	1979
	21st to end	Night	7% 6% 2 6% 4 4 3 4 4 6% 54%	1849
May	1st to 10th	Night	6% 6% 2 5% 3 3 4 3 5% 6% 58%	2860
	11th to 20th	Night	3 3 1 3 3 3 3 3 3 7% 68%	2723
	21st to end	Night	5% 5% 2 5% 3 3 4 3 5% 6% 59%	2762
June	1st to 10th	Night	5% 4 2 5% 4 3 5% 4 6% 6% 56%	1520
	11th to 20th	Night	5% 2 1 3 3 4 4 2 4 5% 66%	1520
	21st to end	Night	2 2 1 2 3 3 4 3 4 6% 72%	1520
July	1st to 10th	Night	1 1 2 2 1 2 2 4 4 81%	2540
	11th to 20th	Night	3 2 1 3 3 3 3 3 4 5% 70%	2540
	21st to end	Night	1 3 1 3 3 3 4 4 6% 6% 65%	2761
August	1st to 10th	Night	3 2 1 4 3 3 4 3 5% 6% 66%	2710
	11th to 20th	Night	2 2 1 2 2 2 3 2 3 4 79%	3117
	21st to end	Night	4 2 1 2 2 2 1 1 2 3 80%	3498
September	1st to 10th	Night	3 2 1 3 2 1 2 1 3 5% 77%	1900
	11th to 20th	Night	3 4 1 4 2 3 3 3 4 5% 69%	2023
	21st to end	Night	3 2 1 3 2 2 2 2 4 5% 74%	2090
October	1st to 10th	Night	3 2 1 3 3 2 3 2 3 4 74%	3511
	11th to 20th	Night	2 3 1 4 2 2 3 3 4 5% 71%	3777
	21st to end	Night	4 4 1 4 3 4 4 3 6% 8% 60%	4455
November	1st to 10th	Night	6% 7% 3 5% 5% 4 5% 4 6% 7% 49%	2535
	11th to 20th	Night	6% 6% 2 6% 5% 4 4 4 5% 7% 50%	2600
	21st to end	Night	5% 6% 3 7% 5% 4 5% 4 6% 8% 48%	2600
December	1st to 10th	Night	4 5% 2 5% 4 3 3 3 4 6% 60%	4547
	11th to 20th	Night	5% 9% 4 9% 6% 6% 7% 5% 7% 10% 32%	5176
	21st to end	Night	6% 11% 4 11% 7% 7% 6% 5% 7% 7% 28%	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	45% 13% 17% 16% 9%	3639
	11th to 20th	Day	35% 9% 15% 22% 17% 2	3640
	21st to end	Day	43% 8% 14% 8% 20% 7%	4111
February	1st to 10th	Day	39% 8% 17% 23% 10% 2	1900
	11th to 20th	Day	38% 10% 15% 24% 12% 1	1960
	21st to end	Day	34% 11% 18% 25% 10% 4	1650
March	1st to 10th	Day	45% 8% 10% 23% 10% 4	4518
	11th to 20th	Day	29% 9% 19% 26% 17% 1	4665
	21st to end	Day	37% 10% 14% 21% 15% 3	5959
April	1st to 10th	Day	39% 6% 13% 23% 15% 4	2400
	11th to 20th	Day	32% 8% 10% 23% 20% 6%	2372
	21st to end	Day	31% 6% 12% 27% 20% 4	2447
May	1st to 10th	Day	25% 8% 8% 28% 25% 7%	4110
	11th to 20th	Day	18% 4 6% 17% 39% 15%	4164
	21st to end	Day	23% 6% 7% 23% 37% 5%	4814
June	1st to 10th	Day	25% 7% 8% 20% 30% 11%	2660
	11th to 20th	Day	18% 3 6% 17% 31% 24%	2660
	21st to end	Day	13% 3 3 12% 30% 39%	2660
July	1st to 10th	Day	6% 2 2 5% 14% 71%	4351
	11th to 20th	Day	10% 3 3 4 18% 63%	4345
	21st to end	Day	13% 4 4 7% 27% 46%	4639
August	1st to 10th	Day	15% 3 3 6% 20% 53%	4206
	11th to 20th	Day	7% 2 2 5% 23% 61%	3765
	21st to end	Day	10% 2 2 8% 33% 45%	4179
September	1st to 10th	Day	10% 2 2 8% 29% 50%	2280
	11th to 20th	Day	15% 4 5% 14% 31% 31%	2156
	21st to end	Day	16% 3 3 18% 31% 29%	2090
October	1st to 10th	Day	16% 3 5% 11% 34% 32%	3464
	11th to 20th	Day	20% 3 3 20% 42% 12%	3161
	21st to end	Day	21% 7% 9% 28% 24% 10%	3101
November	1st to 10th	Day	34% 7% 10% 22% 22% 6%	1764
	11th to 20th	Day	31% 7% 13% 30% 17% 2	1800
	21st to end	Day	36% 7% 13% 24% 18% 3	1800
December	1st to 10th	Day	25% 5% 9% 21% 35% 5%	2630
	11th to 20th	Day	49% 10% 13% 17% 10% 1	3028
	21st to end	Day	43% 12% 16% 22% 7%	4004
January	1st to 10th	Night	43% 13% 16% 20% 8%	6306
	11th to 20th	Night	37% 8% 13% 19% 19% 3	6320
	21st to end	Night	38% 7% 15% 11% 23% 6%	6847
February	1st to 10th	Night	38% 7% 18% 23% 12% 3	2499
	11th to 20th	Night	37% 6% 16% 26% 13% 2	2339
	21st to end	Night	38% 8% 14% 22% 11% 5%	1980
March	1st to 10th	Night	42% 8% 10% 20% 14% 7%	5376
	11th to 20th	Night	31% 9% 13% 27% 19% 1	5322
	21st to end	Night	37% 11% 18% 22% 11% 1	5013
April	1st to 10th	Night	35% 7% 14% 24% 16% 4	2000
	11th to 20th	Night	29% 7% 12% 27% 18% 8%	1979
	21st to end	Night	31% 5% 12% 24% 23% 4	1849
May	1st to 10th	Night	24% 7% 7% 29% 25% 8%	2860
	11th to 20th	Night	18% 5% 5% 16% 42% 14%	2724
	21st to end	Night	25% 6% 6% 22% 36% 5%	2762
June	1st to 10th	Night	28% 6% 7% 23% 26% 9%	1520
	11th to 20th	Night	20% 5% 6% 16% 36% 18%	1520
	21st to end	Night	14% 4 4 12% 29% 38%	1520
July	1st to 10th	Night	9% 2 2 5% 14% 68%	2500
	11th to 20th	Night	16% 3 2 4 15% 60%	2492
	21st to end	Night	16% 6% 4 7% 24% 42%	2674
August	1st to 10th	Night	19% 4 3 7% 17% 51%	2702
	11th to 20th	Night	11% 3 2 5% 21% 58%	3147
	21st to end	Night	13% 2 2 7% 29% 48%	3498
September	1st to 10th	Night	14% 2 3 6% 26% 50%	1900
	11th to 20th	Night	18% 4 4 14% 26% 34%	2023
	21st to end	Night	14% 3 5% 16% 29% 34%	2090
October	1st to 10th	Night	16% 3 3 12% 30% 35%	3511
	11th to 20th	Night	16% 4 4 19% 39% 18%	3777
	21st to end	Night	22% 5% 6% 26% 30% 11%	4455
November	1st to 10th	Night	33% 7% 11% 20% 22% 8%	2535
	11th to 20th	Night	32% 6% 12% 25% 23% 3	2600
	21st to end	Night	34% 6% 11% 23% 21% 5%	2600
December	1st to 10th	Night	25% 5% 10% 19% 34% 7%	4547
	11th to 20th	Night	44% 11% 15% 17% 11% 2	5176
	21st to end	Night	51% 9% 14% 16% 9%	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	18% 13% 23% 27% 17% 4	200
	11th to 20th	Day	9% 12% 22% 28% 24% 6%	200
	21st to end	Day	10% 5% 22% 33% 22% 8%	262
February	1st to 10th	Day	10% 10% 26% 34% 15% 5%	450
	11th to 20th	Day	11% 13% 27% 34% 15% 1	495
	21st to end	Day	9% 14% 30% 30% 15% 1	414
March	1st to 10th	Day	12% 17% 26% 29% 14% 2	500
	11th to 20th	Day	9% 19% 28% 25% 17% 2	500
	21st to end	Day	11% 17% 33% 26% 11% 2	550
April	1st to 10th	Day	12% 18% 25% 24% 17% 4	500
	11th to 20th	Day	11% 19% 31% 23% 12% 4	492
	21st to end	Day	12% 16% 24% 27% 17% 4	481
May	1st to 10th	Day	8% 21% 30% 23% 13% 4	463
	11th to 20th	Day	13% 14% 27% 24% 16% 5%	488
	21st to end	Day	11% 12% 21% 27% 22% 7%	529
June	1st to 10th	Day	4 15% 24% 30% 20% 7%	490
	11th to 20th	Day	8% 17% 27% 30% 14% 4	490
	21st to end	Day	3 10% 25% 32% 23% 7%	490
July	1st to 10th	Day	2 5% 26% 36% 26% 6%	486
	11th to 20th	Day	1 4 24% 38% 25% 7%	484
	21st to end	Day	2 4 20% 41% 24% 9%	531
August	1st to 10th	Day	5% 4 21% 34% 27% 9%	487
	11th to 20th	Day	3 3 22% 33% 28% 10%	477
	21st to end	Day	2 6% 22% 34% 26% 9%	539
September	1st to 10th	Day	2 5% 21% 31% 29% 12%	490
	11th to 20th	Day	6% 8% 23% 29% 26% 9%	490
	21st to end	Day	4 7% 24% 29% 27% 9%	490
October	1st to 10th	Day	6% 12% 20% 26% 29% 8%	490
	11th to 20th	Day	6% 11% 18% 28% 30% 6%	490
	21st to end	Day	8% 9% 22% 29% 25% 7%	330
November	1st to 10th	Day	12% 11% 23% 24% 24% 6%	300
	11th to 20th	Day	6% 8% 26% 30% 24% 6%	300
	21st to end	Day	7% 9% 21% 31% 25% 6%	300
December	1st to 10th	Day	12% 6% 20% 30% 20% 12%	205
	11th to 20th	Day	14% 8% 22% 27% 24% 6%	200
	21st to end	Day	21% 9% 16% 30% 21% 3	220
January	1st to 10th	Night	10% 9% 19% 35% 21% 6%	800
	11th to 20th	Night	9% 8% 17% 40% 22% 5%	800
	21st to end	Night	13% 5% 16% 36% 24% 5%	880
February	1st to 10th	Night	11% 6% 19% 40% 21% 3	800
	11th to 20th	Night	9% 7% 20% 43% 18% 2	784
	21st to end	Night	8% 10% 21% 42% 17% 2	660
March	1st to 10th	Night	11% 8% 22% 39% 18% 2	800
	11th to 20th	Night	8% 10% 19% 38% 23% 2	800
	21st to end	Night	12% 10% 22% 39% 15% 2	880
April	1st to 10th	Night	10% 11% 21% 36% 21% 2	800
	11th to 20th	Night	9% 10% 22% 36% 18% 5%	791
	21st to end	Night	9% 7% 22% 36% 22% 3	677
May	1st to 10th	Night	9% 12% 23% 34% 21% 2	570
	11th to 20th	Night	9% 6% 19% 36% 25% 4	503
	21st to end	Night	9% 8% 15% 35% 28% 5%	411
June	1st to 10th	Night	7% 6% 18% 34% 30% 5%	380
	11th to 20th	Night	6% 6% 21% 39% 27% 3	380
	21st to end	Night	4 3 14% 47% 29% 3	380
July	1st to 10th	Night	2 2 12% 46% 35% 3	370
	11th to 20th	Night	3 1 9% 49% 36% 2	368
	21st to end	Night	2 2 6% 49% 38% 2	416
August	1st to 10th	Night	6% 3 8% 49% 31% 3	481
	11th to 20th	Night	2 3 9% 40% 41% 5%	743
	21st to end	Night	3 2 9% 41% 40% 5%	836
September	1st to 10th	Night	4 3 7% 39% 39% 9%	760
	11th to 20th	Night	4 4 10% 35% 36% 11%	760
	21st to end	Night	5% 3 10% 38% 32% 12%	760
October	1st to 10th	Night	7% 3 12% 38% 34% 6%	760
	11th to 20th	Night	7% 5% 12% 36% 34% 7%	760
	21st to end	Night	6% 5% 15% 38% 27% 8%	836
November	1st to 10th	Night	9% 5% 17% 35% 28% 6%	780
	11th to 20th	Night	9% 6% 17% 43% 21% 4	800
	21st to end	Night	9% 5% 18% 36% 26% 5%	800
December	1st to 10th	Night	12% 5% 16% 39% 22% 6%	800
	11th to 20th	Night	14% 8% 18% 39% 19% 3	800
	21st to end	Night	19% 7% 22% 36% 14% 2	880

Page generated at 2025-04-23 06:25:05. Version ac07

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